Effects of hydraulic retention time (HRT) on denitrification using waste activated sludge thermal hydrolysis liquid and acidogenic liquid as carbon sources

Guo, Yiding; Guo, Liang; Sun, Mei; Zhao, Yangguo; She, Zhigang

doi:10.1016/j.biortech.2016.11.056

Cited by 110 publications

(36 citation statements)

References 32 publications

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“…Biomass yield is an important parameter for describing the properties of carbon sources. In general, a higher biomass yield indicates that more carbon sources are utilized to produce biomass and less are used in the denitrification processes (Guo et al, 2017). Moreover, the disposal of excess sludge requires money and energy (Amanatidou et al, 2015).…”

Section: Settleability Dewaterability and Biomass Yield Of Activatedmentioning

confidence: 99%

Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Tang

Wang

et al. 2018

Bioresource Technology

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In this study, nitrogen removal using the lactic acid fermentation products from food waste and other external chemical carbon sources (sodium acetate, sodium lactate and starch) was investigated. Similar to sodium acetate and lactate, the lactic acid-enriched fermentation liquid from food waste (FLFW) exhibited a high denitrification rate (5.5 mg NO x-N/(g-VSS•h)) and potential (0.16 g NO 3-N/g COD), and could achieve high NH 4 +-N and total nitrogen (TN) removal efficiencies during long-term operation. Using FLFW as supplementary carbon sources reduced the extracellular polymeric substances (EPS) content, improved the settleability and achieved a satisfactory biomass yield of activated sludge. Additionally, the increased microbial metabolic activity and bacterial community diversity and the accumulation of unique bacteria in the activated sludge cultured with FLFW further promoted the organics utilization rate and nitrogen removal efficiency, indicating that the FLFW prepared from solid waste was an ideal 2 carbon source for wastewater treatment.

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Section: Settleability Dewaterability and Biomass Yield Of Activatedmentioning

confidence: 99%

Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Tang

Wang

et al. 2018

Bioresource Technology

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“…Overall, this research evidence showed that the better decline of the TN effluent concentration in the constructed wetland was obtained by increasing the HRT. This directs that hydraulic operational factors played a more significant role in the removal of nitrogen in the HSSFCW treatment system (Guo et al 2017;Shuib and Baskaran, 2015;Cheng et al 2010). However, Vymazal (2005) reported that nutrient removal is usually insignificant in CW, does not greater than 50%.…”

Section: Pollutant Removal Efficiencymentioning

confidence: 88%

“…Furthermore, the treatment efficiency of a HSSFCW system is dependent on the nature of the original wastewater supply, selection of media types, feeding mode, and aeration conditions (Stefanakis and Tsihrintzis, 2012). For instance, the higher HRT or lower pollutant loading rate brings pollutants to have a higher rate of contact time within the treatment system (Reed et al 1995); favors greater chances of TSS sedimentation, and COD degradation, including high nutrient absorption and retention (Guo et al 2017), and improves the effluent quality. According to Mora-orozco et al (2018), a comparison of different treatment wetland efficiencies with the removal of solids and organic matter at different HRTs revealed that the 10 days HRT showed the highest removal efficiency than 5 days HRT.…”

Section: Pollutant Removal Efficiencymentioning

confidence: 99%

“…Research evidence showed that shorter HRTs of 2-4 days, achieved over 90% of TSS and COD, 75% of TN and TP, respectively (Cheng et al 2010). Similarly, Abou-Elela et al (2017) evaluated the application of CWs for domestic wastewater treatment, and concluded that enhanced nutrient removal was achieved as the HRT increases, despite too long HRT would reduce the treatment efficiency (Guo et al 2017). Therefore, choosing the most suitable operating HRT for the efficient removal of pollutants is the main issue.…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of two-stage horizontal subsurface flow constructed wetland planted with Cyperus alternifolius and Typha latifolia in treating anaerobic reactor brewery effluent at different hydraulic residence times

