Visible-light-sensitive highly-efficient photocatalytic degradation of hazardous contaminant fast yellow AB in industrial wastewater using zinc ferrite nano-photocatalyst: synthesis, characterization and removal performance

TiO2-doped mesoporous silica (TDMS) was synthesized in situ from coal fly ash for photocatalytic degradation of organic dyes. The prepared TDMS is mainly composed of SiO2 and anatase TiO2 and has a sponge-like mesoporous structure with a high specific surface area of 297 m2/g. In photocatalytic experiments, TDMS shows good performance in the removal of dyes. The decoloration rates of both rhodamine B and acid orange II reached 99.9% within 6 h at a TDMS dosage of 4 g/L, and the total organic carbon (TOC) removal efficiency reached 90.3 and 84.1%, respectively. Furthermore, whereas the dye decoloration rate of TDMS is comparable to that of commercial TiO2 (anatase), it shows much better TOC removal efficiency. The results indicate that TDMS can be a potential and low-cost photocatalyst for treating water polluted with dyes.

Microbial community structure and functional prediction in five full-scale industrial park wastewater treatment plants

As the process of industrialization accelerates, finding effective methods for industrial wastewater treatment has become an important task in the field of environmental protection. However, despite the preparation methods and properties of biochar have been studied, its large-scale application in industrial wastewater treatment has not yet been fully understood and clarified. This paper first analyzes the industrial wastewater to be treated, and combines the mechanism of biochar in treating industrial wastewater, elaborates the cases of biochar applied in real life and the corresponding difficulties. The research results show that biochar is a material with good application potential for industrial wastewater treatment. Its high specific surface area and rich surface functional groups give it good adsorption capacity for various pollutants in industrial wastewater. In addition, the adsorption performance of biochar can be optimized by adjusting its preparation and application conditions. Future research should further explore the long-term stability of biochar in the treatment of industrial wastewater, as well as its application effect in the actual industrial environment. In addition, the development of efficient, economical, and controllable technologies for the preparation and application of biochar, and promoting its large-scale application in industrial wastewater treatment, are also important directions for future research. The research in this paper is of great significance for understanding and utilizing biochar for the treatment of industrial wastewater. The results not only help to improve the efficiency and effectiveness of industrial wastewater treatment, but also provide new ideas and methods for the high-value utilization of waste biomass. Therefore, this research has important theoretical and practical value for promoting the development of industrial wastewater treatment technology and achieving sustainable utilization of environmental protection and resources.

Simultaneous removal of carbonaceous and nitrogenous pollutants by a plunging liquid jet bioreactor with crossflow filtration operated under intermittent aeration

Photocatalytic degradation of dyes using semiconductor photocatalysts to clean industrial water pollution

Membrane aerated biofilm reactors (MABRs) have emerged as a promising technology for wastewater treatment, offering significant advantages over conventional activated sludge (CAS) systems. Over the past decades, membrane processes have revolutionized municipal water treatment with membrane bioreactors (MBRs) becoming a widely accepted process for municipal and then industrial wastewater (IW) treatment. By the same token, MABR technologies were initially applied to municipal wastewater; however, their application in industrial settings is still emerging. Despite the promise of MABRs due to the biofilm's tolerance to IW toxins, there is a lack of information on their industrial applications. Therefore, this paper critically reviews the feasibility and application of MABRs for IW treatment, including pharmaceutical, chemical, refinery, petrochemical, oilfield, landfill leachate and other complex industrial waters. Three existing technology vendors with full-scale experience were compared; however, additional providers with innovative designs may provide step-changes in performance. Key outcomes highlight the effectiveness of MABRs in reducing carbon, nitrogen, and xenobiotics from high-strength IWs at bench and pilot scales. Critical factors influencing MABR performance, such as biofilm thickness (BT) were correlated to organics and nitrogen removal efficiency in industrial applications. Review of advances in MABR modeling techniques showed that current models lack the needed resolution for large and dynamic industrial systems. Additionally, the review compares municipal and industrial applications of MABRs, emphasizing the unique challenges and innovations required for their adoption in IW treatment. Overall, the MABR process was found to be feasible for industrial applications with pilot and/or demonstration-scale testing being necessary to further optimize process performance.

Enhanced ROS generation by ZnO-ammonia modified graphene oxide nanocomposites for photocatalytic degradation of trypan blue dye and 4-nitrophenol

This study aims to investigate the performances of widely used anode materials in the treatment of intermediate landfill leachate treatment by electrooxidation (EO) process. The raw leachate was collected from an 8‐year‐old landfill facility and had a chemical oxygen demand (COD) of 4660 mg/L, biological oxygen demand (BOD5) of 1370 mg/L, and total organic carbon (TOC) of 2260 mg/L. TOC and COD removal efficiencies of Boron‐Doped Diamond (BDD), Pt, and four different Ti‐based mixed metal oxide (MMO) anodes ((RuO2–TiO2, RuO2–IrO2, PtO2–IrO2, and IrO2–Ta2O5) were compared at the current densities of 25 mA/cm2, 75 mA/cm2, and 125 mA/cm2. At the highest current density, the BDD achieved 100% TOC and COD removal efficiencies in 240 min. BDD was followed by the Pt anode, which achieved 95.53% COD and 92.74% TOC removal efficiencies. The Pt electrode also had the lowest SEC values at all current densities. Although the performances of four MMO electrodes were very close, RuO2–TiO2 achieved a slightly higher performance than the others. It was concluded that Pt anode can be a promising alternative to BDD, which was 18 times more expensive, with its comparable pollutant removal performance and low specific energy consumption.

