沼液的定价方法及其应用效果

Pricing method and application effects of biogas slurry

为了探索沼液的商品化,采用养分含量定价和应用效果定价2种方法确定了沼液的价格,并分析了沼液施用后对土壤基本理化性状的影响作用。结果发现:采用养分含量定价法得到的沼液价格为78.12元/m3,采用沼液应用效果定价法得到的沼液的价格为111.4元/m3;沼液的实际应用价值要明显高于其养分含量的市场价;沼液施用后可降低土壤容重,增加土壤孔隙度,增加土壤有机质、土壤全氮、土壤有效磷及有效钾含量,有利于土壤肥力的保持。

The conversion of biomass to biogas via anaerobic digestion can be used to obtain new energy for economic reasons dealing with the arising prices of a barrel of oil and for ecological reasons dealing with the sustainable use of our energy resources to minimize the impact of CO2 in the atmosphere.That process yields a gas constituted by a mixture of methane and CO2,but it also generates a solid-liquid effluent（for short： biogas slurry）that is rich in nitrogen,phosphorous and potassium that could be used as fertilizer for plant. Large scale biogas engineering generates massive biogas slurry fixedly and continuously.It is difficult to consume them environment-friendly by the owners of biogas engineering.This kind of circumstance not only hinders biogas engineering operation,but also could result in secondary environment pollution.How to consume biogas slurry environment-friendly have become one of the bottleneck problems that restricted the development of large scale biogas engineering in China.At the same time,organic fertilizer are becoming gradually short of the resources in China,so that the biogas slurry being used as fertilizer has important meanings not only for economic reasons dealing with saving fertilizer cost,ensuring biogas engineering operation,and promoting the recycling utilization of biomass resources,but also for ecological reasons dealing with the sustainable use of biogas to minimize the impact of greenhouse gases.Realizing the characters of biogas slurry,knowing the value of biogas slurry,and finding feasible pricing methods of them are all useful for the utilization of biogas slurry as a kind of merchandise.In order to explore the commercialization of biogas slurry,it is essential to find out the feasible pricing methods and to make sure the price of biogas slurry. Two pricing methods were applied to determine the price of biogas slurry in this paper.One method was based on nutrient contents of the biogas slurry.The nutrient contents of biogas slurry including organic matter（O.M.）,total nitrogen,total phosphorus,and total potassium were analyzed in laboratery,then figure out the total price base on the price of each element been sold in market.The other method was according to application effect of biogas slurry.A pot cole experiment including 6 treatments was conducted.When cole were harvested,the fertilizer amount equivalent biogas slurry applied was gained by calculate and analyses.Then figure out the total price base on the price of each element been sold in market. The results indicated that the price based on nutrient contents was 78.12 yuan RMB/m3,and the price according to application effects was 111.4 yuan RMB/m3. The effects of applying biogas slurry on soil properties were studied also.The results indicated that soil bulk density were reduced by using of biogas slurry;soil porosity,organic matter,total nitrogen,available phosphorus,and available potassium of soil were all increased by applying biogas slurry.