Research On Anaerobic Co-digestion Of Mushroom Cultivation Wastes And Pig Manure

The utilization ratio of mushroom cultivation wastes is extremely low in our country,except a few is applied in the animal feed, land fertilizer and circulation cultivation, most aredirectly abandoned or burned, not effective use of resources, meanwhile,the pollution to thesurrounding environment cannot allow to ignore. Mushroom wastes mainly consist of thesawdust, the cotton seed shell and straw, as a kind of the synthesis of lignocellulose body, butthe difference is that in the mushroom growth process it can help degrading bacteria in thelignin, cellulose and hemicellulose of the wastes and relative to straw kind of fermentationmaterials it is more advantageous to the microbial degradation of absorption, it is a kind ofideal biogas fermentation materials.This research investigate the characteristics of Anaerobic Co-digestion of three kinds ofmushroom cultivation wastes and the Pig Manure on the Biogas production, and preferentiallydelve into the characteristics of Lentinus edodes wastes on the Biogas production, andaccording to the problem that woodiness cellulose of the material are too high, apply biogasslurry to pretreat the fermentation materials; According to the problem that the C:N ofLentinus edodess cultivation wastes is too high, add proper Pig Manure to improve the biogasproduction rate.This main research contents and conclusion are as follows:(1)The research on the characteristics of Lentinus edodes cultivation waste, Plemtuseqngiu cultivation waste and oyster mushroom cultivation waste on the Biogas production.The result shows that they possess good gas production potential. Lentinus edodes cultivationwaste as single anaerobic digestion raw material has total biogas production of17918.0ml,with TS gas production of149.3ml/g,with daily biogas production of664.1ml, with averagemethane content of47%; Plemtus eqngiu cultivation waste has total gas production of17605.5ml, with TS gas production of142.7ml/g,with daily biogas production of489.6ml,with average methane content of53.8%; oyster mushroom cultivation waste has total gasproduction of14027.0ml, with TS gas production of116.9ml/g,with daily biogas productionof438.8ml, with average methane content of47.5%.(2)The research on the characteristics of anaerobic co-digestion of Lentinus edodes cultivation waste,plemtus eqngiu cultivation waste,oyster mushroom cultivation waste andthe Pig Manure on the Biogas production. Mix the Pig Manure and mushrooms cultivationwastes n anaerobic digestion, and adjust C:N to25/1. The test results show that: The benigncomplementary among materials can be set up by the high carbon materials with highnitrogen raw material, Meanwhile, Ammonia nitrogen inhibition in the single pig manureanaerobic digestion can be reduced. The biogas production peak of the material appear inadvance, and the total biogas production compared with single Lentinus edodes cultivationwaste,plemtus eqngiu cultivation waste and oyster mushroom cultivation waste mushroomsraise respectively. Anaerobic Co-digestion of Lentinus edodes cultivation waste has totalbiogas production of44284ml, with TS gas production of369.0ml/g,with daily biogasproduction of1220.9ml, with average methane content of50.3%; Plemtus eqngiu cultivationwaste has total gas production of33129.5ml, with TS gas production of276.1ml/g,with dailybiogas production of1057.7ml, with average methane content of51.0%; oyster mushroomcultivation waste has total gas production of30022.5ml, with TS gas production of250.2ml/g,with daily biogas production of956.7ml, with average methane content of48.3%.(3)The research on the characteristics of anaerobic fermentation of Lentinus edodescultivation waste on the Biogas production. The single factor anaerobic fermentation tests ofLentinus edodes cultivation waste are conducted that Liquid materials were selected theconcentration of6%,8%,10%,12%, the inoculum concentration10%,20%,30%,40%,pretreatment time3d,5d,7d,9d to confirm the conditions range of anaerobic fermentationof Lentinus edodes cultivation waste, L9(33) orthogonal test is on the basis of single factorexperiment. The test results show that: The primary and secondary relations of affect sizes ofthe factors on anaerobic digestion of Lentinus edodes cultivation waste are: pretreatmentdaysâ†'the inoculum concentrationâ†'liquid materials concentration. There is very significantinfluence on Pretreatment days to Lentinus edodes cultivation waste on the biogas production(p <0.01), the inoculum concentration significantly influence on biogas production(significant level p <0.05), the influence of concentration of material liquid on biogasproduction is not relatively significant. Preprocessing days should not be more than3d; Inthe range of20%-40%on the inoculum concentration, the bigger the inoculum concentrationstart more quick, select8%of material liquid concentration,the best conversion rate of rawmaterial can be achieved.(4)The research on the characteristics of mixed anaerobic fermentation of Lentinusedodes cultivation waste and the Pig Manure on the Biogas production. Quadratic regressionorthogonal rotating design is adopted, three factors of the inoculum concentration, C:N andmaterial liquid concentration are selected, two indexes of Accumulative total gas production and methane Content are investigated, establish mathematical model of characteristics ofmixed anaerobic fermentation of Lentinus edodes cultivation waste. Test results show that：The three factors of the influence on total biogas production total in Descending order: theinoculum concentration> material liquid concentration> C:N. The influence of the inoculumconcentration to average methane content is the most significant (P <0.01), the second ismaterial liquid concentration (0.25significant), The influence of C:N is minimum (F <1andP>0.5).