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HomeMy WebLinkAboutItem 6_7 PPP 05-01-2019 Operations Meeting - Iron Chemical s L V H L V4 L1 �v. A, v Al , k2l . ME PAN Y' gill'ifi !i, 19 h I o r i d e • Coagulant of choice for WWT applications due to its high efficiency and effectiveness in clarifying and reducing suspended solids • Reacts with sulfates to prevent the formation hydrogen sulfide odors Cost • $600-750 per dry ton ($25-31 per 1 ,000 gal) - �--- x 7,077 dry tons = $4.2-5.3M Alternatives — None as effective, some create additional sludge • Aluminum Sulfate, Aluminum Chloride and Sodium Aluminate • • Ferrous Chloride, Ferric/Ferrous Sulfate t- Ferr'ic Chlor'ide Commerc 'ial Ii ., look. Cons 'iderat'l • Ferric is a specialty chemical with a limited number of suppliers • In the past there have been industry consolidations (single supplier) and price spikes . • Vendors require a significant supply chain/infrastructure to make/purchase and transport the product. • The District has adopted a policy to support multiple vendors to maintain competition in the market. This is the basis for recommending two contracts to supply the same chemical . Regional HABRA Pacific Quality Partners (PQP) Brea Yorba Linda FULLERTON YORBA LIND- Odor Control Station Hager-Pacific PLA TIA (Siphon Treatment) 36 Caustic SlugDosed Manholes Buena Park ❑ Bioscrubber u a PA -. LA 9 Chemical Dosing Stations L ANAHEIM Chemical Tanks: L: VILLA Ferrous Chloride (6) Y RES PARK TA N T N r- �_j Calcium Nitrate (4) Los GARDtN A AMITOS GGSD GRO E ORANGE Magnesium Hydroxide (3) 11 e Tifffan9h y PS Continuously-Dosed Sewer Segments: ll ..�� �U�IESTIWIINSTF. Sunflower SeahBeach " Midway City LA Baker-Main (Airbase) Pu On mp{Stati Sanitary DistrictSAN AN Knott Interceptor OLIN N TINS; C A - ' -- Miller-Holder Main St Newport HUNTINGTON ILL p BE Pump Station COSTA IRVINE Non-Dosed OCSD Sewer MESA � IRWD NEWPOR"1 Michelson V ® ACH WWTP Bay Bridge N Pump Station Crystal Cove Ak Pump Station Ca(' NO3)2 Collect '10 1 calcium 6 oxygens 'aw* ►�'� ` <- nitrogensQ' • Ferrous chloride — oxidize and/or precipitate dissolved sulfide . • Sodium hydroxide — deactivating/inhibiting the slime layer. • Calcium nitrate — prevent the formation of sulfides • Magnesium hydroxide — adjustment of pH , suppress odors Ferrous Chloride Solution 34% Sodium Hydroxide Solution Calcium Nitrate Solution 60% 1 Magnesium Hydroxide 60% 4Lv� Ir Recommendatii-IF, • Staff recommend the continued use of ferric chloride and ferrous chloride for odor control and enhanced settling of sludge. • Staff recommend the award of two agreements for ferric chloride purchase to support market competition and resilient supply. • Staff recommend the approval of ferrous chloride contingency increases due to changes in market conditions.