中低温下MBBR在处理城市污水的中试及生产中的应用研究
摘要
随着工业的迅速发展,人口急剧增长和生活水平提高,需水量增长迅速,然而我国水资源水质恶化现象严重,这与城市污水处理率低、达标率不高、污染物排放总量超标密切相关。因此,提高城市污水的排放标准及污水处理率、再生水回用是保证水资源可持续发展的必要条件。然而,20世纪建造的许多污水处理厂难以满足新的排放标准,尤其是脱氮除磷的要求。
论文采用移动床生物膜反应器(MBBR)与厌氧/好氧(A/O)复合工艺对其在中试和营口西部污水处理厂生化池改造的生产运行中的效果进行了研究,重点考察了小于15℃的中低温下的污染物去除情况。
通过小试研究了BioMTM生物悬浮填料的充氧性能,并从经济性考虑,确定了合理的填料投加率为40%;在两段式MBBR中试工艺中通过改变溶解氧、进水量两个指标,重点考察了低温下脱氮的情况。结果表明,在5~12℃低温下,HRT为7.2h,好氧1、2段溶解氧分别为3~4mg/L、1~2mg/L ,表面有机负荷为8.5COD/(m2·d)、表面氨氮负荷率平均为1.4gNH4+-N/(m2·d)、表面总氮负荷为1.76gTN/(m2·d)时,出水COD、氨氮、总氮均能达到或接近于一级A标准,并证明了通过控制溶解氧实现稳定的同步硝化反硝化的可行性;同时,在微搅拌下A/O与MBBR复合中试工艺中,利用折流板反应器的特点,通过改变回流比、进水量两个指标,研究在较小的厌氧池搅拌强度下工艺的脱氮除磷效果。结果表明,在小于12℃低温下,当HRT为8.7h、回流比为70%时,该复合工艺出水COD、氨氮、总氮、总磷均能达到一级A标准。
论文还重点研究了A/O与MBBR复合工艺在营口西部污水处理厂生化池改造工程的应用效果,考察了不同温度、不同填料投加率对脱氮除磷的影响。结果表明,当水温低于12℃时,在HRT为7h、回流比为70%的条件下生化池出水COD、氨氮均能达到一级A标准;在HRT为8h时,出水总氮能达到一级A标准;有机负荷为0.22kgBOD5/(kgMLSS·d),BOD5/TP为48的低温下,除磷效果良好。显示了该改造工艺相对于传统活性污泥工艺的优越性。最后指出了推流式MBBR在工程中存在的一些问题及其解决方案。
As the rapid development of industry, the sharp increasing of population and the improvement of the standards of living, the want for water is also rapidly increasing. However, it is serious that the water quality in China is deteriorating, which is in correlation with low removal efficiency of municipal wastewater, low efficiency of meeting the State’s discharge standards and exceeding in the total pullutants discharge. So it is necessary to improve the discharge standard and removal efficiency of municipal wastewater, and reclaim water reuse for keeping sustainable development of water resource. But it is difficult to meet the new standard, expecially the standard of denitrification and phosphorus removal for many wastewater treatment plants built in the twentieth century.
The effect of operation of the process of MBBR and A/O used in pilot-scale and the practical transforming project in the Yingkou wastewater treatment plant was studied. It was concentrated on the removal of pullutant in middle and low temperatue, which is lower than 15℃.
Firstly, the oxygenation capacity of the BioMTM Suspended Carriers was researched in small-scale and it was determinated that the rational holdup was 40% by considering economy. Secondly, Oxygen Demonad (DO) and influent quantity were changed in the two-stage MBBR process in pilot-scale. It was concentrated on the removal of nitrogen in middle and low temperatue. The results shows that COD, NH4+-N, TN in effluent all can meet or approach the 1th A standard in low temperature between 5℃and 12℃, HRT of 7.2h, DO of 3~4mg/L and 1~2mg/L in the two parts of the reator, surface organic loading of 1.76gTN/(m2·d), surface NH4+-N’s loading of 1.4gNH4+-N/(m2·d), surface TN’s loading of 1.4gTN/(m2·d). It was testified that it was possible to achive stable SND. On the operation of this process, in the process of MBBR and A/O in microblending which made use of the character of ABR, the effect of denitrification and phosphorus removal were studied in small stirring intensity in anaerobic reactor by changing the value of reflux ratio and influent quantity. The results indicated that COD, NH4+-N, TN in effluent all can meet the 1th A standard in low temperature that was lower than 12℃, HRT of 8.7h, reflux ratio of 70%.
The effect of operation of the process of MBBR and A/O used in the practical transforming project in the Yingkou wastewater treatment plant was studied. The influence of temperature and holdup on denitrification and phosphorus removal were expecially invested. The results showed that COD, NH4+-N in effluent all can meet the 1th A standard in low temperature that was lower than 12℃, HRT of 7h, reflux ratio of 70%; TN in effluent all can meet the 1th A standard in low temperature with HRT of 8h; the effect of phosphorus removal was well in organic loading of 0.22kgBOD5/(kgMLSS·d), the ratio of BOD5/TP of 48. It indicated that this transforming process was better than the traditional process of activated sludge. Finally, some problems and their solutions of MBBR that was in plug flow were pointed out.
