污灌前后土壤理化性质变异规律的研究

Variation of Soil Physical and Chemical Properties of Sewage Irrigation

以人工模拟湿地作为研究对象,利用氯苯、对氯甲苯2种废水对其进行污灌,经过一定的时间后对湿地土壤的理化性质进行研究并加以对比,总结出污灌后土壤理化性质的变异规律。研究表明:经过一段时间的污水处理,污水中的某些成分可能会影响一部分的土壤颗粒的结合状态,但并未改变土壤质地的类别;实验用来污灌的污水中不含有一般综合性污水中所含有的钠盐、镁盐等,同时又存在着土壤的淋溶作用,使得污灌前后土壤中的水溶性盐的含量是减少的;污水处理前后土壤的pH值是先减小再增大的,但均属于弱碱性;土壤含水率的变化正好与pH值的变化特征相反,呈现出先增大再减小的趋势。只是2组平行实验的增大或减小的幅度不一致。

Chosing artificial wetland as the research object, using chlorobenzene and chlortoluence wastewater as the irrigation wastewater, after a certain period of time, the physical and chemical properties of soil in wetland were studied . Contrast was made of the wastewater before and after irrigation and the variation law of soil＇s physical and chemical properties were summed up. The results showed that： after a period of sewage treatment, some components of sewage may affect the combination state of part of the soil particles, but did not change the soil texture categories; the wastewater used to irrigate did not contain Na-salt, Mg-salt, etc., which was different from general comprehensive wastewater, at the same time there was soil eluviation, which made the wastewater irrigation and water soluble salt content of the soil reduced; during sewage treatment, soil pH value first reduced and then increased, but was weak alkaline all the time; soil moisture changed in the opposite trend, which first increased and then decreased. But during＂ the two sets of parallel experiments, the increasing and decreasing range was different.