This literature review surveys the previous and current researches on the co-digestion of anaerobic processes and examines the synergies effect of co-digestion with cattle manure. Furthermore, this review also pays attention to different operational conditions like operating temperature, organic loading rate (OLR), hydraulic retention time (HRT), chemical oxygen demand (COD) and volatile solid (VS) removal efficiency and biogas or methane production. This review shows that anaerobic mono-digestion of cattle manure usually causing poor performance and stability. Anaerobic studies were generally performed under mesophilic conditions maintained between 35 and 37°C. Organic waste loading rate generally ranges from 1 to 6 g VS-COD L -1 day -1 stable condition in anaerobic digester. Generally, studies show that HRT for co-digestion of fruit-vegetables waste and industrial organic waste appears to exceed 20 days. However, the anaerobic co-digestion process is generally operated at HRT of between 10 and 20 days. VS and COD removal efficiency usually reaches up to 90 % due to codigestion with different type organic waste. Methane-biogas production is generally obtained between 0.1 and 0.65 L CH 4 -biogas g -1 VS.

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This study examined the treatability of leachate with the electrocoagulation process and its optimization using the response surface method. The three‐parameter optimization process and a 5‐level, 6‐replicate central composite design were included in the investigation on a set of 36 pieces created for the study. A second‐order full polynomial approximation model was applied to evaluate the results of the optimization studies, which were performed for the removal of chemical oxygen demand, total suspended solids, total organic carbon, total Kjeldahl nitrogen, and NH3‐N. When these parameters were compared, the appropriate working conditions obtained for current density and time were 20 mA cm−2 and 60 min, respectively, at pH 8. In this way, both pH adjustment and power costs were reduced.