Effects of Hydraulic Retention Time (HRT)
and Packing Height on the Performance
of Homemade Ceramsite-Soil Constructed Wetland
for Rural Domestic Wastewater Treatment

Zhang, Xinyan; Luo, Xuan; Han, Qingji; Ju, Kai; Wei, Dongyang; Yong-qing, Sun; Wan, Qiong

doi:10.15244/pjoes/133237

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…(1) atmospheric reaeration and plants' oxygen transition in upper area of wetland system enhanced oxygen level [16]; (2) upper nitrification area was operated by tidal flow mode which promoted oxygen penetrating into wetland and improved overall oxygen environment. When SER was 2:1, the DO range in CW1-A (2.65-2.70 mg.L -1 ) was inferior to CW0-A (3.59-3.78 mg.L -1 ) and CW2-A (3.33-3.37 mg.L -1 ).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Nitrogen Removal Performance in Constructed Wetland by Coupling Partial Tide Flow Operation Mode with Iron-Carbon Micro-Electrolysis Process

Ding¹,

Ji²,

Sun³

et al. 2022

Pol. J. Environ. Stud.

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Constructed wetlands (CWs) with iron-carbon (Fe-C) filler and gravel filler were set up to examine the synthetic effects of partial tide flow operation mode and Fe-C micro-electrolysis on nitrogen removal performance. Submerged emptying ratio (SER) that representing flood and drain period was set to 2:1 and 1:2 respectively for creating aerobic/anoxic alternative conditions. Upper nitrification area of CWs was operated by tide flow mode and the transformation of NH 4 + -N to NO 3 --N was greatly enhanced via the extension of emptying time for air dissolution. Fe-C micro-electrolysis could enhance the availability of carbon sources for biological denitrification and facilitated autotrophic denitrification based on iron oxidation and transfer. It made clear that enhanced denitrification in bottom area contributed to NO 3 --N removal from water body thus facilitating TN removal. Comprehensive and stable COD (84.2±2.0%), NO 3 --N (82.1±2.0%) and TN (55.6±2.0%) removal efficiencies were simultaneously achieved in partial tide flow CW with Fe-C filler under SER of 1:2. The study provided a novel idea for the efficient nitrogen removal in CWs treating eutrophic water.

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Section: Resultsmentioning

confidence: 99%

Enhanced Nitrogen Removal Performance in Constructed Wetland by Coupling Partial Tide Flow Operation Mode with Iron-Carbon Micro-Electrolysis Process

Ding¹,

Ji²,

Sun³

et al. 2022

Pol. J. Environ. Stud.

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Microbiological dimensions and functions in constructed wetlands: A review

Rani,

Chauhan,

Kumar Sharma

et al. 2024

Current Research in Microbial Sciences

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Predicting the Release and Migration of Potentially Harmful Elements (PHEs) during the Lightweight Ceramsite Preparation from Carbide Slag

Jiang

et al. 2023

Minerals

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When preparing lightweight ceramsite using carbide slag, trace amounts of toxic elements are released into the atmosphere due to high-temperature calcination, posing a significant risk to the environment. The real-time monitoring of the released gases is challenging under laboratory conditions while preparing large quantities of ceramsite. Therefore, heating was simulated using experimental data and the FactSage 7.0 thermochemical database to study the release of harmful Al-, C-, H-, S-, and F-containing elements when using carbide slag to prepare lightweight ceramsite. The results indicated that no Al, C, H, S, or F elements were evident in the high-temperature liquid products obtained in a 50 °C to 1150 °C calcination temperature range. Al was present in a solid state with no gaseous products. When the temperature reached 450 °C, CO gas was released and its level increased as the temperature rose. H and S mainly combined into H2S gas, starting at 250 °C and reaching a peak at 1050 °C. H and F primarily combined into HF, starting at 400 °C. Other F-containing gases mainly included SiF4 and TiF3, which began to release at 800 °C and 900 °C, respectively. The release trends of HF, SiF4, and TiF3 were consistent with those of CO. This study aimed to conduct an environmental impact and management assessment for the preparation of lightweight ceramsite using carbide slag. The use of raw material carbide slag for the low-cost treatment of tail gas was proposed, which provides theoretical and up-to-date support for greening the application of the process.

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Effects of Hydraulic Retention Time (HRT) and Packing Height on the Performance of Homemade Ceramsite-Soil Constructed Wetland for Rural Domestic Wastewater Treatment

Cited by 3 publications

References 27 publications

Enhanced Nitrogen Removal Performance in Constructed Wetland by Coupling Partial Tide Flow Operation Mode with Iron-Carbon Micro-Electrolysis Process

Enhanced Nitrogen Removal Performance in Constructed Wetland by Coupling Partial Tide Flow Operation Mode with Iron-Carbon Micro-Electrolysis Process

Microbiological dimensions and functions in constructed wetlands: A review

Predicting the Release and Migration of Potentially Harmful Elements (PHEs) during the Lightweight Ceramsite Preparation from Carbide Slag

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