Constructed wetlands are one of the most viable wastewater treatment technologies, with an additional aspect of biomass production that could be utilized in the manufacturing of valuable products. With this objective, four species of divergent commercial plants were grown individually and polyculture in horizontal subsurface flow constructed wetlands (HSFCW). Rural sewage was supplied from a storage tank to each CW through the inlet chamber. The experiment was continued for 12 weeks (July to October). Collectively, the HSFCW having polyculture of plants was more effective in the removal of all pollutants. While monoculture of Ipomoea aquatica exhibited better performance for the reduction of chemical oxygen demand (COD) and nutrients, viz., total nitrogen (TN), total phosphorus (TP), ammonium nitrogen (NH₄⁺–N), and nitrate-nitrogen (NO₃̄–N) with a removal efficiency of 69, 77, 96, 90 and 80%, respectively. Whereas, Iris pseudacorus and Canna indica showed significantly better results for fecal coliform and total suspended solids reduction. At the last stage of the experiment, all plant species achieved the maximum growth rate; particularly, Ipomoea aquatica and polyculture or mixed planting (MP) had the highest growth rate and larger above-ground biomass. Thus, current findings reflect that MP wetland in wastewater treatment coupled with biomass production renders environmental and economic benefits.

人工湿地是最可行的废水处理技术之一，生物质生产的另一个方面可用于制造有价值的产品。为了这个目标，四种不同的商业植物在水平地下流人工湿地 (HSFCW) 中单独种植和混养。农村污水从一个储罐通过进水室供应到每个 CW。实验持续 12 周（7 月至 10 月）。总的来说，具有植物混养的 HSFCW 在去除所有污染物方面更有效。虽然单一栽培的番薯在降低化学需氧量 (COD) 和养分方面表现出更好的性能，即总氮 (TN)、总磷 (TP)、铵态氮 (NH)₄ ⁺ –N) 和硝态氮 (NO ₃ ̄–N) 的去除效率分别为 69、77、96、90 和 80%。而Iris pseudacorus和Canna indica在减少粪便大肠菌群和总悬浮固体方面表现出明显更好的结果。在实验的最后阶段，所有植物物种都达到了最大的生长速度；特别是，番薯与混养或混合种植（MP）的生长速度最高，地上生物量也更大。因此，目前的研究结果表明，污水处理中的 MP 湿地与生物质生产相结合，具有环境和经济效益。