Study on Influence of Sludge Recycle Ratio on Removal of Nitrogen and Phosphorous in Two-Sludge BCR Denitrifying Phosphorus Removal Process
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摘要: 以模拟华南地区的城镇污水研究对象，开展了污泥回流比对双污泥BCR反硝化除磷的影响研究. 结果表明：使超越污泥和回流污泥的回流比分别控制为0.6、0.4和0.2时， BCR工艺对COD去除率的均值分别为89.98%、89.48%和82.38%，出水COD平均质量浓度分别为20.94 、21.67 、37.66 mg/L；而总氮的去除率均值则分别为79.94%、80.58%和65.47%，出水总氮平均质量浓度分别为5.72 、5.75 、10.85mg/L；总磷去除率的均值分别为88.81%、91.64%和77.06%，出水总磷质量浓度均值为0.76 、0.59 、1.62mg/L，新工艺改善了传统双污泥连续流工艺出水NH4+-N质量浓度偏高的缺陷. 工艺在超越污泥回流比和回流污泥回流比均是0.4时处理效果最佳. 由于好氧硝化池与中沉池合建，好氧硝化池中的NO3--N与中沉池中的DPB接触而发生反硝化吸磷的反应而使部分总磷在好氧硝化池中被去除.
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关键词:
- 污泥回流比
Abstract: The influence of different sludge ratios from middle sedimentation tank to anoxic reactor( exceeding sludge ratio) and from final sedimentation tank to anaerobic reactor ( recycled sludge ratio) on denitrifying phosphorus removal in two-sludge BCR denitrifying phosphorus removal process was investigated using simulated domestic wastewater. Results showed that when the ratios of two kinds of sludge are 0.6, 0.4 and 0.2 respectively, the resulting average COD removal rates are 89.98%, 89.48% and 82.38% , total nitrogen removal rates are 79.94%, 80.58% and 65.47%, and phosphorus removal rates are 88.81%, 91.64% and 77.06%, respectively. The effluent COD concentrations are 20.94 mg/L, 21.67 mg/L and 37.66 mg/L, total nitrogen concentrations are 5.72 mg/L, 5.75 mg/L and 10.85mg/L, and phosphorus concentrations are 0.76 mg/L, 0.59 mg/L and 1.62mg/L, respectively. Compared to two-sludge A2N process, the problem of high ammonia nitrogen has been improved. When the ratios of two kinds of sludge are 0.4, two-sludge BCR denitrifying phosphorus removal process has best pollutant removal efficiency. Since the aeration tank and sedimentation tank are integrated, denitrifying dephosphatation with nitrate as electron acceptor was occur under anoxic condition due to contribution of denitrifying phosphorus removal bacteria.-
Keywords:
- sludge recycle ratio
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[1]华光辉,张波. 城市污水生物除磷脱氮工艺中的矛盾关系及对策[J]. 给水排水, 2002,26(12) : 1-4.
[2]张洁,胡卫新,张雁秋. 改进型双泥反硝化除磷脱氮工艺——一种可望从根本上解决脱氮除磷矛盾的新工艺[J]. 环境污染与防治, 2005, 27(3):232-235.
[3] Zuthi M F R, Guo W S, Ngo H H, et al. Enhanced biological phosphorus removal and its modeling for the activated sludge and membrane bioreactor processes[J]. Bioresource Technology, 2013, 139(13):363-374.
[4] Marcelino M ,, Wallaert D ,, Guisasola A ,, et al. A two-sludge system for simultaneous biological C, N and P removal via the nitrite pathway.[J]. Water Science & Technology A Journal of the International Association on Water Pollution Research, 2011, 64(5):1142-7.
[5] Kapagiannidis A G, Zafiriadis I, Aivasidis A. Effect of basic operating parameters on biological phosphorus removal in a continuous-flow anaerobic-anoxic activated sludge system.[J]. Bioprocess & Biosystems Engineering, 2012, 35(35):371-82.
[6]刘莹,彭永臻,王淑莹. A_2N工艺的固有弊端分析及其对策研究[J]. 工业用水与废水,2010,41(6):1-5.
[7]王亚宜,王淑莹,彭永臻. MLSS、pH及NO_2~--N对反硝化除磷的影响[J]. 中国给水排水, 2005, 21(7):47-51.
