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Study On Straw And Cattle Waste Mixed Composting And Its Applications

Posted on:2013-05-23Degree:MasterType:Thesis
Country:ChinaCandidate:R P LiFull Text:PDF
GTID:2251330398992298Subject:Environmental Engineering
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Producting compost and cultivating mushroom with straw and livestock wastes not only make full use of agricultural waste, reduce environmental pollution, but also obtain better economic benefits. Agaricus bisporus residues which had much organic matter and nutrient were highly efficient organic fertilizer. The thesis aimed at providing the theoretical basis for co-composting with straw and livestock wastes and its applications.The paper firstly discussed discussed the maturity and parameters of straw composting with cattle manure and cattle slurry. then conducted composting to process straw and livestock wastes and the pilot-scale composting of fermented culture medium.(1) The experiment discussed the maturity and parameters of straw composting with cattle manure and cattle slurry. The results indicated that the temperature change of different treatments was basically the same and experienced increasing rapidly temperature stage, high temperature stage and decreasing temperature stage. The high temperature duration above50℃of different treatments was10,7and9days, respectively, which all conformed to the sanitary standard (GB7975-87) of the aerobic composting. The E4/E6value of different treatments increased firstly and then decreased to the final steady state during composting. The total organic carbon and the C/N value of different treatments were gradually decreased to the final steady state during composting. At the end of composting, the T value (the ratio of final C/N and initial C/N) of different treatments were all less than0.6. The organic carbon degradation of composting materials was positively related to the loss of heat. If the heat generated was all used to remove the moisture of the substance, the medium could be dried up. The total phenolic acid of different treatments increased firstly and then decreased to the final steady state during compost. The biomass of rice plant cultivated with different stage composting decreased firstly and then gradually increased to maximum value. All of this showed that the different treatments composting reached maturity after60days of compost.(2) For processing straw and livestock wastes, the experiment researched wheat straw was co-composted with biogas residues, biogas slurry, cattle manure and cattle slurry, respectively, and the pure wheat straw composting was regarded as CK, which C/N ratio was regulated to35:1with urea. The results indicated that the high temperature duration above50℃of different treatments was30,17,41,12and24days, respectively, which all conformed to the sanitary standard (GB7975-87) of the aerobic composting. For the different treatments the activity of cellulose and dehydrogenase increased firstly and decreased then during composting, but the the activity of cellulose and dehydrogenase was different in different treatments; the organic carbon content in different treatments decreased by14%,5.5%,15.8%,4.45%and10.7%at the end of experiment, respectively. The nitrogen, phosphorus and potassium content of different treatments increased during composting. The total nutrient (N+P2O5+K2O) content of diffetent treatments composting was69.61g/kg、49.10g/kg、89.45g/kg、46.54g/kg and63.33g/kg, respectively. The composting products of different treatment met notional organic fertilizer standards and was highly efficient fertilizer.The total nutrient (N+P2O5+K2O) content of T3(straw and cattle manure) was highest and wheat straw co-composted with biogas slurry and cattle slurry was a good way of processing straw and livestock wastewater. So wheat straw co-composted with livestock wastes could effectively process straw and livestock wastes, and product better commercial organic fertilizer.(3) The experiment researched the pilot-scale composting of fermented culture medium and applicable effect of Agaricus bisporus cultivating with straw and cattle manure. At the end of secondary aerobic digestion, the pH of fermented culture medium in different tunnels was suitable for edible fungus growth; the organic carbon, C/N and soluble sugar of fermented culture medium in different tunnels was from301.27g/kg to371.98g/kg, from17.13to28.68and from2.38%to3.02%, respectively. The Agaricus bisporus cultivated in tunnel A5was better than other ones, its fruit body quality was the best, which had the highest protein content, the lowest fat content, the middle content of polysaccharide, crude fiber and ash, and tunnel A5had a good products. The formula of fermented culture medium in tunnel A5was rational for Agaricus bisporus cultivating. Total carbon content, total nitrogen and C/N of initial fermented culture medium in tunnel A5was336.36g/kg、10.19g/kg and33.02. Total carbon content and C/N of fermented culture medium were negatively related to the quality and products of Agaricus bisporus, total nitrogen of fermented culture medium was positively related to the quality and products of Agaricus bisporus. Therefore, it is important to control the degradation of organic carbon and the loss of total nitrogen and maintain suitable C/N in fermented culture medium.
Keywords/Search Tags:Straw, Livestock Wastes, Mixed Composting, Fermented CultureMedium for Agaricus Bisporus
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