摘要
提出一个吸附对有机物生物降解影响的数学模型．模型中考虑了有吸附剂存在下体系可能出现的四种降解类型．用从土壤中分离出的２，４－Ｄ降解菌株，在有土壤或沉积物存在下与２，４－Ｄ进行生物降解实验．在菌体浓度不变的情况下，估算和比较了３０℃时四种降解作用的速率常数．结果表明，吸附的２，４－Ｄ不被水中和吸附的细菌所利用；而水中的２，４－Ｄ则可被水中和吸附的细菌所降解．进一步分析认为，并非所有生物降解都受到吸附阻碍，一定条件下吸附可加快生物降解作用的进行．
A mathematics model was proposed to describe the effects of adsorptionof soil(sediment)on organic biodegradation rates of 2,4-D.Four kinds ofchemical-bacteria interactions have been considered:(1)bacteria in waterreacting with chemicals in water;(2)bacteria in water reacting withadsorbed chemicals;(3)adsorbed bacteria reacting with chemicals in waterand(4)adsorbed bacteria reacting with adsorbed chemicals. The degradingbacteria strain(pseudomonas sp.)was isolated from soil and adapted with2,4-D.Bacteria sorption on soil(sediment)was determined with the bacterialabeled P￣(32).The results showed that 2,4 -D adsorbed on soil(sediment)wasavailable neither to the bacteria in water nor to the bacteria on soil(sedi-ment).It could be drawn from the model that biodegradation is not bound tobe inhibited in the presence of adsorbent and it can be stimulated under cer-tain conditions.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1994年第1期87-97,共11页
Acta Scientiae Circumstantiae
