低温条件下复合铁酶促对活性污泥系统脱氮除磷效果的影响
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摘要
为解决低温条件下活性污泥系统普遍存在的生化反应速率低的问题,在倒置A~2/O工艺中考察了低温条件下复合铁酶促对活性污泥脱氮除磷效果的影响,探究了系统中的氮磷转化规律。研究表明:与普通活性污泥系统相比,复合铁酶促活性污泥系统表现出更好的低温适应能力,脱氮除磷效果更佳,运行更为稳定;当温度为8℃时,普通活性污泥系统的氨氮平均去除率仅为31.4%,而复合铁酶促活性污泥系统的氨氮去除率仍然可以维持在72.0%左右;通过投加碳源可以显著提高磷酸盐的去除率,复合铁酶促活性污泥系统和普通活性污泥系统磷酸盐去除率分别为97.5%和89.0%,在低温条件下,复合铁酶促活性污泥系统的比硝化速率是普通活性污泥系统的1.6倍,但其厌氧释磷量和好氧吸磷量均较低。复合铁酶作用可有效改善活性污泥系统在低温环境的脱氮除磷效果。
To solve the problem of low biochemical reaction rate in activated sludge system at low temperature, this study investigated the effect of composite iron enzyme catalyst on the nitrogen and phosphorus removal in the inverted A~2/O process, and the nitrogen and phosphorus transformation pattern was further explored. The results showed that, compared with the conventional activated sludge(CAS) system, the composite iron enzymatic activated sludge(CIEAS) system behaved better adaptability to low temperature, with higher nitrogen and phosphorus removal rate and more stable operation. When the temperature was at 8 ℃, the average ammonia nitrogen removal rate of the CAS system was only 31.4%, compared with around 72.0% of the CIEAS system. Carbon source supplement could significantly improve the phosphate removal rate, resulting in 97.5% and 89.0% in CIEAS system and CAS system respectively. At the low temperature, the specific nitrification rate in the CIEAS system was 1.6 times of that of the CAS system, but with lower phosphorus anaerobic release and aerobic uptake amounts. Composite iron enzymatic action could effectively improve the removal effect of nitrogen and phosphorus in the activated sludge system at low temperature.
To solve the problem of low biochemical reaction rate in activated sludge system at low temperature, this study investigated the effect of composite iron enzyme catalyst on the nitrogen and phosphorus removal in the inverted A~2/O process, and the nitrogen and phosphorus transformation pattern was further explored. The results showed that, compared with the conventional activated sludge(CAS) system, the composite iron enzymatic activated sludge(CIEAS) system behaved better adaptability to low temperature, with higher nitrogen and phosphorus removal rate and more stable operation. When the temperature was at 8 ℃, the average ammonia nitrogen removal rate of the CAS system was only 31.4%, compared with around 72.0% of the CIEAS system. Carbon source supplement could significantly improve the phosphate removal rate, resulting in 97.5% and 89.0% in CIEAS system and CAS system respectively. At the low temperature, the specific nitrification rate in the CIEAS system was 1.6 times of that of the CAS system, but with lower phosphorus anaerobic release and aerobic uptake amounts. Composite iron enzymatic action could effectively improve the removal effect of nitrogen and phosphorus in the activated sludge system at low temperature.
引文
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[7] 王亚娥, 翟思媛, 耿牧歌,等. pH及磷浓度对活性污泥铁还原协同除磷的影响[J].环境工程学报, 2015, 9(8): 4002-4008.
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[9] Wu H, Ikeda-Ohno A, Wang Y, et al. Iron and phosphorus speciation in Fe-conditioned membrane bioreactor activated sludge[J]. Water Research, 2015, 76: 213-226.
[10] Smith J A, Carliell-Marquet C M. The digestibility of iron-dosed activated sludge[J]. Bioresource technology, 2008, 99(18): 8585-8592.
[11] Oikonomidis I, Burrows L J, Carliell-Marquet C M. Mode of action of ferric and ferrous iron salts in activated sludge[J]. Journal of Chemical Technology and Biotechnology, 2010, 85(8): 1067-1076.
[2] 任雪峰, 毕学军, 程丽华,等. 复合铁酶促活性污泥强化生物脱氮除磷研究[J]. 中国给水排水, 2011, 27(3): 24-28.
[3] 毕学军, 赵方超, 邢尚生,等. 复合铁酶促活性污泥抗低温硝化能力的研究[J]. 中国给水排水, 2013, 29(19): 18-21.
[4] 冯雷雨, 孙力平. 生物铁法处理维生素B1生产废水[J]. 中国给水排水, 2005, 21(12): 69-72.
[5] 刘长青, 张鹏, 毕学军,等. 复合铁酶促活性和普通活性污泥系统低温启动对比研究[J]. 水处理技术, 2011, 37(7): 78-82.
[6] 王秀蘅, 任南琪, 王爱杰,等. 铁锰离子对硝化反应的影响效应研究[J]. 哈尔滨工业大学学报, 2003, 35(1): 122-125.
[7] 王亚娥, 翟思媛, 耿牧歌,等. pH及磷浓度对活性污泥铁还原协同除磷的影响[J].环境工程学报, 2015, 9(8): 4002-4008.
[8] Saxe J P, Lubenow B L, Chiu P C, et al. Enhanced biodegradation of azo dyes using an integrated elemental iron-activated sludge system: II. Effects of physical-chemical parameters[J]. Water Environment Research, 2006, 78(1): 26-30.
[9] Wu H, Ikeda-Ohno A, Wang Y, et al. Iron and phosphorus speciation in Fe-conditioned membrane bioreactor activated sludge[J]. Water Research, 2015, 76: 213-226.
[10] Smith J A, Carliell-Marquet C M. The digestibility of iron-dosed activated sludge[J]. Bioresource technology, 2008, 99(18): 8585-8592.
[11] Oikonomidis I, Burrows L J, Carliell-Marquet C M. Mode of action of ferric and ferrous iron salts in activated sludge[J]. Journal of Chemical Technology and Biotechnology, 2010, 85(8): 1067-1076.