Operations and Maintenance Plan

320 Pages·2015·15.54 MB·English

by  Windows User

THE CITY AND BOROUGH OF JUNEAU
JUNEAU-DOUGLAS WASTEWATER TREATMENT PLANT
Permit No.: AK0023213

Operations and Maintenance Plan

Prepared by:
City and Borough of Juneau
Department of Engineering and Public Works
Utilities Division-Wastewater
2009 Radcliffe Road
Juneau, AK 99801

Revisions:
May 2006
November 2015
JDTP Operations and Maintenance Plan

TABLE OF CONTENTS
A. INTRODUCTION ..........................................................................................................................4
A.1 JUNEAU-DOUGLAS WWTP 2015 APDES PERMIT EFFLUENT LIMITS ................................................. 5
B. FACILITY DESCRIPTION ................................................................................................................7
B.1 PLANT PROCESS ................................................................................................................................ 7
B.2 PRELIMINARY TREATMENT PROCESS ................................................................................................ 8
B.2.1 Grit Channel .................................................................................................................................... 8
B.2.2 Auger Screenings ............................................................................................................................ 9
B.3 SECONDARY TREATMENT PROCESS .................................................................................................. 9
B.3.1 Aeration .................................................................................................................................. 10
B.3.2 Clarification ............................................................................................................................. 10
B.4 DISINFECTION .................................................................................................................................. 11
B.5 DISCHARGE TO RECEIVING WATERS ............................................................................................... 12
B.6 NON-POTABLE WATER SYSTEM ...................................................................................................... 12
B.7 SIDE STREAMS ................................................................................................................................. 12
B.8 SOLIDS PROCESSING ....................................................................................................................... 12
B.8.1 Secondary Clarifier Solids ........................................................................................................ 13
B.8.2 Waste Removal ....................................................................................................................... 13
B.8.3 Secondary Scum Collection ..................................................................................................... 14
B.8.4 Waste Solids Holding Tank ...................................................................................................... 14
B.8.5 Solids Dewatering and Transport ............................................................................................ 15
C. AUTOMATIC CONTROLS ............................................................................................................ 16
D. PROCESS CONTROL STRATEGY .................................................................................................. 17
D.1 CONTROL PARAMETERS .................................................................................................................. 17
E. SAMPLING PLAN ....................................................................................................................... 18
E.1 SAMPLING PROGRAM ..................................................................................................................... 18
E.1.1 APDES Permit Monitoring Locations, Parameters Measured, and Collection Frequencies ... 19
E.2 SAMPLING METHOD REQUIREMENTS ............................................................................................ 19
E.2.1 Sample Types .......................................................................................................................... 19
E.2.2 Sample Equipment and Containers ......................................................................................... 20
F. POLLUTION PREVENTION AND CONTROL .................................................................................. 22
F.1 SPILL PREVENTION .......................................................................................................................... 22
F.1.1 Sludge Storage and Transport ................................................................................................. 22
F.1.2 Polymer Storage ...................................................................................................................... 23
F.1.3 Ancillary Operations ................................................................................................................ 23
F.2 SPILL AND LEAK RESPONSE ............................................................................................................. 23
F.2.1 Sludge ...................................................................................................................................... 24
F.2.2 Polymer ................................................................................................................................... 24
F.2.3 Ancillary Operations ................................................................................................................ 24
F.3 OPTIMIZATION OF CHEMICAL USAGE ............................................................................................. 24
F.4 PREVENTIVE MAINTENANCE PROGRAM ......................................................................................... 24
F.5 MINIMIZATION OF INDUSTRIAL POLLUTANT INPUTS ..................................................................... 24
F.6 PUBLIC EDUCATION AND OUTREACH ............................................................................................. 25
F.7 WATER CONSERVATION .................................................................................................................. 25
JDTP Operations and Maintenance Plan

LIST OF APPENDICES
Appendix A - APDES Permit and Fact Sheet
Appendix B - UPCPs
Appendix C - Facility Operation Evaluation Report
Appendix D - Facility Plan Report
Appendix E - Facility Maintenance Evaluation Report
Appendix F - Combined Sewer Overflow Report
Appendix G - GPS Coordinate Map of Sampling Locations

LIST OF FIGURES
Figure 1 - JDTP Vicinity Map
Figure 2 - JDTP Process Flow Diagram
Figure 3 - Grit Settling Chamber
Figure 4 - Auger Monster
Figure 5 - Aeration Basin
Figure 6 - Secondary Clarifier
Figure 7 - Ultra Violet Disinfection System
Figure 8 - Scum Collection-Clarifier Skimming Arm
Figure 9 - Waste Solids Holding Tank
Figure 10 - Belt Filter Press Figure 11 - JDTP Sampling Locations
Figure 12 - Lined Conex Container
Figure 13 - Polymer Mixing and Storage Area

