重金属捕集剂强化混凝处理制革废水的研究
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摘要
以某皮革企业排放的综合废水为研究对象,选取重金属捕集剂作为除铬沉淀剂,探讨捕集剂种类、添加量、体系pH、温度、絮凝剂与助凝剂添加量、沉降时间对除铬效果的影响。结果表明,LX-Y803的除铬效果最好,最佳投药量为90 mg/L,最佳pH为9,温度为50℃。添加絮凝剂和助凝剂强化沉降,结果表明,PAM最佳投加量为2.5 mg/L,助凝剂最佳投加量为0.2 mg/L,最佳沉降时间为15 min。最终,总铬去除率可达98.27%,有机铬去除率为97.08%,无机铬去除率为99.62%,处理后废水中的总铬为0.97 mg/L,达到GB 30486—2013《制革及毛皮加工工业水污染物排放标准》要求。
The comprehensive wastewater discharged from a leather enterprise has been used as a research target,and the heavy metal trapping agent as chromium removing precipitant. The influences of trapping agent species,dosage,system p H,temperature,dosages of flocculants and coagulant aids,and setting time on the chromium removal effect have been discussed. The results show that the chromium removal effect of LX-Y803 is the best. Its optimal dosage is 90 mg/L,and the optimal pH 9 and the optimal temperature 50 ℃. The addition of flocculants and coagulant aids can enhance the setting effect. The results also show that the optimal dosage of PAM is 2.5 mg/L,dosage of coagulant aids 0.2 mg/L,and optimal setting time 15 min. Under these conditions,the total chromium removing rate reaches 98.27%,organic chromium removing rate reaches 97.08%,and inorganic chromium removing rate reaches 99.62%.The total chromium content in the treated wastewater is 0.97 mg/L,meeting the requirements specified in the Discharge Standard of Water Pollutants for Leather and Fur Making Industry(GB 30486—2013).
The comprehensive wastewater discharged from a leather enterprise has been used as a research target,and the heavy metal trapping agent as chromium removing precipitant. The influences of trapping agent species,dosage,system p H,temperature,dosages of flocculants and coagulant aids,and setting time on the chromium removal effect have been discussed. The results show that the chromium removal effect of LX-Y803 is the best. Its optimal dosage is 90 mg/L,and the optimal pH 9 and the optimal temperature 50 ℃. The addition of flocculants and coagulant aids can enhance the setting effect. The results also show that the optimal dosage of PAM is 2.5 mg/L,dosage of coagulant aids 0.2 mg/L,and optimal setting time 15 min. Under these conditions,the total chromium removing rate reaches 98.27%,organic chromium removing rate reaches 97.08%,and inorganic chromium removing rate reaches 99.62%.The total chromium content in the treated wastewater is 0.97 mg/L,meeting the requirements specified in the Discharge Standard of Water Pollutants for Leather and Fur Making Industry(GB 30486—2013).
引文
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[12]Wang Fenghe,Ji Yingxue,Wang Junjie.Synthesis of heavy metal chelating agent with four chelating groups of N1,N2,N4,N5-tetrakis(2-mercaptoethyl)benzene-1,2,4,5-tetracarboxamide(TMBTCA)and its application for Cu-containing wastewater[J].Journal of Hazardous Materials,2012,241-242:427-432.
[2]强涛涛,张晓峰,王学川.制革废液循环利用技术的研究进展[J].大连工业大学学报,2010,29(26):441-444.
[3]Mustafa S,Shah K H,Naeem A,et al.Chromium(Ⅲ)removal by weak acid exchanger Amberlite IRC-50(Na)[J].Journal of Hazardous Materials,2008,160(1):1-5.
[4]Golder A K,Samanta A N,Ray S.Removal of trivalent chromium by electrocoagulation[J].Journal of Separation and Purification Technology,2007,53(1):33-41.
[5]Chen Suhong,Yue Qinyan,Gao Baoyu,et al.Adsorption of hexavalent chromium from aqueous solution by modified corn stalk:A fixedbed column study[J].Bioresource Technology,2012,113:114-120.
[6]霍小平,刘存海.铬鞣废水处理现状综述[J].西部皮革,2009,31(23):37-42.
[7]Religa P,Kowalik A,Gierycz P.Application of nanofiltration for chromium concentration in the tannery wastewater[J].Journal of Hazardous Materials,2011,186(1):288-292.
[8]Kantar C,Ari C,Keskin S.Comparison of different chelating agents to enhance reductive Cr(Ⅵ)removal by pyrite treatment procedure[J].Water Research,2015,76:66-75.
[9]Ayoub G M,Hamzeh A,Semerjian L.Post treatment of tannery wastewater using lime/bittern coagulation and activated carbon adsorption[J].Desalination,2011,273(2/3):359-365.
[10]Wang Dandan,Ye Yuxuan,Liu Hui,et al.Effect of alkaline precipitation on Cr species of Cr(Ⅲ)-bearing complexes typically used in the tannery industry[J].Chemosphere,2018,193:42-49.
[11]陈双,黄涵,颜桂炀.碱-混凝剂法对制革废水中Cr3+和COD去除效果研究[J].宁德师范学院学报:自然科学版,2016,28(3):274-276.
[12]Wang Fenghe,Ji Yingxue,Wang Junjie.Synthesis of heavy metal chelating agent with four chelating groups of N1,N2,N4,N5-tetrakis(2-mercaptoethyl)benzene-1,2,4,5-tetracarboxamide(TMBTCA)and its application for Cu-containing wastewater[J].Journal of Hazardous Materials,2012,241-242:427-432.