Tertiary Denitrification of the Secondary Effluent by Denitrifying Biofilters Packed with Different Sizes of  Quartz Sand

Wei, Nan; Shi, Yunhong; Wu, Guangxue; Hu, Hong-Ying; Wu, Yue; Wen, Hui

doi:10.3390/w6051300

Cited by 26 publications

(6 citation statements)

References 28 publications

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“…Researchers and engineers working on DNFs have primarily focused on whether treated wastewater meets the total nitrogen discharge requirements and how to optimize the operation of DNFs to decrease the dissolved inorganic nitrogen. 23,52,53 Concern is rarely paid to the removal of DON during the DNF process and its impact on the receiving water systems. Optimizing external carbon addition not only improves the NDF process efficiency but also saves chemical costs and reduces secondary pollution (e.g., COD).…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Removal Characteristics of Dissolved Organic Nitrogen and Its Bioavailable Portion in a Postdenitrifying Biofilter: Effect of the C/N Ratio

Liao

Geng

et al. 2018

Environ. Sci. Technol.

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Addition of external carbon sources to postdenitrification biofilters (DNFs) is frequently used in municipal wastewater treatment plants to enhance dissolved inorganic nitrogen removal. However, little is known about its influence on the removal of dissolved organic nitrogen (DON). This study investigated the effect of the carbon-to-nitrogen (C/N) ratio (3, 4, 5, and 6) on the removal characteristics of DON and bioavailable DON (ABDON) in the pilot-scale DNFs treating real secondary effluent. Results showed that DNFs effluent DON accounted for 31.2-39.8% of the effluent total nitrogen. The maximum effluent DON and ABDON concentrations both occurred in DNF operated at a C/N ratio of 3. There was no significant difference in effluent DON concentrations in DNFs at C/N ratios of 4, 5, and 6; however, effluent ABDON and DON bioavailability significantly decreased with C/N ratios (p < 0.05, t-test). According to the chemical composition analysis, effluent DON at high C/N ratios tends to contain less % molecular weight < 1 kDa nitrogenous organic compounds and proteins/amino sugars-like nitrogenous organic formulas, which is likely responsible for its low bioavailability. Overall, this study indicates the benefit of a high C/N ratio during the DNF process in terms of controlling the DON forms that readily stimulate algal growth.

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Section: Environmental Science and Technologymentioning

confidence: 99%

Removal Characteristics of Dissolved Organic Nitrogen and Its Bioavailable Portion in a Postdenitrifying Biofilter: Effect of the C/N Ratio

Liao

Geng

et al. 2018

Environ. Sci. Technol.

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“…The performance of both DNBFs was stable within each backwashing cycle, with the NO3 − -N removal percentage variation within 5%. Better denitrification was achieved in DNBFS but with a decreased flow rate during the operation [19].…”

Section: The Main Contribution Of This Special Issuementioning

confidence: 92%

“…In biofilter systems, the size of the filter media affects the system performance with smaller diameter media achieving better the nutrient removal efficiency [18]. Two denitrifying biofilters (DNBF), one packed with quart sand with sizes of 2-4 mm (DNBFS) and the other of 4-6 mm (DNBFL), were studied for tertiary denitrification under empty bed retention times (EBRTs) of 30 min, 15 min, and 7.5 min [19]. Using these times of operation, the percentages of NO3 − -N removal were 93%, 82% and 83% in DNBFS biofilter, and 92%, 68% and 36% in DNBFL one, respectively.…”

Section: The Main Contribution Of This Special Issuementioning

confidence: 99%

Wastewater Treatment and Reuse: Past, Present, and Future

Angelakιs

Snyder

2015

Water

156

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Abstract:This paper provides an overview of the Special Issue on Wastewater Treatment and Reuse: Past, Present, and Future. The papers selected for publication include advanced wastewater treatment and monitoring technologies, such as membrane bioreactors, electrochemical systems; denitrifying biofilters, and disinfection technologies. The Issue also contains articles related to best management practices of biosolids, the influence of organic matter on pathogen inactivation and nutrient removal. Collectively, the Special Issue presents an evolution of technologies, from conventional through advanced, for reliable and sustainable wastewater treatment and reuse.Keywords: bioelectrochemical systems; bioenergy; carbon cycling; denitrifying biofilters; disinfection; horizontal and/or vertical flow constructed wetlands; land application systems; management of biosolids and manure; membrane bioreactors; multicriteria decision making; olive mill wastewater treatment; specific energy consumption ProlegomenaWastewater treatment and reuse is not new, and knowledge on this topic has evolved and advanced throughout human history. Reuse of untreated municipal wastewater has been practiced for many OPEN ACCESS

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“…As secondary effluent has low turbidity and is oligotrophic, biofiltration processes are often selected as the first option for advanced treatment. Currently, ceramsite grains, granular activated carbon, and quartz sand (Jing et al 2012;Ismail and Toshihiko 2012;Wei et al 2014) are widely used as packing materials for biofilters in conventional denitrification processes. Typically, secondary effluent from WWTPs is severely limited in organic carbon, and thus, an external soluble carbon source (e.g., acetic acid, sodium acetate, glucose, ethanol, and methanol) is often added to achieve denitrification (Strong et al 2011;Chu and Wang 2011).…”

Section: Introductionmentioning

confidence: 99%

Optimization of nitrate removal from wastewater with a low C/N ratio using solid-phase denitrification

Zhang

2015

Environ Sci Pollut Res

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In this study, the optimization of nitrate removal from wastewater with a low C/N ratio using solid-phase denitrification was investigated. Biodegradable polymer, an attractive alternative to liquid carbon sources for biological denitrification, was used as a carbon source and biofilm support for nitrate removal. An experiment was conducted based on a central composite design (CCD) with response surface methodology (RSM). A secondary polynomial regression with nitrate removal efficiency as response value was developed. Based on statistical analysis, the nitrate removal model was highly significant with very low probability values (<0.0001). At the optimal conditions for nitrate removal (hydraulic retention time (HRT), 3.5 h; influent NO3 (-)-N concentration, 14.73 mg/L; and influent CODCr concentration, 15.00 mg/L), the nitrate removal efficiency was 99.23 %. The results of an ANOVA and response surface analysis showed that HRT, influent NO3 (-)-N concentration, influent CODCr concentration, and the interaction between the HRT and influent CODCr concentration significantly affected the nitrate removal efficiency (P < 0.05). In solid-phase denitrification process, electron donor for denitrification could be obtained by biological degradation of biodegradable polymer. Therefore, the influent CODCr concentration has no major effect on nitrate removal efficiency compared with that of HRT and influent NO3 (-)-N concentration.

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Tertiary Denitrification of the Secondary Effluent by Denitrifying Biofilters Packed with Different Sizes of Quartz Sand

Cited by 26 publications

References 28 publications

Removal Characteristics of Dissolved Organic Nitrogen and Its Bioavailable Portion in a Postdenitrifying Biofilter: Effect of the C/N Ratio

Removal Characteristics of Dissolved Organic Nitrogen and Its Bioavailable Portion in a Postdenitrifying Biofilter: Effect of the C/N Ratio

Wastewater Treatment and Reuse: Past, Present, and Future

Optimization of nitrate removal from wastewater with a low C/N ratio using solid-phase denitrification

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