Abstract:

The annual loss of autotrophic denitrification filler used in a municipal sewage treatment plant is more than 20%, the effluent pH is low, and the alkali needs to be supplemented, and the overall cost is high. In this study,sulfur, calcium carbonate and degradable polymers were used as the main raw materials to sulfur-degradable prepare composite biological fillers(SPCBF) by melt extrusion. The effects of HRT, TN concentration in influent water and SPCBF composition on the decontamination performance were investigated. The results showed that when the HRT was 4 h and the influent TN was 22-32 mg/L and 52-62 mg/L, the TN removal rates of the effluent were 87.50% and 86.36%. The higher the ratio of sulphide minerals, the better the effect of phosphorus removal. The addition of degradable polymer in SPCBF enhanced the strength of the filler, and the loss rate was less than 2% after 160 days. SPCBF could play a role of slow-release carbon source through its own degradation,and constitute a sulfur autotrophic-heterotrophic synergistic denitrification system. The pH of the effluent was stable at 7.23-7.54, and the whole reaction process did not need additional carbon source, and the operating cost was low.

Key words: sulfur autotrophic denitrification, composite biofillers, sulfur, synergistic denitrification system

摘要：

某市政污水处理厂现使用的自养反硝化填料年损耗超20%，出水pH低，需要补加碱回调，整体成本较高。利用硫磺、复合碳酸钙、可降解高分子材料为主要原料独创性地通过熔融挤出法制得硫磺-可降解高分子复合生物填料（SPCBF），分别考察HRT、进水TN、SPCBF组成等因素对反应器除污染性能的影响。结果表明，当HRT为4 h，进水TN分别为22~32 mg/L和52~62 mg/L时，出水TN去除率分别为87.50%和86.36%；硫化矿物占比越高，对除磷的效果越好；SPCBF中添加的可降解高分子材料增强了填料的强度，160 d的运行损耗率低于2%；SPCBF填料可通过自身的降解起到缓释碳源的作用，构成了硫自养-异养协同反硝化体系，出水pH稳定在7.23~7.54，整个反应过程无需外加碳源，运行成本低廉。

关键词: 硫自养反硝化, 复合生物填料, 硫磺, 协同反硝化体系

CLC Number: 

• X703.1