Integrated chemical coagulation with natural base coagulant – electro-proxone process and ultrafiltration membrane for treatment of compost leachate

Guilan Province compost leachate was treated utilizing a hybrid process including chemical treatment followed by electro-proxone and ultra filtration (UF). The effects of different parameters including ratio of natural / chemical coagulant (۱:۵, ۱:۱۵, ۱:۲۵), pH (۵-۸), time (۱۰-۹۰ min), ozone dose (۱۰-۹۰ mg L-۱), current intensity (۵۰-۵۰۰ mA), TMP (۰.۵-۳.۵ bar) and temperature (۲۰-۵۰ °C) on COD and turbidity removal were investigated. At optimum conditions of the coagulation process (Salvia hispanica mucilage/FeCl۳ = ۱:۱۵ and pH = ۶.۵), ۳۶.۱۹ % and ۵۶.۹ % removal efficiencies were obtained for COD and turbidity, respectively. Effluent from the chemical treatment went through. Results from the electro-proxone process showed that by increasing the current intensity from ۵۰ to ۳۵۰ mA, COD removal efficiency reaches form ۱۴ % to  ۷۹ %. By changing O۳ concentration from ۱۰ mg L-۱ to ۹۰ mg L-۱, COD reduction increased and reached from ۲۹ % to ۸۴ %. UF reactor was used for final polishment of the treated wastewater at the optimum TMP of about ۱.۵ bar and pH = ۷.۵. By increasing the temperature from ۲۰ °C to ۴۰ °C, permeation flux increased from ۷۶.۷ Lm-۲ h-۱ to ۱۰۴.۱ Lm-۲ h-۱. However, following the increase of the permeation flux, the removal efficiency of COD and turbidity decreased slightly to ۵۴ % and ۹۰ %, respectively. This study showed that the employed hybrid method is capable of treating the hardly biodegradable compost leachate and obtaining the environmental standards.

کلیدواژه ها:

Compost leachate ، E- proxone ، Salvia hispanica mucilage ، Wastewater treatment