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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0071 -4-
<br /> CALIFORNIA NATURAL PRODUCTS
<br /> WASTEWATER TREATMENT FACILITY
<br /> SAN JOAQUIN COUNTY
<br /> 20. CND's treatment of process wastewater consists of screening using a rotary screen and two
<br /> 100-micron stainless steel parabolic screens; holding/recycle tank; pH control; Dissolved Air
<br /> Flotation(DAF) clarifier; a 45-foot diameter, 20-foot high trickling filter; and a 600 gallon per
<br /> minute (gpm) lamella separator with flocculent metering system. Prior to discharge, the
<br /> wastewater is stored in a 13,000 gallon tank.
<br /> 21. The trickling filter operates at 2,500 gpm. Wastewater is recycled approximately ten times
<br /> through the filter. Because the process wastewater is high in BOD and low in nitrogen,the
<br /> Discharger adds ammonium nitrate to the wastewater as a nutrient to optimize BOD removal in the
<br /> trickling filter.
<br /> 22. Wastewater samples are collected by a time composite sampling device,which collects a 100 ml
<br /> sample every one-half hour from the 13,000 gallon discharge tank.
<br /> 23. Solids collected on the screens are placed in containers. Solids that are collected in the lamella
<br /> separator and DAF clarifier are dewatered by a combination of centrifuge and rotary screen. All
<br /> solids are contained in bins, transported off site, and used for animal feed or landfilled.
<br /> 24. RO reject water normally is directed to the 13,000 gallon discharge tank but can be directed to the
<br /> trickling filter. This is done occasionally if the wastewater discharged to the trickling filter
<br /> becomes too acidic due to an overload of sugar and the resulting organic acids. The Discharger
<br /> can raise or lower the pH during the treatment process, but has rarely found it necessary to lower
<br /> the pH.
<br /> 25. Prior to August 2000, the treatment facility contained two bypass lines. The first bypass pipe
<br /> allows discharge of wastewater to land after the screening process. A second bypass pipe allows
<br /> wastewater.from the DAF to be discharged to land without further treatment. Following the
<br /> installation of the pretreatment equipment in early 2000, a significant amount of wastewater
<br /> bypassed the treatment equipment due to various startup problems. Bypassing was stopped on
<br /> 14 August 2000 and the bypass lines were decommissioned. Bypassing the treatment system
<br /> resulted in high strength wastewater being discharged to land and caused objectionable odors;
<br /> therefore, this permit prohibits the bypass of untreated or partially treated wastes. The flows that
<br /> were diverted are as follows:
<br /> Date Units Total Flow Flow to Ci tv Discharge Land Ann. Bypass Flow Percent
<br /> Diverted
<br /> 1/00 Gal/Mo 5,395,900 1,579,600 3,816,300 2,671,000 70.0
<br /> 2/00 Gal/Mo 5,879,500 2,774,100 3,105,400 2,061,622 66.4
<br /> 3/00 Gal/Mo 5,880,100 3,088,400 2,791,700 1,858,900 66.6
<br /> 4/00 Gal/Mo 4,645,800 2,410,500 2,235,300 1,886,100 84.4
<br /> 5/00 Gal/Mo 6,063,000 2,420,300 3,642,700 1,597,300 43.8
<br /> 6/00 Gal/Mo 5,418,400 1,259,000 4,159,400 683,100 16.4
<br /> 7/00 Gal/Mo 6,512,200 1,196,900 5,315,300 1,233,400 23.2
<br /> 8/00 Gal/Mo 7,945,300 2,884,400 5,060,900 588,400 11.6
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