Identify regulatory and product market considerations with “no improvements” alternatives over
the 20-year planning period. Meet with representatives of NHDES to assess regulatory concerns.
Meet with RMI and Casella to assess agronomic end-user concerns.
Summarize the necessary capital improvement needs to maintain the existing digester facilities
over 20-year planning period for this “no improvements” alternative.
Identify beneficial use and disposal options over the 20-year planning period with the “no
improvements” alternative.
E. Preliminary Screening of Drying Alternatives:
F.
1.
Determine desired throughput capacity, operating regime. Assess requirements for dewatered
cake storage and feed, drying process throughput, post-processing (finished product
characteristics), and dried product storage requirements.
Conduct a screening level evaluation of drying technology alternatives to process dewatered sludge
for disposal including:
i. Belt Dryer
ii. Rotary Drum Dryer (triple pass type)
iii. Indirect Dryer
Meet with firms that market dried biosolids (RMI, Casella, Synagro, New England Fertilizer) to
assess desirable and minimum acceptable product characteristics for each drying technology.
Obtain input on potential markets for the product from each technology and product storage
requirements. Meet with City landfill staff to assess characteristics to allow land filling and/or use
as daily cover.
Arrange site visits for City staff for 2 days to nearby drying facilities (rotary drum - GLSD, MWRA-
Quincy; paddle-type: Naugatuck, Waterbury, Springfield, other). Arrange one overnight site visit to
remote location to visit belt dryer installation(s}. The budget for this scope item shall include
$4,000 for non-labor travel expenses for Wright-Pierce and City staff.
Develop order of magnitude life-cycle costs for each drying technology option and assess options
for using hot water from CH&P generators and/or biogas as the hot source for the drying process.
A list of non-monetary factors will also be developed for these options as part of the cost-benefit-
risk analysis. Non-monetary factors will include regulatory requirements, equipment footprint,
public acceptance (odors, etc.}, characteristics of dried product, and impact on beneficial use and
disposal options.
Determine recommended technology based on cost and non-cost factors.
Evaluate beneficial use and disposal options with dried Class A product versus continuing with
existing facilities (Class B or less). Develop life cycle biosolids management cost comparison for
most likely beneficial use/disposal option with drying facility versus existing.
Summarize findings in a technical memorandum and submit to City staff for review. Hold meeting
with City staff to review comments and finding. Update technical memorandum based on
comments from City staff.
Preliminary Design Development
1.
Develop preliminary design documents (basis of design technical memorandum and process
drawings) for the recommended technology that includes sizing of drying system; sludge cake
conveying and storage; post processing and storage; and product off-loading.
Develop plan for providing an adequate level of odor control to avoid off-site odor impacts from
drying facility.
WRIGHT-PIERCE = 2 of 3
ing a Better Envi
