摘要
取徐州奎河的生活污水进行饱和灌溉实验，由埋设在田间的一对蒸渗仪（地下水位保持在１ｍ）观测，结果表明：污水中含量高达５．３５ｍｇ／Ｌ的氨氮进入土壤后，大部分被土壤胶体所吸附，迁移能力差，一般不会直接污染地下水。但污水在下渗时，能淋溶土壤中积存的ＮＯ－２和ＮＯ－３离子，使它们在地下水中的含量迅速增加。污灌以后，随土壤含水量、氧化还原电位和ｐＨ值的变化，氨化作用、硝化作用和反硝化作用依次成为氮素转化的主要机制。污灌１０ｄ之内，由于淋溶和硝化作用产生的ＮＯ－２、ＮＯ－３会造成浅层地下水的严重污染。
The saturated irrigation tests were carried out in a couple of lysimeters (the levels of groundwater are all 1m) built in the field of Huaibei Plain. The irrigating water was taken from Kui river of Xuzhou. The results obtained are summarized as follows: Although ammonium-N is as high as 5 35mg/L in the wastewater , it con′t pollute the groundwater directly when waste water irrigates it in the soil in a normal condition, because ammonium-N is sorbed mainly by soil colloids and is difficult to move. When wastewater moves down, it leaches washing nitrite and nitrate that have accumulated in the soil, and makes their concentrations increase rapidly. After irrigating, with the variation of moisture, oxygen and pH value, the ammonification, nitrification and denitrification are successively the major causes of nitrogen trasformation in the soil. During ten days of irrigation, NO - 2 and NO - 3 arisen from leaching and nitrification bring about serious pollution in the shallow groundwater.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
1997年第2期183-188,共6页
Advances in Water Science
关键词
污水灌溉
三氮
土壤
地下水污染
wastewater irrigation
three types of nitrogen
soil
groundwater.
