Case Study for Customer Location CA112:
Reservoir or Lake Use:
The city’s Community Services District operates this 0.5 MGD wastewater treatment plant, expanding to 1 MGD.
System Overview and Reservoir:
The wastewater treatment system consists of 6 ponds/cells. The first cell (AL-1) is a total mix cell with a surface area of 1.2 acres and maximum depth of 10 ft; the second (AL-2) and third (AL-3) cells are partial mix cells with surface areas of 1.9 and 1.8 acres, respectively, and maximum depths of 10 ft; and, the last three cells (SS-1, SS-2, SS-3) are polishing ponds with surface areas of 1.2, 1.8, and 1.8 acres respectively, and maximum depths of 4 ft in each cell. Total surface area is 9.7 acres, total
volume is 14.4 MG, and total retention time through the 6-pond system is about 27 days.
Reported Problem Before Installation:
Objectives are to improve treatment for removal of BOD, TSS and ammonia, and prevent short-circuiting that was occurring within each pond. Secondary objectives include reducing aeration runtime for the aerators in the first three cells, and enhance in-situ sludge reduction.
Installation:
Date: Jan 2005, installed six (6) SolarBees total, one per cell. In AL-1, the primary cell which is a total mix cell, 1 SB10000v12 was installed; in AL2 and AL3, one each SB10000v12-Dual Mix units were installed; one each SB2500v12 were installed in SS1, SS2, and SS3.
Results:
Water quality improvements occurred almost immediately following the SolarBee installations, with ammonia levels sufficiently reduced to meet regulatory requirements - even in winter. The city has achieved a 66% energy savings by reducing aeration runtime, and was subsequently awarded an energy
savings grant from the Wastewater Optimization Program that paid for about 1/3 of the cost of the six units. In addition to the improved water quality and elimination of short-circuiting, the owner also reports significant in situ sludge reduction in the cells. The city has been very happy with the performance and
attained benefits with the SolarBees in their wastewater treatment system.
Updated: 01/10/2007
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