Improved energy balance at a municipal wastewater treatment plant through waste activated sludge low-temperature alkaline pretreatment

Budych-Gorzna, Magdalena; Jaroszyński, Łukasz; Oleśkowicz-Popiel, Piotr

doi:10.1016/j.jece.2021.106366

Cited by 10 publications

(3 citation statements)

References 51 publications

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“…Although these values were decreased with reducing the HRT to 20 and 15 days, HTAP continued to present a higher efficiency than the individual thermal one. Among the several studies, Gorzna et al [211] also highlighted that solely heating at 60 • C for 60 min revealed almost a 2-fold lower SCOD than that obtained when combined with NaOH dosing of 16 g NaOH/kg TS. That indicated the high organic matter solubilization obtained under these conditions.…”

Section: Combined Pretreatment Methodsmentioning

confidence: 99%

“…Thermo-chemical pretreatment also exhibits improved organic matter solubilization in comparison to the corresponding single pretreatments, as evidence of attaining the advantages of both methods [209,210]. Commonly, chemical pretreatment is performed with the addition of alkali agents [51,211,212], ozone, or hydrogen peroxide [70], and is combined with either low (50 to 90 • C), or high (115 to 170 • C) temperature for pretreatment [15,205]. Although high temperature chemical-assisted pretreatment (HTCP) has been reported to reveal appreciable results regrading COD solubilization and AD performance enhancement [213], it is energy-intensive and capable of offsetting the bioenergy produced by pretreatment heat and electricity needs [212].…”

Section: Combined Pretreatment Methodsmentioning

confidence: 99%

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A Comprehensive Review on Pretreatment Methods for Enhanced Biogas Production from Sewage Sludge

et al. 2022

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The treatment of municipal wastewater is considered a cornerstone for the protection of public health and environment. However, a major issue derived from this process is the large quantities of produced sewage sludge. Although anaerobic digestion is a widely applied method in Wastewater Treatment Plants (WWTPs) aiming to stabilize the sludge and to recover energy in the form of methane, it is usually limited due to the reduced decomposition efficiency and slow biodegradation rate of this recalcitrant substrate. For this reason, various pretreatment methods have been proposed aiming to modify the sludge structure, solubilize the organic matter, and decrease the crystallinity of sludge so as to accelerate hydrolysis and consequently enhance methane production. The current research is a comprehensive collection of recent advances in pretreatment technologies that can be potentially applied in wastewater treatment facilities. The critical review analysis presented herein reveals the several advantages and drawbacks, as well as the technical opportunities of the pretreatment methods and provides an assessment of their feasibility/applicability from an energetic, environmental, and economic point of view.

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Section: Combined Pretreatment Methodsmentioning

confidence: 99%

Section: Combined Pretreatment Methodsmentioning

confidence: 99%

A Comprehensive Review on Pretreatment Methods for Enhanced Biogas Production from Sewage Sludge

et al. 2022

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“…In addition, the formed hydroxide flocculates microbial debris, organic matter, and inorganic particles; flocculates the sludge; and reduces sludge volume and the cost of sludge treatment and disposal. Budych-Gorzna et al [43] investigated low-temperature alkaline pretreatment (WAS) as a method to improve the economics of water treatment plants. Results showed that methane production increased from 210.4 × 10.9 mL CH 4 /gVS to 248.8 × 13.1 mL CH 4 /gVS at 16 g NaOH/kg TS WAS, 60 • C, 60 min, methane production was increased by 27% and the dewatered sludge volume was reduced by 8.7%.…”

Section: Acid-base Conditioningmentioning

confidence: 99%

Advances in Chemical Conditioning of Residual Activated Sludge in China

Liang

Wang

Sun

et al. 2023

Water

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Municipal sludge is characterized by high organic matter content, high viscosity, and fine particles, resulting in poor dewatering performance. This article analyzes the composition and properties of municipal sludge, examines the factors affecting the dewatering performance of sludge and the mechanisms corresponding to each influencing factor, and introduces chemical conditioning in detail. Chemical conditioning includes flocculation conditioning, oxidation conditioning, acid-base conditioning, and aggregate conditioning. The principles and applications of existing sludge conditioning technologies are systematically analyzed. By comparing the advantages and disadvantages of different technologies, it is pointed out that the key to developing sludge conditioning technology lies in developing a more appropriate combination of the sludge conditioning and dewatering process according to the sludge quality of different municipal wastewater treatment plants, taking into account their local environment, input costs, subsequent sludge disposal methods, and other factors, and further optimizing the sludge dewatering process by developing new efficient and environmentally friendly sludge conditioning agents.

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Fault detection and diagnosis of the wastewater nitrate and nitrite sensors using PCA and FDA combined with assessment of the economic and environmental impact of the faults

Luca,

Simon-Várhelyi,

Mihály

et al. 2025

Environ Monit Assess

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One of the leading challenges in Water Resource Recovery Facility monitoring and control is the poor data quality and sensor consistency due to the tough and complex circumstances of the process operation. This paper presents a new principal component analysis fault detection approach for the nitrate and nitrite concentration sensor based on Water Resource Recovery Facility measurements, together with the Fisher Discriminant Analysis identification of fault types. Five malfunction cases were considered: constant additive error, ramp changing error in time, incorrect amplification error, random additive error, and unchanging sensor value error. The faults’ implementation, fault detection, and identification methods are presented and evaluated in terms of accuracy and promptitude. The models are originating from a municipal plant. The amount of required electrical energy and greenhouse gas released during the Water Resource Recovery Facility operation were assessed for the cases of nitrates and nitrites NO sensor normal and malfunctioning regimes. The environmental and economic evaluations show the benefits of detecting and identifying nitrates and nitrites NO sensor defects aimed at providing efficient and environmentally friendly operation of the Water Resource Recovery Facility. The fault-affected operation cases showed increased values, up to 10% for the total energy demand and 4% for the total greenhouse gas emissions, when they are compared to the normal operation case.

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Improved energy balance at a municipal wastewater treatment plant through waste activated sludge low-temperature alkaline pretreatment

Cited by 10 publications

References 51 publications

A Comprehensive Review on Pretreatment Methods for Enhanced Biogas Production from Sewage Sludge

A Comprehensive Review on Pretreatment Methods for Enhanced Biogas Production from Sewage Sludge

Advances in Chemical Conditioning of Residual Activated Sludge in China

Fault detection and diagnosis of the wastewater nitrate and nitrite sensors using PCA and FDA combined with assessment of the economic and environmental impact of the faults

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