LIST OF TABLES
Table 1 – JDTP Monitoring Requirements and Effluent Limits
Table 2 – JDTP Boundary of Chronic Mixing Zone Monitoring Requirements
Table 3 – JDTP Ambient Station Monitoring Requirements
Table 4 – JDTP CSO Diversion Effluent Monitoring Requirements
Table 5 – Process Control Strategy
Table 6 – JDTP Monitoring Locations, Site Descriptions and Site Selection Rationale
Table 7 – CBJ Sample Collection Equipment and Field Instrumentation
Table 8 – Summary of Sample Containers, Preservation, Volumes, and Hold Times
JDTP Operations and Maintenance Plan

A. INTRODUCTION
This Operations and Maintenance Plan (OMP or Plan) is prepared to assist the City and Borough of
Juneau’s (CBJ) Wastewater Treatment staff to properly manage and operate the Juneau-Douglas
Wastewater Treatment Plant (JDTP), and is part of the requirements of the Alaska Pollutant Discharge
Elimination System (APDES) permit issued for the plant on June 1, 2015 (Appendix A). The Plan is not
intended to be all inclusive. Operations and maintenance staff members should review and fully
understand state regulations, as well as the design and operations and maintenance manuals provided
by the equipment suppliers for the plant.

Included in this document are an overview of the facility, process components and general operational
approach. The Plan also contains best management practices (BMPs) that include measures to prevent
or minimize the potential for the release of pollutants to Gastineau Channel. This OMP identifies sources
of pollutants at JDTP and current control measures to mitigate such sources. A map of the facility and
surrounding area is shown in Figure 1.

Figure 1. JDTP Vicinity Map

More detailed discussion of each process is provided in the Unit Process Control Procedures (UPCP)
(Appendix B) and Standard Operating Procedures (SOPs) for each major process employed in the facility.
Please refer to these documents for operational rationale, troubleshooting, and start up and shut down
impacts and procedures. SOPs are located in a separate binder and should be made available in the
treatment plant.

A sampling plan for the facility is included in this document. While there is some latitude on collecting
and analyzing process samples, the permit samples noted in the plan must be collected on the time and
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JDTP Operations and Maintenance Plan

date specified, unless unusual circumstances prevent their collection at the appointed time. More
detailed information regarding sampling procedures, data generation and acquisition and contract
laboratories is available in the Quality Assurance Project Plan (QAPP).

This Plan also includes four additional reports: the Operation Evaluation report, Facility Plan,
Maintenance Evaluation report, and Combined Sewer Overflow report (Appendices C-F, respectively).
These documents serve as a reference to existing equipment and processes, and identify potential
future needs of the facility.

The overall objective of the facility is to operate as efficiently as possible while ensuring continuous
compliance in accordance with the APDES permit limits shown in the subsequent sections. In addition to
yearly review, the OMP and BMPs will be revised or amended whenever there is a change in the facility
or operation of the facility, which markedly increases the generation of pollutants, their release or
potential release to the waters of the United States through normal operations and ancillary activities.
A.1 JUNEAU-DOUGLAS WWTP 2015 APDES PERMIT EFFLUENT LIMITS
Table 1. JDTP Monitoring Requirements and Effluent Limits
a
Effluent Limits Monitoring Requirements
Average Average Maximum
Parameter Units Sample Sample
Monthly Weekly Daily b Sample Type
Location Frequency
Limit Limit Limit
Flow MGD 2.76 --- 6.0 effluent continuous recording
mg/L 30 45 60 influent &
1/month 24-hr composite
lb./day 690 1035 1380 effluent
BOD
5 effluent vs
% removal 85 See Permit AK0023213 1/month calculation
influent
mg/L 30 45 60 influent &
1/month 24-hr composite
lb./day 690 1035 1380 effluent
TSS
effluent vs
% removal 85 See Permit AK0023213 1/month calculation
influent
c, d, e
Fecal Coliform FC/100 mL 200 400 800 effluent 1/week grab
Enterococci Bacteria Count/100 N/A N/A Report effluent 1/monthh grab
mL
Total Ammonia as N mg/L 14 21 30 effluent 1/month 24-hr composite
pH s.u. 6.5 - 8.5 effluent 5/week grab
f
Dissolved Oxygen (DO) mg/L 2.0 --- 17.0 effluent 5/week grab
Copper µg/L --- --- report effluent 1/quarter 24-hr composite
Temperature oC --- --- report effluent 5/week grab
g
Whole Effluent Toxicity TUc --- --- --- effluent 1/year 24-hr composite

