河涌污水氨氮去除研究.doc
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1、摘 要城市河涌污染已经严重威胁到城市的水资源和居民的身体健康,并且成为地区可持续发展的制约因素。采取有效的技术和措施治理河涌污染势在必行。本文针对污染河涌的特点,建立一个中试规模的河道模拟装置,将“生物基+复合优势菌+微孔软管曝气”条件相结合,采用生物基接触氧化工艺处理黑臭水沟污水,通过对污水及其中微生物的长期连续实验监测,探讨了该工艺的技术可行性及污染物的去除效果。结果表明,生物基接触氧化技术NH3-N有良好的去除作用,进水NH3-N值为2040mg/L,出水NH3-N值一般维持在0.5mg/L左右,去除率达到90以上,符合地表水的类水标准。但当原水NH3-N浓度大于60mg/L时,硝化细菌
2、会受到冲击,去除率降低。由于生物膜厚度的增加,传质阻力增大,溶解氧宜维持在34mg/L之间。生物膜增加后,内部形成厌氧层,有一定的反硝化作用,TN去除率有30%左右。本试验采用的填料对悬浮生物胶团有很强的截流吸附能力,生物胶团缠绕包裹填料丝生长,到挂摸后期形成丝状的骨架结构,有利于氧和营养物的吸附传递关键词:河涌污染,生物膜,接触氧化,氨氮去除AbstractThe city river pollution has caused the water resource problem, affected the citizens health, and also limits the conti
3、nual development of the area. To control the city river pollution, effective measures must be made under such situation.According to the river characteristic, we made a pilot test river model, using the bio-film contact oxidation technique to treat the sewage water, with bio-film carrier, hybrid sup
4、er bacteria and microporous tube aeration. This experiment would find out the mechanism of the bio-film contact oxidation and assess the pollution removal efficiency.The results indicated that: Bio-film contact oxidation has good effect in NH3-N removal, the influent NH3-N concentration is 2040mg/L,
5、 the effluent NH3-N concentration is 0.5mg/L, it has 90% removal, and the effluent water is accordance with the surface water five grade standard. But while the influent NH3-N concentration higher than 60mg/L, the nitrify system would be destroy, and the removal efficiency is low. Because the bio-fi
6、lm became thick, the mass transfer resistance rised, so the best DO level is between 3-4mg/L. While the bio-film became big, the bio-film inner has anaerobic layer which had denitrify effect, so the TN has 30% removal. The bio-film carrier we used could closure the zoogloea, and the zoogloe adhered
7、at the carrier to grow up. After a mouth, the zoogloe look like a filiform frame. Such frame can adhere the pollutants and is good for the bio-film grow. Keywords: polluted river,bio-film,contact oxidation, removal of ammonia-nitrogen目 录1 绪论1 1.1 题目背景及目的1 1.2 国内外研究状况2 1.2.1 底泥生态疏浚2 1.2.2 河道曝气技术4 1.2
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