Optimisation of an original CO2-Enhanced natural treatment system for reclaiming and reusing anaerobically digested strong wastewater from animal breeding industry

文献类型： 外文期刊

第一作者： Chen, Xiaochen

作者： Chen, Xiaochen;Xiao, Liang;Chen, Biao;Fukushi, Kensuke;Zhang, Jianyu;Niu, Jia;Xu, Kaiqin

作者机构：

关键词： Enhanced natural treatment system; Red ball earth; Kentucky bluegrass; Wastewater reclamation and reuse; Nutrient recovery; CO2 emission reduction

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：9.297； 五年影响因子：9.444 ）

ISSN： 0959-6526

年卷期： 2021 年 291 卷

页码：

收录情况： SCI

摘要： Strong wastewater from the animal breeding industry threatens the environmental and human health, while the widely used anaerobic digestion treatment is insufficient. To achieve the reclamation and reuse of the effluent containing an excessively high amount of nutrients (N, P and K) and a certain extent of biochemical oxygen demand (BOD), an original CO2-enhanced natural treatment system was put forward, which was composed of trickling filter and soil-plant units installed inside an elaborate greenhouse with an elevated CO2 concentration. On the basis of previous feasibility studies, an investigation on the system's limitations and potential were carried out for further optimisation, in which red ball earth Kentucky bluegrass column tests were conducted at the recommended CO2 concentration of 1,400 ppm for two specific scenarios, i.e. high BOD concentration and increasing hydraulic and nutrient loading rates. N is the most critical factor determining the effect and efficiency of the system, and results confirmed that, to establish a satisfactory nitrification function in the soil for N removal, adequate BOD reduction prior to land application was indispensable. Optimal operational strategies and parameters, as well as design information for scale-up, are also discussed. By means of nutrient balance approximation, the system's significant capabilities of removing and recovering waterborne nutrients are further presented, specifically complete removal of both N and P, and 8%, 18% and 18% recovery rates for N, P and K, respectively. Meanwhile, carbon balance analysis reveals its potential for substantially reducing greenhouse gas emission, as 9% of the input waterborne C is sequestrated for establishing plant biomass and maintaining greenhouse CO2 concentration at the designated level. More importantly, the above are realised in a highly profitable manner, as the value of the high-quality turf product can be an order of magnitude higher than the cost for system operation and maintenance. This original system provides an innovative way for rural communities worldwide to achieve sustainable development via wastewater reclamation and reuse. (C) 2021 Elsevier Ltd. All rights reserved.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序