NC0061204_authorization to construct_20030303

State of North Carolina
Department of Environment •
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor ®�
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
NR
March 3,2003
Mr. Thomas M. Alphin
Scarlet Acres Mobile Home Subdivision
P.O. Box 354812
Palm Coast, Florida 32135
Subject: Authorization to Construct
ATC No. 061204A01
Scarlet Acres MHP WWTP
Forsyth County
Dear Mr. Alphin:
The Division of Water Quality's NPDES Unit has reviewed your request for an Authorization to
Construct improvements at the Scarlet Acres MHP WWTP and has considered additional
information regarding the project provided by Mr. B.K. Barringer on your behalf.
The Division finds the proposed improvements and design to be satisfactory and hereby grants
authorization for the following:
• installation of an aerated bar screen in the existing equalization tank;
• replacement of existing airlift piping with new 2" Geyser Pumps, two in the equalization
basin and one in each of the secondary clarifiers;
• installation of bundled, polypropylene fixed media in the existing aeration tanks;and
• all related structures,equipment,piping,controls, and other appurtenances, as
presented in the proposed plans and specifications.
This Authorization to Construct is issued in accordance with NPDES Permit No. NC0061204, issued
July 7, 1999, and shall be subject to revocation unless the wastewater treatment facilities are
constructed in accordance with the conditions and limitations specified in that permit and this ATC.
Upon completion of construction and submittal of an acceptable Engineer's Certification(see below),
the approved design capacity of the facility shall remain at 0.02 MGD.
Special Provisions
In the event that the facilities fail to perform satisfactorily,including the creation of nuisance
conditions, the Permittee shall take immediate corrective action, including those as may be required
by this Division, such as the construction of additional or replacement wastewater treatment or
disposal facilities.
Notification Requirements
The Permittee shall notify the Winston-Salem Regional Office, telephone number [phone], at
least forty-eight(48) hours in advance of operation of the installed facilities, so that an in-place
inspection can be made. Such notification to the regional supervisor shall be made during the
normal office hours of 8:00 a.m. until 5:00 p.m. on Monday through Friday,excluding State
Holidays.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone[phone] FAX[phone]
An Equal Opportunity Affirmative Action Employer On the Internet at http:Hh2o.enr.state.nr,usIN P DES

4
ATC No. 061204A01
Scarlet Acres MHP WWTP
Engineering Certification
Upon completion of construction and prior to operation of the modified facility, the Permittee shall
provide the Division with a certification from a professional engineer registered in North Carolina
certifying that the permitted facility has been installed in accordance with the NPDES Permit, this
Authorization to Construct, and the approved plans and specifications. The certification should be
mailed to the NPDES Unit, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
ORC Requirements
The Permittee must continue to employ a certified wastewater treatment plant operator in
responsible charge (ORC) of the wastewater treatment facilities. The operator must hold a certificate
of the type and grade at least equivalent to or greater than the classification assigned to the
wastewater treatment facilities by the Certification Commission. The Permittee must also employ a
certified back-up operator of the appropriate type and grade to comply with the conditions of Title
15A, Chapter 8G, .0200. The ORC of a facility must visit the facility at least weekly(Class I) or at
least daily, excluding weekends and holidays (Class II,III,and IV); and must properly manage and
document daily operation and maintenance of the facility and comply with all other conditions of
Title 15A,Chapter SG, .0200.
Additional Conditions
The Operational Agreement between the Permittee and the Environmental Management
Commission is incorporated herein by reference and is a condition of this Permit. Noncompliance
with the terms of the Operational Agreement shall subject the Permittee to all sanctions provided by
G. S. 143-215.6 for violation of or failure to act in accordance with the terms and conditions of this
Permit.
Failure to abide by the requirements contained in this Authorization to Construct may subject the
Permittee to an enforcement action by the Division of Water Quality in accordance with North
Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not relieve the Permittee from its responsibility
to comply with any and all statutes, rules, regulations, or ordinances that may be imposed by other
government agencies (local,state, and federal)which have jurisdiction.
The Permittee shall maintain a copy of the approved plans and specifications on file for the life of
the facility.
If you have any questions about this Authorization to Construct, please contact Mike Templeton,at
[phone], extension 541.
Sincerely,
ur Alan W. Klimek, P.E.
Enclosures: Engineer's Certification Form
Copies: Mc B.K. Barringer,P.E. (w/ enclosure) - Piedmont Design Associates
125 East Plaza Drive,Suite 104
Mooresville,NC 28115
Winston-Salem Regional Office,Water Quality
Technical Assistance and Certification Unit
Central Files
(NPDES Unit Files

