摘要
本实验选取了苯酚、苯甲酸、苯、甲苯、氯苯等五种化合物作为活性污泥的驯化基质，以瓦呼仪作为测试手段，分析了五种基质在驯化后的活性污泥中的可降解性及三氯乙烯（TCE）在不同基质驯化后的活性污泥中的可生化性，并用计算出的12h有机物氧化率表征有机物的可生化性难易度。苯酚、苯甲酸、甲苯、苯在40mg／L时的氧化率达到最大值，分别为93．71％、64．67％、39．24％、9．15％。氯苯仅在20mg／L时可降解，氧化率为46．09％，据此推断出几种代谢基质的可降解性从易到难的顺序为：苯酚〉苯甲酸〉甲苯〉苯〉氯苯。在甲苯、苯酚、苯甲酸、氯苯驯化后的活性污泥中TCE在50μg／L时，其氧化率达到最大值，分别为54．14％、33．69％、23．91％、21．11％。在苯驯化后的活性污泥中TCE仅在10μg／L时可降解，氧化率为13．8％。据此可推断出TCE在五种代谢基质中的可生化性从高到低的顺序为：甲苯〉苯酚〉苯甲酸〉氯苯〉苯。
In this study, phenol, benzoic acid, benzene, toluene and chlorobenzene are used as acclimated substrates in an activated sludge system. The biodegradability of the five acclimated substrates and that of trichloroethylene （TCE） are conducted by measuring oxygen consumption with Warburg respirometer. The biodegradability parameter is expressed with bio-oxidation ratio in twelve hours. The oxidation ratio of phenol, benzoic acid, toluene and benzene at 40 mg/L is up to the maximum and they are 93.71%, 64.67%, 39.24% and 9.15% respectively. But chlorobenzene can be degraded only at 20 mg/L and its oxidation ratio is 46.09%. Based on this, the biodegradability relationship of the five compounds is concluded, phenol 〉 benzoic acid 〉 toluene 〉 benzene 〉 chlorobenzene. TCE biodegradability ratio for TCE concentration of 50 μg/L, by acclimated sludge using toluene, phenol, benzoic acid and chlorobenzene as substrates, reached the maximum and they are 54.14%, 33.69%, 23.91% and 21.11% respectively. While in benzene acclimated sludge, TCE can be degraded only at 10 μg/L and its oxidation ratio is just 13.8%. Then TCE biodegradability relationship by the five acclimated sludge is as follows： toluene 〉 phenol 〉 benzoic acid 〉 chlorobenzene 〉 benzene.
出处
《地质调查与研究》
2006年第1期69-75,共7页
Geological Survey and Research
基金
国家自然科学基金资助项目（40102027）.
关键词
三氯乙烯(TCE)
可降解性
瓦呼仪
trichloroethylene （TCE）
biodegradability
aerobic degradation
Warburg respirometer
