Department of Civil Engineering , Kansas State University , 2118 Fiedler Hall, 1701C Platt Streeet , Manhattan , Kansas 66506 , United States.
CDM Smith , 14432 SE Eastgate Way , Bellevue , Washington 98007 , United States.
Environ Sci Technol. 2019 Jul 2;53(13):7347-7354. doi: 10.1021/acs.est.8b06198. Epub 2019 Jun 18.
Concerns regarding ambient temperature operation, dissolved methane recovery, and nutrient removal have limited the implementation of anaerobic membrane bioreactors (AnMBRs) for domestic wastewater treatment. This study addresses these challenges using a pilot-scale gas-sparged AnMBR, with post-treatment recovery of dissolved methane and nutrients. Operating under ambient temperatures for 472 days, the AnMBR achieved an average effluent quality of 58 ± 27 mg/L COD and 25 ± 12 mg/L BOD at temperatures ranging from 12.7 to 31.5 °C. The average total methane yield was 0.14 ± 0.06 L-CH/g-COD fed, with 42% of the total methane dissolved in the permeate. Dissolved methane removal using a hollow fiber membrane contactor achieved an average removal efficiency of 70 ± 5%, producing effluent dissolved methane concentrations of 3.8 ± 0.94 mg/L. The methane recovered from gaseous and dissolved fractions could generate an estimated 72.8% of the power required for energy neutrality. Nutrient recovery was accomplished using coagulation, flocculation, and sedimentation for removal of sulfide and phosphorus, followed by a clinoptilolite ion-exchange column for removal of ammonia, producing effluent concentrations of 0.7 ± 1.7 mg-S/L, 0.43 ± 0.29 mg-P/L and 0.05 ± 0.05 mg-N/L. The successful integration of AnMBRs in a treatment train that addresses the critical challenges of dissolved methane and nutrients demonstrates the viability of the technology in achieving holistic wastewater treatment.
环境温度运行、溶解甲烷回收和养分去除等问题限制了厌氧膜生物反应器（AnMBR）在生活污水处理中的应用。本研究采用气体注入式中试规模 AnMBR 解决了这些挑战，对溶解甲烷和养分进行了后处理回收。该 AnMBR 在 472 天的运行时间内，在 12.7 至 31.5°C 的温度范围内，平均出水 COD 为 58±27mg/L，BOD 为 25±12mg/L。平均总甲烷产率为 0.14±0.06L-CH4/g-COD，其中 42%的总甲烷溶解在渗透物中。使用中空纤维膜接触器去除溶解甲烷，平均去除效率为 70±5%，产生的出水溶解甲烷浓度为 3.8±0.94mg/L。从气态和溶解相中回收的甲烷可产生估计为实现能量中性所需功率的 72.8%。通过混凝、絮凝和沉淀去除硫化物和磷，然后使用斜发沸石离子交换柱去除氨，实现了养分回收，出水的硫浓度为 0.7±1.7mg/L，磷浓度为 0.43±0.29mg/L，氮浓度为 0.05±0.05mg/L。AnMBR 在处理工艺中的成功整合，解决了溶解甲烷和养分的关键挑战，证明了该技术在实现全面废水处理方面的可行性。