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ATC SUMMARY
Scarlet Acres Mobile Home Subdivision
Scarlet Acres MHP WWTP
ATC No. 061204A01
UT Mill Creek, Class C
Yadkin-Pee Dee River Basin
Forsyth County
SCOPE
Scarlet Acres Mobile Home Subdivision proposes to modify the existing 0.040 MGD Scarlet Acres MHP
WWTP to improve overall plant performance.
RECOMMENDATIONS
1. Approve the ATC request, received November 22, 2002.
2. Condition the Authorization upon its acceptable performance (standard ATC language).
PROTECT DESCRIPTION
The proposed improvements consist of:
• installation of an aerated bar screen in the existing equalization tank;
• replacement of existing airlift piping with new 2" Geyser Pumps, two in the equalization
basin and one in each of the secondary clarifiers;
• installation of bundled, polypropylene fixed media in the existing aeration tanks; and
• all related structures,equipment, piping,controls, and other appurtenances, as presented in
the proposed plans and specifications.
The main issue at the plant has been a recent series of toxicity violations, which prompted penalities
from DWQ. It appears that the violations were caused by chemicals from a suspected drug lab within
the MHP.The permittee brought in law enforcement officials to handle the matter; no arrests were
made,but toxicity has not been a problem at the WWTP since then.
The plant has not had any other significant performance or compliance problems. The permittee is
undertaking this project to ensure that the plant is performing optimally and that he will not face
additional enforcement actions.
REVIEW SUMMARY
Teresa Rodriguez reviewed the original submittal and requested additional information. When Teresa
left,she forwarded the project to Mike Templeton for completion.
Once it became clear that the toxicity problem is not related to the operation of the plant, the nature of
the project and our review changed. Rather than being a corrective action to produce an effluent of
such-and-such quality, the project is a voluntary effort to simply enhance the plant's performance. The
plant is already in compliance, so nearly anv improvement meets the limited objective of the project
and requires much less scrutiny from the Division in the design review.
The submittal does not estimate the effects of the project on effluent quality or provide any information
to document the effects of similar retrofits. Still, the proposed improvements may very well enhance
performance. In any event,standard ATC language already conditions the approval on acceptable
performance,so that the permittee is required to correct the situation if the results are not acceptable.
Technical comments and concerns were minor and were not addressed further during the review.
- end of summary-
I�\�, 3�3I°3
- 1 -

1,0/03/2002 THO 15:55 PAX 704 664 1778 PIEDNONP DESIGN ASSOC 001./004
PIEDMONT DESIGN ASSOCIATES, P.A.
125 East Plaza Drive, Suite 104 Engineering
Mooresville, NC 28115 Surveying
Telephone[phone] Fax[phone] Planning
Email: oda123Ct?o alitel.net
October 3, 2002
NCDENR— DWQ
1617 Mail Service Center
Raleigh, NC 27699
Attn: Teresa Rodriguez
Fax: [phone]
RE: Dr. Sam Kondo
O —Visa Requirements
Dear Ms. Rodriguez:
For your information, Dr. Sam Kondo is in America on an "O Visa". Attached are the published
requirements for a non-citizen to obtain this status.
Dr. Kondo's technology is unique to us here. If there is anything that I can do to assist your
department in recognition of this, and in processing projects that utilize his technology and
products, please advise me.
Your attention to these matters is appreciated. Please contact me if you have any questions.
Yours truly,
PIED ONT DE GN ASSOCIATES, PA
am B.K. Ba nger, Jr., PE
Chairman of the Board
NC Registration No.: 3370
attachments

