Can constructed wetlands be more land efficient than centralized wastewater treatment systems? A case study based on direct and indirect land use
Can constructed wetlands be more land efficient than centralized wastewater treatment systems? A case study based on direct and indirect land use
复制标题
人工湿地能否比集中式废水处理系统更有效地利用土地？
DOI：
10.1016/j.scitotenv.2020.144841
复制
发表时间：
2021
影响因子：
9.8
通讯作者：
Chen Guoqian
中科院分区：
文献类型：
--
作者：
Fan Ying;Wu Xudong;Shao Ling;Han Mengyao;Chen Bin;Meng Jing;Wang Ping;Chen Guoqian
与集中式污水处理系统相比，人工湿地由于直接占地面积较大，一般被认为不适合大规模部署。许多传统的想法是基于现场的观点，而场外的信息被遗漏了。本研究通过对现场和非现场土地使用的系统核算的比较案例研究，质疑了传统的图片，并发现人工湿地可以比集中式污水处理系统更有效地利用土地。以污水处理单元为单位，我国典型人工湿地系统的土地利用量不到集中式污水处理厂或混合系统的一半。以生物需氧量（BOD5）、化学需氧量（COD）、总悬浮物（TSS）和氨氮（NH3−N）的单位去除率为基础，人工湿地的土地利用率分别仅为集中式污水处理系统的61%、67%、73%和64%左右。同时，这三个系统的间接影响被证明是显着的：这一数量级的人工湿地的直接占地的3倍，和一个数量级以上的集中式污水处理系统。通过对中国2017年的情景分析，初步估计，如果所有的集中式污水处理系统都被人工湿地取代，可以减少20亿平方米的土地使用。研究结果可以作为一个基准，并为污水处理系统的管理提供了一种新的思路。
Compared with centralized wastewater treatment systems, constructed wetlands are generally regarded as not suitable for wide deployment due to the comparatively larger direct land area. Much of the traditional thinking is based on an onsite perspective, while the offsite information is left out. By a comparative case study with systems accounting of both onsite and offsite land use, this study questioned the traditional picture and found that constructed wetlands can be more land use efficient than centralized wastewater treatment systems. On a unit of wastewater treated basis, the land use induced by a typical constructed wetland in China is revealed to be less than half of that by the case of a centralized wastewater treatment plant or a hybrid system. On a unit removal basis for biological oxygen demand (BOD5), chemical oxygen demand (COD), total suspended solid (TSS) and ammonia‑nitrogen (NH3−N), the land use induced by a constructed wetland is only around 61%, 67%, 73% and 64% of that by a centralized wastewater treatment system, respectively. Meanwhile, the indirect effect is demonstrated to be significant for these three systems: this magnitude amounts to three times the direct land occupation for a constructed wetland, and one order of magnitude higher of that for the a centralized wastewater treatment system. By a scenario analysis for China in 2017, it is preliminarily estimated that over two billion square meters of land use could be reduced if all the centralized wastewater treatment systems are replaced by constructed wetlands. The outcome may serve a benchmark and offers a new way of thinking for management of wastewater treatment systems.