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The commonly used wastewater treatment technology is coagulation-flocculation. This method weakness is in high processing costs and large sludge volumes. The more effective alternative method is electrocoagulation. Electrocoagulation is a coagulation method using electric current through an electrochemical process. The working principle of electrocoagulation is the dissolution of anode metal (M+) which reacts to hydroxyl ion (OH-) to form coagulant. In this study, the treated integrated wastewater by electrocoagulation method using aluminium and stainless electrodes. This process was conducted in continuous where integrated wastewater was placed in electrochemical cells containing smart sensors. Parameters varied are smart sensor pH, total dissolved solid, total suspended solids, chemical oxygen demand, biological oxygen demand and heavy metals (Fe and Pb). The optimum conditions for the aluminum and stainless steel electrodes are 12 volt voltage and 150 minute process time. The results show that pH decrease until 6.52, TDS 340 mg/L, BOD5 14,2 mg/L, COD 52 mg/L, PO4 1.884 mg/L and heavy metal contents Pb 0.009 mg/L and Fe 0.18 mg/L. The result of this research has fulfilled the environmental quality standard.

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The purpose of this research is to determine the effect of variation of agitation speed on biogas production from palm oil mill effluent and cow dung as substrate by using modified digester fed-batch. The addition of agitation in the fermentation tank digester in this research to accelerate the contact between the microorganisms with the substrate so that the process runs more effectively. Thus biogas production with variations of agitation velocity have 90 and 102 rpm. The research is conducted by fed-batch that is the addition of substrate in fermentation tank as much as 1 liter for 2 days which aim to get optimum biogas production result. The results of this research indicate that the speed of agitation affects for biogas production. The optimum biogas production occurred at 102 rpm agitation speed after 30 days fermentation time was 26.5116% mol CH4.

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