Notes:
a. Effluent samples must be collected after the last treatment unit prior to discharge.
b. Influent and effluent samples must be collected during the same 24-hour period.
c. FC/100 mL = colonies of fecal coliform bacteria (FC) per 100 mL.
d. All fecal coliform bacteria average results must be reported as the geometric mean. See Permit No. AK0023213, Table
2 for more information.
e. Reporting is required within 24 hours of a maximum daily limit violation.
f. Daily minimum DO concentrations.
g. Refer to the Permit No. AK0023213 Part 1.3 for sampling requirements.
h. Sampling is only required during the months of May-September and should occur at the same time as FC sampling.

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JDTP Operations and Maintenance Plan

Table 2. JDTP Boundary of Chronic Mixing Zone Monitoring Requirements
Parameter Units Sampling Frequency Sample Type Sampling Frequency
Fecal coliforma #/100 mL 1/month b grab 1 day/week
Enterococci Bacteria counts/100 mL 2/year c, d, e grab ---

Notes:
a. All mixing zone fecal coliform bacteria average results must be reported as the geometric mean. See Permit No.
AK0023213, Table 2 for more information.
b. FC bacteria must be monitored once/month during May, June, July, August, September, and October, and twice [two
more times] during November - April. See Permit Section 1.5.5.
c. Monitoring results must be submitted to DEC with the DMR for the month following the sample collection.
d. Twice per year consists of one sample taken in the summer months (June 1-Sept. 30), and one in the winter (Oct. 1-
May 31).
e. Sampling should occur at the same time as FC bacteria sampling.
Table 3. JDTP Ambient Station Monitoring Requirements
Parameterc Units Sampling Frequency Sample Type Effluent Sampling Frequency
Total Ammonia mg/L 2/year b grab 1/month
pHa S.U. 2/year b grab 5/week
Temperaturea OC 2/year b grab 5/week
Salinitya g/kg 2/year b grab ---

Notes:
a. Ambient station ammonia, pH, temperature, and salinity samples should be taken concurrently with the boundary of
the mixing zone ammonia sample.
b. Twice per year consists of one sample taken in the summer months (June 1- Sept 30) and one in the winter (Oct 1-
May 31).
c. Monitoring results must be submitted to DEC with the DMR for the month following the sample collection.

Table 4. JDTP CSO Diversion Effluent Monitoring Requirements
Parameter Units Sample Location Sampling Frequency Sample Type
Flow MGD effluent each opening recording
mg/L
BOD effluent each opening grab
5
lbs./day
mg/L
TSS effluent each opening grab
lbs./day
Fecal Coliform #/100 mL effluent each opening grab
Enterococci Bacteria counts/100 mL effluent each opening grab
Duration of opening hours effluent each opening recording
Reason for discharge --- --- each opening ---
Volume of discharge effluent each opening ---

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JDTP Operations and Maintenance Plan

B. FACILITY DESCRIPTION
The Juneau-Douglas Wastewater Treatment Plant is a Level II, 6.0 MG daily maximum, flow-through
activated sludge facility utilizing aeration and sludge digestion technologies. The facility is designed to
treat domestic wastewater from the City and Borough of Juneau community, as well as seasonal
discharge from cruise ships and occasional combined sewer overflows (CSO).

JDTP is open four days a week, Monday through Thursday, and has at least one Level II licensed operator
on staff during business hours. During off hours or non-business days, an on-call operator makes daily
rounds and is the primary contact for emergencies. The plant’s SCADA system alerts the on-call operator
of any issues occurring after hours.

This section discusses the basic purpose of each process in the plant, which primary process units or
equipment is implemented, and identifies potential sources of pollution to the receiving waters. More
detailed operating parameters are shown in the Process Control Strategy (Section C), UPCPs (Appendix
B), and SOPs.
B.1 PLANT PROCESS
Figure 2 demonstrates the flow of wastewater and solids handling for JDTP. Wastewater enters the
facility by gravity via siphon inlet manhole at the edge of the property. Debris is removed in the
headworks by a grit channel and auger. The raw water then enters the aeration basins for biological
treatment. The partially treated water flows to secondary clarifiers for solids separation. Supernatant is
gravity discharged over the weirs from the clarifiers and then to a UV channel for disinfection and final
discharge into Gastineau Channel. Sludge is wasted from the clarifiers and aerated in a sludge holding
tank before being dewatered and disposed.