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SEP-09-2002 MON 11 :38 AM ON-SITEWASTEWATER 919 715 3227 P. 01
�o —Tr 2EsA 9-0006�,Ez
ABONS Innovative Approval Request Problems as noted by Joe Pearce 11/28/01
• Wake Forest Experimental Test Facility
• Chain of Custodies indicate the vendor took the majority of the samples. The
laboratory chooses not to provide any clarification.
• No control panels or alarms installed.
• PVC air lines were not properly installed.
• TS-11 blower was not consistent with approval blower model.
• Solids in wastewater were settling in the Feed Tank.
• Screened wastewater not consistent with domestic wastewater.
• Used 2 geyser pumps to lift out of septic instead of 1 prescribed in approval
request.
• Repairs were made to the system without prior notification to the researcher or
DENR. Page 3 of the experimental report "Samples were not collected from this
system on March 2 and April 9 because the system was shut down to repair
problems with the aeration pipe(broken pipe and loose fitting, respectively)."
• Carroll Residence
• An additional blower was added to the system without prior notification to the
researcher, DENR or the local health department.
• Sampling was intentionally halted without approval of DENR or the County
Health Department during the period the system was functioning incorrectly
• Aeration piping was not properly installed,
• Aeration valves are rusting, and `Lvcak"vinyl tubing was installed,
• The vendor signed a contract to act as the operations firm, and failed to provide
the required operational reports and laboratory data to the County Health
Department.
• Serenity Care Nursing Home
• Data is for a system which has a greater design flow than requested.
• The data is for a system without DENR approval.
• One data point is of minimal use.
Churchland Elementary School
• The system is not the same as either system for which approval is requested.
• The data does not indicate if the effluent was sampled prior to or after the
sandfilter.
• Sidar Residence
• This residential system was installed as a repair and perrrutted locally under the
"best professional judgment" repair regulation.
• It appears this system used garden hose for aeration tubing. Garden hose is not
rated for this application, and is not a reasonable material. Photo is provided on
The following page.

SEP-09-2002 MON 11 :38 AM ON-SITEWASTEWATER 919 715 3227 P. 02
l
f
•
• Design Problems
• The aeration system is permanently mounted in the bottom of the tanks,and is inaccessible for
mpair. To my knowledge,all ATUs approved,and all extended aeration package plants approved
to date by DENR-DlrH have removable diffusers. The permanent attachment of the diffusers
should not be considered an intrinsic design improvement,but in my opinion is a significant
design flaw.
• The aeration system does not contain check valves,and will allow wastewater to enter the system
each time the blower is disabled. With time the aeration system will clog. To my knowledge,all
ATU's approved and all package plants have either air-lift aeration,or diffusers that act as cheek
valves. The lack of a water check mechanism should not be considered an intrinsic design
improvement,but in my opinion is a significant design flaw.
• The tanks have not been shown to meet the minimum physical properties for ATU tanks: ultimate
tensile strength,flexural strength,flexural modulus of elasticity,or minimum wall thickness.
Initial design testing resulted in crushed tanks. Reinforcement with ribs Improved the strength
such that the tanks would pass the vacuum strength test;however,the silicone sealant between,the
bottom section and the ring section failed to maintain the seal on some tanks. The vendor did not
have vacuum testing equipment,and had to use DENR equipment for the tests.
• The vendor does not appear to have an aeration piping system built of materials suitable for the
application.
• The syatcrn is not designed with simple controls to allow simple operation. At the Wake Forest
site,the vendor stated "Only special people can tell what is going on'. In my opinion,the system
controls must be easily understandable by operators within the current wastewater certification
program. Of specific concern,the air pressure to the pumps and diffusers control the feed rates,
the return rates,and the aeration. A change to anyone valve,changes the pressure throughout the
system and changos all other variable process points.

