Research On The Properties And Resources Utilization Of Liquor Sludge

The liquor industry is a traditional industry. In2012, production of Chinese liquor had reached11.53billion liters. Sichuan liquor output value will exceed300billion Yuan at the end of the twelfth five-year plan. It is estimated that approximately60tons of water was consumed and48tons of waste water was produced for every1ton of65degrees liquor. At present, a lot of large liquor companies have set up their own sewage treatment stations. Sludge is a by-product in wastewater treatment process, about3%of wastewater. Improper sludge disposal not only secondarily pollute to the environment, but also waste useful component in the sludge. Exploring disposal ways of sludge reduction, stabilization, harmless and resource utilization has become the major issues facing the liquor business.Wuliangye is a famous liquor production company, about16,500tons sludge produced in its wastewater treatment process (water content70%). Resources utilization of Wuliangye brewery wastewater sludge as an example is representative. Some indexes of Wuliangye wastewater sludge was measured in this study. Through comparing advantages and disadvantages of several sludge resources utilization ways, the way of Wuliangye brewery wastewater sludge resource utilization was screened out. Production process of the use pattern screened out was compared and selected, and the feasibility of producing organic complex fertilizers was studied. The major results and conclusions could be enumerated as follows:(1) The mean pH of the Wuliangye brewery sludge was6.44, substantially neutral. Water content was69.17%. The average content of organic matter, total nitrogen and phosphorus was793.39g kg-1,44.79g kg-1,38.44g kg-1, much higher than the average level of municipal sludge. The average content of potassium was3.42g kg-1, lower than the average level of municipal sludge. Heavy metal content of Wuliangye wastewater sludge was low. Chromium was98.83mg kg-1, lead16.59mg kg-1, cadmium1.94mg kg-1, arsenic1.90mg kg-1, mercury0.47mg kg-1. Calorific value of Wuliangye wastewater sludge was18921KJ kg-1,60.27%higher than the average of municipal sludge, and was equivalent to the average calorific value of the sawdust. (2) The monthly variation of Wuliangye wastewater sludge characteristics was not obvious.(3) In addition to the total nitrogen content of the wastewater station significantly lower than the other two stations and the total phosphorus content significantly higher than the other two stations, there was no significant difference among three wastewater stations of Wuliangye on other sludge characteristics.(4) The advantages and disadvantages of several resources utilization were studied. Accordance to the characteristics of Wuliangye wastewater sludge and principles of the sludge disposal, the production of organic complex fertilizers using Wuliangye wastewater sludge was screened out.(5) The process of producing organic complex fertilizers using Wuliangye wastewater sludge was as follows:facultative anaerobic composting,30%organic matter content, N(urea):P2O5(calcium superphosphate):K2O(potassium chloride)=11:3:7, extrusion granulation.Before composting, moisture content of sludge was adjusted to50%-60%, then moisture content should be reduced to below20%.After granulated, organic complex fertilizers products must be dried to a moisture content of10%or less.(6) After investment estimate and the overall effectiveness of evaluation, the scheme of producing organic complex fertilizers using Wuliangye wastewater sludge was feasible.