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Treatment of wood industry wastewater by combined coagulation–flocculation–decantation and fenton process
Author(s) -
Azimi Seyyedeh Cobra,
Shirini Farhad,
Pendashteh Alireza
Publication year - 2021
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/wer.1441
Subject(s) - decantation , turbidity , flocculation , wastewater , chemistry , response surface methodology , alum , coagulation , pulp and paper industry , chemical oxygen demand , central composite design , chloride , environmental engineering , chromatography , environmental science , geology , organic chemistry , psychology , oceanography , psychiatry , engineering
In the present research, the efficiency of turbidity and chemical oxygen demand (COD) reduction from the wood industry wastewater (WIW) by the use of a combined coagulation–flocculation–decantation (CFD) – Fenton process was studied. Firstly, the performance of three coagulants such as ferric chloride (FeCl 3 ), aluminum sulphate (alum), and polyaluminum chloride (PACl) was evaluated. The polyacrylamide (PAM) was used as a flocculant. The results showed that the polyaluminum chloride had a high removal efficiency. The COD reduction of 84.1% and turbidity removal of 82.0% of were obtained in coagulation–flocculation–decantation (CFD). Secondly, Fenton process was optimized, by the use of a response surface methodology (RSM), with application of a central composite design (CCD). The maximum turbidity and COD removal obtained by this process were 94.1% and 72.5% respectively, under optimal conditions ([Fe 2+ ] = 250 mg/L, [H 2 O 2 ] = 500 mg/L, pH 3.5, time 60 min). The kinetics of COD and turbidity removal were determined by the model of first order. In conclusion, the combination of coagulation–flocculation–decantation (CFD) – Fenton process presented as a remarkable method for wood wastewater treatment. Practitioner points A combination of coagulation–flocculation–decantation and Fenton process was introduced for the wood industry wastewater treatment. A designed experimental approach for treatment of wood industry wastewater using a Fenton process was studied. The yields of COD, BOD 5 , N‐NO 3 , P‐PO 4 , and dye removal were obtained according to the standard limits in Iran.