Research on the whole process treatment technology of PTA intermittent sewage

doi:10.19965/j.cnki.iwt.2024-1012

Abstract

Abstract:

The intermittent effluent from PTA processes is characterized by high concentrations of COD and salts. Mixing this with continuous PTA wastewater and domestic sewage can lead to an increase in the overall conductivity of the effluent from chemical fiber wastewater treatment plants. This study systematically investigated the independent treatment process for PTA intermittent wastewater. A spectrophotometric method for the analysis of PTA was established,showing good linear response at wavelengths of 240, 250, and 255 nm. The study systematically examined the acid precipitation pretreatment process, and under conditions of pH=4, the pretreatment achieved reduction rate over 95% for COD and over 99% for PTA, reducing the COD of the acid precipitation effluent to below 2 000 mg/L. Further comparison of the acid precipitation effluent treated by anaerobic biological, aerobic biological, and anaerobic-aerobic combined processes showed COD removal rates of 44.0%, 88.2%, and 91.5%, respectively, indicating that direct aerobic biological treatment of the acid precipitation effluent was a superior process choice. Finally, an activated carbon adsorption test was conducted on the aerobic effluent, and with an activated carbon dosage of 80 mg/L, the effluent COD was reduced to less than 60 mg/L, meeting the corresponding discharge standards.

Key words: purified terephthalic acid, intermittent sewage, whole process

摘要：

精对苯二甲酸（PTA）间断废水具有COD浓度高、盐含量高的特点，与PTA连续废水、生活污水混合处理会导致化纤污水处理厂排水整体电导率升高，系统性地研究了PTA间断废水独立处理全流程工艺，建立了PTA分光光度分析方法，在240、250、255 nm均有良好的线性响应。系统研究了酸沉预处理工艺，在pH=4的条件下经过预酸沉处理后COD和PTA削减率可分别达到95%和99%以上，酸沉出水COD降低至2 000 mg/L以下；进一步考察厌氧生化、好氧生化、厌氧+好氧对酸沉出水的处理效果发现，COD去除率分别为44.0%、88.2%、91.5%。结合处理工艺成本，酸沉出水直接进行好氧生化处理是更佳的工艺选择。最后对好氧出水进行活性炭吸附试验，活性炭投加量为80 mg/L时，出水COD<60 mg/L，满足相应的排放标准。

关键词: 精对苯二甲酸, 间断废水, 全流程

CLC Number:

X703.1

Yulin SUN, Cheng CHANG, Lushen ZUO, Feng GAO, Hui WANG, Rui ZHAO. Research on the whole process treatment technology of PTA intermittent sewage[J]. Industrial Water Treatment, 2025, 45(12): 155-161.

孙钰林, 常成, 左陆珅, 高峰, 王辉, 赵锐. 精对苯二甲酸间断废水全流程处理工艺研究[J]. 工业水处理, 2025, 45(12): 155-161.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-1012

https://www.iwt.cn/EN/Y2025/V45/I12/155

Figures/Tables 14

Fig.1 Simplified flowchart of the process at a petrochemical and chemical fiber wastewater treatment plant

Fig.2 Fitting of the absorbance of PTA at different wavelengths

Table 1 Effects of different pH on PTA determination

pH	吸光度	测定值/（mg·L^-1）	相对误差/%
2	0.851	11.37	42.10
3	0.833	11.12	38.98
5	0.622	8.31	3.83
7	0.600	8.01	0.16
9	0.602	8.04	0.47
11	0.600	8.01	0.16
13	0.601	8.02	0.30

Table 2 Water quality indicators of different batches of PTA intermittent effluent

批次	pH	电导率/（mS·cm^-1）	COD/（mg·L^-1）	PTA/（mg·L^-1）	THOD_TA	T/C系数
1#	13.43	27.80	58 871	32 543.2	46 862.21	0.80
2#	12.53	12.05	14 830	7 510.0	10 814.40	0.73
3#	12.57	12.06	20 522	7 696.4	11 082.82	0.54
4#	13.18	26.20	22 620	13 422.2	19 327.97	0.86
5#	12.52	12.06	14 081	7 536.6	10 852.70	0.77
6#	12.60	12.33	13 931	7 376.8	10 622.59	0.76
7#	12.75	17.92	24 444	14 913.5	35 199.36	0.88

Fig.3 PTA acid precipitation effects at different pH

Fig.4 Statistics of acid consumption during pH adjustment process

Fig.5 The influence of reaction time on PTA removal

Fig.6 PTA and COD removal by acid precipitation of the 1#-7# intermittent wastewater

Fig.7 Long-term operation effects of anaerobic biological devices

Fig.8 Anaerobic biodegradation pathway of terephthalic acid

Fig.9 Effects of reaction time on aerobic biochemical reaction

Fig.10 Aerobic biochemical reaction continuous operation status

Fig.11 Activated carbon adsorption COD removal experiment

Table 3 Comparison of different treatment process effects

处理工艺	厌氧生化	好氧生化	厌氧+好氧
进水COD/（mg·L^-1）	1 341.0	1 022.6	1 341.0
出水COD/（mg·L^-1）	751.0	121.0	114.0
COD去除率/%	44.0	88.2	91.5

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