Organic matter transplant improved purification performance of newly built constructed wetlands

Fu, Guiping; Guo, Zhipeng; Zhang, Jiahong; Chen, Zhuangrui; Wong, Ming Hung

doi:10.1016/j.ecoleng.2015.07.007

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…On the other hand; the retention of most of feed organic matter within the sludge layer may limit the efficiency of subsequent denitrification (Lee et al, 2009;Van Oostrom & Russell, 1994). The effective roles of the sludge layer in the system may depend on its structural, compositional and reactional properties which are controlled by numerous factors, such as the composition of the influent wastewater, the operating conditions of the plant, or other local environmental factors (Fu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Comparative characterization of surface sludge deposits from fourteen French Vertical Flow Constructed Wetlands sewage treatment plants using biological, chemical and thermal indices

Kania

Gautier

Imig

et al. 2019

Science of The Total Environment

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Due to their design and mode of operation, French Vertical Flow Constructed Wetlands (VFCWs) accumulate suspended solids from the inflow wastewater in the form of a sludge layer at the surface of the first filter. In order to maintain the treatment performance over the long term, the characteristics of the sludge deposits and their evolution have to be well described. In this objective, a panel of sludge deposit samples taken from 14 French VFCW sewage treatment plants was investigated. Elemental composition and organic matter content, nature and reactivity were analyzed. Results clearly revealed two categories of sludge deposits, namely the "young-age plants" type (1 year of operation and less) and the "mature plants" type (3 years of operation and more). Sludge deposits from the "mature plants" exhibited same biological, physical and chemical properties. Their organic matter was globally less abundant, more humified and less biodegradable than in the young-age plants type. Their overall contents in trace metals were also higher, although in a limited manner. The effect of additional treatments, particularly FeCl injection for phosphorus precipitation, was observable in the "young-age plants" group. Finally, the sludge deposits sampled from one particular plant with specific operating conditions were found to exhibit very different characteristics from those of either groups identified. This observation underlined the influence of local conditions on the typology of the sludge deposits.

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Section: Introductionmentioning

confidence: 99%

Comparative characterization of surface sludge deposits from fourteen French Vertical Flow Constructed Wetlands sewage treatment plants using biological, chemical and thermal indices

Kania

Gautier

Imig

et al. 2019

Science of The Total Environment

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“…Recent studies have revealed the positive roles of this layer in suspended solids retention and dissolved pollutants sorption and/or degradation (Kim et al, 2013;Kim et al, 2014;Molle, 2014). Fu et al (2015) (Fu et al, 2015) showed that spreading sludge deposits taken from a mature plant at the surface of the first-stage filters of a newly installed plant improved greatly the startup performance of the new plant. However in practice, excessive accumulation of sludge deposits is considered to reduce permeability and thereby alter the performance of the system.…”

Section: Introductionmentioning

confidence: 99%

Analytical indicators to characterize Particulate Organic Matter (POM) and its evolution in French Vertical Flow Constructed Wetlands (VFCWs)

Kania

Gautier

et al. 2018

Science of The Total Environment

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The design of French VFCWs leads to the formation of a sludge layer at the surface of the first filters due to the retention of suspended solids from the percolation of unsettled wastewater. This layer plays a major role in the system but still little is known on its characteristics and evolutions. In this study, suspended solids and sludge deposits sampled from two French VFCW plants were analyzed by different methods in the objective to assess the evolution of particulate organic matter (POM) along the treatment chain and within the sludge layer, and identify relevant analytical indicators of these phenomena. The treatment chain included an aerobic trickling filter followed by FeCl injection and two successive stages of filters. Thermal analyses showed that OM contents of suspended solids decreased along the treatment chain. POM in inflow suspended solids was predominantly composed of reactive, biodegradable compounds which were partly hydrolyzed and mineralized notably at the trickling filter stage. 3D fluorescence spectra collected from aqueous POM extracts confirmed the evolution of organic matter from low-molecular reactive compounds to more complex and stable structures such as humic-like substances. FTIR confirmed the mineralization of POM's reactive constituents along the treatment chain by the decrease in the intensities of the characteristics bands of aliphatic compounds or proteins, and its humification in the sludge deposits through the relative increase of the bands at 1634cm (v) and 1238cm (δ and/or δ). Isotopic ratios δH/H and δN/N were found to be good indicators of POM evolutions. The higher values of δH/H and δN/N ratios measured in sludge deposits as compared to inflow suspended solids were related to POM humification and to microbial processes of POM hydrolysis and mineralization, respectively.

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Effect of plant-based carbon sources on denitrifying microorganisms in a vertical flow constructed wetland

Huangshen

Guo

et al. 2017

Bioresource Technology

106

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Organic matter transplant improved purification performance of newly built constructed wetlands

Cited by 4 publications

References 20 publications

Comparative characterization of surface sludge deposits from fourteen French Vertical Flow Constructed Wetlands sewage treatment plants using biological, chemical and thermal indices

Comparative characterization of surface sludge deposits from fourteen French Vertical Flow Constructed Wetlands sewage treatment plants using biological, chemical and thermal indices

Analytical indicators to characterize Particulate Organic Matter (POM) and its evolution in French Vertical Flow Constructed Wetlands (VFCWs)

Effect of plant-based carbon sources on denitrifying microorganisms in a vertical flow constructed wetland

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