Response surface methodology (RSM) was applied to find the optimum parameters for COD and TOC removal from saline wastewaters using electrochemical oxidation process. The independent variables considered were reaction time, pH, salt concentration, and voltage. Optimization of parameters was performed by analysis of variance (ANOVA). Quadratic regression equation was suggested as a model for prediction of chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiency. The results indicated that the COD and TOC removal efficiencies at the optimal conditions of pH 7.69, reaction time of 30.71 min, salt content of 30. 94 g/L and voltage of 7.41 V were 91.78% and 68.49%, respectively. In terms of COD and TOC removal efficiency, the coefficients of determination were found to be 0.95 and 0.94, respectively. This study suggests that electro-oxidation is an effective process in decreasing COD and TOC from saline wastewaters. Further, RSM was a suitable technique for optimization of the variables involved in COD and TOC removal through electro-oxidation process.•The findings demonstrate that response surface methodology is a good tool for the optimization of parameters of the experimental data.•A quadratic model was suggested as a good model for COD and TOC removal prediction.•The findings proved good agreement between the experimental data and the predicted equation.

With the prosperity of China's industry, the contradiction between industrial economic development and water pollution has become increasingly prominent, which hinders the sustainable development of society. In recent years, Hubei Province has issued a number of policies to vigorously guide industrial wastewater treatment, but the treatment effect is very little. This paper selects the industrial wastewater pollution and treatment in Hubei Province from 2001 to 2020 as an example, and uses the model and multiple linear regression analysis method to study and analyze the factors affecting the industrial wastewater pollution treatment in Hubei Province. The conclusion shows that the improvement of capital, technology and environmental awareness is conducive to promote the benign development of industrial wastewater treatment. Therefore, the government should strengthen overall planning and scientifically make regional targeted governance arrangements; Continue to increase capital investment and guide the implementation of high-tech achievements; Rectify industrial chaos and withdraw from inefficient and heavily polluting enterprises; Optimize regional industrial layout and reasonably match spatial resources.

Mineralization of phenol by ozone combined with activated carbon: Performance and mechanism under different pH levels

One of the major problems faced by mankind today is of water pollution. There are various methods available for treatment of waste water. The conventional and mechanical methods of treatment of industrial waste water quite expensive and are thus uneconomical for industries of lower turnover rate. The search is for economical and efficient methods. Use of vascular plants for pollution abatement is recent trend. The present work is directed towards the use of aquatic plant Eichhornia crassipes i.e., Water hyacinth for treatment of industrial waste and the objectives of work are to study feasibility of treatment, number of days required for the treatment, effect of operating tank depth, effect of pre-treatment and effect of Nutrients by observing change in various physical, chemical and biological parameters.

A prior knowledge-enhanced Transformer model for data anomaly identification and processing in industrial park wastewater treatment plants.

The preparation of biochar (BC) as a useful substance generated from biomass valorization via pyrolysis has attracted much attention in recent years. Moreover, widespread worries about water pollution and the issues brought on by producing and releasing massive volumes of industrial effluents have sparked research initiatives to examine practical and affordable solutions to these problems. Dyes, heavy metals, and pharmaceutical compounds are the main hazardous pollutants in industrial wastewater. As a result, biochar (BC)/biochar (BC)-based nanocomposites have been presented as a potential alternative to handle wastewater pollution with both adsorption and photocatalytic degradation processes. Such nanocomposite materials benefit from the synergistic effect of adsorption and photocatalysis to attain improved removal of pollutants from industrial wastewater. Therefore, this review aims to describe different preparation methods for biochar and biochar-based nanocomposites. Furthermore, the differences between the adsorption and photocatalytic degradation processes are discussed. BC-based nanocomposites have emerged as promising adsorbents and photocatalysts for wastewater treatment applications. To maximize the efficiency of these processes, an overview of the parameters affecting pollutants removal from wastewater via adsorption and photocatalytic degradation processes is reviewed, where biochar dose, initial pollutant concentration, pH, temperature, time, the presence of different anions, and recycling are discovered to have a significant impact on their performance. Finally, future recommendations and research directions are provided to help shape the applications of BC-based nanocomposites for wastewater treatment applications. This review offers a comprehensive evaluation of the use of biochar as a new environmental material capable of removing pollutants from wastewater. Graphical Abstract

Utilization of self-synthesized ZnO nanoparticles in MPR for industrial dye wastewater treatment using NF and UF membrane