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 (1:5, 1:15, 1:25), pH (5-8), time (10-90 min), ozone dose (10-90 mg L-1), current intensity (50-500 mA), TMP (0.5-3.5 bar) and temperature (20-50 °C) on COD and turbidity removal were investigated. At optimum conditions of the coagulation process (Salvia hispanica mucilage/FeCl3 = 1:15 and pH = 6.5), 36.19 % and 56.9 % 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 50 to 350 mA, COD removal efficiency reaches form 14 % to  79 %. By changing O3 concentration from 10 mg L-1 to 90 mg L-1, COD reduction increased and reached from 29 % to 84 %. UF reactor was used for final polishment of the treated wastewater at the optimum TMP of about 1.5 bar and pH = 7.5. By increasing the temperature from 20 °C to 40 °C, permeation flux increased from 76.7 Lm-2 h-1 to 104.1 Lm-2 h-1. However, following the increase of the permeation flux, the removal efficiency of COD and turbidity decreased slightly to 54 % and 90 %, respectively. This study showed that the employed hybrid method is capable of treating the hardly biodegradable compost leachate and obtaining the environmental standards.

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

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