论文采用移动床生物膜反应器(MBBR)与厌氧/好氧(A/O)复合工艺对其在中试和营口西部污水处理厂生化池改造的生产运行中的效果进行了研究,重点考察了小于15℃的中低温下的污染物去除情况。
通过小试研究了BioMTM生物悬浮填料的充氧性能,并从经济性考虑,确定了合理的填料投加率为40%;在两段式MBBR中试工艺中通过改变溶解氧、进水量两个指标,重点考察了低温下脱氮的情况。结果表明,在5~12℃低温下,HRT为7.2h,好氧1、2段溶解氧分别为3~4mg/L、1~2mg/L ,表面有机负荷为8.5COD/(m2·d)、表面氨氮负荷率平均为1.4gNH4+-N/(m2·d)、表面总氮负荷为1.76gTN/(m2·d)时,出水COD、氨氮、总氮均能达到或接近于一级A标准,并证明了通过控制溶解氧实现稳定的同步硝化反硝化的可行性;同时,在微搅拌下A/O与MBBR复合中试工艺中,利用折流板反应器的特点,通过改变回流比、进水量两个指标,研究在较小的厌氧池搅拌强度下工艺的脱氮除磷效果。结果表明,在小于12℃低温下,当HRT为8.7h、回流比为70%时,该复合工艺出水COD、氨氮、总氮、总磷均能达到一级A标准。
论文还重点研究了A/O与MBBR复合工艺在营口西部污水处理厂生化池改造工程的应用效果,考察了不同温度、不同填料投加率对脱氮除磷的影响。结果表明,当水温低于12℃时,在HRT为7h、回流比为70%的条件下生化池出水COD、氨氮均能达到一级A标准;在HRT为8h时,出水总氮能达到一级A标准;有机负荷为0.22kgBOD5/(kgMLSS·d),BOD5/TP为48的低温下,除磷效果良好。显示了该改造工艺相对于传统活性污泥工艺的优越性。最后指出了推流式MBBR在工程中存在的一些问题及其解决方案。
As the rapid development of industry, the sharp increasing of population and the improvement of the standards of living, the want for water is also rapidly increasing. However, it is serious that the water quality in China is deteriorating, which is in correlation with low removal efficiency of municipal wastewater, low efficiency of meeting the State’s discharge standards and exceeding in the total pullutants discharge. So it is necessary to improve the discharge standard and removal efficiency of municipal wastewater, and reclaim water reuse for keeping sustainable development of water resource. But it is difficult to meet the new standard, expecially the standard of denitrification and phosphorus removal for many wastewater treatment plants built in the twentieth century.
The effect of operation of the process of MBBR and A/O used in pilot-scale and the practical transforming project in the Yingkou wastewater treatment plant was studied. It was concentrated on the removal of pullutant in middle and low temperatue, which is lower than 15℃.
Firstly, the oxygenation capacity of the BioMTM Suspended Carriers was researched in small-scale and it was determinated that the rational holdup was 40% by considering economy. Secondly, Oxygen Demonad (DO) and influent quantity were changed in the two-stage MBBR process in pilot-scale. It was concentrated on the removal of nitrogen in middle and low temperatue. The results shows that COD, NH4+-N, TN in effluent all can meet or approach the 1th A standard in low temperature between 5℃and 12℃, HRT of 7.2h, DO of 3~4mg/L and 1~2mg/L in the two parts of the reator, surface organic loading of 1.76gTN/(m2·d), surface NH4+-N’s loading of 1.4gNH4+-N/(m2·d), surface TN’s loading of 1.4gTN/(m2·d). It was testified that it was possible to achive stable SND. On the operation of this process, in the process of MBBR and A/O in microblending which made use of the character of ABR, the effect of denitrification and phosphorus removal were studied in small stirring intensity in anaerobic reactor by changing the value of reflux ratio and influent quantity. The results indicated that COD, NH4+-N, TN in effluent all can meet the 1th A standard in low temperature that was lower than 12℃, HRT of 8.7h, reflux ratio of 70%.
The effect of operation of the process of MBBR and A/O used in the practical transforming project in the Yingkou wastewater treatment plant was studied. The influence of temperature and holdup on denitrification and phosphorus removal were expecially invested. The results showed that COD, NH4+-N in effluent all can meet the 1th A standard in low temperature that was lower than 12℃, HRT of 7h, reflux ratio of 70%; TN in effluent all can meet the 1th A standard in low temperature with HRT of 8h; the effect of phosphorus removal was well in organic loading of 0.22kgBOD5/(kgMLSS·d), the ratio of BOD5/TP of 48. It indicated that this transforming process was better than the traditional process of activated sludge. Finally, some problems and their solutions of MBBR that was in plug flow were pointed out.
引文
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