摘要
与普通UASB反应器相比,厌氧膨胀颗粒污泥床(EGSB)停留时间短、降解效率高。废纸造纸废水经EGSB反应器处理后,有机污染物种类明显减少,废水可生化性得到提高,同时有中间代谢产物产生。反应器在35℃条件下、水力停留时间5.5 h、容积负荷23.1 kg/(m3·d)时,COD去除率达到最高为87.6%;反应器水力停留时间缩至4.4 h、容积负荷28.9 kg/(m3·d)时,COD去除效率仍然可以达到80%以上。EGSB反应器对温度变化比较敏感,通过降低系统容积负荷、提高进水碱度,可以提高系统在低温时的有机物降解效率。EGSB反应器污泥床的膨胀率与反应器的水力负荷及产气量有关,当污泥床得到充分膨胀,反应器内泥水混合程度进一步增强,反应器运行效果可得到有效提升;运行结束后,颗粒污泥粒径增大,活性显著提高,污泥床底部颗粒较大,上部污泥粒径较小。
Compared with ordinary UASB reactor, EGSB is characterized by short retention time and high degradation efficiency. After treatment by EGSB, the types of organic pollutants were obviously reduced with intermediate metabolite produced, and the biodegradability of the wastewater got enhanced. The removal rate of COD was highest to 87.6% in the conditions of 35 ℃, HRT 5.5 h, and volume load 23.1 kg/（m^3·d）. The removal rate of COD could reach above 80% even when HRT shorten to 4.4h and volume load increased to 28.9 kg/（m^3·d）. EGSB reactor is more sensitive to temperature changes. The degradation efficiency for organic compounds could be improved by reducing the system volume load and improving the influent alkalinity. The expansion rate of the sludge bed was related to hydraulic loading and gas production. When the sludge bed was fully expansive, the mix got further enhanced and the operation effect could be effectively improved. When operation was over, the particle size and activity of granular sludge increased, and the diameter of the granular sludge at the bottom of the sludge bed were larger than that in the upper part of the sludge bed.
出处
《环境科技》
2013年第6期21-25,共5页
Environmental Science and Technology
关键词
EGSB
废纸造纸废水
温度
营养元素
颗粒污泥
EGSB
Regenerated papermaking wastewater
Temperature
Nutrient elements
Granule sludge