[8]朱文韬,吕锡武,史静. 电子受体和MLSS对反硝化除磷的影响[J]. 净水技术, 2014,33(5):31-37.
[9]吕娟. NO_2~--N、MLSS对反硝化脱氮除磷的影响[J]. 水资源与水工程学报, 2014,25(5):207-210.
[10]李相昆,姜安玺,于健,等.连续流双污泥反硝化同时除磷系统影响因素[J].沈阳建筑大学学报,2005,21(5):560-563.
[11]杨庆娟,王淑莹,刘莹,袁志国. 污泥回流比对A_2N反硝化除磷工艺脱氮除磷的影响[J]. 中国给水排水, 2008, 24(13):37-41.
[12] Kapagiannidis A G, Zafiriadis I, Aivasidis A. Upgrading the efficiency of an external nitrification BNR system – The modified Dephanox process[J]. Chemical Engineering Journal, 2011, 175(22):124-135.
[13]刘婧. 改良型双污泥系统反硝化除磷工艺的试验研究[D].哈尔滨工业大学,2008.
[14] 徐玉洁, 张雁秋, 杨德军,等. 改良型双污泥工艺处理低C/N城市污水[J]. 安徽农业科学, 2011,39(10):5992-5993.
[15] 杨鹏, 张朝升, 荣宏伟,等. 双污泥BCR反硝化同步脱氮除磷的试验研究[J]. 环境科学与技术, 2014,37(03) :74-77.
[1]华光辉,张波. 城市污水生物除磷脱氮工艺中的矛盾关系及对策[J]. 给水排水, 2002,26(12) : 1-4.
[2]张洁,胡卫新,张雁秋. 改进型双泥反硝化除磷脱氮工艺——一种可望从根本上解决脱氮除磷矛盾的新工艺[J]. 环境污染与防治, 2005, 27(3):232-235.
[3] Zuthi M F R, Guo W S, Ngo H H, et al. Enhanced biological phosphorus removal and its modeling for the activated sludge and membrane bioreactor processes[J]. Bioresource Technology, 2013, 139(13):363-374.
[4] Marcelino M ,, Wallaert D ,, Guisasola A ,, et al. A two-sludge system for simultaneous biological C, N and P removal via the nitrite pathway.[J]. Water Science & Technology A Journal of the International Association on Water Pollution Research, 2011, 64(5):1142-7.
[5] Kapagiannidis A G, Zafiriadis I, Aivasidis A. Effect of basic operating parameters on biological phosphorus removal in a continuous-flow anaerobic-anoxic activated sludge system.[J]. Bioprocess & Biosystems Engineering, 2012, 35(35):371-82.
[6]刘莹,彭永臻,王淑莹. A_2N工艺的固有弊端分析及其对策研究[J]. 工业用水与废水,2010,41(6):1-5.
[7]王亚宜,王淑莹,彭永臻. MLSS、pH及NO_2~--N对反硝化除磷的影响[J]. 中国给水排水, 2005, 21(7):47-51.
[8]朱文韬,吕锡武,史静. 电子受体和MLSS对反硝化除磷的影响[J]. 净水技术, 2014,33(5):31-37.
[9]吕娟. NO_2~--N、MLSS对反硝化脱氮除磷的影响[J]. 水资源与水工程学报, 2014,25(5):207-210.
[10]李相昆,姜安玺,于健,等.连续流双污泥反硝化同时除磷系统影响因素[J].沈阳建筑大学学报,2005,21(5):560-563.
[11]杨庆娟,王淑莹,刘莹,袁志国. 污泥回流比对A_2N反硝化除磷工艺脱氮除磷的影响[J]. 中国给水排水, 2008, 24(13):37-41.
[12] Kapagiannidis A G, Zafiriadis I, Aivasidis A. Upgrading the efficiency of an external nitrification BNR system – The modified Dephanox process[J]. Chemical Engineering Journal, 2011, 175(22):124-135.
[13]刘婧. 改良型双污泥系统反硝化除磷工艺的试验研究[D].哈尔滨工业大学,2008.
[14] 徐玉洁, 张雁秋, 杨德军,等. 改良型双污泥工艺处理低C/N城市污水[J]. 安徽农业科学, 2011,39(10):5992-5993.
[15] 杨鹏, 张朝升, 荣宏伟,等. 双污泥BCR反硝化同步脱氮除磷的试验研究[J]. 环境科学与技术, 2014,37(03) :74-77.
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