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Wastewaters generated by domestic laundry processes contained a considerable amount of mineral oils, heavy metals, and other toxic chemicals that can damage the aquatic ecosystems if discarded without treatment. In this paper, the domestic laundry wastewater was treated by electrocoagulation (EC) process. EC reactor was cylindrical with a volume of 70 L and operated continuously at a fixed flow rate of 500 mL/min. The influence of current strengths and aluminum (Al) electrode configurations on EC performances were investigated. It was found that the Al electrode configuration of 3 anodes 1 cathode, which were operated at a current strength of 6 A, provided preferable results compared to the other configurations. The reductions of COD, surfactant, TDS, and turbidity were 80.76%, 27.11%, 17.66%, and 74.12%, respectively.

Wastewater reclamation and reuse have become an alternative to saving operational costs while reducing the impact of waste pollution. In this paper, integration of electrocoagulation (EC) and polysulfone-based ultrafiltration (UF-PSf) membranes were used for the mentioned purpose. The EC unit equipped with 7 (seven) pieces of E-shaped of Al electrodes, which operated at a current of 3 (three) Amperes and a residence time of 2 (two) hours. The waste samples obtained from textile and oil palm industries. The experimental results were compared based on product quality and economic feasibility. When used for textile waste treatment, the integrated EC-UF units reduced TDS, TSS, BOD, and COD by 77%, 95%, 70 -80%, and 60-70%, respectively. While in palm oil waste treatment, the TDS and TSS reduced by 92% and 98%. The electrode loss rate in palm oil waste treatment was 2 (two) times greater than textile waste. By assuming that the waste production capacity of both industries was 400 m3/day, the water production cost in textile waste treatment was Rp. 4,000/m3. While in the palm oil waste treatment, the water production cost was Rp. 6,000/m3. These results showed that the EC-UF unit could be used as an economical and environmentally friendly alternative process for reclamation of industrial wastewater that meets the clean water quality standards.

In this research, composite polyvinyl chloride ultrafiltration (PVC-UF) membrane was used for peat water treatment. The UF membrane was prepared by mixing polyvinyl chloride (PVC), polyethylene glycol (PEG400), ZnO, acetone, and N-dimethylacetamide (DMAC). The concentration of PVC was varied from 10 to 14 wt.%, while the PEG400 was varied from 0 to 15 wt.%. The concentration of acetone and ZnO was fixed at four (4) wt.% and two (2) wt.%, respectively. Immersion precipitation method was used to form the membrane structure. The experimental results showed that higher humic substance rejection (>50%) was achieved when 12 wt.% PVC and 10% wt.% PEG was added into the polymer solution. The permeate flux of the membrane was above 100 L/m−2h−1.Higher rejection of humic substances was obtained at an operating pressure of 30 psig.