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.
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℃,p H 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: 1 the 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 p H 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 p H 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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2015年第8期2926-2933,共8页
Environmental Science
基金
国家自然科学基金项目(51308025)
北京高等学校青年英才计划项目(YETP1649)
