As for the problems of biogas slurry, such as its large amount, difficulties in disposal, storage, transport and low nutrients, the reverse osmosis (RO) technology concentrating the biogas slurry were put forward in this paper. The concentrating effect was investigated,and the quality of permeated liquid was analyzed. The results showed that the effect of the slurry concentrating by reverse osmosis technology is excellent. The concentrating effect in conductivity, COD, NH3-N were all more than 9O%, and the permeated liquid of the RO system could meet the standard for recycle use. Besides, through the tests of agricultural indicators, it was found that the nutrients of concentrated slurry was 4 times as that in the original slurry,so that the application of concentrated slurry can achieve the equivalent effect of regular fertilizer. Simultaneously, the concentrated slurry has advantages in controlling pest,promoting crop growth, increasing crop yield. Therefore,it has the potential for further commercial use.%文章针对沼气工程中沼液产量大、处理成本高、储存运输困难和营养物质含量偏低等问题,提出采用高耐污反渗透技术对沼液进行浓缩的建议.实验分析了沼液的浓缩效果,考察了浓缩后透过液水质.实验结果表明,反渗透技术对沼液浓缩效果良好,对电导率,COD,NH3-N的浓缩效果达90％以上,透过液水质能够达到调浆等回用标准.通过对浓缩液农用指标的测试发现,浓缩液所含营养物质是原液的4倍,可以实现普通肥料等效施用效果,并在病虫害防治、促进作物生长、提高作物产量方面具有优势,有进一步商业化利用的潜力.
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