Response of a sludge-minimizing lab-scale BNR reactor when the operation is changed to real primary effluent from synthetic wastewater

Huang, Pei; Goel, Ramesh

doi:10.1016/j.watres.2015.04.035

Cited by 12 publications

(7 citation statements)

References 49 publications

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“…On one hand, the Increase of sludge quantity resulted in a serious interest, leading to more recovery of energy in biogas through the anaerobic digestion [GE et al 2013]. On the other hand, their production in excess remains a delicate problem for the process, implying the need for the development of a process which controls these big masses [HUANG, GOEL 2015]. The effect of an increase of the extraction flow rate in the mass budget, with respect to a reference discharge in the model, is first examined.…”

Section: Souk-ahras Wwtpmentioning

confidence: 99%

Dynamic simulation for wastewater treatment plants management: Case of Souk-Ahras region, north-eastern Algeria

Dairi

Djebbar

Hammar

et al. 2017

Journal of Water and Land Development

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Treatment performances of two wastewater treatment plants (WWTPs), located in North-Eastern Algeria (Souk-Ahras and Sedrata) were tested using ASM1 model.The model, to be considered as a decision tool for the appropriate management of activated sludge systems, served for the prediction of both WWTP behaviours under different operating conditions. In Sedrata WWTP the first management scenarios is based on an increase of inflow rate, taking into account a new transfer volume from a nearby zone. In a second scenerio, the ultimate flow of 40 000 m 3 ·d -1 is estimated. Regarding Souk-Ahras WWTP, three scenarios were tested. The first tested the impact of an increase of the extraction flow rate and yielded a reduction by 37% of sludge production. The second dealt with the management of the mass budget of substrata and biomass. Finally, the third application was devoted to the estimation of the plant ultimate capacity, estimated to be 60 000 m 3 ·d -1.

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Section: Souk-ahras Wwtpmentioning

confidence: 99%

Dynamic simulation for wastewater treatment plants management: Case of Souk-Ahras region, north-eastern Algeria

Dairi

Djebbar

Hammar

et al. 2017

Journal of Water and Land Development

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“…The main purpose of wastewater treatment plants (WWTP) is to reduce harmful emissions toward water bodies. Municipal and industrial wastewater is most often treated with conventional activated sludge processes [1]. Despite its high efficiency in removing organic matter, the process produces large amounts of waste activated sludge (WAS) that must be periodically removed.…”

Section: Introductionmentioning

confidence: 99%

“…Despite its high efficiency in removing organic matter, the process produces large amounts of waste activated sludge (WAS) that must be periodically removed. Moreover, treating excess sludge may account for up to 65% of a plant's operating costs [1,2]. New technologies producing less sewage sludge are thus needed.…”

Section: Introductionmentioning

confidence: 99%

“…Primary sewage and waste activated sludge from WWTP are usually thickened prior to mixing, stabilized by anaerobic or aerobic digestion and dewatered. Ultimately, sludge is disposed of or valorized by either agricultural usage (composting followed by application to soil), landfilling or thermal treatment [1][2][3]. One of the main hindrances to stabilizing sewage sludge is the low biodegradability of WAS relative to primary sewage sludge (PSS) owing to the rigid structure of the former preventing cell wall disruption and the release of inner cell products, which otherwise facilitate the breakdown of the overall mass.…”

Section: Introductionmentioning

confidence: 99%

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Anaerobic co-digestion of the process water from waste activated sludge hydrothermally treated with primary sewage sludge. A new approach for sewage sludge management

et al. 2020

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Hydrothermal carbonization (HTC) is a suitable technology for managing wastes with a high moisture content, providing a carbon-rich and high energy density material called hydrochar and a process water (PW) with significant organic matter content. The aim of this work was to develop a new approach to sewage sludge management involving anaerobic digestion (AD) of the PW of dewatered waste activated sludge (DWAS) with primary sewage sludge (PSS). The process was optimized by performing semi-continuous experiments with different feed mixture compositions (10% PW/90% PSS and 5% PW/95% PSS, on a COD basis), organic loading rates (OLR; 1.5 and 2.5 g COD L -1 d -1 ), and temperature regimes (mesophilic and thermophilic). The combination of mesophilic conditions, a 10% PW/ 90% PSS feed mixture and OLR of 1.5 g COD L -1 d -1 provided concentrations of volatile fatty acids < 400 mg COD L -1 in addition to a methane yield (172 ± 11 mL CH4 g -1 CODadded), 1.15 times the value for the control test (100% PSS). Therefore, the energy content of hydrochar from HTC of DWAS followed by AD of the process water with primary sewage sludge enhances the valorization of this renewable residue.

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“…Meanwhile, sewage treatment plants use phosphate accumulating organisms (PAOs) to eliminate biochemical oxygen demand (BOD), phosphorous, and nitrogen in anaerobic reactors, oxic reactors, and anoxic reactors. In the same manner, the application of PAOs to secondary concrete products and structures is expected to ensure outstanding water purification effects; little research, however, has been conducted on this approach [8][9][10].…”

Section: Methodsmentioning

confidence: 99%

Strength and Water Purification Properties of Environment-Friendly Construction Material Produced with the (D)PAOs and Zeolite

Jang

Lee

2019

Applied Sciences

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The goal of this study was to improve the water purification performance of secondary concrete products that can be used in rivers and streams. To this end, mortar and porous concrete were produced by adding both de-nitrifying phosphate accumulating organisms ((D)PAOs) and zeolite, and their mechanical properties and water purification performance were analyzed. The compression strength test results showed that the strength was the highest when the mixing ratios of (D)PAOs and zeolite were set to 10% and 5%, respectively. For better contaminant adsorption, however, the optimal mixing ratio of zeolite was determined to be 10%. When the mixing ratio of (D)PAOs was set to 10%, the concentrations of biochemical oxygen demand (BOD) and chemical oxygen demand (COD) decreased by 57.9% and 89.9%, respectively, after seven days of immersion when compared to the initial concentrations. When compared to plain porous concrete, the total nitrogen (T-N) and total phosphorus (T-P) removal ratios of the develop concrete were 11.0% and 17.8% higher, respectively. When the mixing ratios of (D)PAOs and zeolite were set to 10% for both, the T-N and T-P removal ratios were determined to be 86.3% and 88.1%, respectively, while the BOD and COD concentrations were 2.668 mg/L and 16.915 mg/L, respectively. In simpler terms, the water purification performance was up to 17% higher in the concrete mixed with both 10% (D)PAOs and 10% zeolite than in the concrete mixed with 10% (D)PAOs only. Overall, the optimal mixing ratios of (D)PAOs and zeolite to maximize the water purification effect of secondary concrete products while maintaining their strengths equivalent to or higher than those of their corresponding plain concrete products are considered to be 10% for both.

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Response of a sludge-minimizing lab-scale BNR reactor when the operation is changed to real primary effluent from synthetic wastewater

Cited by 12 publications

References 49 publications

Dynamic simulation for wastewater treatment plants management: Case of Souk-Ahras region, north-eastern Algeria

Dynamic simulation for wastewater treatment plants management: Case of Souk-Ahras region, north-eastern Algeria

Anaerobic co-digestion of the process water from waste activated sludge hydrothermally treated with primary sewage sludge. A new approach for sewage sludge management

Strength and Water Purification Properties of Environment-Friendly Construction Material Produced with the (D)PAOs and Zeolite

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