An innovative biochar-amended substrate vertical flow constructed wetland for low C/N wastewater treatment: Impact of influent strengths

Zhou, Xu; Liang, Chenglong; Jia, Lixia; Feng, Lu; Wang, Ruigang; Wu, Haiming

doi:10.1016/j.biortech.2017.09.044

Cited by 121 publications

(25 citation statements)

References 29 publications

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“…In a previous study, we found an average COD reduction of 73% for biochar columns when treating pre-settled raw wastewater with an anaerobic biofilter, which was significantly better than sand columns (58%) [25]. In experiments with vertical constructed wetlands treating synthetic wastewater, biochar-amended wetlands removed significantly more COD (up to 85%) than without biochar (up to 68%) [26]. Due to its porous structure and high specific surface area [27,28], biochar might also act as a low-cost sorbent potentially removing emergent contaminants [29,30].…”

Section: Introductionmentioning

confidence: 90%

Efficient Low-Cost Anaerobic Treatment of Wastewater Using Biochar and Woodchip Filters

Kaetzl

Lübken

Gehring

et al. 2018

Water

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Access to improved sanitation is often lacking in many low-income countries, and approximately 90% of the sewage is discharged without treatment into receiving water bodies. The aim of this study was the development and evaluation of an efficient low-cost wastewater treatment system for developing countries. Biochar and woodchips, potential locally available and inexpensive materials, were used for anaerobic wastewater filtration and their suitability evaluated in comparison to gravel as a common reference material. Filters were fed with raw sewage from a municipal full-scale wastewater treatment plant in Germany at 22 • C room temperature with a hydraulic loading rate (HLR) of 0.05 m•h −1. This resulted in a mean organic loading rate (OLR) of 252 g COD •m −3 •d −1 and a mean organic surface load of 456 g COD •m −2 •d −1. To determine the influence of different filter materials, the removal efficiency of chemical oxygen demand (COD), total organic carbon (TOC), turbidity, and faecal indicator bacteria (FIB) E. coli and enterococci were tested. It was found that COD (up to 90%), TOC (up to 80%), FIB (up to 1.7 log 10-units), and turbidity (effluent turbidity below 35 NTU) could be significantly reduced. The findings of this study demonstrate the potential of anaerobic filters (AFs) for wastewater treatment in low-income countries to reduce water pollution and comprehensively improve water quality. The performance of biochar filters was significantly better over the entire experiment compared to woodchip and gravel filters with respect to COD, TOC, turbidity, and FIB removal, indicating the superior properties of biochar for wastewater treatment.

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Section: Introductionmentioning

confidence: 90%

Efficient Low-Cost Anaerobic Treatment of Wastewater Using Biochar and Woodchip Filters

Kaetzl

Lübken

Gehring

et al. 2018

Water

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“…For example, ammonia-oxidizing bacteria prefer aerobic environments, while denitrifying bacteria are favored under anaerobic conditions [25]. A large number of studies show that appropriate management approaches (e.g., the addition of external carbon sources and intermittent aeration) can enhance contaminant removal efficiency by promoting microbial growth and reproduction, and by increasing the microbial community diversity and richness of CWs [12,46].…”

Section: Microorganisms Dominate Contaminant Removalmentioning

confidence: 99%

“…Constructed wetlands (CWs) are artificial ecosystems that simulate biogeochemical processes occurring in natural wetlands to optimize their water purification function. Due to their characteristics of being low-cost, having a low energy consumption, and being relatively easily managed [12], CWs are considered important forms of green infrastructure that are widely used for wastewater treatment, especially for the treatment of agricultural runoff, domestic wastewater, and industrial landfill leachate [13,14]. Although accurate data are not available, it is estimated that CWs have increased 5-50% globally since the 1960s [15].…”

Section: Introductionmentioning

confidence: 99%

Can Constructed Wetlands be Wildlife Refuges? A Review of Their Potential Biodiversity Conservation Value

et al. 2020

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The degradation of wetland ecosystems is currently recognized as one of the main threats to global biodiversity. As a means of compensation, constructed wetlands (CWs), which are built to treat agricultural runoff and municipal wastewater, have become important for maintaining biodiversity. Here, we review studies on the relationships between CWs and their associated biodiversity published over the past three decades. In doing so, we provide an overview of how wildlife utilizes CWs, and the effects of biodiversity on pollutant transformation and removal. Beyond their primary aim (to purify various kinds of wastewater), CWs provide sub-optimal habitat for many species and, in turn, their purification function can be strongly influenced by the biodiversity that they support. However, there are some difficulties when using CWs to conserve biodiversity because some key characteristics of these engineered ecosystems vary from natural wetlands, including some fundamental ecological processes. Without proper management intervention, these features of CWs can promote biological invasion, as well as form an ‘ecological trap’ for native species. Management options, such as basin-wide integrative management and building in more natural wetland components, can partially offset these adverse impacts. Overall, the awareness of managers and the public regarding the potential value of CWs in biodiversity conservation remains superficial. More in-depth research, especially on how to balance different stakeholder values between wastewater managers and conservationists, is now required.

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“…Researchers have attempted to explore particular substrates to intensify the functions of CWs with high contaminants concentration, among which biochar has been favorably considered (Gupta et al, 2015). Zhou et al (2018) used biochar as a substrate in vertical flow constructed wetlands (VFCWs) to enhance the removal efficiency with a series of low C/N ratio influent strengths. They assessed the removal of N and organic contaminants in both VFCWs with/without biochar added.…”

Section: Indirect Water and Wastewater Treatmentmentioning

confidence: 99%

Peer Review #1 of "Recent advances in biochar application for water and wastewater treatment: a review (v0.2)"

2020

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In the past decade, researchers have carried out a massive amount of research on the application of biochar for contaminants removal from aqueous solutions. As an emerging sorbent with great potential, biochar has shown significant advantages such as the broad sources of feedstocks, easy preparation process, and favorable surface and structural properties. This review provides an overview of recent advances in biochar application in water and wastewater treatment, including a brief discussion of the involved sorption mechanisms of contaminants removal, as well as the biochar modification methods. Furthermore, environmental concerns of biochar that need to be paid attention to and future research directions are put forward to promote the further application of biochar in practical water and wastewater treatment.

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An innovative biochar-amended substrate vertical flow constructed wetland for low C/N wastewater treatment: Impact of influent strengths

Cited by 121 publications

References 29 publications

Efficient Low-Cost Anaerobic Treatment of Wastewater Using Biochar and Woodchip Filters

Efficient Low-Cost Anaerobic Treatment of Wastewater Using Biochar and Woodchip Filters

Can Constructed Wetlands be Wildlife Refuges? A Review of Their Potential Biodiversity Conservation Value

Peer Review #1 of "Recent advances in biochar application for water and wastewater treatment: a review (v0.2)"

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