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'Tws":'l of the the media, no sludge rising concerns, and withstanding shock loads better than the suspended growth process. The disadvantages of an attached growth process include poorer effluent quality in terms of BOD and TSS, odor production, clogging of distributors or bed, sloughing of biofilm, snail, mosquito and insect problems. The MBBR system is an enhanced activated sludge process with biomass attached on small bio- media suspended in mixed liquor. The MBBR combines the advantages of a suspended growth process and an attached growth process. Compared to the conventional activated sludge system, the MBBR has the advantage of providing a greater biomass concentration therefore increasing treatment capacity, no sludge bulking concerns, having more process operation stability, reduced sludge production, enhanced sludge settleability, and lower costs for operation and maintenance. Compared to the attached growth process, the MBBR has advantages in providing a good quality effluent, easily designed for nitrogen and phosphorus, more opportunities for contact with organic matter nutrients and air, no odor or mosquito/insect problems. Since there are no sludge bulking concerns and no odor and insect concerns, thus, LESS TECHNICAL SUPPORT AND OPERATING SKILLS ARE REQUIRED FOR DAILY OPERATION. This is critical for a small scale wastewater treatment facility, like the WCMCRWWTP. It is economically not reasonable to hire a professional management team for daily operations. The performance of the MBBR can be easily controlled by the sludge retention time (SRT) and oxygen supply. Basically, the inline DO monitoring controls the blower operation to provide enough oxygen. The amount of sludge wasting can control the biological system growth and normal functioning. The daily operation of the MBBR process can be automatically controlled and executed by the PLC. In our MBBR design for the WCMCRWWTP, the dissolved air floatation (DAF) was introduced to separate the microorganisms from the treated effluent. This completely solved the concerns of the solid water separation. The effluent from the secondary wastewater treatment process is being polished by the California Title 22 Water Recycling Criteria (WRC) accepted membrane filters. Since the previous secondary wastewater treatment process units have significantly removed the organic matter (BODS) and TSS, the membrane filter can expect lower organic loading, less biofouling concerns, less backwash and chemical cleanings. The membrane filter will screen most of the turbidity and microorganisms out of the system and produce tertiary recycling quality water (<_2 NTU) for irrigation use. The California Title 22 Water Recycling Criteria (WRC) accepted chlorination process will be used to disinfect the filtration effluent. The disinfected water is going to be discharged effeite-to . S4&4a. P1¢*G2 o H StrO ..V Wine Cup Motor Coach Resort WWTP Page 4 of 10 8/22/2007 Preliminary Design Report