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PIEDMONT DESIGN ASSOCIATES, P.A.
125 East Plaza Drive, Suite 104 Engineering
Mooresville, NC 28115 Surveying
Telephone[phone] Fax[phone] Planning
Email: pda123(cDalltel.net
August 23, 2002
NCDENR — NPDES Unit
Department of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Attn: Ms. Teresa Rodriguez
RE: Scarlet Acres Mobile Home Park WWTP
' 5528 Sherene Lane
Walkertown, Forsyth County, NC
NPDES ID#: NC 0061204
Dear Ms. Rodriguez:
Attached is additional information, which should be included in the submittal package for the
referenced project dated July 3, 2002.
Please review and issue an Authorization to Construct to upgrade this facility. Contact us if
there are any questions. Your prompt response to this matter is appreciated.
Yours truly,
PIEDMW DE S N SOCIATES, P
B.K. Barringer, Jr., PE
NC Registration No.: 3370
Chairman of the Board
cc: Dr. Sam Kondo — NCA2 BioProcess, Inc.
Tommy Alphin — Scarlet Acres MHP
attachments

08/21/2002 15:34 3864458768 TOM ALPHIN PAGE ,01
August 21, 2002
RE: Scarlet Acres Mobile Home Park YWNTP
5528 Sherene Lane
Walkertown, NC 27051
To Whore it May Concern:
Please be advised that we have employed the services of NCM Bio-Process, Inc and Piedmont
Design Associates, PA to design and install components intendeo to improve the performance
of this existing wastewater treatment plant. A full description of the components and scope of
work to be performed is outlined in the Engineers Report on Modification for the referenced
facility.
Please contact us if you would like to discuss or if there are any questions.
Yours truly,
SCARLET ACRES MOBILE
PARK
Tommy�wner
PO Box 354812
Palm Coast, FL 32135
..... .....��.. •vmm�a�J olrt goo and SY4 CC:SIi n3r X0o2/TL/84

CONSTRUCTION SEQUENCE
• The system will remain in operation during the upfit.
• Install aeration screen in the existing flow equalization tank, connect to air lines. (Time
required: 2 hours)
• Replace air lift piping in each clarifier with a 2" geyser pump. (Time required: 1 hour)
• Replace air piping and install fixed media in aeration chamber. Stop air flow in one chamber
ata time. (Time required per chamber: 2 hours)
• All work should be complete in less than one day.

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i a A g I g HMSOnS 2002 WWTP MODIFICATIONS 'R°°"•`° `°• PIEDMONT DESIGN
N a S TOMMY ALPHIN
_ SCARLET ACRES MOBILE HOME PARK ® Associates, P.A.
8 o PO BOX 354812
g 5528 SHERENE LANE ALM COAST, FLORIDA 32135 smmlo w:,reiac�� ise� r��d
I WALKERTOWN, FORSYTH Co., NORTH CAROLINA [phone] P„oM, „Rbe. ,,,e

Division of Water QuaCity
MEMO_From' r�iO Date
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North Carolina Department of Environment and Natural Resources
585 Waughtown Street, Winston-Salem, NC 27107
Telephone [phone]

j
Engineers Report on Modification
to the Existing WWTP for
Scarlet Acres Mobile Home Park
Wastewater Treatment Plant
5528 Sherene Lane
Walkertown, Forsyth County, MC
June 25, 2002
NP®ES PERMIT #0061204
ENGINEER: OWNER:
Piedmont Design Associates,P.A. Tommy Alphin
Suite 104,Westfield Center P.O. Box 354812,
125 East Plaza Drive, Palm Coast, Florida 32135
Mooresville,NC 28115 Tel: [phone]
Tel: [phone] Mobile: [phone]
Fax: [phone]
CONTRACTOR:
NCA2 BioProcess,Inc. /
504 North Layton Avenue
P.O. Box 986
Dunn,NC 28335
Tel: [phone]
Fax: [phone] �15<1 0

