a. Process modifications to improve mixed liquor settleability and retain solids
within the aeration tanks and/or clarifiers;
I. Evaluate Nitrogen and Phosphorus Removal Alternatives
1.
“vw fF YN
Perform an initial screening of potential phosphorus and long-term nitrogen
removal alternatives.
Calibrate process model.
Perform computer modeling to evaluate enhanced biological phosphorus removal.
Evaluate chemical phosphorus removal alternatives.
k. Anaerobic Digestion System
1. Sludge Dewatering
m. Wet Weather Treatment Facility (influent screening, pumping, and Actiflo
process)
n. Instrumentation and Control, SCADA System
o. Odor Control Systems
2. Prepare a comprehensive process flow diagram for the main WWTF and the
WWFETF showing all major return flows.
3. Building Systems and Site Evaluation
d. Instrumentation, controls and SCADA system components will be
evaluated by an instrumentation engineer.
Electrical power distribution systems will be evaluated by an electrical
engineer. Electrical standby generators will be evaluated by an electrical
engineer and mechanical engineer.
Roadways, access drives, parking areas and walkways will be assessed by
a civil engineer.
3. Each discipline engineer will prepare a memorandum that summarizes the
findings from the site visit including the specific condition assessment results as
9. Analyze dewatering performance including solids capture, polymer consumption,
and cake solids. Summarize annual average, peak monthly, and peak daily sludge
quantities.
10. For WWFTF flows, summarize available data on BOD and TSS removal rates and
effluent quality in terms of concentration and loading.
E. Conduct Plant Infrastructure Assessment
1. Develop a comprehensive plant infrastructure asset inventory:
6.
Prepare technical memorandum summarizing projected growth in residential,
commercial, industrial, and institutional flows. Meet with City staff to review and
finalize memorandum.
D. Analyze WWTF Effluent Quality and Sludge Quantities
12/10/19
1,
Analyze primary treatment removal rates for BOD and TSS and typical effluent
quality both in terms of concentration and mass loading. Summarize available data
on primary sludge quantities and compare to predicted values based on removal
rates.
B. Project Administration and Meetings
1. Each month we will submit a report that details the work performed by the team
on each major task with the monthly project invoice.
2. The following meetings will occur throughout the duration of the project:
a. Eight (8) progress and brainstorming meetings with the project team and
City staff.
b. One project presentation meeting to present final report to City staff.
C. Define Current and Projected Future Influent Wastewater Flows and Loads
12/10/19
include reports for the WWFTF. It is assumed the other CSO facilities
are not part of this facility planning effort.
The current and draft NPDES permits, the status of discharge
requirements at the facility, and the pending application for a new permit.
The latest budget and Capital Improvements Plan (CIP). It is assumed the
City will provide:
EXHIBIT A
20-YEAR FACILITY PLANNING STUDY (Phase 1)
CITY OF NASHUA, NEW HAMPSHIRE
WASTEWATER TREATMENT FACILITY
I. Scope of Work
This scope of work has been prepared for assisting the City in continuing its efforts towards
addressing current and future capital planning needs. The Wastewater Facility Planning Study will
include:
e Acomprehensive review of the current and projected future flows and loads,
e An assessment of the plant hydraulic and treatment capacity,
e An assessment of the process and ancillary equipment,
Pinnette, J.R., Dwinal, C.A.,
Giggey, M.D. and Hendry,
G.E., "Design Implications of
the Biofilter Heat and
Moisture Balance",
Proceedings, 1995 USC/TRG
Conference on Biofiltration,
Los Angeles, California,
October 5-6, 1995
Pinnette, J.R., Dwinal, C.A.,
and Giggey, M.D., “Porosity
of Biofilter Media",
Proceedings, USC/TRG
Conference on Biofiitration,
Los Angeles, California,
October 5-6, 1995
Treatment Facility: What You
Should Be Doing Now,”
NEWEA Annual Conference,
Boston, Massachusetts
January 27, 2015
Peckenham, J.M., Pinnette,
J.R., and MacDonald, G., "The
Biosolids White Paper -
Making Objective Science
Accessible”, International
Water Association Specialist
Conference on Biosolids,
Moncton, New Brunswick,
June 25, 2007
