Zeng Long-Yun, Yang Chun-Ping, Guo Jun-Yuan, Luo Sheng-Lian
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Huan Jing Ke Xue. 2012 Jan;33(1):197-202.
Under intermittent aerated and continuous fed operation where the biofilm system was subjected to alternated anaerobic/aerobic condition, the effect of influent volatile fatty acids (VFAs) concentrations, operation cycle and backwash on the biological phosphorus removal performance of the biofilter was studied. In the experiment, synthetic domestic wastewater was used, and the influent velocity was 5 L x h(-1) with gas versus liquid ratio of 8:1 and hydraulic retention time (HRT) of 1.3 h, resulting in average COD, ammonium and phosphorus load of 4.7, 0.41 and 0.095 g x (L x d) (-1) respectively. Results show that, (1) effective release and uptake of phosphorus was achieved in a operation cycle; (2) when influent VFAs was 100 mg x L(-1) (calculated by COD value) and operation cycle was 6 h the filter performed best in phosphorus removal, the phosphorus loading removal rate can be as much as 0.059 g x (L x d)(-1) at the aerated phase with those of COD and ammonium being 3.8 g x (L x d)(-1) and 0.28 g x (L x d)(-1) respectively, and with average effluent phosphorus, COD and ammonium concentrations being 1.8, 43.6 and 8.7 mg x L(-1), which shows nitrogen loss also happened; (3) the pause of backwash decreased the phosphorus removal performance rapidly with the removal efficiency lower than 40% in two days, but the consequent daily backwash operation gave a short improvement on the phosphorus removal, which disappeared in another two days. Thus, it is shown that biological phosphorus removal achieved with better phosphorus loading removal performance in the biofilter under intermittent aerated and continuous fed operation, and that sufficient and stable influent VFAs concentration, proper operation cycle, and more frequent backwash favored the performance.
在间歇曝气和连续进水运行模式下，生物膜系统处于交替厌氧/好氧条件，研究了进水挥发性脂肪酸（VFAs）浓度、运行周期和反冲洗对生物滤池生物除磷性能的影响。实验采用合成生活污水，进水流量为5 L·h⁻¹，气液比为8:1，水力停留时间（HRT）为1.3 h，平均COD、铵和磷负荷分别为4.7、0.41和0.095 g·(L·d)⁻¹。结果表明，（1）在一个运行周期内实现了磷的有效释放和吸收；（2）当进水VFAs为100 mg·L⁻¹（按COD值计算）且运行周期为6 h时，滤池除磷效果最佳，曝气阶段磷负荷去除率可达0.059 g·(L·d)⁻¹，此时COD和铵的去除率分别为3.8 g·(L·d)⁻¹和0.28 g·(L·d)⁻¹，平均出水磷、COD和铵浓度分别为1.8、43.6和8.7 mg·L⁻¹，表明同时发生了氮损失；（3）反冲洗暂停会迅速降低除磷性能，两天内去除效率低于40%，但随后的每日反冲洗操作使除磷有短暂改善，两天后又消失。因此，表明在间歇曝气和连续进水运行条件下，生物滤池能实现具有较好磷负荷去除性能的生物除磷，充足且稳定的进水VFAs浓度、合适的运行周期和更频繁的反冲洗有利于该性能。