INTRODUCTION
The Scarlet Acres Mobile Home Park established in 1985, is served by a 20,000 GPD extended aeration
WWTP, which receives and treats sanitary sewer from 69 mobile home units. The Operator has
expressed continuous problems maintaining discharge limits due to various reasons including flow
variations,waste strength spikes and other causes common to extended aeration WWTP.
In an effort to correct the problem and improve the effluent quality, the owner contacted Dr. Masao S.
Kondo with NCA2 BioProcess, Inc. to modify the plant with the addition of an aerated screen, Geyser
pumps-as_flow equalization pumps, fixed media in the aeration chamber and Geyser Pump in the
clarifier.
This report outlines the modification to the treatment system.
RECOMMENDATIONS
The contractor recommended that the extended aeration plant he retrofitted with components to
improve the environment for friendly aerobic bacteria and allow additional settling time in the plant
clarifier.
SECTION 1
SYTEM OVERVIEW
The Scarlet Acres Mobile Home Park Wastewater treatment plan comprised of the following
elements:
- Aerated screen Lam— r0u'
- Flow Equalization Tank
- Submerged fixed media system
- Clarifier
- Sludge holding tank
- Chlorination system
- Dechlorination system
- Effluent flow monitoring station
Numerical analyses described later indicate that when the flow equalization system is properly
operated and if the extended aeration system is changed to submerged fixed media system.
the existing aeration tanks and clarifiers will be able to consistently meet discharge limitations.
2

Figure "I presents a process flow diagram of these elements.
I Aerated Flmv Aeralial Clarifier Chlonnnlion U¢hlodnation �.iodng
In11u�1 Screen Egmlliztion Tmk 1 I — I UNI lhril ent
_._. __ T.,k I huge
hm the
MHP
Aeration Clad Her
I Tank2 2
I
I Waste Sludge
I_ _ Sludge
Sup.m. Hdding Tank
Figure 1. Process Flow Diagram of the Scarlet Acres Mobile Home Park WWTP.
A National Pollution Discharge Elimination System (NPDES) Permit issued by the North Carolina
Department of Environment and Natural Resources (NCDENR) dictates required performance of the
WWTP. Scarlet Acres Mobile Home Park's Permit No. is NC0061204. Monitoring requirements and
discharge limitations associated with the Permit are as follows:
Table 1. Monitoring requirements and discharge limitations
Effluent characteristics Discharge Monitoring_
Limitations Re uirements
Measuremen sample camp e
t
monthly Daily Frequency Type Locati
Avg. Max . on
Flow, gpd 20,000 Continuous RecorcT i or E
er
CBODS , mg/1 Apri 1 - October 16 24 wee y Gra E
31)
CBODS , mg Novem er 1 - Marc 30 45 wee fiy
E
31)
TSS, mg 30 4S wee E
NH3-N, mg as N) 12 Wee E
Toter Res ua Ch orine 2 wee E
DissO ve Oxygen, mg./ Wee EU,D
Temperature Dal y ra E
pH, S.U. Wee y Grab U,D
Fecal Co i orm geometric 200 400 weekly Grab E
mean)
Toial Nitrogen, mg Quarter y Gra E
Total Phosphorus, mg Quarterly Gra E
chronic Toxicity Quarter y Grab E
Footnotes:
1. Sample location: E-Effluent, I-Influent
2. Flow rate should be continuously measured.
3. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1.
4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5. Chronic Toxicity (Ceriodaphnia) P/F at 90%;February, May, August,and November
6. "There shall be no discharge of floating solids or visible foam in other than trace amounts.
3

