Organics and nutrient removal from swine wastewater by constructed wetlands using ceramsite and magnetite as substrates

Dong, Lu; Zhi-ping, QI; Li, Mengqi; Zhang, Yan; Chen, Yingrun; Qi, Yuanfeng; Wu, Haiming

doi:10.1016/j.jece.2020.104739

Cited by 38 publications

(9 citation statements)

References 51 publications

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“…Before the continuous operation, the best operational residence time must be determined to understand the required duration for the efficient reaction to occur in terms of COD removal. Due to this and considering the discontinuous Fenton operation and apparatus [35], several reaction times were evaluated (10,15,30,45,60, and 90 min). The results are present in Figure 2.…”

Section: Evaluation Of Residence Timementioning

confidence: 99%

“…The swine wastewater (SW) is complex, being characterized by high organic loads due to the existence of fatty acids, nitrogen, phosphorous, heavy metals, antibiotics, suspended solids, and fecal coliforms [1,4,6,9]. Therefore, this kind of wastewater can be dangerous due to the existence high loads of organic matter (OM), ammonium and ammonia, antibiotics, and pathogenic organisms [4,5,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Continuous Heterogeneous Fenton for Swine Wastewater Treatment: Converting an Industry Waste into a Wastewater Treatment Material

Lincho,

Gomes,

Martins

et al. 2024

Water

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Swine wastewater (SW) was treated using industrial wastes as raw materials in a pre-treatment process (coagulation or adsorption), followed by a continuous heterogeneous Fenton reaction. Before the treatment conducted as a continuous operation, two different batch optimization strategies were evaluated, in which the effects of H2O2 concentration and pH were studied. The results show that using excessive H2O2 results in the same behavior, regardless of whether the pH is 3 or 7.5, while at low H2O2 concentrations, the acidic pH improves the chemical oxygen demand (COD) removal due to a higher solubility of iron. The partial addition of H2O2 after 60 min of the reaction proved to be unbeneficial. Considering other perspectives, a continuous Fenton process using iron filings (IF) as the iron source ([H2O2] = 50 mg/L) was applied after the SW pre-treatment, consisting of adsorption with red mud (RM) or coagulation with poly-diallyldimethylammonium chloride (PDADMAC). The RM adsorption presented higher COD removal and lower toxicity than the PDADMAC coagulation, revealing to be a suitable material for this purpose, but for both pre-treatments, the application of a subsequent continuous Fenton process revealed to be essential to achieve the COD discharge limits imposed by the Portuguese law. In addition, high amounts of dissolved iron were present in the samples (55–58 mg/L) after the Fenton process. However, after the overall treatment, the samples showed no harmful characteristics for Lepidium sativum, being classified as “non-toxic”, contrary to the initial wastewater.

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Section: Evaluation Of Residence Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuous Heterogeneous Fenton for Swine Wastewater Treatment: Converting an Industry Waste into a Wastewater Treatment Material

Lincho,

Gomes,

Martins

et al. 2024

Water

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show abstract

“…The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/ijerph20053876/s1, Figure S1: The flow diagram of the literature search and selection process, Table S1: CH4 and N2O emission from different substrateamended CWs, Table S2: NH3 volatilization from CWs and ponds is affected by several factors. References [11,12,[35][36][37][38][39]63,[99][100][101]105,118,119] are cited in the supplementary materials.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Factors Influencing Gaseous Emissions in Constructed Wetlands: A Meta-Analysis and Systematic Review

Zhu

Bañuelos

et al. 2023

IJERPH

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Constructed wetlands (CWs) are an eco-technology for wastewater treatment and are applied worldwide. Due to the regular influx of pollutants, CWs can release considerable quantities of greenhouse gases (GHGs), ammonia (NH3), and other atmospheric pollutants, such as volatile organic compounds (VOCs) and hydrogen sulfide (H2S), etc., which will aggravate global warming, degrade air quality and even threaten human health. However, there is a lack of systematic understanding of factors affecting the emission of these gases in CWs. In this study, we applied meta-analysis to quantitatively review the main influencing factors of GHG emission from CWs; meanwhile, the emissions of NH3, VOCs, and H2S were qualitatively assessed. Meta-analysis indicates that horizontal subsurface flow (HSSF) CWs emit less CH4 and N2O than free water surface flow (FWS) CWs. The addition of biochar can mitigate N2O emission compared to gravel-based CWs but has the risk of increasing CH4 emission. Polyculture CWs stimulate CH4 emission but pose no influence on N2O emission compared to monoculture CWs. The influent wastewater characteristics (e.g., C/N ratio, salinity) and environmental conditions (e.g., temperature) can also impact GHG emission. The NH3 volatilization from CWs is positively related to the influent nitrogen concentration and pH value. High plant species richness tends to reduce NH3 volatilization and plant composition showed greater effects than species richness. Though VOCs and H2S emissions from CWs do not always occur, it should be a concern when using CWs to treat wastewater containing hydrocarbon and acid. This study provides solid references for simultaneously achieving pollutant removal and reducing gaseous emission from CWs, which avoids the transformation of water pollution into air contamination.

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“…Concerning the procedure that was fol-lowed for the monitoring of N2O emissions, the closed chamber technique was mainly applied (86% of studies) for the collection of gas samples, while the N2O analysis was conducted in most of the cases using gas chromatography with an electron capture detector (GC-ECD). The average temperature varied from 14. wastewater [13,[20][21][22][23][24][25], swine wastewater [14,[26][27][28][29], agricultural runoff water [30][31],…”

Section: Profile Of the Research Papers Containing Information For N2o Emissions In Cwsmentioning

confidence: 99%

Estimation of N2O emissions from wastewater characteristics in constructed wetlands

Koutsou

Fountoulakis

Matsoukas

et al. 2021

Journal of Environmental Chemical Engineering

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Organics and nutrient removal from swine wastewater by constructed wetlands using ceramsite and magnetite as substrates

Cited by 38 publications

References 51 publications

Continuous Heterogeneous Fenton for Swine Wastewater Treatment: Converting an Industry Waste into a Wastewater Treatment Material

Continuous Heterogeneous Fenton for Swine Wastewater Treatment: Converting an Industry Waste into a Wastewater Treatment Material

Factors Influencing Gaseous Emissions in Constructed Wetlands: A Meta-Analysis and Systematic Review

Estimation of N2O emissions from wastewater characteristics in constructed wetlands

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