摘要
采用从城市污水处理场活性污泥中培养的混合菌种,研究了苯甲酸、邻一、间一、对-苯二甲酸的生物降解。考察了在50,200,400和600mg/l四个浓度梯度下,四种化合物的浓度与生物降解性的关系。研究了苯环上不同羧基数量和取代基位置不同所表现出的降解难易程度上的差异。研究结果表明,在试验周期内,上述四种化合物均有不同程度的降解,四种化合物的可降解性为:邻-苯二甲酸>苯甲酸>对-苯二甲酸>间-苯二甲酸,在评价实验体系的降解性时引入了体系中细菌对化合物的负荷(mg·l^(-1)/个·ml^(-1)),使采用不同菌种量、不同化合物浓度的不同实验装置的研究结果有了相对的可比性。
A mixed culture from activated sludge of municipal wastewater treatment plant was collected and accumulated. Four organic compounds, benzole acid('BA), o-phthalic acid(o-PTA), m-phthalic acid (m-PTA) and p-phthalic acid(p-PTA),were selected to study their biodegradability at the concentration of 50, 200, 400 and 600mg/l under aerobic condition in the rotating shaker at 20℃. The ratio of compounds concentration to cells concentration introduced to evaluated the results of the test. The results showed that these compounds could be degraded within the duration of the test. The biodegradability of the four compounds are in the order of. o-PTA>BA> p-PTA>m-PTA. It was found that the position and number of carboxyl groups on benzene nucleus caused the difference in biodegradability of the compounds.
出处
《环境化学》
CAS
CSCD
北大核心
1993年第3期173-178,共6页
Environmental Chemistry
