Arsenic Removal from Combined Runoff and Wastewater

The feasibility of removing hazardous soluble arsenic (+5) and other conventional pollutants from combined storm runoff and process wastewater by oil/water separation, dissolved air flotation (DAF), filtration, and granular activated carbon (GAC) adsorption was fully demonstrated for an oil-blending company in New Jersey [44,45,52]. The oil separated from the raw combined wastewater by the American Petroleum Institute (API) oil/water separators was

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HXH ilia

Figure 18 Optimum process configuration (from Ref. 51).

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Figure 18 Optimum process configuration (from Ref. 51).

virgin and therefore skimmed off, dried, and reused. The oil/water separator effluent containing 1.01 mg/L of arsenic, 3 NTU of turbidity, 50 units of color, 28.5 mg/L of oil and grease (O&G), and 83 mg/L of chemical oxygen demand (COD) was fed to a DAF clarifier for removal of arsenic by 90.1%, turbidity by 30%, color by 43%, O&G by 43.2%, and COD by 32.5%. Either ferric chloride or ferric sulfate was an effective coagulant for arsenic removal.

The same oil/water separator effluent was also successfully treated by a DAF-filtration clarifier. Reductions of arsenic, turbidity, color, O&G, and COD were 90.6, 93.3, 98, 74.7, and 51.8%, respectively. Although DAF and DAF-filtration both proved to be excellent pretreatment processes, granular activated carbon (GAC) post-treatment removed 100% of soluble arsenic. Table 9 [44,45,52] presents some important operational data generated at the oil-blending company.

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