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Wastewater reclamation at Lake Arrowhead, California: an overview

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A demonstration pilot study was conducted in Lake Arrowhead, Calif., to determine the feasibility of reclaiming municipal secondary effluent for indirect potable reuse and stabilizing the lake level during periods of extended drought. The lake, which is the sole drinking water source for the community, was severely affected during the long drought from 1985 to 1991. A 12 000-L/d pilot plant was constructed and tested for nearly 3 years. The pilot plant included denitrification followed by alum coagulation/flocculation/sedimentation, sand filtration, primary ozonation, granular activated carbon (GAC) filtration, ultrafiltration (UF)/nanofiltration (NF), reverse osmosis (RO), and final ozone disinfection. A comprehensive analytical testing program was devised to monitor product water quality as well as to compare it with the lake water. Phosphorus and turbidity in the product water were consistently below detection limits (0.02 mg/L and 0.1 nephelometric turbidity unit [NTU], respectively). Product water total organic carbon (TOC) and conductivity levels were 1–2 mg/L and 20–40 μMho/cm, respectively, which were approximately 25%–50% and 30%–50% of the lake concentration. Challenge testing revealed nearly complete removal of pathogenic material (an approximate 21–22 log removal of bacteriophage and 8–10 log removal of Giardia and Cryptosporidium). Trace organic chemical analysis of volatile and base neutral organic compounds indicated that it is possible to produce reclaimed water that is superior to the lake water. Only nitrogen (N) removal did not meet expectations for the entire period. It is anticipated that better process control will ensure meeting the nitrogen product water goals for full-scale treatment.
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Keywords: INDIRECT POTABLE REUSE; NANOFILTRATION; NUTRIENT REMOVAL; OZONE DISINFECTION; REVERSE OSMOSIS

Document Type: Research Article

Publication date: 1997-05-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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