García-Pérez Alfredo, Harrison Mark, Grant Bill
LaGrange County Health Department, Environmental Health Office, LaGrange, IN 46761-1319, USA.
J Environ Health. 2009 Nov;72(4):17-20.
Subsurface constructed wetlands using a recirculating vertical flow are a viable alternative technology to pretreating conventional residential septic systems effluents before underground discharge. The authors examined performance of a recirculating vertical flow constructed wetland (RVFCW) to treat both human and domestic animal sewage from the LaGrange County (Indiana) Animal Shelter. Effluent water samples were analyzed for the five-day biochemical oxygen demand (BOD5), total suspended solids (TSS), ammonia-nitrogen (AN), total Kjeldhal nitrogen (TKN), total nitrogen (TN), nitrate-nitrogen, total phosphorus (TP) and fecal coliform bacteria (FC). Treatment efficiencies (percentage removal) after a two-year operation were high for BOD5 (99%), TSS (98%), AN (96%), TKN (94%), TN (83%), and FC (99%). Nitrate-nitrogen final mean value was 6.8 mg/L, dissolved oxygen concentration increased from 1.8 to 4.3 mg/L, and removal efficiency for total phosphorus was low (33%). These results show that vertical flow constructed wetlands are a green alternative to remove pollutants generated for both human and domestic animals.
采用循环垂直流的地下人工湿地是一种可行的替代技术，可用于在地下排放前对传统住宅化粪池系统的废水进行预处理。作者研究了一个循环垂直流人工湿地（RVFCW）处理来自印第安纳州拉格兰奇县动物收容所的人类和家畜污水的性能。对出水水样进行了五日生化需氧量（BOD5）、总悬浮固体（TSS）、氨氮（AN）、凯氏氮（TKN）、总氮（TN）、硝酸盐氮、总磷（TP）和粪大肠菌群（FC）的分析。经过两年运行后，BOD5（99%）、TSS（98%）、AN（96%）、TKN（94%）、TN（83%）和FC（99%）的处理效率（去除百分比）很高。硝酸盐氮最终平均值为6.8毫克/升，溶解氧浓度从1.8毫克/升增加到4.3毫克/升，总磷去除效率较低（33%）。这些结果表明，垂直流人工湿地是去除人类和家畜产生的污染物的一种绿色替代方案。
