摘要
针对已运行尾菜规模化处理系统总体效益差的问题,结合运行数据对系统稳定性、处理效果和运行成本进行详细分析,总结运行期出现的问题,提出对应措施.分析结果表明:预处理系统平均日处理量为454.13 t,在运行第48～121天因进料量增大无法保证稳定的脱水效果;厌氧发酵系统平均产气量为748.8 m3,运行期间平均酸碱度(pH)和温度分别为6.27和24 ℃,罐内物料酸化是发酵系统失稳的主要原因;污水处理系统平均进水量为551.7 m3,出水化学需氧量(COD)质量浓度为288.38 mg/L,出水氨氮(NH3-N)质量浓度为4.60 mg/L,出水总氮(TN)质量浓度为31.55 mg/L,出水总磷(TP)质量浓度为3.61 mg/L,均达到排放标准.在实际处理效果方面,预处理系统平均脱水率39.35％,最大脱水率可达80.16％;污水处理系统平均COD去除率为98.71％,NH3-N去除率为99.71％,TP去除率为98.63％,TN去除率为98.07％.在运行成本分析中,运行费用为94.44元/t,其中运输费用最高,占运行成本的31.76％;水费、人工费和药剂费支出较高,分别占运行成本的23.78％、14.14％和16.86％;燃料费用最低,占运行成本的0.03％.原料输入不稳定、杂质去除不彻底、压榨效果不明显、发酵系统易酸化、污水处理成本高是造成系统运行效果差的重要原因.
Abstract
In order to address the issue of the low overall benefit of the large-scale processing system of running tail vegetables,the system stability,processing effect,and operation cost were thoroughly exam-ined by combining the operation data,the problems encountered during the operation period were summa-rized,and the appropriate measures were proposed.The analysis results are as follows,pretreatment sys-tem's average daily processing capacity was 454.13 t,and the stable dehydration effect could not be guaran-teed on the 48～121 days of operation due to the increase in feed volume.The anaerobic fermentation sys-tem produces 748.8 m3 of gas on average,and the average potential of hydrogen(pH)and temperature during operation are 6.27 and 24 ℃,respectively.The main cause of fermentation system instability is acidification of materials in the tank.The sewage treatment system's average water input is 551.7 m3,its effluent chemical oxygen demand(COD)concentration is 288.38 mg/L,its effluent ammoniacal mitrogen(NH3-N)concentration is 4.60 mg/L.The total nitrogen(TN)content in effluent was 31.55 mg/L,and the total phosphorus(TP)concentration was 3.61 mg/L,both of which met the emission requirement.In terms of actual treatment effect,the average dehydration rate of the pretreatment system was 39.35％,and the maximum dehydration rate reached 80.16％.The average removal rates for COD,NH3-N,TP,and TN are 98.71％,99.71％,98.63％and 98.07％,respectively.According to the operating cost analysis,the operating cost is 94.44 yuan/t,with transportation accounting for 31.76％of the operating cost.Water,labor,and pharmaceutical expenses accounted for 23.78％,14.14％,and 16.86％of running costs,respec-tively,with fuel costs accounting for the least,accounting for 0.03％of operational costs.The unstable raw material input,incomplete magazine removal,inobvious pressing effect,easy acidification of the fer-mentation system,and high cost of sewage treatment are the major reasons for the system's poor operation outcomes.
维普
万方数据