玉米深加工企业清洁生产技术的应用对废水处理效果的影响

对玉米深加工企业EGSB+A/O废水处理工艺进行问题诊断，提出清洁生产的改造措施，研究其对废水处理效果的影响。结果表明，在主生产车间加装澄清离心机和废水预处理段增设竖流沉降罐，提高了EGSB反应器运行效率，反应器进出水COD_Cr平均值分别下降59%和62%以上，比产气率提高45%。改造后二沉池出水COD_Cr、BOD₅、NH₄⁺-N、SS平均浓度从124、31、57和33 mg/L降至55、9、5和19 mg/L，出水pH为6.3~6.9，达到GB 25461—2010《淀粉工业水污染物排放标准》要求。改造工程同时可创造132.04万元/a的经济效益。

Effects of Cleaner Production Technologies of a Corn Starch Enterprise on Wastewater Treatment Effectiveness

The problem diagnosis was performed for EGSB+A/O wastewater treatment process of a corn starch enterprise, and the cleaner production renovation measure were proposed for the enterprise. The effects of the cleaner production renovation measure on wastewater treatment effectiveness were investigated. The results showed that the operational efficiency of EGSB reactor could be enhanced by adding a centrifuge in the main workshop and vertical flow sedimentation tank in wastewater pretreatment section. The average CODCr concentrations of the inlet and outlet were reduced by 59% and 62% respectively, and the specific methane production rate was increased by 45%. After renovation engineering, the average CODCr, BOD5, NH4+-N, SS concentrations of the effluent wastewater from the secondary sedimentation tank were reduced from 124, 31, 57 and 33 mg/L to 55, 9, 4.5 and 19 mg/L, respectively, and the pH value was 6.3-6.9, all meeting with Discharge Standard of Water Pollutants for Starch Industry (GB 25461-2010). The clean production renovation engineering could also create an annual economic benefit of 1.320 4 million Yuan.