Alayu

Leta

2020

Environ Syst Res

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Background Agro-industrial wastewaters in Ethiopia cause severe environmental pollution problems. Research evidence showed that anaerobic reactors are good options for the treatment of these wastewaters. But, their final effluent does not meet the discharge standards. Conversely, a series stage horizontal subsurface flow constructed wetland (HSSFCW) system is encouraging for the polishing of anaerobic reactor effluents. However, its treatment efficiency is dependent on hydraulic residence time (HRT). Cyperus alternifolius and Typha latifolia-based wastewater treatment showed good removal efficiencies individually. However, data on their combined treatment effectiveness is negligible. Therefore, this study assesses HRT influences on the treatment effectiveness of a two-stage HSSFCW system planted with these two macrophytes for the polishing of anaerobic reactor brewery effluent. A series connected two-stage HSSFCW unit planted with Cyperus alternifolius and Typha latifolia was built to treat Kombolcha brewery anaerobic reactor effluent. Then, the macrophytes were endorsed to grow with continuous application of diluted brewery effluent from a reservoir tank using gravity force. After dense stand formation, the experiment was initiated to determine the influence of HRTs on the removal efficiency of a complete wetland system. The system was operated sequentially by supplying fixed influent inflow rates of 2791, 1395, 930, 698, and 558 L day−1, respectively, for 1, 2, 3, 4, and 5 days HRT. Both the influent and effluent of the two-stage HSSFCW system were analyzed following common procedures for main brewery pollutants. Result Results showed that as HRT increased from 1 to 5 days, the effluent pH and temperature were decreased along with enhanced pollutant removals ranging from 47.8–87.2%, 29.2–90.1%, 32.9–77.7%, 16.8–75.4%, and 18.4–76.8% with decreased influent mass loading rates ranging from 26.4–2.1, 64.5–7.3, 11.5–0.8, 5–0.6, and 3.8–0.4 gm−2 day−1, respectively, for total suspended solids, chemical oxygen demand, total nitrogen, total phosphorous and orthophosphate. However, better and steadier pollutant removals were achieved at higher HRTs. Conclusion For better nutrient removals, the 4 and 5 days HRT can serve as a good benchmark.

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“…Nitrogen compounds are the most common pollutants in groundwater. Serious aquatic problems will occur if these compounds are discharged into the environment, including the eutrophication of rivers, the degradation of water sources, and hazards to human health (Guo et al, 2017).Therefore, nitrogen removal from wastewater is one of the most important issues that cause concern about water pollution control. Biological processes are generally used for nitrogen removal from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Thiosulfate-Based Autotrophic and Mixotrophic Denitrification Performances under Different Operational Conditions

Akgül¹,

Akman²,

Cucı³

et al. 2017

Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi

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The aim of this study was to investigate the factors affecting the autotrophic and mixotrophic denitrification performances in sequencing batch reactor (SBR). Findings obtained from this study will shed light on the full-scale applicability of the autotrophic and mixotrophic denitrification processes in carbon deficient wastewaters. In this study, the effect of cycle time, varying concentrations of electron donor source and the addition of external organic carbon source was evaluated by sulfate, nitrate, nitrite, ORP and inorganic carbon parameters. Firstly, SBR was operated with thiosulfate (S2O3 2-) based autotrophic denitrification process at different cycle times (8h-4h-2h). Further, autotrophic denitrification process was optimized the under varying S2O3 2-/ NO3ratios (1.5-1.25-1.0) at the optimum cycle time of 2h. The maximum nitrate removal efficiency of 84% was accomplished at operational conditions containing 2h cycle time and 1.5 S2O3 2-/NO3ratio. In the rest of the study,the impact of increasing C/N ratio by methanol supplementation (0.35-0.7-1.05)was evaluated on mixotrophic denitrification performance. It was observed that nitrate was completely consumed at the C/N ratio of 1.05 and nitrate removal rate improved with increasing methanol supplementation as organic carbon source.

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Effects of hydraulic retention time (HRT) on denitrification using waste activated sludge thermal hydrolysis liquid and acidogenic liquid as carbon sources

Cited by 110 publications

References 32 publications

Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Effectiveness of two-stage horizontal subsurface flow constructed wetland planted with Cyperus alternifolius and Typha latifolia in treating anaerobic reactor brewery effluent at different hydraulic residence times

Evaluation of Thiosulfate-Based Autotrophic and Mixotrophic Denitrification Performances under Different Operational Conditions

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