1. New insights into pollutants removal, toxicity reduction and microbial profiles in a lab-scale IC-A/O-membrane reactor system for paper wastewater reclamation
- Author
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Shengdao Shan, Lifeng Ping, and Zhuang Haifeng
- Subjects
Paper ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Nitrogen ,Daphnia magna ,Ultrafiltration ,Industrial Waste ,Wastewater ,010501 environmental sciences ,Waste Disposal, Fluid ,01 natural sciences ,Water Purification ,Bioreactors ,Animals ,Environmental Chemistry ,Waste Management and Disposal ,Effluent ,0105 earth and related environmental sciences ,Biological Oxygen Demand Analysis ,Pollutant ,Membrane reactor ,biology ,Chemistry ,Chemical oxygen demand ,Membranes, Artificial ,biology.organism_classification ,Pulp and paper industry ,Pollution ,Acute toxicity ,Daphnia ,Water Microbiology ,Filtration ,Water Pollutants, Chemical - Abstract
In this study, an internal circulation-anoxic/aerobic (IC-A/O) process followed by ultrafiltration (UF) and reverse osmosis (RO) system was applied for paper wastewater reclamation. The IC-AO system presented a stable and efficient performance, achieving high removal of chemical oxygen demand (COD), total organic carbon (TOC) and total nitrogen (TN) with methane production rate of 132.8 mL/d. Acute toxicity to Daphnia magna (D. magna) was reduced significantly (83.2%) and the spearman's rank correlation analysis indicated that the toxicity of effluents from each reactor were positively correlated with COD and TOC. Hexadecanoic acid, octadecanoic acid and benzophenone were the main toxic contributors for biological effluent. Microbial community revealed that Anaerolinea was significantly related with organic pollutants. The UF-RO system further removed pollutants and toxicity with the final effluent COD, TOC, ammonium nitrogen (NH4+-N) and TN of 32.6, 18.8, 0.3 and 9.2 mg/L, respectively, which proved that it was feasible for paper wastewater reuse. This study presented an efficient, practical and environmentally competitive system, and paved a foundation for the treatment and reuse of paper wastewater.
- Published
- 2019