鸟粪石沉淀—微电解-Fenton-EGSB组合工艺预处理有机磷系阻燃剂废水

发布时间：2018-12-19 07:53

【摘要】：以浙江省某化工厂的有机磷系阻燃剂生产废水为研究对象,针对其高有机磷、高COD、可生化性差、具有一定的生物毒性等特点,针对浙江省的提标要求,依托国家水体污染控制与治理科技重大专项(2012ZX07205-002),设计鸟粪石沉淀-Fe/C微电解-Fenton-EGSB组合工艺对其进行预处理。为一些高有机磷高浓度有机废水的处理提供工艺经验。采用鸟粪石沉淀去除废水中大部分PO_4~(3-)和NH_4~+-N,对反应的影响因素进行研究,确定其最佳反应条件为:pH=9.5,HRT=20 min,n(Mg):n(P)=1.1:1,最佳条件下PO_4~(3-)和NH_4~+-N的去除率分别可达98.45%、78.66%。选取6种高级氧化工艺:Fe/C微电解-Fenton氧化、单纯Fenton氧化、单纯O_3氧化、O_3/UV氧化、O_3/H_2O_2氧化、O_3/H_2O_2/UV氧化处理鸟粪石沉淀后的出水,通过开展一系列的试验研究,初步确定了各工艺的最佳反应条件,研究结果表明:(1)Fe/C微电解-Fenton氧化的最佳工艺参数为:pH=3.5,HRT=80min,30%H_2O_2的投加量为10%。(2)单纯的Fenton氧化的最佳工艺参数为:pH=3.5(实际应用中控制在2.5~4),HRT=100min,Fe2+的浓度为100mg/L时,30%H_2O_2的投加量控制在10%。(3)单纯的O_3氧化的最佳工艺参数为:pH=10,HRT=80min,臭氧的投加量为80mg/L,打开UV灯时的处理效果优于单纯的O_3氧化。(4)O_3/H_2O_2氧化的最佳工艺参数为:pH=9,HRT=6min,臭氧的投加量为80mg/L时,n(H_2O_2):n(O_3)控制在1:2,打开UV灯时的处理效果优于O_3/H_2O_2氧化。从污染物的去除率、水质生物毒性的降低、可生化性的提高比较了6种工艺,最终确定Fe/C微电解-Fenton氧化为处理鸟粪石沉淀出水的高级氧化单元,其对COD和TP的去除率达到了66.48%、91.11%,TP和COD可降至106.71 mg/L、7369.21mg/L。采用EGSB厌氧反应器对Fe/C微电解-Fenton氧化的出水进行处理,在33天左右完成了厌氧反应器的启动,当进水负荷控制在0.892~4.283kgCOD/(m3·d)范围内时,EGSB厌氧反应器具有较好的处理效果,其最佳运行参数为:水力停留时间为4d,pH控制在6.8~7.2之间,此时对COD的去除率为80%~85%,出水COD为1000mg/L左右。
[Abstract]:The wastewater from the production of organophosphorus flame retardants in a chemical plant in Zhejiang Province was studied. Aiming at the characteristics of high organophosphorus, low biodegradability of high COD, and certain biological toxicity, the standard requirements of Zhejiang Province were also discussed. Based on the National Water pollution Control and Control Technology (2012ZX07205-002), the combined process of bird dung stone precipitation, Fe/C microelectrolysis and Fenton-EGSB was designed to pretreat it. The process experience is provided for the treatment of some organic wastewater with high concentration of organophosphorus. Most of PO_4~ (3-) and NH_4~ N were removed from wastewater by gustonite precipitation. The influencing factors of the reaction were studied. The optimum reaction conditions were determined as follows: pH=9.5,HRT=20 min,n (Mg): n (P) = 1.1: 1, Under the optimum conditions, the removal rates of PO_4~ (3-) and NH_4~-N were 98.4545 and 78.66, respectively. Six advanced oxidation processes were selected: Fe/C microelectrolysis Fenton oxidation, O 3 oxidation, O_3/UV oxidation, O_3/H_2O_2 oxidation, O_3/H_2O_2/UV oxidized the effluent after guano stone precipitation. Through a series of experimental studies, the optimum reaction conditions of each process were preliminarily determined. The results show that: (1) the optimum process parameters of Fe/C microelectrolysis and Fenton oxidation are as follows: pH=3.5,HRT=80min, The dosage of 30%H_2O_2 is 10. (2) the optimum technological parameters for pure Fenton oxidation are: pH=3.5 (2.5? 4 in practical application), 100mg/L when the concentration of HRT=100min,Fe2 is 100mg/L. (3) the best process parameters for pure OK3 oxidation are: the dosage of pH=10,HRT=80min, ozone is 80 mg / L, When the UV lamp is turned on, the treatment effect is better than that of the simple O _ 3 oxidation. (4) the optimum process parameters of O_3/H_2O_2 oxidation are as follows: when the dosage of pH=9,HRT=6min, ozone is 80mg/L, N (H_2O_2): n (O _ 3) is controlled at 1: 2, and the treatment efficiency is better than that of O_3/H_2O_2 oxidation when UV lamp is turned on. In this paper, the removal rate of pollutants, the reduction of biological toxicity of water quality and the improvement of biodegradability were compared. Finally, Fe/C micro-electrolysis and Fenton oxidation was determined as the advanced oxidation unit to treat the effluent from gutulite precipitation. The removal rate of COD and TP reached 66.48% and 91.11%. TP and COD could be reduced to 106.71 mg/L,7369.21mg/L.. The EGSB anaerobic reactor was used to treat the effluent from Fe/C microelectrolysis-Fenton oxidation. The start-up of the anaerobic reactor was completed in about 33 days. When the influent load was controlled within the range of 0.892~4.283kgCOD/ (m3 d), The optimal operating parameters of EGSB anaerobic reactor are as follows: the HRT is 4 d ~ (-1) pH is controlled in the range of 6.8 ~ 7.2, the removal rate of COD is 80 ~ 85%, and the effluent COD is about 1000mg/L.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X78

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