摘要:
以某薄膜晶体管液晶显示器(TFT-LCD)企业的废水处理厂为例,对其接纳的废水进行分析。针对废水成分复杂、水质变化大、污染物浓度高、可生化性差以及排放要求高的特点,将废水分为有机废水、酸碱废水和含氟废水进行分类收集、分质预处理,经预处理后的3种废水混合后再进行进一步处理。根据混合废水的水质特性,设计开发了水解酸化+两级AO/MBR+臭氧催化氧化+BAF(DN型)+气浮+次氯酸钠消毒的组合处理工艺。运行结果表明,该组合工艺运行稳定,试运行期间平均出水COD、BOD5、NH3-N、TP、TN、SS、F-、总铜分别为15、2.1、0.16、0.13、3.8、2、0.81、0.19 mg/L,出水水质能够稳定达到设计要求,直接运行成本约5.17元/m3。
关键词:
TFT-LCD废水,
水解酸化,
两级AO/MBR,
臭氧催化氧化,
曝气生物滤池,
气浮
Abstract:
This paper analyzed the wastewater treatment of a thin film transistor-liquid crystal display(TFT-LCD) manufacturer. In response to the complex composition, changes in water quality, high concentration of pollutants, poor biodegradability, and high discharge requirement, the wastewater was classified into organic wastewater, acid/base wastewater, and fluorine-containing wastewater for collection and pre-treatment. After pretreatment, the three types of wastewater were mixed for further treatment. Based on the characteristics of the wastewater mixed after pretreatment, a combined process of hydrolysis acidification+two-stage AO/MBR+ozone catalytic oxidation+BAF(DN type)+air flotation+sodium hypochlorite disinfection was designed and developed. The results showed that the process was stable, the average effluent COD, BOD5,NH3-N, TP, TN, SS, F-, and total Cu during trial operation were 15, 2.1, 0.16, 0.13, 3.8, 2, 0.81, and 0.19 mg/L respectively. The effluent quality could meet the design requirements stably, with direct treatment cost of about 5.17 yuan/m3.
Key words:
TFT-LCD wastewater,
hydrolytic acidification,
two-stage AO/MBR,
ozone catalytic oxidation,
biological aerated filt,
air flotation
中图分类号:
关永年. 水解酸化+两级AO/MBR+臭氧催化氧化+BAF+气浮处理TFT-LCD废水[J]. 工业水处理, 2024, 44(10): 207-214.
Yongnian GUAN. Treatment of TFT-LCD wastewater by hydrolysis acidification+ two-stage AO/MBR+ozone catalytic oxidation+BAF+air flotation process[J]. Industrial Water Treatment, 2024, 44(10): 207-214.