吉林省农村常用沼气发酵原料产气潜力及特性研究

STUDY ON THE BIOGAS PRODUCTION POTENCY AND CHAR ACTENISTICS OF RURAL RAW MATERIAL IN JILIN PROVICE

摘要:

本文报导了吉林省农村常用沼气发酵原料的产沼气潜力和特性。各种发酵原料产气量(升/公斤干料)表明:玉米秸为518,谷草为444.2,甜菜渣为415.6,大豆秸为336.3.向日葵秸为264.7,草炭为13.6,鸡粪为412.3,马粪为368.6,猪粪为362.6,牛粪为258.1,羊粪为164.5。畜粪类第一个月的产气量占总量的63—83%,农作物秸秆类中,草炭产沼气极少且集中在第一个月,除甜菜渣外,其它秸秆第一个月的为总量的53—63%,差别不大。甲烷含量在50%左右。发酵期内发酵液的pH变化情况是:畜粪类的没有明显下降且产气正常,草炭的pH基本无变化,为6.7—7.0,大豆秸、玉米秸,谷草、向日葵秸和甜菜渣的pH都下降,为4.5—5.05,除大豆秸外,其它秸秆原料都需调节pH,才能饮复产沼气。

Abstract:

The results of liogas production potency and characteristics of rural raw materials in Jilin province are reported in this paper. The volumes of biogas (L/Kg dry matter) produced by these raw materials as following: cornstalks-518, millet grass-444.2, feetroot residua-415.6, soybean stem-336.3, sunflower stem-284.7, peat-13.6, hen dung-412.3, horse dung-368.6, swine dung-362.6, cow dung-258.1 and sheep dung-164.5. The biogas production of animal manures of tainod in first month about 63-83% of Total. Among the kind of agricultural crop straw, the gas production of peat were least and centralized in first month, the gat production of other straws were obtained 53-65% of the total in firs month. there were a little differenece between them. Content of methane in biogas were 50% approximately. In fermentative period the PH of fermentative slurry were vaiable as following:the PH of animal munure as raw materials decreased a little and gas produced normally, the PH of peat as raw material were variable between 6.7—7.0, Sunflower stem, Cornstalk, millet grass, Sunflowor stem and beetroot residua decreased the PH to 4.5-5.05. During 1-2 week fermentative period and the gas reproduced again after adjucting the PH to neutral, but beside the soybean stem as raw material.