Reconsidering operation pattern for cation-exchange resin assistant anaerobic fermentation of waste activated sludge: Shorting residence period towards dosage-reduction and anti-fouling.

Short-chain fatty acids (SCFAs) generation through anaerobic fermentation has been regarded as a promising pathway to achieve carbon recovery and economic benefits in waste activated sludge management. Despite the cation exchange resin (CER) assistant anaerobic fermentation strategy has been previously reported for enhancing anaerobic fermentation, the overlarge CER usage and serious CER pollution have limited its engineering application. This study provided a reconsideration for the operation pattern modification. Through 4-day anaerobic fermentation with CER residence period shrinking to 1 day, 40.9% sludge VSS solubilization and reduction were achieved, triggering a considerable sludge hydrolysis rate of 28.4%. Thereby, SCFAs production was improved to 264.8 mg COD/g VSS. Such performances were approximately 80.2-87.8% of those with conventional CER residence period (8 days). The organic composition distribution and parallel factor analysis demonstrated that similar biodegradability and utilizability of fermentative liquid were achievable with various operation patterns. Compared with the conventional operation pattern, the modified operation pattern with shortened CER residence period (1 day) also displayed satisfying anaerobic fermentation efficiency and numerous engineering bene fits, e.g. decreased CER usage, reduced engineering footprint, relieved CER fouling, and increased operation convenience. The findings might provide sustainable development for CER assistant anaerobic fermentation strategy and enlighten the direction of anaerobic fermentation process.

Community-based Rehabilitation Service Based on the Internet and Information Technology / 中国康复理论与实践

Community-based rehabilitation (CBR) is positioned to provide various strategies for people with disabilities for achieving the embracing development of the community. CBR is also the terminal of the three-level rehabilitation service system. This paper analyzed the status of domestic community-based rehabilitation based on the document, discussed the possible problems referred to the international concepts about CBR, and suggested a new service pattern of CBR based on the internet and information technology.