Abstract：In order to know the features of carbon source composition, nanofiltration-ultrafiltration membranes was used to determine fractionation of the molecular weight in wastewater carbon source. Then we studied the influence of molecular weight distribution on the carbon utilization by denitrifying phosphorous removing bacteria (DPB) and related treatment performance of wastewater in the anaerobic-nitrification-anoxic (A2N) process, by employing acidification method with different acidification time. The averaged concentration of the total organic carbon (TOC) in raw wastewater was (58.3±2.83) mg/L, among which there is an averaged concentration of the particulate organic carbon (POC) in (38.05±1.65) mg/L with 65.27% to TOC. The dissolved organic carbon (DOC) presents a "W" type distribution on the molecular weigh with ranges of less than 0.5kDa (Dalton). And the molecular in weight ranges of “bigger than 100kDa”, “10kDa~5kDa”, “1kDa~0.5kDa” and “less than 0.5kDa” has contributed 36.20%, 12.05%, 13.68% and 36.20% to the total DOC, respectively. Acidification time has significantly impact on the allocation between POC and DOC. A 12-h acidification could effectively transformed POC to DOC, reaching a balanced concentration of 14mg/L. DOC decreased with increased acidification time. Best quality of carbon sources was expected at 8h, when DOC in low molecule weight organic matter (LMWOM, <1kDa) was 17.30mg/L. As a result, carbon utilization rate of DPB sludge in anaerobic tank and anoxic tank were 83.48% and 79.59%, increased by 23.56% and 18.03% from the 0-h acidification time, respectively. Meanwhile, the removal rate of total nitrogen (TN) and total phosphorus (TP) increased by 14.63% and 16.98%, respectively.
刘祥, 何成达, 刘雯, 朱亮. 原水碳源分子量分布及DPB效能对酸化时间的响应[J]. 中国环境科学, 2015, 35(3): 797-803.
LIU Xiang, HE Cheng-Da, LIU Wen, ZHU Liang. Responses of the molecular weight distribution of raw water carbon source and DPB function to acidification time. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(3): 797-803.