SECTION 2
INFLUENT FLOW TO THE WWTP
Presented below are detailed description of the WWTP system components and instructions on their
operation and maintenance.
Influent flow to the WWTP was monitored by the Flow Monitoring Device and summarized in Table 2
and Figure 2. There are peak flows more than twice a day typically and the peak at night is the largest.
Flow rate is between 5,888 and 15,787 GPD. Peak flow factor (Peak flow rate / average flow rate)
varies from 1.61 to 1.99.
Design flow of the WWTP is 20,000 GPD. Flow to the WWTP averaged approximately 10,456 GPD.
Table 2. Daily flow rate and peak flow factors
Date Daily flow Peak Average Pea Average
rate _flow Flow
GPD GPHI— [GPH
2002 1 2 5,888 4871 245 1.99
2002 1 3 12,464 850 519 1.64
2002/1 4 10, 547 814 439 1.85
2002/1 5 8,679 584 362 1.61
2002, 6 15 ,787 1,277 658 1.94
20021117111,291 756 4701 1.61
200211 8 8, 534 617 356 1. 74
Fbw-i1 rain for one week
1,400
ll0L1200kj --
1,Q00
o , 800m
0
600
400200
- -__�
0
1 25 49 73 97 121 145
Tirre [hrs]
Figure 2. Influent flow fluctuation
4

SECTION 3
AERATED SCREEN
Description
The aerated screen is the first components of the WWTP and located prior to theflow equalization tank,
and aeration tank. Purpose of these screens is to remove large pieces of foreign material from the
wastewater.It also coagulates suspended FOGS. 1" C'
draw�wps
Operation clvx Q ws"
Wastewater flows into the aerated screen tank, which is aerated from the bottom. A 3/4-inch bar rack
catches large foreign material. Bar Racks (3/4 inch)are aerated with a diffuser installed below.
ho
Maintenance
Large solids accumulated in aerated screen tank and on the bar racks should be removed periodically,at
least twice a week.
5

SECTION 4
FLOW EQUALIZATION TANK
Using the actual data of flow-in rate, numerical analyses were performed to determine the optimum
capacity of flow equalization pump.
For numerical analyses,the following parameters and assumption were applied:
Flow-in rate for one week: actual flow data from 1/2/2002 to 1/8/2002
Flow Equalization Tank: 5,017 gallon(9.2' h x 8.1'w x 9.0' h)
Influent BOD: 250 mg/I -
Effluent BOD after 10 hours: 25 mg/1
Volume of Aeration tank: 12,712 gallon
Capacity of flow equalization pump: 540 gallon/hour
BOD removal rate: First order reaction(-dL/dt=KSL)
�q ' ^ L: Influent BOD [kg/m3]
l3' 00D J t: Aeration period [hour]
600
K: BOD removal rate coefficient [1/hour]
S: Average MLSS [kg/m3]
Results of the numerical analyses are shown below.
Water depth varies from 1 feet to the maximum depth of 9 feet. Even in the peak flow of 5'h day, the
water does not overflow. The flow of the 5th day is gradually pumped out during two days.
Figure 3. Water depth in the flow equalization tank during one week
water depth-h FEr
i
1000 ( !
700 }t
a 600
a I
Soo ----L — --
—� -
w Opp — I -- ----
3 300 — — — L—
200
100 ----� -- — —
ODO
1 13 25 37 49 61 73 85 97 log 121 133 145 157
Tine Lhours]
6

