| 生物膜CANON反应器中沉积物影响及其成因分析 |
| 摘要点击 2901 全文点击 1538 投稿时间：2015-01-27 修订日期：2015-03-17 |
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| 中文关键词 CANON 高氨氮废水 沉积物 亚硝酸盐 碳酸钙 生物膜 |
| 英文关键词 CANON ammonium-rich wastewater precipitation nitrite calcium carbohydrate biofilm |
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| 中文摘要 |
| 以人工配制无机高氨氮废水为对象,通过CANON接种污泥,以聚氨酯海绵为填料,在HRT=9 h,温度为30℃±1℃,pH为6.92~8.52的条件下运行.针对反应器中填料表面的沉积物,试验研究沉积物对CANON工艺的影响及其成分、形成原因. 研究发现:1沉积物影响基质的传递,导致CANON反应器中去除效果不佳且反应器中的生物量下降; 2沉积物成分是碳酸钙; 3填料表面形成沉积物可能是微生物的pH调节作用、吹脱作用、胞外聚合物作用、海绵的吸附作用和物理化学作用的共同结果; 4沉积物一旦形成,很难恢复.因此,为了避免沉积物的产生而又不影响CANON工艺,建议采取以下措施:1对原水进行预处理,降低Ca2+和Mg2+等的浓度,2保证短程硝化效果完好,避免因短程硝化效果破坏而要降低DO,造成pH升高,并导致沉积物产生; 3在保证反应器良好的总氮处理效果、稳定的短程硝化下,可选用其他合适的填料,以减缓沉积物的积累程度. |
| 英文摘要 |
| A CANON reactor with polymeric sponge as carrier was started by incubating sludge from another CANON reactor using synthetic inorganic ammonia-rich wastewater as raw water, and was operated at 30℃±1℃, pH 6.92-8.52. The precipitation on the surface of carriers was studied in this paper, including influence on nitrogen removal efficiency, causes for formation and composition. The results showed that: 1the precipitation could influence the distribution of substrate to undermine the performance of CANON reactors; 2the precipitation was calcium carbohydrate; 3the production of precipitation may be a common result of four effects that were the regulatory effect of microorganisms on pH value, stripping effect, the role of extracellular polymers, adsorption of sponge and simultaneous chemical, biological reactions; 4once the precipitation formed, it was difficult to recover to normal. Therefore, some measures are necessary to avoid precipitation, including: 1raw water pretreatment to reduce the concentrations of Ca2+ and Mg2+; 2ensuring short-cut nitrification stable, which could avoid increase of pH because of reduction of DO; 3we can choose other carriers to reduce precipitation, which must ensure the optimal total nitrogen removal performance and stable short-cut nitrification. |
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