The following sections will discuss the various stages and their purpose at the JDTP:
• Preliminary Treatment- Grit Removal, Screening
• Secondary Treatment- Aeration, Clarifiers
• Disinfection
• Side Streams
• Solids Handling- Waste Sludge, Scum Collection, Solids Holding Tank, Dewatering and Transport

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JDTP Operations and Maintenance Plan

Influent
Headworks Biological UV Disinfection
Treatment
Grit Settling Aeration Clarifiers
Basin Basins 1 & 2 1 & 2
Solids Wasting Liquid Effluent
Solids
Disposal
Gastineau
Channel
Recycle
Digester
Recycle
Solids Handling
Belt Filter Press
Oregon
Landfill
Sludge Shipping Container
Figure 2. JDTP Process Flow Diagram
B.2 PRELIMINARY TREATMENT PROCESS
Upon entering the treatment plant, raw influent begins preliminary treatment. The preliminary
treatment process occurs at the headworks and consists of grit removal and screening to eliminate
large, undesirable material that can wear down equipment and hinder the overall treatment process.

Flow may be redirected at any point during preliminary treatment. The grit chamber is equipped with a
manually-operated bypass channel to direct flow to the auger if the collector or flight conveyor is offline.
Should the auger be offline, flow may be directed to a manually-cleaned bar rack without any
interruption to influent flow to secondary treatment.
B.2.1 Grit Channel
Grit removal is accomplished by settling in the grit chamber (Figure 3). The low velocity chamber allows
grit to settle while the influent continues down the treatment train. Settled grit is collected via
mechanical rake which pushes the material into a small sump opening to the flight conveyor. From
there, the grit is then dewatered, deposited to a hopper and subsequently disposed of to a landfill.

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JDTP Operations and Maintenance Plan

Figure 3. Grit Settling Chamber
B.2.2 Auger Screenings
After grit is removed, a JWC Auger Monster washes and screens rags and other large, unsettled debris
(Figure 4) out of the influent. A perforated screen on the auger allows water to flow while the undesired
material is washed, compacted and transported to the disposal bin. As solids are removed, dual wash
water zones clean-off fecal material. The rotating auger then conveys solids to the discharge point
where the cleaned and dried material is deposited into a hopper. Once removed, the screenings are
disposed of in a trash dumpster that is emptied weekly and disposed of to a landfill.

Figure 4. Auger Monster
B.3 SECONDARY TREATMENT PROCESS
Following preliminary treatment is the secondary treatment process consisting of the aeration system
and clarification system.
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JDTP Operations and Maintenance Plan

Secondary, or biological treatment, is the portion of the process which removes dissolved and colloidal
compounds measured as biochemical oxygen demand (BOD), total suspended solids (TSS), ammonia and
other compounds undesirable in the final effluent (see Table 1 for permit effluent limits). Microbes
break down this organic waste using oxygen supplied by surface aerators. Following aeration, the
partially treated water (now called mixed liquor) is allowed to settle in clarifiers to remove the larger
particles that formed during the aeration process. The biologically-rich settled solids are returned to the
aeration basin as return activated sludge (RAS), mixing with the influent wastewater as it enters the
aeration basins, repopulating the microorganisms (see Section B.8 for more information).
B.3.1 Aeration
JDTP is a complete mix, conventional activated sludge process; the influent stream is under a constant
mix with the RAS from the clarifiers (see section B.8.1 for more detail). As screened influent wastewater
enters one or both of the aeration basins, it mixes with returned activated sludge from the secondary
clarifiers (Figure 5). During the aeration process, the activated sludge organisms (microbes) use the
available organic matter (influent) as food. Activated sludge refers to a mass of microorganisms
cultivated in the treatment process to break down organic matter into carbon dioxide, water, inorganic
compounds and energy for their own growth and reproduction. The constant mixing provided by 2
surface aerators creates stable solids and repopulates the microbial community. The system is operated
to maintain a DO concentration of 2 mg/L.

Figure 5. Aeration Basin
B.3.2 Clarification
The fully mixed and aerated solution of mixed liquor flows by gravity from the aeration basins to a
distribution splitter box where it is evenly distributed between two clarifiers (Figure 6). Clarification, or
settling, allows larger activated sludge particles to settle to the bottom of the tanks while the clear
supernatant (secondary effluent) discharges over the 90-degree V-notch weirs around the
circumference of the tanks.

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