引用本文:操家顺,钱唐健,李超,等.CO2代替硫酸中和印染废水对厌氧处理的影响[J].环境科学研究,2019,32(8):1411-1418.
CAO Jiashun,QIAN Tangjian,LI Chao,et al.Effect on Anaerobic Treatment of Printing and Dyeing Wastewater with CO2 Neutralization Instead of Sulfuric Acid[J].Reserrch of Environmental Science,2019,32(8):1411-1418.]
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CO2代替硫酸中和印染废水对厌氧处理的影响
操家顺1,2, 钱唐健1,2, 李超1,2,3, 赵建军4, 胡健4, 孙琦4
1. 河海大学, 浅水湖泊综合治理与资源开发教育部重点实验室, 江苏 南京 210098;2. 河海大学环境学院, 江苏 南京 210098;3. 江苏省环境工程重点实验室, 江苏 南京 210098;4. 高邮市海潮污水处理厂, 江苏 扬州 225614
摘要:
高碱性印染废水在生化处理前需进行中和处理降低pH,而通常所采用的硫酸会对厌氧处理产生抑制效应,因此分别使用CO2和硫酸中和印染废水,并采用UASB反应器进行厌氧处理,对比分析反应器的处理效果与微生物群落结构.结果表明:采用CO2代替硫酸中和印染废水的UASB-2反应器内ρ(SO42-)显著降低,ρ(CODCr)/ρ(SO42-)由2~3升至6~8,CODCr去除率和氨化率分别升高了46.8%和42.2%;在进水采用硫酸中和的UASB-1反应器内,产酸菌与SRB(sulfate reducing bacteria,硫酸盐还原菌)丰度的增加导致反应器处理效率不佳,而UASB-2反应器内微生物多样性提高,绿弯菌门(Chloroflexi)、热孢菌门(Thermotogae)及Thermovirga属等优势菌群有利于提高厌氧污泥处理能力;进一步将CO2中和工艺代替硫酸中和工艺应用到实际工程,发现生化处理系统CODCr、TP、TN污染物去除率由原来的91%、82%和52%分别升至95%、89%和60%,每年可减少印染废水处理成本165×104元,减排CO2气体3 150 t.研究显示,CO2中和工艺在印染废水处理中有一定的推广应用价值.
关键词:  印染废水  CO2  中和  SO42-  UASB反应器
DOI:10.13198/j.issn.1001-6929.2019.01.18
分类号:X703.1
基金项目:国家水体污染控制与治理科技重大专项(No.2012ZX07101-003);中央高校基本科研业务费专项(No.2018B14814);江苏省环境工程重点实验室科研开放基金课题(No.KF2017001)
Effect on Anaerobic Treatment of Printing and Dyeing Wastewater with CO2 Neutralization Instead of Sulfuric Acid
CAO Jiashun1,2, QIAN Tangjian1,2, LI Chao1,2,3, ZHAO Jianjun4, HU Jian4, SUN Qi4
1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China;2. College of Environment, Hohai University, Nanjing 210098, China;3. Key Laboratory of Environmental Engineering in Jiangsu Province, Nanjing 210098, China;4. Gaoyou Haichao Sewage Treatment Plant in Jiangsu Province, Yangzhou 225614, China
Abstract:
The printing and dyeing wastewater with high pH need to be neutralized before the biochemical treatment. However, the commonly used sulfuric acid has inhibitory effects on the following anaerobic treatment. In this study, CO2 and sulfuric acid were applied to neutralize the printing and dyeing wastewater, respectively, and two UASB reactors were used for anaerobic treatment as a comparison. The performance and the microbial community of the UASB were analyzed. The results showed that CO2 neutralizing the printing and dyeing wastewater instead of sulfuric acid significantly reduced the concentration of sulfate in UASB-2 reactor. The value of ρ(CODCr)/ρ(SO42-) increased from 2-3 to 6-8, and the CODCr removal efficiency and ammoniation rate increased by 46.8% and 42.2%, respectively. In the UASB-1 reactor where the influent was neutralized with sulfuric acid, the increasing abundance of acid-producing bacteria and Sulfate Reducing Bacteria led to its poor reactor treatment efficiency.While the microbial diversity in the UASB-2 reactor is improved, and the dominant bacteria such as Chloroflexi, Thermotogae and Thermovirga are beneficial to improve the anaerobic sludge performance. Moreover, the CO2 neutralization process was used to replace the original sulfuric acid neutralization process. The removal efficiency of CODCr, TP and TN increased from 91%, 82% and 52% to 95%, 89% and 60%, respectively. The cost of printing and dyeing wastewater treatment was reduced by 1.65 million RMB,and CO2 emissions was reduced by 3150 t per year by using CO2 neutralization. Research shows that the CO2 neutralization process can be applied in the treatment of printing and dyeing wastewater.
Key words:  printing and dyeing wastewater  CO2  neutralize  SO42-  UASB reactor