基于沼液浓缩的液态有机肥利用现状与展望

Current research status and perspectives on liquid organic fertilizer utilization based on concentrating biogas slurry

厌氧发酵是解决有机废弃物处理与资源化利用的有效手段,然而发酵残余物——沼液的处理利用成为限制厌氧发酵技术发展的关键因素。沼液中富含养分及活性物质,可作为有机肥还田,在农田承载力和运输成本的双重约束下,沼液浓缩制肥技术迅速发展。沼液浓缩不仅可以减少储存和运输成本,还可以大幅度提高单位体积沼液中的养分含量,复配成高品质有机肥,分离后的水还可回用或达标排放。本文通过查阅文献,根据现阶段的沼液浓缩技术及浓缩液利用现状,分析了不同浓缩技术的优缺点及浓缩液制肥潜力,并对沼液的应用潜力提出了展望及建议。

Anaerobic digestion is an effective technique for treatment and resourceful utilization of organic wastes.However,treatment and utilization of biogas slurry is a substantial hurdle to further development of anaerobic digestion.Biogas slurry is rich in nutrients and active substances and can thereby be used as liquid organic fertilizer in agricultural production.Within the constraints of farmland carrying capacity and transportation costs,techniques for concentrating biogas slurry have been developed.Concentrating biogas slurry can reduce storage and transportation costs,and considerably increase unit nutrient content in high-quality organic fertilizer,and the separated water can be reused or discharged to suit local standards.This article discussed the advantages and disadvantages of different technologies for biogas slurry concentration and the potential for subsequent liquid fertilizer production.Perspectives regarding future advances in concentrating biogas slurry were also provided.