Idaho Administrative Code
Title IDAPA 58 - Environmental Quality, Department of
Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS
Section 58.01.08.524 - FACILITY AND DESIGN STANDARDS: SURFACE WATER TREATMENT: DIRECT FILTRATION

Universal Citation: ID Admin Code 58.01.08.524

Current through August 31, 2023

Direct filtration, as used herein, refers to the filtration of a surface water following chemical coagulation and possibly flocculation but without prior settling. The nature of the treatment process will depend upon the raw water quality. A full scale direct filtration plant shall not be constructed without prior pilot studies which are acceptable to the reviewing authority. In-plant demonstration studies are required where conventional treatment plants are converted to direct filtration. Where direct filtration is proposed, an engineering report shall be submitted prior to conducting pilot plant or in-plant demonstration studies. See Subsection 501.19 for general information on conducting pilot studies. (3-24-22)

01. Filtration Requirements. (3-24-22)

a. Filters shall be rapid rate gravity filters with dual or mixed media. The final filter design shall be based on the pilot plant or in-plant demonstration studies, and all portions of Section 518 apply. Pressure filters or single media sand filters shall not be used. (3-24-22)

b. A continuous recording turbidimeter shall be installed on each filter effluent line and on the composite filter effluent line. (3-24-22)

c. Additional continuous monitoring equipment such as particle counting or streaming current metering to assist in control of coagulant dose may be required by the reviewing authority. (3-24-22)

02. Siting Requirements. The plant design and land ownership surrounding the plant shall allow for modifications of the plant. (3-24-22)

03. Redundancy. A minimum of two (2) units shall be provided for filtration such that plant capacity can be maintained with any component out of service for maintenance or repairs. (3-24-22)

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