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- Title
Treatment of Leather Industry Wastewater Using Coagulation, Ultraviolet/Persulfate Processing and Nanofiltration for Water Recovery.
- Authors
Ali Rıza Dinçer; Çifçi, Deniz İzlen; Karaca, Feriha
- Abstract
This study investigated water recovery with the treatment of leather industry processes wastewater (washing, pickling, and degreasing units) using coagulation, ultraviolet/persulfate (UV/PS) treatment, and nanofiltration processes. Coagulation studies were carried out using alum as the coagulant, and the highest chemical oxygen demand (COD) removal efficiency was obtained at pH 7 for all the wastewater. The highest COD and total organic carbon (TOC) removal were 80.9 and 50.5% in the wastewater washing unit ( : 8 g/L, pH 7) and 76.5 and 96.1% in the wastewater degreasing unit ( : 16 g/L, pH 6) using UV/PS oxidation, respectively. High COD and TOC removal could not be achieved with UV/PS oxidation in the wastewater pickling unit. In the studies performed with NP030 nanofiltration membrane after UV/PS oxidation, the highest permeability and COD removal was achieved at pH 7 under 4 × 105 Pa pressure in wastewater washing and degreasing units. After 75 min of nanofiltration at pH 7 in washing and degreasing units, the total filtrate amount was 39.8 and 42.3 L/m2 h, respectively. COD concentration in the wastewater washing unit decreased from 4434 to 138 mg/L, while it decreased from 5833 to 212 mg/L in the wastewater degreasing unit with coagulation, UV/PS processing, and nanofiltration. As a result, the treatment of leather industry wastewater through separate streams with coagulation, UV/PS, and nanofiltration, washing, and degreasing unit wastewater provides very high COD removal. Also, it has been shown impossible to treat the pickling unit wastewater by UV/PS oxidation.
- Subjects
LEATHER industry; COAGULATION (Sewage purification); NANOFILTRATION; SEWAGE; COAGULATION; CHEMICAL oxygen demand
- Publication
Journal of Water Chemistry & Technology, 2024, Vol 46, Issue 2, p176
- ISSN
1063-455X
- Publication type
Article
- DOI
10.3103/S1063455X2402005X