Treatment performance of integrated vertical-flow constructed wetland plots for domestic wastewater

Desalination and Water Treatment

Zhang

et al. 2015

Self Cite

A B S T R A C TFour small-scale gravel-based integrated vertical-flow constructed wetlands (IVCWs) were established to treat domestic and secondary wastewater (SW) in parallel under two loading rates (LRs) for an operational period of about two years and the total phosphorus (TP) removal performances were investigated and compared. Highly effective TP elimination sustained for about 10 d, with remarkable declines followed to relatively stable efficiencies for both types of wastewater. Significant difference of TP removal performance for the two types of wastewater was observed. In period 1, under high LR, the IVCWs performed better when treating domestic wastewater (DW), achieving average removal efficiency and rate of 51.6% and 0.389 g m, respectively, compared to those of 30.1% and 0.233 g mfor SW. However, in the operational period 2 fed with a low LR, better TP removal performance was achieved for SW, with reduction efficiency and rate of 41.5% and 0.057 g m −2 d −1 on average, while the corresponding value for the treatment of DW was just 12.5% and 0.023 g m. Significant correlations between TP removal efficiency and plant growth detected during this period and better developed vegetation in systems fed with SW might suggest the considerable role of plant growth, which could be influenced by inlet properties, on P retention and lifespan extending of constructed wetland. Gravel-based IVCW could be employed to remove low load of phosphorus and wastewater properties, and plant growth cycle should be taken into consideration in future IVCW design and application.

Section: Integrated Vertical-flow Constructed Wetlandsmentioning

confidence: 99%

Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Desalination and Water Treatment

Zhang

et al. 2015

Self Cite

“…The removal efficiency of TN in this study was similar to the result of Wang et al (2011) and Wu et al (2011), but lower than Akratos and Tsihrintzis (2007), Kotti et al (2010) and Gikas and Tsihrintzis (2012) for the similar size. The removal rates for NH 4 + -N was similar to Chang et al (2012), while lower than Kotti et al (2010), Wu et al (2011) and Xiong et al (2011). This may be attributed to different HRT (Huang et al 2000;Akratos and Tsihrintzis 2007;Kotti et al 2010;Stefanakis and Tsihrintzis 2012).…”

Section: Evaluation Of Treatment Performance For Pollutantsmentioning

confidence: 63%

Treatment performance and microorganism community structure of integrated vertical-flow constructed wetland plots for domestic wastewater

Dai

et al. 2012

Environ Sci Pollut Res

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In order to investigate the treatment performance and microorganism mechanism of IVCW for domestic wastewater in central of China, two parallel pilot-scale IVCW systems were built to evaluate purification efficiencies, microbial community structure and enzyme activities. The results showed that mean removal efficiencies were 81.03 % for COD, 51.66 % for total nitrogen (TN), 42.50 % for NH 4 + -N, and 68.01 % for TP. Significant positive correlations between nitrate reductase activities and TN and NH 4 + -N removal efficiencies, along with a significant correlation between substrate enzyme activity and operation time, were observed. Redundancy analysis demonstrated gram-negative bacteria were mainly responsible for urease and phosphatase activities, and also played a major role in dehydrogenase and nitrate reductase activities. Meanwhile, anaerobic bacteria, gram-negative bacteria, and saturated FA groups, gram-positive bacteria exhibited good correlations with the removal of COD (p00.388), N (p0 0.236), and TP (p00.074), respectively. The IVCW system can be used to treat domestic wastewater effectively.

“…Integrated vertical-flow constructed wetlands (IVCWs) have been successfully applied to treat domestic and secondary wastewater [16][17][18][19]. It is expected that the microbial parameters mentioned above can be markedly affected by wastewater type due to different constituents.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Responses of microbial abundance and enzyme activity in integrated vertical-flow constructed wetlands for domestic and secondary wastewater

Desalination and Water Treatment

Liang

et al. 2015

Self Cite

A B S T R A C TAlthough micro-organisms play a significant role in pollutant removal in constructed wetlands, little is known on the effect of wastewater-quality properties on microbial characteristics. In this study, two groups of integrated vertical-flow constructed wetland microcosms were applied to treat synthetic domestic wastewater and synthetic secondary effluent. The effects of wastewater-quality properties on microbial features were assessed. Results showed that higher values of microbial indicators were observed in the systems with domestic wastewater and in down-flow cells. Redundancy analysis revealed that organic matter concentration and temperature were two critical determinants influencing the microbial features.