污泥基生物炭提升活性污泥系统处理性能

对污泥基生物炭提升活性污泥系统处理性能进行探讨,将活性炭和污泥基生物炭分别投入A²O工艺厌氧池活性污泥,发现其对COD削减率最高分别为72.9%和41.1%,均能有效削减,生物炭对TN削减率最高为74.1%,优于活性炭.表征显示污泥基生物炭上更易附着活性污泥且比表面积更大.在A²O小试厌氧池中以"1次/污泥龄"为频率投加活性炭、污泥基生物炭和脱脂污泥基生物炭,结果发现:投加污泥基生物炭对COD、TN、TP的削减均优于活性炭,投加脱脂污泥基生物炭对COD、TN的削减与投加活性炭相当,对TP平均削减率高达85.6%,优于活性炭,表明生物炭处理(BT)工艺比粉末活性炭处理(PACT)工艺处理生活污水能力更强,脱脂污泥基生物炭作为污泥脂质提取后的副产品更经济.

Sludge-based biochar enhances treatment performance of activated sludge systems

This study investigates the sludge-based biochar to enhance the treatment performance of activated sludge systems. The highest COD reduction rates of 72.9% and 41.1% were found for activated carbon and sludge-based biochar, respectively, into the activated sludge of anaerobic tank in the A²O process. The highest reduction rate of TN was 74.1%, which was more effective than that of activated carbon. Characterization showed that activated sludge was more easily attached to sludge-based biochar and had a larger specific surface area. Activated carbon, sludge-based biochar and defatted sludge-based biochar were added in the anaerobic tank of A²O pilot plant at the frequency of one addition per sludge age. The results showed that adding sludge-based biochar had better reduction effect on COD, TN and TP than adding activated carbon. Compared with the addition of activated carbon, adding defatted sludge-based biochar had little difference in COD and TN reduction, but the average reduction rate of TP was 85.6%, which was more effective than that of activated carbon. In conclusion, biochar treatment (BT) process is more powerful than powdered activated carbon treatment (PACT) process in treating domestic sewage, and defatted sludge-based biochar is more economical as a by-product of sludge lipid extraction.