Figure 4 shows the flow fluctuation of flow-in to the flow equalization tank (blue line) and flow-out
from the tank(red dots). When the flow-in rate is less than the capacity of flow equalization pump(540
gallon/hour), red dots are on the blue line, that is, there is no reduction in the peak flow factor.
However, when the flow rate exceeds 540 gallon/hour, the pump is operated as a flow equalization
device. Average peak flow factor is reduced from 1.77 to 1.29.
Figure 4.Flow fluctuation for flow-in and flow-out
F1W FIXWtbn[n and atl
I 1z00t.-
1000 --� ----�— -- —
800 - -
o
600 - - -- - - - — - - i
— - -- -
� iLL 400 I I
I
200
� �l
0
1 13 25 37 49 61 73 85 97 109 121 133 145 157
jTine OMM3
If there is not a flow equalization tank and fluctuated flow is applied to the aeration tank, the predicted
effluent BOD from the aeration tank is shown in Figure 5. Some data exceeds BOD of 30 mg/1 (21
hours within 7 days). Effluent BOD is related to the influent flow rate. Usually BOD has lower values
in the morning.
Figure 5. Predicted effluent BOD without flow equalization system
----- --- --------=---------
EftLent—BOD w'ihout FbW Eq�al'vatbn i
45 --
40
35
30 -- - -- - �_ —
25 — —�— -- ------ ----- - -- t
1 0 2010
= -
15
---- -
:
I I
0
1 25 49 73 97 121 145
Tine (hours]
7

If flow equalization system is properly designed and operated, the predicted BOD is always less than 25
mg/I (see Figure 6.)
Figure 6.Predicted effluent BOD with a flow equalization system
Effbent BOD without FbW EcpaTEathn
30
25
20
15
rn
10
5
0
1 26 51 76 101 126 151
Tine Lhou rs]
According to this analyses,following conclusions were made:
(1) The volume of the flow equalization tank is proper for equalization. (,5,017 gallon),
(2) The capacity of the flow equalization pump is proper for equalization. (540 gallon/hour)
8

SECTION 5 I
AERATION TANK
cL�� '
SUBMERGED FIXED MEDIA PROCESS O1
The fixed media is suspended in the extended aeration chamber in baskets sized to fit the chamber and
positioned to allow maximum circulation of the effluent. � • 7 n�A0 -'
Air diffusers are located and air volume adjusted for ideal efficiency.
��,`�o�k(t� U
1 ;15
Submerged Fixed Media Process technology has developed rapidly in the last three decades.
Compared with activated sludge processes, the most important advantage of microbial film process is
ease of maintenance. Using this technology, existing wastewater treatment facilities can be renovated.
Benefits include:-elimination of adjustments of Sludge Return Rate, settleability of MLSS, and no more
cleat-ling-up of scum in the clarifier.
F,a �• Flow
Aendon Taek A panem
Aledia qq
&'t�x <: I �� �IInII (III{'', 3 1J11III I .I{jltl{1 ('{III�I a'i � j}# 5 Clarifier
3
, I_. •.: �.1�'� 1 I
fir^
PLAN VIEW - A . Di(fuxr Flmem
Fnv Flaw
kkdia pxiem /
p O 10 OSiO{Y��p.iPTW a4•N0 O ..;'+---���ptSVEWdi.
Media is randomly packed in plasucbaskets. Those plastic baskets are installedin the aeration tank. VIEW A-
ELEVATION VFW Di(firu
Figure 7.Fixed media Figure 8.Schematic view of fixed media system
I
Fixed media packed in baskets made of Tensar Geogrid which are securely installed in the aeration tank.
The location of diffusers are shifted from the wall side to the center of the tank for uniform distribution
of the air.
-b i4 st,r "I-a U atZ0k , Q.Cr s uff� (+Oka MAI& blov�e rs ecr u
aA-- ,aeff 16 &ey5er- p-t./r
9

POLYPROPYLENE MEDIA
The media is molded from a strong, lightweight, thermoplastic resin(polypropylene) and is suitable for
wastewater treatment applications. The product is non-toxic to microorganism, immune to rot, fungus
and chemically resistant to normal concentrations of sewage acids, alkalis,organic solvents and organic
compounds. Also,it has a high resistance to ultra-violet degradation,aging,erosion and disintegration.
Each individual piece of media shall be of a cylindrical configuration with a diameter dimension in
excess of 2.5 times its height dimension. It will have 4 continuous internal radial ribs and 2 concentric
circular sections. The outer wall of each piece being formed by eight sections of arc, with a radius of
arc approximately 1.25 inches in order that adjacent pieces of media do not occlude or block off
contacting sections of surfaces.
_ pF
Figure 9. Polypropylene media (Diameter= 7.4 inches,Thickness= 2 inches)
10

