Open AccessPre-treatment potential of electro-coagulation process using aluminum and titanium electrodes for instant coffee processing wastewater
Author(s) -
Huy Hoang Phan Quang,
Hoan Nguyen Xuan,
Nhat Huy Nguyen,
Đức Đạt Đức Nguyễn,
Nguyễn Thị Ngọc Ánh,
Nguyen Thi Que,
Nguyễn Thị Thủy
Publication year - 2019
Publication title -
sustinere
Language(s) - English
Resource type - Journals
eISSN - 2549-1253
pISSN - 2549-1245
DOI - 10.22515/sustinere.jes.v3i3.87
Subject(s) - electrocoagulation , wastewater , chemical oxygen demand , effluent , pulp and paper industry , electrolyte , electrode , chemistry , sewage treatment , coagulation , supporting electrolyte , materials science , environmental science , environmental engineering , engineering , psychology , psychiatry
This study aimed at investigating the potential of electrocoagulation (EC) process using Al-Al and Al-Ti electrodes for the pre-treatment of instant coffee processing wastewater. Effects of various operating conditions, including cell voltage, time of treatment, inter-electrode distance, pH of solution, solution conductivity and agitation speed on the removals of chemical oxygen demand (COD) and color were considered. The maximum removal of COD and color was achieved at 87% and 99%, respectively, corresponding to COD and color in the effluents of 359-384 mg/L and 58-101 Pt-Co. Biodegradability of treated wastewater was significantly improved since BOD5/COD increased from initial value of 0.42 to 0.65 after treatment. Nether mixing nor adding of electrolyte was recommended. Moreover, the COD removal kinetics during EC process appeared to follow the first-order kinetic model. The operating costs were also determined as a reference for cost assessment of the treatment.