Advances in pretreatment strategies to enhance the biodegradability of waste activated sludge for the conversion of refractory substances

Liu, Xuran; Wang, Dongbo; Chen, Zhijie; Wei, Wei; Mannina, Giorgio; Ni, Bing‐Jie

doi:10.1016/j.biortech.2022.127804

Cited by 24 publications

(5 citation statements)

References 134 publications

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“…To better reuse the nonintact hollow fiber membranes as biofilm carriers, we can propose a substrate-induced way to control the biofilm community assembly processes dominated by deterministic processes. Such a method can realize the enrichment of specific bacteria by providing targeted substrates in the bioreactor . In addition, although the reuse of nonintact membranes as biofilm carriers for the biological treatment process (i.e., postdenitrification systems) is of low cost, this process is limited by the low packing density (71 m 2 /m 3 ) as compared to the commercial K1 materials.…”

Section: Resultsmentioning

confidence: 99%

“…Such a method can realize the enrichment of specific bacteria by providing targeted substrates in the bioreactor. 88 In addition, although the reuse of nonintact membranes as biofilm carriers for the biological treatment process (i.e., postdenitrification systems) is of low cost, this process is limited by the low packing density (71 m 2 /m 3 ) as compared to the commercial K1 materials. Thus, in the future, it should provide more solutions to convert these solid wastes into other value-added products via post-treatment, such as surface chemical modification.…”

Section: Applications and Perspectivesmentioning

confidence: 99%

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Advanced Nitrogen Removal in a Denitrification Bioreactor Using Nonintact Hollow Fiber Membranes as Biofilm Carriers

Gan,

Yu,

Wang

et al. 2023

ACS EST Eng.

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The selection of biofilm carriers is essential for enriching functional microorganisms. In this study, nonintact hollow fiber membranes were designed as immobilized biofilm carriers in a denitrification bioreactor (DNBR) for treating nitrate in the effluent of wastewater treatment plants. The DNBR performance was studied at varying hydraulic retention times of 18 to 3 h. Results showed that effluent concentrations of total nitrogen (TN) were maintained below 5 mg/L, corresponding to 75.6–84.8% TN removal. The batch tests also showed that the biofilms on nonintact membranes exhibited higher denitrification activities than the sludge flocs (i.e., detached biofilms) in the bioreactor. The 16S rRNA sequencing indicated that the denitrification performance of biofilms was attributed to the enrichment of denitrifying bacteria, particularly Azospira (relative abundance up to ca. 36.5%). Additionally, the colonization of biofilms was dominated by stochastic community assembly processes. The metagenomic analysis revealed that the biofilms harbored abundant functional genes responsible for biofilm formation, glucose metabolism, and nitrogen metabolism. Overall, the reuse of nonintact hollow fiber membranes as biofilm carriers for nitrate removal can be considered a novel approach for “treating waste with waste”.

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Section: Resultsmentioning

confidence: 99%

Section: Applications and Perspectivesmentioning

confidence: 99%

Advanced Nitrogen Removal in a Denitrification Bioreactor Using Nonintact Hollow Fiber Membranes as Biofilm Carriers

Gan,

Yu,

Wang

et al. 2023

ACS EST Eng.

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“…In contrast, based on the other three models, the predictive value of F max is associated with an increase in C2. According to a previous study, humic-like substances have been identified as unavailable carbon sources that critically inhibit the biodegradability of aerobic treatment [79]. Therefore, the GBDT-based model developed in this study presents more reasonable trends than the other three models.…”

Section: Sensitivity Analysis Of Fluorescent Componentsmentioning

confidence: 86%

Insightful Analysis and Prediction of SCOD Component Variation in Low-Carbon/Nitrogen-Ratio Domestic Wastewater via Machine Learning