SECTION 6
CLARIFIER
Two 2" Geyser Pumps are installed in the existing clarifiers. The Geyser Pump allows for prolonged
settling time in the clarifier.
� �ec
t
t$
'� �rn
a V
11

SECTION 7
OPERATION OF THE SYSTEM
GENERAL OPERATING CONDITIONS
- Clean aerated scree
- Set the flow rate 6f two Geyser pumps in the flow equalization tank at 270 gallon/hour/pump.
- Rate of aeration should be that required to maintain a DO concentration of more than 1 mg/1 in the
aeration tank. If DO is less than 1 mg/1{ the media should be backwashed by closing half of the
valves to the diffuser. The duration of backwashing is 15 minutes. After backwashing, the valve
should be adjusted for normal aeration.
- Adjust the pH of the mixed liquor in the aeration tank to a value of 6.5-8.0 using time and/or
biocarbonate of soda.
- SV30 have to be less than 2%. To reduce SV30, waste sludge from the clarifier to the sludge
holding tank.
- Remove scum with a floating scum skimmer.
- Check the transparency of the water in the chlorine contact tank
- Waste the sludge from the clarifier to the sludge holding tank.
- Check the level of sludge in the sludge holding tank.
- Check the accumulation of sludge in the chlorine contact tank.
- Check the height of sludge zone in the clarifier.
how 'o b�ckweol� �'
1) Timing of backwash JJ
Wx.�5 ,
(a) DO is less than 1 mg/I
(b) Sloughed biofilm is blackish.
(c) "Transparency is getting worse.
2) Timing of Desludging
Desludgurg frequency of sludge holding tank is once every 1 to 1.5 months in general.
3) Blower check -
Check and clean the flow inlet filter when it is dirty. If this is left unchecked, damage to the
blower may result and treatment quality may also suffer. Check for vibration and the amperage
draw of the blower to be sure it is within acceptable limits as noted on the blower nameplate.
4) Mechanical failure of the blower
The prime opportunity for failure of the blower is the internal bearing. They can fail from lack of
lubricant or contaminated lubricant. Another opportunity for failure is excessive wear of the
impeller resulting in lower volumes of air delivery.
a) To avoid failure, the blower selected for the unit is equipped with double sealed bearings to
12

r 1
maximize their life.
b) Excessive wear of the impeller has been avoided by installing an inlet filter to take our any
debris that could pass through the inlet screen.
5) Electrical failure of the blower
This may take place in the form of overheating or shorting out because of moisture or dirt. Both of
these modes of failure have been addressed by using TEFC motor. With the motor being totally
enclosed, the problem of dirt and moisture collecting on the windings to shorten insulation life has
been eliminated. The fan cooling will help the motor maintain allowable rumning temperature.
The totally enclosed rating helps maintain the internal cleanliness of the motor.
6) Process failure
If the biomass is starved of oxygen, the typical odors associated with anaerobic bacterial treatment
will be noticed. A blockage in the air line or blower is the most probable cause.
a) The inlet screens have been located on each end of the blower housing. If one screen becomes
blocked by debris, the opposite screen should still be sufficient. The suggested routine
preventive maintenance calls for brushing off the screen as needed. The configuration of the
inlet screens and the required maintenance will protect the unit from oxygen starvation due to
insufficient air flow.
b) The blower is equipped with an inlet air filter. 1f this filter becomes blocked with debris it
could cause oxygen starvation of the biomass. The blower inlet filter should be checked every
6 months and replaced as needed.
c) There is a possibility that the air line from the blower could become blocked. If this condition
is suspected,disconnect the air line from the blower and check for blockage.
13