HomeMy WebLinkAbout03. Wet Scrubber Caustic Injection System Project, DP 7297Wet Scrubber Caustic
Injection System Project
DP 7297
September 9, 2015
Engineering & Operations
Committee Meeting
Craig Mizutani, PE
Senior Engineer, Capital Projects
Central Contra Costa Sanitary District
Project Background
• Clean Air Act Section 129 regulations will
establish new standards for HCI emissions.
• Effective March 21, 2016
• New limits for HCl and scrubber water pH
• pilot testing of caustic soda injection into the wet
scrubber system.
• Wet Scrubbers are key component in
controlling MHF emissions.
3% 9/2/2015
1
Emissions Comparison
• New limits
— 1.2 ppm HCI limit
— Scrubber water pH Parametric for Acid
Gases
— pH limit established from source tests
Measured Values
Furnace No.1
Furnace No.2
129 Limit
HCI Emissions (ppmvd @
0.30-2.04
0.36-6.29
1.2
7%02)
Average Scrubber Outlet
5.9
6.3
T.B.D
pH
��C
9/2/2015
Caustic Injection Pilot
• 5001- NaOH injor+orl gin+„
wet scrubber K
• Permit require
in scrubber we
• Started in Nov
2014
r d
\r
. t
New System Requirements
• 8,000 gallon storage tank
• 400 gpd anticipated normal injection rate
• 800 gpd maximum injection rate
• 3 metering pumps
• Double contained, heat - traced piping
• Designed in -house
• Peer reviewed by CH2M
— Technical Review
9/2/2015
3
CIB & CIP Impacts
• Wet and Dry Scrubber Replacement
Project on hold for Master Plan with total
estimated CIB Project Cost $9,026,000
• Caustic Injection Project (Interim solution)
— Construction Cost Estimate $750,000
—Total Estimated cost of injection $1.1 Million
— Coordinated with Master Plan Team
Current Project Schedule
• Advertise September 3rd and 10th
• Bid Opening October 2nd
• E &O Committee Review October 7th
• Tentative Award October 15th
• End of Construction March 30th 2016
9/2/2015
11
Questions
9/2/2015