화학공학소재연구정보센터
Chemical Engineering and Processing, Vol.119, 131-139, 2017
Effective biodegradation of organic matter and biogas reuse in a novel integrated modular anaerobic system for rural wastewater treatment: A pilot case study
To meet the various requirements of rural/decentralized wastewater treatment in China, a novel integrated anaerobic system was developed, in the combination of anaerobic digestion and membrane filtration processes. In this study, a pilot-scale system, consisting of an anaerobic chamber, an equalization chamber and an anaerobic membrane chamber was investigated, in terms of the organic matter removal, nutrients removal, biogas production and power consumption. Pilot trials reflected that at both maximum design flowrate of 3 m(3)/d and shock flowrate of 5 m(3)/d, Chemical Oxygen Demand (COD) concentration in the influent was generally greater than 300 mg/L; its removal efficiency exceeded 80%. The removal efficiencies of total nitrogen (TN) and total phosphorous (TP) was of 33 +/- 14% and 25 +/- 6%, respectively; whereas minor increase of ammonia and phosphate in the permeate effluent. Daily produced biogas increased from 40 to 170 L/d during the trials, and the estimated mean biogas yield coefficient was 0.14 +/- 0.04 m(3)biogas/kgCOD(removed) (35 +/- 3 degrees C. Promising power consumption was expected to be lower than 0.5 kW h per ton of water production when operated below the maximum design flowrate. This integrated system provides a good alternative for rural wastewater treatment, which has the potential to become a sustainable and green process.