Effect of hydraulic loading rate on pollutant removal efficiency in subsurface infiltration system under intermittent operation and micro-power aeration

Yang, Yongqiang; Zhan, Xuan; Wu, Shijun; Kang, Mingliang; Guo, Jianming; Chen, Fanrong

doi:10.1016/j.biortech.2015.12.088

Cited by 51 publications

(28 citation statements)

References 35 publications

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“…In this study, COD removal efficiency was consistent with the change in bacterial , the number of nitrifying bacteria decreased 10-fold. These observations confirmed that HLR could affect the number of nitrifying bacteria in the following ways: Firstly, increasing hydraulic loading meant shortening hydraulic retention time, which led to a decrease in matrix oxidation-reduction potential, limiting the growth and reproduction of nitrifying bacteria (Li et al, 2011a;Yang et al, 2016). Secondly, high HLR accelerated matrix surface biological membrane replacement, which was not conducive to the growth and reproduction of nitrifying bacteria because of the long generation period of nitrifying bacteria.…”

Section: Pollutant Removal and Main Microbial Community Of Two Swis Usupporting

confidence: 64%

“…Organic pollutants in the influent are mainly oxidized in the upper matrix, given sufficient oxygen in the infiltration system, by bacteria, fungus, actinomyces and protozoans, etc. (Hsieh et al, 2007;Yang et al, 2016). In this study, COD removal efficiency was consistent with the change in bacterial , the number of nitrifying bacteria decreased 10-fold.…”

Section: Pollutant Removal and Main Microbial Community Of Two Swis Usupporting

confidence: 63%

“…TP removal efficiencies slightly decreased with increased HLR in SWIS A and SWIS B. A possible explanation might be that longer hydraulic retention time was achieved under lower HLR, which increased the exposure time and exposed new or hidden sorption/precipitation agents in the matrix (Yang et al, 2016). Effluent TP concentrations in the two SWIS were below wastewater discharge limits under HLR of 0.04, 0.07, 0.10 and 0.13 m 3 ·m −2 ·d −1 .…”

Section: Pollutant Removal and Main Microbial Community Of Two Swis Umentioning

confidence: 93%

“…These results were attributed to the fact that SWIS B had more bacteria, including nitrifying bacteria and denitrifying bacteria, than SWIS A (in Table 1). Due to the differences in the composition of the matrix, different adaptive behaviours may have been expressed resulting in the SWIS inoculated with dewatered sludge developing a biofilm more quickly than the SWIS inoculated without dewatered sludge Yang et al, 2016). A rapidly developed biofilm may be beneficial in full-scale applications by hastening start-up.…”

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

“…Organic matter and nitrogen are absorbed by the soil, and then broken down by aerobic and anaerobic microbial processes (Fan et al, 2013). Matrix adsorption would be the dominant process for removal of COD, NH 3 -N and TN at the beginning of operation, and the role of adsorption would gradually be replaced by the activity of nitrifying and denitrifying bacteria, as there was a smooth rate of increase in the quantity of microorganisms in the SWIS Yang et al, 2016). From the beginning of the experiment, effluent TP concentration in the two SWIS was below the levels prescribed by Chinese criteria for water discharge from municipal wastewater treatment plants.…”

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

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Use of dewatered sludge as microbial inoculum of a subsurface wastewater infiltration system: effect on start-up and pollutant removal

Jiang

Sun

Pan

et al. 2017

WSA

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Brown earth-based subsurface wastewater infiltration systems (SWISs) inoculated with/without dewatered sludge were constructed and operated under the same conditions to boost the application of SWIS in brown soil areas. Start-up period of SWIS with dewatered sludge was 28 days, 12 days shorter than that of SWIS without dewatered sludge. COD, NH 3 -N and TN removal efficiencies of dewatered sludge as microbial inoculum for SWIS were higher than that of SWIS without dewatered sludge under hydraulic loading rates ( , which were simultaneously lower than Chinese criteria for water discharge from municipal wastewater treatment plants. The number of bacteria, nitrifying bacteria and denitrifying bacteria in dewatered sludge as microbial inoculum for SWIS were higher than that in SWIS without dewatered sludge under the same HLR. The results will be helpful in promoting the application of dewatered sludge as microbial inoculum in brown earth-based SWISs for the purpose of shortening start-up period, effecting high levels of pollutant removal and recycling waste.

