Treatment of domestic wastewater and extracellular polymeric substance accumulation in siphon-type composite vertical subsurface flow constructed wetland.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Cheng Jiang, Lin Qiu, Hao Wu, Fahui Nie, Yong Liu, Wenping Cao
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引用次数: 0

Abstract

In this study, the siphon-type composite vertical flow constructed wetland (Sc-VSsFCW) was constructed with anthracite and shale ceramsite chosen as the substrate bed materials. During the 90-day experiment, typical pollutant removal effects of wastewater and extracellular polymeric substance (EPS) accumulation were investigated. Meanwhile, X-ray diffraction and scanning electron microscopy were used to examine the phase composition and surface morphology to analyze adsorptive property. Additionally, we evaluated the impact of siphon effluent on clogging and depolymerization by measuring the EPS components' evolution within the system. The findings reveal that both the anthracite and shale ceramsite systems exhibit impressive removal efficiencies for total phosphorus (TP), total dissolved phosphorus (TDP), soluble reactive phosphorus (SRP), chemical oxygen demand (COD), ammonium nitrogen (NH4 +-N), and nitrate nitrogen (NO3 --N). However, as the experiment progressed, TP removal rates in both systems gradually declined because of the saturation of adsorption sites on the substrate surfaces. Although the dissolved oxygen (DO) levels remained relatively stable throughout the experiment, pH exhibited distinct patterns, suggesting that the anthracite system relies primarily on chemical adsorption, whereas the shale ceramsite system predominantly utilizes physical adsorption. After an initial period of fluctuation, the permeability coefficient and porosity of the system gradually stabilized, and the protein and polysaccharide contents in both systems exhibited a downward trend. The study underscores that anthracite and shale ceramsite have good effectiveness in pollutant removal as substrate materials. Overall, the hydraulic conditions of the double repeated oxygen coupling siphon in the Sc-VSsFCW system contribute to enhanced re-oxygenation capacity and permeability coefficient during operation. The changes in EPS content indicate that the siphon effluent exerts a certain depolymerization effect on the EPS within the system, thereby mitigating the risk of biological clogging to a certain extent. PRACTITIONER POINTS: The system can still maintain good pollutant treatment effect in long-term operation. The re-oxygenation method of the system can achieve efficient and long-term re-oxygenation effect. The siphon effluent has a certain improvement effect on the permeability coefficient and porosity, but it cannot effectively inhibit the occurrence of clogging. The EPS content did not change significantly during the operation of the system, and there was a risk of biological clogging.

虹吸式复合垂直地下流动人工湿地中的生活污水处理和细胞外高分子物质积累。
本研究以无烟煤和页岩陶土为基床材料,构建了虹吸式复合垂直流人工湿地(Sc-VSsFCW)。在为期 90 天的实验中,研究了废水和细胞外聚合物(EPS)积累对污染物的典型去除效果。同时,利用 X 射线衍射和扫描电子显微镜检查了相组成和表面形态,以分析吸附性能。此外,我们还通过测量 EPS 成分在系统中的演变,评估了虹吸管流出物对堵塞和解聚的影响。研究结果表明,无烟煤和页岩陶瓷石系统对总磷(TP)、总溶解磷(TDP)、可溶性活性磷(SRP)、化学需氧量(COD)、铵态氮(NH4 +-N)和硝态氮(NO3 -N)的去除率都很高。然而,随着实验的进行,由于基质表面的吸附位点达到饱和,两个系统的 TP 去除率都逐渐下降。虽然溶解氧(DO)水平在整个实验过程中保持相对稳定,但 pH 值却呈现出不同的模式,这表明无烟煤系统主要依靠化学吸附,而页岩陶瓷岩系统则主要利用物理吸附。经过最初一段时间的波动后,系统的渗透系数和孔隙率逐渐趋于稳定,两种系统中的蛋白质和多糖含量均呈下降趋势。该研究强调了无烟煤和页岩陶土作为基质材料具有良好的污染物去除效果。总体而言,Sc-VSsFCW 系统中双重复氧耦合虹吸管的水力条件有助于提高运行期间的再氧能力和渗透系数。EPS 含量的变化表明,虹吸出水对系统内的 EPS 有一定的解聚作用,从而在一定程度上减轻了生物堵塞的风险。实践点:系统长期运行仍能保持良好的污染物处理效果。系统的复氧方式可实现高效、长期的复氧效果。虹吸出水对渗透系数和孔隙率有一定的改善作用,但不能有效抑制堵塞的发生。系统运行期间 EPS 含量变化不大,存在生物堵塞的风险。
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来源期刊
Water Environment Research
Water Environment Research 环境科学-工程:环境
CiteScore
6.30
自引率
0.00%
发文量
138
审稿时长
11 months
期刊介绍: Published since 1928, Water Environment Research (WER) is an international multidisciplinary water resource management journal for the dissemination of fundamental and applied research in all scientific and technical areas related to water quality and resource recovery. WER''s goal is to foster communication and interdisciplinary research between water sciences and related fields such as environmental toxicology, agriculture, public and occupational health, microbiology, and ecology. In addition to original research articles, short communications, case studies, reviews, and perspectives are encouraged.
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