Abstract:

The comprehensive wastewater from a pharmaceutical chemical plant in Shandong Province consists of concentrated wastewater，clean wastewater and domestic wastewater. The concentrated wastewater has the characteristics of high COD and high NH₃-N，and therefore requires pretreatment after quality separation to meet the water quality standards for the receiving body of the wastewater treatment plant. Firstly，the concentrated wastewater was pretreated with micro-electrolysis. The pretreated concentrated wastewater was mixed with the clean and domestic wastewaters after removing the suspended solids before undergoing subsequent treatment through an UASB-improved two stage A/O-sequence batch precipitation combination process. Engineering practice showed that this process had a good treatment effect on the comprehensive wastewater，resulting in stable operation and a high capacity to handle impact loads. After treatment，the COD，NH₃-N and TN of the effluent were reduced to below 200，3 and 20 mg/L，respectively，meeting the secondary standards in Table 4 of the Comprehensive Sewage Discharge Standard （GB 8978-1996） and meeting the water quality requirements of the receiving water body of the sewage treatment plant.

Key words: pharmaceutical wastewater, UASB, improved two-stage A/O, sequence batch precipitation

摘要：

山东某医药化工厂综合废水包含浓污水、清污水和生活污水，且浓污水具有高COD和高NH₃-N的特点，需对其进行分质预处理后再将其处理至达到污水处理厂接收水体的水质标准。首先采用微电解对浓污水进行预处理，之后将预处理后的浓污水与清污水及除悬浮物后的生活污水混合后采用UASB-改良型两级A/O-序批沉淀组合工艺进行后续处理。工程实践表明，所采用的工艺对综合废水具有良好的处理效果，且运行稳定，耐冲击负荷高。处理后出水COD、NH₃-N、TN分别降至200、3、20 mg/L以下，满足《污水综合排放标准》（GB 8978—1996）表4中的二级标准，达到污水处理厂接收水体的水质要求。

关键词: 医药废水, UASB, 改良型两级A/O, 序批沉淀

CLC Number: 

• X787