Non-Hazardous Waste Water Facility
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Non-Hazardous Waste-Water Facility

Technology

Technology


Waste streams received at Seaport are treated in two primary steps. First, streams are processed to separate recoverable oil from water. Second, the resulting wastewater is treated by several processes to meet the standards established by the SVCWD for discharge.  Please refer to Figure 1 – Process Flow Diagram.
 

Streams are primarily received into Tanks 45 and/or 46.  Oil is gravity separated in the tanks and periodically transferred to Tank 48 in the wastewater treatment area. Samples are taken at various levels to determine the location of the water and oil phases. Once oil reaches one of the tank draws, it is transferred to Tank 48 to ensure that no oil is carried into the water treatment process.

The water phase is sampled to determine any further pre-treatment needs. One of our main tests is a Chemical Oxygen Demand (COD) analysis. Only wastewater containing less than 10,000 parts per million (ppm) COD will be processed. Waste streams >10,000 ppm COD are treated as Oily Wastes and not managed in the wastewater treatment process.
 

Water meeting the COD criteria is then processed through a Parallel Plate Clarifier (PPC) and a Dissolved Air Flotation (DAF) unit prior to transfer through activated carbon. The pH of water entering the PPC is continuously monitored and adjusted as needed by addition of caustic soda or lime.  Metered amounts of alum and polymer flocculant are added to facilitate removal of oil and solids from the water in the DAF. Trace metals are removed by batch using various chemicals and sodium hydroxide.

Water from the DAF runs to an overflow tank, pumped through two beds of activated carbon into a hold tank and subsequently discharged to the sewer.  Samples are collected periodically at the effluent of the second carbon bed in order to check for breakthrough and to assure compliance with limits set by the SVCWD.

Solids generated from the treatment process are collected from the bottom of the parallel plate clarifier and sent to a dewatering cone bottom tank. Solids are then centrifuged and the dry solids are placed into DOT approved roll-off bins which are covered and transported off-site for disposal.

For more information about our products, services or technology, please contact us at (650) 364-1024.