Zhang,

Guo,

Luo

et al. 2024

Water

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The rapid identification of the amount and characteristics of chemical oxygen demand (COD) in influent water is critical to the operation of wastewater treatment plants (WWTPs), especially for WWTPs in the face of influent water with a low carbon/nitrogen (C/N) ratio. Given that, this study carried out batch kinetic experiments for soluble chemical oxygen demand (SCOD) and nitrogen degradation for three WWTPs and established machine learning (ML) models for the accurate prediction of the variation in SCOD. The results indicate that four different kinds of components were identified via parallel factor (PARAFAC) analysis. C1 (Ex/Em = 235 nm and 275/348 nm, tryptophan-like substances/soluble microbial by-products) contributes to the majority of internal carbon sources for endogenous denitrification, whereas C4 (230 nm and 275/350 nm, tyrosine-like substances) is crucial for readily biodegradable SCOD composition according to the machine learning (ML) models. Furthermore, the gradient boosting decision tree (GBDT) algorithm achieved higher interpretability and generalizability in describing the relationship between SCOD and carbon source components, with an R2 reaching 0.772. A Shapley additive explanations (SHAP) analysis of GBDT models further validated the above result. Undoubtedly, this study provided novel insights into utilizing ML models to predict SCOD through the measurements of the excitation–emission matrix (EEM) in specific Ex and Em positions. The results could help us to identify the degradation and transformation relationship between different kinds of carbon sources and nitrogen species in the wastewater treatment process, and thus provide a novel guidance for the optimized operation of WWTPs.

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“…Their presence in surface water or groundwater is an indication of a source of pollution [13]. In most cases under aerobic conditions, PAHs are only slowly biodegradable but are stable for hydrolysis [14]. The relative concentrations of PAHs in air, water, and food are usually the same, although this can change depending on certain sources of pollution [13].…”

Section: Introductionmentioning

confidence: 99%

Determination of Polycyclic Aromatic Hydrocarbons in the Water of Ijegun-Egba Community of Lagos State, Nigeria

Tovide,

Eterigho,

Adewale

2023

JRRS

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Introduction: Polycyclic Aromatic Hydrocarbons (PAHs) are common pollutants in water that have been reported to cause severe health effects in humans and harm the ecosystem. Aims: This study examined the concentrations of PAHs in different water sources used for domestic purposes in Ijegun- Egba community. Materials and Methods: Twenty-four (24) groundwater samples were collected from four sites in Ijegun-Egba. The Physicochemical parameters were determined using standard methods and PAHs were determined through Gas chromatography-flame – Flame ionization detector. Results: The appearance, odour, and temperature were within the limits of World Health Organisation (WHO). Conductivity levels were within the WHO limit (2,500µS/cm) in well water (1,400µS/cm) and borehole water (1,470 µS/cm) except for river water (4,432.5 µS/cm) which was above WHO recommended limit (2,500µS/cm). pH was within limits in all sites studied except for borehole water (pH =4.0). Among the 16 PAHs, Naphthalene (NAPH) was generally the most abundant PAH (23.89% to Σ16PAHs). There was a significant difference (at < 0.005) in the level of PAHs in the four sources of water. Conclusion: River water has the highest level of PAHs. This points to the activities of the tank farms and suggests that petrol and oil deposits find themselves either through percolation, soil runoffs, or erosion into the water bodies. The Lagos State Environmental Protection Agency should continue to monitor the activities of oil tankers in Ijegun community oil deports. Truck stations should be built outside the community and the residents should avoid the use of water from rivers in Ijegun community.

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Advances in pretreatment strategies to enhance the biodegradability of waste activated sludge for the conversion of refractory substances

Cited by 24 publications

References 134 publications

Advanced Nitrogen Removal in a Denitrification Bioreactor Using Nonintact Hollow Fiber Membranes as Biofilm Carriers

Advanced Nitrogen Removal in a Denitrification Bioreactor Using Nonintact Hollow Fiber Membranes as Biofilm Carriers

Insightful Analysis and Prediction of SCOD Component Variation in Low-Carbon/Nitrogen-Ratio Domestic Wastewater via Machine Learning

Determination of Polycyclic Aromatic Hydrocarbons in the Water of Ijegun-Egba Community of Lagos State, Nigeria

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