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Section: Pollutant Removal and Main Microbial Community Of Two Swis Usupporting

confidence: 64%

Section: Pollutant Removal and Main Microbial Community Of Two Swis Usupporting

confidence: 63%

Section: Pollutant Removal and Main Microbial Community Of Two Swis Umentioning

confidence: 93%

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Use of dewatered sludge as microbial inoculum of a subsurface wastewater infiltration system: effect on start-up and pollutant removal

Jiang

Sun

Pan

et al. 2017

WSA

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Effects of infiltrator structure and hydraulic loading rates on pollutant removal efficiency and microbial community in a modified two‐stage constructed rapid infiltration systems treating swine wastewater

Chen

Huang

Chen

et al. 2019

Env Prog and Sustain Energy

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The treatments of swine wastewater with variable hydraulic loading rates (HLRs) and infiltrator structure were investigated using a modified two‐stage constructed rapid infiltration system (CRIS). Furthermore, microbial community distribution at different HLRs in the CRIS was also analyzed by high‐throughput sequencing. Results indicated that when the HLR was 5.44 cm/day and 10.88 cm/day, the removal rate of chemical oxygen demand (COD) was between 68% and 73%. However, the removal rate of COD dropped to 22.3% when the HLR increased to 16.33 cm/day. Compared to the small CRIS, the removal rate of NH3‐N was stable at about 78% in the large CRIS that had ventilation in the middle of the column. In addition, at HLR 11 cm/day, majority of the taxa detected in the CRIS were assigned to Proteobacteria, Firmicutes, and Bacteroidetes. Anaerobic ammonium oxidation occurred in the middle and lower parts of the columns of CRIS. When the HLR increased to 22 cm/day, the abundance of Planctomycetes decreased from 57.48% to 38.88% in the upper layer of the first column, whereas the abundance of Firmicutes increased from 6.8% to 16.17%. Results showed the microbial community shift was observed at different HLR, influencing the pollutants removal rate. © 2019 American Institute of Chemical Engineers Environ Prog, 38: e13218, 2019

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Effect of aeration and hydraulic loading rate on nitrogen removal by subsurface infiltration systems

Zheng

Huang

Pan

et al. 2019

Water Environment Research

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This study investigated the effect of hydraulic loading rate (HLR) on matrix dissolved oxygen (DO), organic matter removal, nitrogen removal, N2O emissions, and the abundances of functional genes participating in nitrogen removal in intermittent aerated mode (IAM) and nonaerated mode (NAM) subsurface infiltration systems (SISs). In contrast to NAM SISs, IAM SISs were able to create aerobic conditions in the upper matrix (above 50 cm depth) and anoxic or anaerobic conditions in the lower matrix (below 80 cm depth). Subsequently, this enhanced the abundance of functional genes related to nitrogen removal. Chemical oxygen demand (COD) and nitrogen removal performance were significantly higher under IAM SISs than with NAM SISs. Under a HLR of 0.3 m3/(m2 d), the IAM SIS was able to achieve low N2O emissions (12.6 mg/[m2 d]) along with removal efficiencies of 90.5%, 91.4%, and 85.7% for COD, ammonia nitrogen (NH4+‐N), and total nitrogen (TN), respectively. Practitioner points Intermittent aeration successfully realized sequential aerobic and anaerobic conditions at 50 cm depth and at 80 and 110 cm depths of a subsurface infiltration system. Intermittent aeration reduced N2O emissions and improved hydraulic loading rate and organic matter, nitrogen removal efficiencies. Intermittent aeration enhanced the abundances of amoA, nxrA, napA, narG, nirS, nirK, qnorB, and nosZ.

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Effect of hydraulic loading rate on pollutant removal efficiency in subsurface infiltration system under intermittent operation and micro-power aeration

Cited by 51 publications

References 35 publications

Use of dewatered sludge as microbial inoculum of a subsurface wastewater infiltration system: effect on start-up and pollutant removal

Use of dewatered sludge as microbial inoculum of a subsurface wastewater infiltration system: effect on start-up and pollutant removal

Effects of infiltrator structure and hydraulic loading rates on pollutant removal efficiency and microbial community in a modified two‐stage constructed rapid infiltration systems treating swine wastewater

Effect of aeration and hydraulic loading rate on nitrogen removal by subsurface infiltration systems

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