HomeMy WebLinkAbout06.a.1) Update on Field Verification of Primary Sedimentation Basin Baffles6-a-0
Central Contra Costa Sanitary District
August 15, 2013
TO: HONORABLE BOARD OF DIRECTORS
FROM: CURTIS W. SWANSON, PROVISIONAL GENERAL MANAGER
SUBJECT: SCHEDULE OF BOARD REPORTS ABOUT THE NUTRIENT
REMOVAL FACILITY PLAN AND SITE CHARACTERIZATION
Overview
Under the National Pollutant Discharge Elimination System (NPDES) Permit
issued by the San Francisco Bay Regional Water Quality Control Board
(RWQCB) on February 16, 2012, the District is required to evaluate alternative
treatment technologies to remove ammonia from its discharge to Suisun Bay,
including nitrification technologies. The District developed a Facility & Site
Characterization Work Plan in June 2012. The three elements of the Work Plan
are listed below:
An Existing Plant Optimization for Ammonia Removal Evaluation to
determine the extent to which ammonia - nitrogen (NH3 -N) removal can be
achieved with relatively modest changes to the existing process and
improvement of facilities in the near -term; and
2. A Nutrient Removal Facilities Plan to investigate the applicability of both
conventional and emerging innovative technologies for the removal of
ammonia and nitrate /nitrite- nitrogen from the District's wastewater
discharge in the long -term with acceptable generation of greenhouse
gases (e.g. nitrous oxide); and
3. A Site Characterization Study to evaluate the suitability of property owned
or controlled by the District to provide land necessary for ammonia and /or
nitrate plus nitrite removal facilities.
Results from the Existing Plant Optimization for Ammonia Removal Evaluation,
Nutrient Removal Facilities Plan, and Site Characterization Study will be
presented in the Facility Plan and Site Characterization Report to be submitted to
the RWQCB by February 28, 2014.
Board Report Schedule
Staff will present a summary of the three elements of the Facility Plan over the
next six months. The schedule for the staff presentations is:
i ig
Field Verification of Primary
Sedimentation Basin Baffles
Treatment Plant Optimization
Evaluation for Ammonia Removal
Site Characterization — Part 1
Soil Investigation
Site Characterization — Part 2
Remediation Alternatives
Long -Term Ammonia Removal
Evaluation
Facility and Site Characterization
Report
Board Meeting Date
August 15, 2013
September 19, 2013
October 17, 2013
November 21, 2013
December 19, 2013
January 16 or 23, 2014
Field Verification of Primary Sedimentation Baffles Report (first report)
The first staff report to be presented at the August 15 Board meeting will be
about the results and conclusions of the field testing of the Primary
Sedimentation Basin Baffles. Previous studies found that the removal levels for
solids and particulate -bound organic material by the District's primary treatment
process were at the lower end of the ranges cited in the research and industry
literature. Low organic and solids removal affect the downstream secondary
treatment process. Increasing the removal levels in the primary treatment
process would reduce operational costs, aeration demand, and make capacity
available in the secondary treatment process for ammonia reduction.