Modified Jar Test Studies for Removal of Disinfection By-Products (DBPs) and Color Compounds from Groundwater

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by Mark Williams, (S.M.ASCE),
Badri Badriyha, (S.M.ASCE),
Shih-Chieh Tu,
Jamal Awad, (M.ASCE),
Massoud Pirbazari, (M.ASCE),

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water:

Abstract: A bench scale study using a modified jar test apparatus was conducted which assessed the effectiveness of ferric chloride and aluminum chlorohydrate (AC) for the simultaneous removal of color compounds and disinfection by-product precursors from a groundwater source. The effects of pre-oxidation of source water (using potassium permanganate) as well as the effects of cationic polymers were also examined. Source water used in this study had a total organic carbon (TOC) concentration of 3.43 mg/L, an average color of 50 PCU, and an average 24 hour total trihalomethane formation potential (TTHMFP) of 225 μ/L as CHCl3. Results of the study indicated that color compounds were readily removed (below 10 PCU) using moderate doses (30 mg/L) of both the iron and aluminum coagulants. A substantial reduction in color was measured when low doses of permanganate (∼0.5 mg/L) were used in conjunction with both AC and ferric chloride. Low doses of permanganate also resulted in substantial reductions in trihalomethane formation potential.

Subject Headings: Chloride | Water treatment | Groundwater | Trihalomethanes | Benchmark | Equipment and machinery | Recycling |

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