奶牛和猪液体粪污贮存过程中理化特性的研究OA

To investigate the physicochemical characteristics of liquid manure during storage,dairy cow and pig liquid manure were selected as the research subjects.Two batches of experiments were conducted in summer,autumn-winter-spring to measure the nutrient indicators(total nitrogen,total phosphorus,total potassium),physicochemical indicators(pH,chemical oxygen demand,water insolubles,total salt concen-tration),heavy metal indicators(total As,total Hg,total Pb,total Cd,total Cr),and hygienic indicators(mortality rate of ascarid eggs,fecal coliform count)during storage under different treatment methods(storage fermentation,anaerobic fermentation).The results showed:①During storage in summer,the total phosphorus and total potassium content of dairy cow and pig liquid manure decreased while pH increased.During storage in autumn-winter-spring,the chemical oxygen demand increased.②The pH and water in-solubles content of pig anaerobic digested slurry met the requirements during storage,while the total salt concentration was high and did not meet the requirement.③The heavy metal indicators(total As,total Hg,total Pb,total Cd,total Cr)content and ascarid egg mortality rate of dairy cow and pig liquid manure under different treatment methods met the requirements,and the number of fecal coliforms showed a de-creasing trend during storage.Altogether,the dairy cow and pig liquid manure treated by storage fermenta-tion was stored for 2 months in summer and 6 months in autumn-winter-spring.The anaerobic digested slurry was stored for 2 months,which basically met the requirements for harmlessness,but the chemical oxygen demand and total salt concentration were still high.Therefore,appropriate treatment should be car-ried out before resource utilization.