Depending on the properties of wastewater, acidification is sometimes required in pretreatment. In the presence of FOG, when acid (e.g., concentrated H2SO4) is added into the acidification tank, organics will be hydrolyzed, which improves biotreatability. Grove et al.12 designed a treatment system using nitric acid to break the grease emulsions followed by an activated sludge process. A BOD5 reduction of 99% and an effluent of <12 mg/L were achieved at a loading of 40 lb BOD5/ 1000 ft3 and a detention time of 87 h. The nitric acid also furnished nitrogen for proper nutrient balance for the biodegradation.
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.