处理DMF废水连续流和SBR两系统污泥毒性对比研究
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摘要
以处理难降解有机污染物N,N-二甲基甲酰胺(DMF)模拟废水的好氧活性污泥系统为研究对象,考察污泥毒性的形成规律及空间分布。污泥经120 mg/L的DMF冲击驯化后,继续提高DMF浓度至200 mg/L进行驯化。在相同DMF浓度下,对比连续流和间歇式(SBR)两系统的出水COD浓度、水泥相DMF含量及污泥毒性变化趋势和空间分布。结果表明,连续流和SBR两系统均能很好的降解DMF。但在稳定运行周期末,不管DMF浓度是120 mg/L还是200 mg/L,连续流系统污泥毒性均高于SBR系统,连续流系统污泥毒性平均为57%,55%;间歇式污泥毒性平均为47%,42%。故从污泥土地利用和污泥毒性消减的角度考虑,SBR系统是处理DMF废水的理想选择。
The formation process and spatial distribution property of sludge organic toxicity were investigated via aerobic activated sludge system treating synthetic wastewater containing toxic and refractory N, N-dimethylformamide(DMF). The activated sludge was impacted by 120 mg/L DMF, then increased DMF concentration to 200 mg/L, with the same DMF initial concentration, the effluent COD, DMF content both in aqueous and sludge phase, the variation tendency and spatial distribution of sludge toxicity were compared between continuous-flow and SBR reactors. Results showed that DMF was well removed in two kinds of reactors. However, during the stable operation period, regardless of DMF concentration as 120 mg/L or 200 mg/L, the sludge toxicity of continuous-flow was higher than SBR, and the average inhibiting luminosity were 57 %,55% for continuous-flow sludge and 47%, 40% for SBR sludge respectively. Therefore, considering the application of sludge land and reduction of sludge toxicity, SBR system is a better choice for treating DMF wastewater and for sludge toxicity reduction by source.
The formation process and spatial distribution property of sludge organic toxicity were investigated via aerobic activated sludge system treating synthetic wastewater containing toxic and refractory N, N-dimethylformamide(DMF). The activated sludge was impacted by 120 mg/L DMF, then increased DMF concentration to 200 mg/L, with the same DMF initial concentration, the effluent COD, DMF content both in aqueous and sludge phase, the variation tendency and spatial distribution of sludge toxicity were compared between continuous-flow and SBR reactors. Results showed that DMF was well removed in two kinds of reactors. However, during the stable operation period, regardless of DMF concentration as 120 mg/L or 200 mg/L, the sludge toxicity of continuous-flow was higher than SBR, and the average inhibiting luminosity were 57 %,55% for continuous-flow sludge and 47%, 40% for SBR sludge respectively. Therefore, considering the application of sludge land and reduction of sludge toxicity, SBR system is a better choice for treating DMF wastewater and for sludge toxicity reduction by source.
引文
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[3]Pilar Andres,Eduardo Mateos,David Tarrason,et al.Effects of digested,composted and thermally dried sewage sludge on soil microbiota and mesofauna[J].Applied Soil Ecology,2011,48(2):236-242.
[4]D Fytili,A Zabaniotou.Utilization of sewage sludge in EU application of old and new methods:a review[J].Renewable and Sustainable Energy Reviews,2008,12(1):116-140.
[5]林阳,张瑾,刘佳,等.沈阳市污水处理厂污泥处置现状及对策[J].环境保护科学,2009,35(2):60-62.Lin Yang,Zhang Jing,Liu Jia,et al.State and countermeasures of sludge treatment of wastewater treatment plant in Shenyang[J].Environmental Protection Science,2009,35(2):60-62.(in Chinese)
[6]申荣艳,骆永明,孙玉焕,等.长江三角洲地区城市污泥的综合生物毒性研究[J].生态与农村环境学报,2006,22(2):54-58.Shen Rongyan,Luo Yongming,Sun Yuhuan,et al.Comprehensive biological toxicity of municipal sludge from the Yangtze River Delta region[J].Journal of Ecology and Rural Environment,2006,22(2):54-58.(in Chinese)
[7]陈茂林,胡忻,王超.我国部分城市污泥中重金属元素形态的研究[J].农业环境科学学报,2004,23(6):1102-1105.Chen Maolin,Hu Xin,Wang Chao.Fraction and bioavailability of heavy metal elements in sewage sludge[J].Journal of Agro-environment Science,2004,23(6):1102-1105.(in Chinese)
[8]池勇志,迟季平,马颜,等.城镇污水污泥性质与处理处置概况[J].环境科学与技术,2010,33(12):169-172.Chi Yongzhi,Chi Jiping,Ma Yan,et al.Survey on sewage sludge characteristics and treatment and disposal[J].Environmental Science&Technology,2010,33(12):169-172.(in Chinese)
[9]申荣艳,骆永明,章钢娅,等.城市污泥农用对植物和土壤中有机污染物的影响[J].农业环境科学学报,2007,26(2):651-657.Shen Rongyan,Luo Yongming,Zhang Gangya,et al.Effect of municipal sludge on the accumulation of persistent organic pollutants in different plant-soil systems[J].Journal of Agricultural Environment Science,2007,26(2):651-657.(in Chinese)
[10]Oleszczuk P,Baran S.Kinetics of PAHs losses and relationships between PAHs properties and properties of soil in sewage sludge-amended soil[J].Polycyclic Aromatic Compounds,2005,25(3):245-269.
[11]蔡全英,莫测辉,朱夕珍,等.城市污泥对通菜-水稻土中有机污染物的累积效应[J].中国环境科学,2003,23(3):321-326.Cai Quanying,Mo Cehui,Zhu Xizhen,et al.Effect of municipal sludge on the accumulation of organic pollutants in Ipomoea aquatic plant-paddy soil[J].China Environmental Science,2003,23(3):321-326.(in Chinese)
[12]宋姗姗,张林生.N,N-二甲基甲酰胺(DMF)废水处理研究进展[J].江苏环境科技,2007,20(3):67-70.Song Shanshan,Zhang Linsheng.Advances in DMF-containing wastewater treatment[J].Jiangsu Environmental Science and Technology,2007,20(3):67-70.(in Chinese)
[13]Urakami T,Kobayashi H,Araki H.Isolation and identification of N,N-dimethylformamide biodegrading bacteria[J].Fermentation and Bioengineering,1990,70(1):45-47.
[14]Veeranagouda Y,Emmanuel P V,Gorlap P,et al.Complete mineralization of dimethylformamide by Ochrobactrum sp.DGVK1 isolated from the soil samples collected from the coalmine leftovers[J].Appl Microbiol Biotechnol,2006,71(3):369-375.