Removal and transformation of organic matters in domestic wastewater during lab-scale chemically enhanced primary treatment and a trickling filter treatment

Zhao, Qingliang; Zhong, Huiyuan; Wang, Kun; Wei, Liangliang; Liu, Jinli; Liu, Yu

doi:10.1016/s1001-0742(12)60039-4

Cited by 20 publications

(7 citation statements)

References 35 publications

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“…COR sample however exhibited a humification rate of ca 20.1±1.6% w/w of TOC which was comprised between the levels measured in the other two young plants RAM and PRE and in mature plants. This observation was attributed to the transformation of the organic matter through the trickling filter and the detachment of biofilm fragments which may favor the formation of humic-like substances as reported by other authors (Maeng et al, 2015;Zhao et al, 2013).…”

Section: Humification Ratesupporting

confidence: 65%

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: Humification Ratesupporting

confidence: 65%

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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“…Lime addition gave high removals of the turbidity percentage. At a dose of 600 mg/l, the removal percentage reached above 90% Figs (10)(11). Using FeCl3 as a coagulant (at pH~4), its dose of 40 mg/l gave a removal percentage of almost 100% which remained almost stable till the dose of 90 mg/l.…”

Section: B Effect Of Coagulant Types and Dosagementioning

confidence: 97%

“…The effects of FeCl3 dosages on the % removal are shown in Figs ( 8-9). The effects of lime dosages are given in Figs (10)(11).…”

Section: B Effect Of Coagulant Types and Dosagementioning

confidence: 99%

“…CEPT based treatment allows sedimentation basin to operate at better overflow rates, even as nonetheless retaining a high removal of TSS and BOD5 [9]. This offers a favorable advantage as the treatment infrastructure may be smaller thereby translating into a lower land requirement as well as lower capital cost while giving a fair degree treatment efficiency between 60-70% as compared to a traditional secondary treatment plant [10], [11]. Furthermore, CEPT based plant has minimal electricity/energy requirements as there's no need for aeration which otherwise is an intrinsic characteristic of "aerobic process" whereby the biomass growth is facilitated.…”

Section: Introductionmentioning

confidence: 99%

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Chemically Enhanced Primary

Fatah¹,

Bazedi²

2019

EJERS

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The Chemically enhanced process is considered to be a physicochemical technology for domestic wastewater treatment. The objective of this paper is to improve the efficiency of primary treatment processes and reducing the Hazardous Material and cost of the secondary treatment stage either by eliminating a biological treatment, where conditions and standards allow or by reducing the secondary treatment requirements. Analysis of physicochemical parameters as well as the treatment efficiency of aluminum sulfate (alum), ferric chloride (FeCl3), lime (CaO), and seawater was used. The effect of pH and the coagulant dosages were studied as well as mixing and settling time. Conditions were optimized according to the removal efficiencies measured in terms of reduction in the concentration of total suspended solids (TSS), biological oxygen demand (BOD5), and chemical oxygen demand (COD). The optimum COD removal % was achieved at a settling time of 20 minutes, while at pH~6, alum gave a high turbidity % removal of approximately 90% at the dose of 70 mg/l. FeCl3 gave a high turbidity % removal of approximately 95% at the dose of 40 mg/l. Turbidity removal and TSS removal gave a similar pattern at a settling time of 10-20 minutes, where best results were achieved. The results also showed that at pH~4, FeCl3 gave high COD% removal of approximately 90% at the dose of 40 mg/l. By studying the effect of stirrers’ speed (rpm), the results showed that an increase in the mixing intensity, above 80 rpm decreases the removals of COD, Turbidity and TSS when using alum as a coagulant.

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“…According to a report in 2010 by American Coal Ash Association, the use of CFA in construction industry was found to be 43% (American Coal Ash Association, 2010). Application of CFA has also been found in wastewater treatment such as removal of organic matter (COD & BOD) and suspended solids (Ahmaruzzaman, 2009;Andersson et al, 2012;Devi and Dahiya, 2006;Hu et al, 2017;Laohaprapanon et al, 2010; "Removal of sulfonated humic acid from aqueous phase by modified coal fly ash waste," 2016; Ugurlu et al, 2005;Yan et al, 2012;Zaharia and Suteu, 2013;Zhao et al, 2013). However, in each of these studies, CFA was treated or modified prior to wastewater treatment application.…”

Section: Application Of Coal Fly-ash In Waste Liquid Treatmentmentioning

confidence: 99%

Separation of Dissolved Organic Matter (DOM) and Per- and Polyfluoro-Alkyl Substances (PFAS) from Landfill Leachate Using Modified Coal Fly-Ash (CFA)

Patel

Greer

Xia

et al. 2022

Preprint

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Per and Poly-fluoroalkyl Substances (PFAS) has been a major subject of research in environmental sector ever since it was found in the environment and blood serums at toxic levels. As landfills are the final disposal method for majority of the waste, PFAS concentration in landfill leachate have been found in the range of few µg/L to mg/L. Only few conventional treatments such as Activated Carbon, Reverse Osmosis, and Ion-Exchange has been proven effective in removing PFAS. However, these treatment methods are proving to be very expensive and generate secondary contamination that needs to be disposed-off or treated. Since the phase out of C8-PFAS compounds, more short chain PFAS compounds are detected in landfill leachate. Hence, an effective treatment strategy is needed to keep up with the rising concentration levels and variety of PFAS compounds. The purpose of this study was to develop a sustainable and cost-effective process using modified Coal Fly-Ash (CFA) that can treat both short chain and long chain PFAS compounds. Previous studies have shown application of CFA in removal of dye and metals from different types of wastewaters. In previous studies CFA was modified to enhance its surface properties, that can improve the adsorption of organic and anionic contaminants. In this study, thermo-chemical modification was used on CFA to remove organic matter and PFAS compounds. Preliminary results showed that, CFA can remove more than 90% UV absorbance, more than 80% TOC and approximately 40% of total PFAS compounds. The maximum adsorption capacity for total PFAS was found to be 84 ng PFAS per g CFA, out of which 70 ng was for short chain PFAS and 14 ng for long chain PFAS compounds. An effective removal of organic matter and PFAS compounds, show a promising application of CFA in leachate treatment. However, further research is needed to analyze the adsorption dynamics, kinetics, post-treatment disposal method, and any possible contamination when mixing CFA with landfill leachate.

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Removal and transformation of organic matters in domestic wastewater during lab-scale chemically enhanced primary treatment and a trickling filter treatment

Cited by 20 publications

References 35 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

Chemically Enhanced Primary

Separation of Dissolved Organic Matter (DOM) and Per- and Polyfluoro-Alkyl Substances (PFAS) from Landfill Leachate Using Modified Coal Fly-Ash (CFA)

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