天然气净化厂污水回用绿化对土壤环境的影响研究

Impact of Greening of Wastewater Reuse from Gas Purification Plant on Soil Environment

以天然气净化厂采用厂内污水喷灌的草坪地为研究对象,分别采集0~20 cm、20~60 cm土层土壤,并测定其重金属及化学性质。采用Nemero综合污染指数法评价草坪地土壤重金属污染程度,对比草坪地和对照间土壤有机质、硫酸盐和硫化物含量。结果表明:草坪地土壤重金属和石油烃含量低于国家标准限值,Nemero综合污染指数小于1,污水回用绿化没有对厂区内土壤产生重金属和石油烃污染;污水回用绿化提高了草坪地土壤有机质含量,没有造成土壤硫化物污染。

This study takes lawn field that was sprayed by wastewater from gas purification plant as study object.The lawn field soil layer of 0~20cm and 20~60cm was collected respectively,and the heavy metal and chemical properties were determined.The Nemero comprehensive pollution index method was used to evaluate the degree of heavy metal pollution to lawn field soil.The content of organic matter,sulfate and sulfide in soil between lawn field and control were compared.The results showed that content of heavy metal and petroleum hydrocarbon in lawn field soil was lower than that in the national standard.The Nemero comprehensive pollution index was less than 1,and the greening of wastewater reuse did not generate heavy metal and petroleum hydrocarbon pollution to the in-plant soil.Greening of wastewater reuse has increased the soil content of organic matter in lawn field and has not caused soil sulfide pollution.