Assessing maximum soluble combined heavy metals not causing inhibition to brewery sludge in anaerobic wastewater treatment
by Nusara Sinbuathong; Sutha Khaodhiar
International Journal of Global Warming (IJGW), Vol. 25, No. 2, 2021

Abstract: The effect of varying the soluble concentration of cadmium (Cd), copper (Cu) and zinc (Zn) on methane production and chemical oxygen demand removal was systematically investigated to reveal the soluble combined heavy metal concentration and the mass of soluble combined heavy metals loading to microorganisms that cause anaerobic system malfunctions. The critical value of soluble combined metal concentration was proposed as a model allowing soluble combined metals to cause 20% inhibition and still provide protection for the process. The proposed equation to protect the anaerobic system was K = (Zn/32.7 + Cd/56.2 + Cu/31.8), where K is the maximum soluble combined metal concentration that cannot exceed 0.0038 mEq/L, and Zn, Cd, and Cu are the soluble combined heavy metal concentrations in wastewater measured in milligrams per litre. The mass of soluble combined metals loading to microorganisms cannot exceed 0.38 mEq/kg of mixed liquor volatile suspended solids (MLVSS). The soluble combined metals caused synergistic inhibition and caused system failure at concentrations exceeding 0.01 mEq/L or 1.0 mEq/kg MLVSS.

Online publication date: Sat, 23-Oct-2021

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