Preliminary Study On The Application Of Industrial Solid Waste (phosphorus Residue, Distiller's Grains)

With the rapid development of industry,a large number of industrial solid wastes are produced.If it is not properly used,it will inevitably cause serious environmental pollution,waste of resources,and even affect people's quality of life.In this paper,phosphorus tailings and Maotai-flavor liquor distiller's grains were taken as the research object,and the comprehensive utilization of the two main industrial solid wastes in Guizhou was studied.We firstly separated and screened the phosphate-solubilizing microorganisms from the soil around the phosphate tailings,and measured their phosphate-solubilizing ability.The microorganisms with higher phosphate-solubilizing ability were selected and added to the mixed organic matter of phosphorus tailings and Maotai-flavor liquor distiller's grains.When the content of available phosphorus in solid state fermentation reached the highest,supplementary materials such as straw,limestone and zeolite were added for secondary aerobic compost fermentation.Through the twice fermentation of phosphor tailings and Maotai-flavored distillers grains,phosphorus-containing organic fertilizers that meet the relevant standards for organic fertilizers were finally obtained.The study not only effectively used and eliminated the two major industrial solid wastes in Guizhou,which are phosphorus tailings and Maotai-flavored distiller's grains,but also provided new technical and data foundations for the elimination and sustainable development of Guizhou's industrial solid waste.It has the Practical Significance of Ecological Environment in Guizhou Province.The main conclusions are as follows:1.Four strains of bacteria with phosphate-solubilizing ability and seven strains of fungi with phosphate-solubilizing ability were isolated and purified from samples collected from the four sites at the Wengfu phosphorus tailings dumping site in Guizhou Province.They were identified as Serratia plymuthica,Stenotrophomonas rhizophila,Stenotrophomonas maltophilia,Brevundimonas vesicularis,Mucor circinelloides,Fusarium oxysporum,Fusarium proliferatum,Trichoderma virens,Fusarium oxysporum,Trichoderma asperellum and Paecilomyces lilacinus.2.Phosphate-solubilizing ability of the phosphate-solubilizing strains weredetermined by solid and liquid culture methods,respectively.The results showed that there were significant differences in the phosphate-solubilizing ability of different strains.Phosphate-solubilizing bacteria obtained by the experiment had stronger phosphate-solubilizing ability than the phosphate-solubilizing fungi.Among four strains of phosphate-solubilizing bacteria and seven strains of phosphate-solubilizing fungi,the strain PSB3 and PSF7 had the strongest phosphate-solubilizing ability,which were 147.73 ?g/m L and 98.09 ?g/m L,respectively.They were rarely reported in terms of inorganic phosphorus and worth researching.3.Optimal process conditions for the solid state fermentation of phosphorus tailings and Maotai-flavor liquor distiller's grains was obtained by single factor experiments and response surface optimization design.The content of phosphorus tailings was 6.89%,the inoculation amount was 18.04%,and the ratio of strain(PSF7:PSB3)was 2.3:1.Under this condition,the available phosphorus content in solid-state fermentation was 3108.05 mg/kg.The error is only 0.54% compared to the theoretical value of 3128.86 mg/kg.4.When solid state fermentation was conducted on the third day,the available phosphorus content in the experimental group was 1.78 times that of the control group.It showed that adding phosphate-solubilizing strain during solid state fermentation can effectively increase the available phosphorus content.After the third days of solid-state fermentation,the available phosphorus content began to decline,and secondary compost fermentation should be carried.5.The temperature of the experimental group reached 51.0? on the fifth day,and maintained at the high temperature stage(>50?)for five days,while the control group only maintained two days.The final p H value of the experimental group was7.84,which met the requirement of p H index when organic fertilizer is decomposed.6.During the entire secondary composting process,the total carbon and C/N of the experimental group were significantly lower than that in the control group,and the total nitrogen in the experimental group was higher than that in the control group after the composting was completed.It shows that the degradation of organic matter in the experimental group was obvious and the nitrogen was maintained.7.After composting,the germination index GI of the experimental group reached84.92%,and the compost was basically decomposed.The control group had the germination index GI of 73.83%,indicating that fertilizers in the experimental group reached maturity sooner and the composting time was significantly shortened.The main physical and chemical indicators of the compost products obtained by the experiment are basically in accordance with the relevant standards of organic fertilizers,and can promote the growth of plants.