再生水灌溉对土壤及浅层地下水中盐分的影响

Study on Effects of Reclaimed Water Irrigation on the Soil and Shallow Groundwater Salinity

为将阿拉尔市污水厂再生水进行合理的开发利用,本文研究了再生水灌溉生态林后土壤盐分的变化规律,同时通过模拟试验分析了灌溉后对浅层地下水含盐量的影响。研究表明,再生水中离子类型主要为氯化物、硫化物、碳酸氢盐类,阳离子类型为钠盐和钙盐型。总盐和离子含量与市政绿化水相比均较高;20 L灌水量时土壤积盐率最低,同时能够显著减少Cl-和Na+、SO42-的含量。与市政绿化用水相比再生水在整个灌水期内并未显著的提高土壤中盐分及各个离子的含量;灌溉3年后与市政绿化水相比除Na+含量较高外,其他离子含量均较低,再生水灌溉不会对地下水含盐量及有机物(COD含量)造成太大的影响。

In order to reasonable development and utilize the reclaimed water of sewage treatment plant in the City of Alar, the paper studied the variation of soil salinity ecological forest regeneration after irrigation, through simulation analysis of the impact on the shal- low groundwater salinity after irrigation. Studies have shown that the main types of renewable chloride ions in water, sulfide, bicarbon- ates, sodium and calcium cations of type. Total salt and ion levels were higher compared with the municipal green water; 20L irrigation amount of salt accumulation in soil lowest rates, while significantly reducing the Cl- and Na＋ , S0_4-2 contents. Compared with the municipal green water reclaimed water irrigation in the whole period did not significantly increase the content of soil salinity and various ions; except higher Na ＋ content, the other ion levels were low compared to three years after irrigation and municipal green water, recy- cled water for irrigation will not cause too much impact on the groundwater salinity and organic matter （COD content）.