Water Conservation, Reuse, and Recycling Proceedings of an Iranian-American Workshop (2005) / Chapter Skim
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Pages 187-198
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187 Monterey County Water Recycling Projects: A Case Study James Crook and Robert S Jaques INTRODUCTION The Monterey Regional Water Pollution Control Agency (MRWPCA)
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188 FI G U R E 1 Sc he m at ic o f t he w at er re us e co nc ep t.
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MONTEREY COUNTY WATER RECYCLING PROJECTS: A CASE STUDY 189 pathogenic organisms were detected in the reclaimed water, and spray irrigation with reclaimed water did not adversely affect soil permeability, did not result in heavy metal accumulation in the soil or plant tissue, and did not adversely affect crop yield, quality, or shelf life. The 114,000 cubic meters per day (m3/d)
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190 WATER CONSERVATION, REUSE, AND RECYCLING In order to conform to California's water reuse criteria, both treatment trains were required to have a chlorine residual of at least 5 milligrams per liter (mg/l) after a minimum chlorine contact time of 90 minutes.
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MONTEREY COUNTY WATER RECYCLING PROJECTS: A CASE STUDY 191 Nonrestricted recreational impoundments • ≤2.2/100 ml • Secondary • ≤23/100 ml in more • Coagulation than one sample in • Clarificationi any 30-day period • Filtrationh • 240/100 ml • Disinfection (maximum) aBased on running 7-day median.
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192 WATER CONSERVATION, REUSE, AND RECYCLING Several baseline studies were carried out prior to the start of the five-year field demonstration phase of the MWRSA study to ascertain the uniformity of the soil on the site of the experimental plots and to assure the safety of downwind areas from windblown aerosols during irrigation with reclaimed water. The sampling program included the following: • Sampling for metals and other chemicals included composite samples of each water type taken over a 3-day to 5-day period during each irrigation event.
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MONTEREY COUNTY WATER RECYCLING PROJECTS: A CASE STUDY 193 secondary treatment, low dose coagulant/polymer addition, filtration, and disinfection) , although both treatment trains reliably removed or inactivated more than 5 logs of virus during seeding experiments.
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194 WATER CONSERVATION, REUSE, AND RECYCLING between plants irrigated with reclaimed water and well water. Heavy metal concentrations in the three types of irrigation waters are shown in Table 2.
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MONTEREY COUNTY WATER RECYCLING PROJECTS: A CASE STUDY 195 Respondents to the market study recommended that response to rumors that might occur regarding produce irrigated with reclaimed water should include clear, government-endorsed fact sheets and that support be given to developing an educational information program on the use of reclaimed water for crop irrigation. Field Worker Health: The health status of each person assigned a field task during the field study was monitored through frequent questionnaires and initial and exit medical examinations.
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196 WATER CONSERVATION, REUSE, AND RECYCLING TABLE 3 Treatment Process Design Criteria and Effluent Quality Requirements Item Value Design flows Average daily flow (mgd) 29.6 Average daily flow (m3/s)
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MONTEREY COUNTY WATER RECYCLING PROJECTS: A CASE STUDY 197 vate pathogens that might be present in the influent wastewater. Samples were collected and analyzed during the 1997 to 1999 timeframe.
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198 WATER CONSERVATION, REUSE, AND RECYCLING SUMMARY The total capital cost of the Monterey County Water Recycling Projects was approximately $78 million. The total cost to treat and deliver reclaimed water to agricultural areas is estimated to be approximately $0.19/m3 ($225/acre-foot or $0.90/1,000 gallon)
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