Buchanan Neil, Young Paul, Cromar Nancy J, Fallowfield Howard J
Health and Environment Group, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide 5001, Australia E-mail:
Water Sci Technol. 2018 Aug;78(1-2):3-11. doi: 10.2166/wst.2018.201.
South Australian community wastewater management schemes (CWMS) treat wastewater using waste stabilisation ponds before disposal or reuse. This study compared the performance of a facultative pond, 6,300 m, 27.5 d theoretical hydraulic retention time (THRT), with a high rate algal pond (HRAP) operated at depths of 0.32, 0.43 and 0.55 m with THRT equivalent to 4.5, 6.4 and 9.1 d respectively. Both ponds received influents of identical quality, differing only in quantity, and were operated in similar climatic conditions. The depth of HRAP operation had only a minor influence on treatment performance. The study showed that the quality of the treated effluent from the HRAP was equivalent to that of the facultative pond, 5-day biochemical oxygen demand removal >89%, NH-N removal 59.09-74.45%. Significantly, Escherichia coli log reduction values by the HRAP, 1.74-2.10, were equivalent to those of the facultative pond. Consequently, HRAPs could replace facultative ponds within CWMS while maintaining treated effluent quality. The benefit would be halving the surface area requirement from 4.2 m capita for the facultative pond to between 2.0 and 2.3 m capita, depth dependent, for an HRAP, with significant attendant reductions in the capital costs for construction.
南澳大利亚社区废水管理计划（CWMS）在废水排放或再利用之前，使用废物稳定塘对其进行处理。本研究比较了一个面积为6300平方米、理论水力停留时间（THRT）为27.5天的兼性塘，与一个在深度为0.32米、0.43米和0.55米下运行的高速藻类塘（HRAP）的性能，其THRT分别相当于4.5天、6.4天和9.1天。两个池塘接收的进水水质相同，仅数量不同，且在相似的气候条件下运行。HRAP的运行深度对处理性能影响较小。研究表明，HRAP处理后的出水水质与兼性塘相当，五日生化需氧量去除率>89%，氨氮去除率为59.09 - 74.45%。值得注意的是，HRAP对大肠杆菌的对数减少值为1.74 - 2.10，与兼性塘相当。因此，在维持处理后出水水质的同时，HRAP可以替代CWMS中的兼性塘。好处是将占地面积需求减半，从兼性塘的人均4.2平方米降至HRAP的人均2.0至2.3平方米（取决于深度），同时建设成本也会大幅降低。
