In-situ sludge degradation and kinetics of a full scale modified activated sludge system achieving near zero sludge production

Apollo, Seth; Seretlo, Manana; Kabuba, John

doi:10.1016/j.jwpe.2023.103864

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…The operation of wastewater plants is indispensable for the abatement of pollution to the downstream environment and promoting a green economy for the industrial process [1]. The study by Flores-Alsina et al [2] showed that a plant's performance may change due to overloaded supernatant recycling to the upstream treatment units, shock loads, inconsistent monitoring, and poor sampling location.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Textile Wastewater Treatment Performance: Optimization and Troubleshooting (Decision Support) via GPS-X Model

Wondim,

Dzwairo,

Aklog

et al. 2023

Processes

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Textile factory water consumption could be optimized to minimize the generation of wastewater, reduce treatment costs, and promote resource recovery. However, downstream plant operation and management is a prime concern in the textile industry, particularly bringing treated wastewater effluent to an acceptable discharge limit. The aim of the study was to optimize key process control parameters to the observed operational challenges of existing processes and suggest an operational guide to the operators and decision makers to enhance the treatment performance in GPS-X. The formulated troubleshooting and decision support strategy, and the optimization results of waste-activated sludge in the primary and secondary clarifiers, was within the range of 15 ± 5 m3/d and 83 ± 7 m3/d, respectively, with a recycle-activated sludge flow of 150 ± 10 m3/d. The sludge retention time was 5 ± 1 d and 6.7 ± 0.5 d in the secondary and primary clarifiers, respectively. The addition of a carbon source in the form of molasses had a flow of 0.5 ± 0.05 m3/d, and the variation in the influent due to wastewater characteristics and rainfall was optimized to 600 ± 50 m3/d. The optimum air flow into the aeration tank was 550 ± 5 m3/hr and saved 91.5% of energy in the optimized process. Thus, the study is indispensable for the effective and efficient operation of the plant and serves as a good guide to the plant operators and decision makers for the best course of action.

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Section: Introductionmentioning

confidence: 99%

Enhancing Textile Wastewater Treatment Performance: Optimization and Troubleshooting (Decision Support) via GPS-X Model

Wondim,

Dzwairo,

Aklog

et al. 2023

Processes

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“…Residual sludge is the main by-product of wastewater treatment plants, which originates from the biomass growth caused by the degradation and consumption of organic pollutants in wastewater. In the activated sludge process, the ratio of COD to sludge is about 0.3-1.2 kg TSS/ kg COD, and the sludge production is huge, which poses a direct or potentially significant threat to the ecological environment (Zou et al, 2022;Apollo et al, 2023). As the main tank of domestic and industrial wastewater, sewage treatment plants contain a large number of polluting substances and are enriched into activated sludge, making these sludge compositions complicated without proper treatment and disposal (Huang et al, 2023;Wang et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Changes in microbial community during hydrolyzed sludge reduction

Liu,

Wu,

et al. 2023

Front. Microbiol.

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In this study, the effects of different enzymes (lysozyme, α-amylase and neutral protease) on sludge hydrolysis efficiency and microbial community in sequencing batch reactor (SBR) were introduced. The results showed that the hydrolysis efficiencies of the three enzymes were 48.5, 22.5 and 31%, respectively, compared with the accumulated sludge discharge of the blank control group. However, it has varying degrees of impact on the effluent quality, and the denitrification and phosphorus removal effect of the system deteriorates. The lysozyme that achieves the optimal sludge hydrolysis effect of 48.5% has the greatest impact on the chemical oxygen demand (COD), total nitrogen (TN), and nitrate nitrogen (NO3−-N) of the effluent. The sludge samples of the control group and the groups supplemented with different enzyme preparations were subjected to high-throughput sequencing. It was found that the number of OTUs (Operational Taxonomic Units) of the samples was lysozyme > α-amylase > blank control > neutral protease. Moreover, the abundance grade curve of the sludge samples supplemented with lysozyme and α-amylase was smoother, and the community richness and diversity were improved by lysozyme and α-amylase. The species diversity of the sludge supplemented with lysozyme and neutral protease was great, and the community succession was obvious. The introduction of enzymes did not change the main microbial communities of the sludge, which were mainly Proteobacteria, Actinobacteria and Bacteroidetes. The effects of three enzyme preparations on sludge reduction and microbial diversity during pilot operation were analyzed, the gap in microbial research was filled, which provided theoretical value for the practical operation of enzymatic sludge reduction.

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Ozone combined with mechanical agitation to enhance sludge cell lysis and provide an alternative carbon source for nitrogen removal of bioreactors

Zhang,

Li,

Wang

et al. 2024

Journal of Water Process Engineering

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In-situ sludge degradation and kinetics of a full scale modified activated sludge system achieving near zero sludge production

Cited by 5 publications

References 20 publications

Enhancing Textile Wastewater Treatment Performance: Optimization and Troubleshooting (Decision Support) via GPS-X Model

Enhancing Textile Wastewater Treatment Performance: Optimization and Troubleshooting (Decision Support) via GPS-X Model

Changes in microbial community during hydrolyzed sludge reduction

Ozone combined with mechanical agitation to enhance sludge cell lysis and provide an alternative carbon source for nitrogen removal of bioreactors

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