Sewage sludge processing and disposal have a significant weight on the energy and economic balances of wastewater treatment operations and contribute substantially to greenhouse gas emissions related to wastewater processing. Despite this, sewage sludge contains substantial recoverable resources in the form of energy and …Web
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Syngas is a high-value product of the sludge gasification process, as it can be burnt in gas engines and turbines ... E., M. Nieminen, and P. Simell. 2004. Development and commercialisation of biomass and waste gasification technologies from reliable and robust cofiring plants towards synthesis gas production and advanced cycles. 2nd World ...Web
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The introduction of Activated Sludge Models No. 1 (ASM1) in the early 1980s has led to a decade-long experience in applying these models and demonstrating their …Web
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1. Introduction. A considerable amount of oily sludge can be generated from the petroleum industry during its crude oil exploration, production, transportation, storage, and refining processes [1], [2].In particular, the sludge generated during the petroleum refining process has received increasing attention in recent years.Web
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Full-scale wastewater treatment plants utilizing aerobic granular sludge technology are being built in many countries worldwide. As with all biological wastewater treatment plants, the produced waste biomass must be stabilized to protect the population, wildlife, and the environment. Digestion is usually used to break down the complex …Web
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Sewage sludge (SS) is a biosolid that includes nutrients, organic matter, and a mixture of micropollutants and pathogens. Regarding its final disposal, several criteria should be met to avoid the dissemination of the included micropollutants in the environment. Hence, an adequate treatment prior to SS disposal is highly required. Solar drying is …Web
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1. Introduction. Aerobic granulation may play an important role in the field of wastewater treatment due to the advantages over the conventional activated sludge system, such as denser aggregate structure, better solid-liquid separation, higher biomass concentration (Liu et al., 2009, Buaisha et al., 2020) or even its ability to treat wastewater …Web
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Wastewater sludge produced from the primary, secondary and tertiary treatment processes. It mainly composed of many organic and inorganic materials. Some of the materials removed by physical and ...Web
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In this review, several keywords, such as aerobic granulation, continuous-flow aerobic granular sludge, selection pressure, feast-famine conditions, and reactor configuration were searched in Web of Science's database.A total number of 81 peer-reviewed journal articles on CAGS have been collected for the period of 2010 to 2022 …Web
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Oily sludge contains large amounts of oil emulsions, water, heavy metal ions, and other recyclable resources composed of hydrocarbons and refractory petroleum hydrocarbons, which are a renewable energy with high potential value (Hu et al., 2020).In addition, with the continuous updating of environmental friendliness, sustainability, and …Web
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evaporating the water. Water removal is made easier by modifying the sludge through chemical or thermal treatment. These treatment processes are referred to as sludge conditioning, and act by changing the size and/or other characteristics of the sludge suspended solids. Sludge process types Credit: Judd Water & Wastewater …Web
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Converting sludge to fertilizer has many advantages. First of all, this process, apparently from all methods of sludge management, is part of the closed cycle trend—the sludge formed in the process of wastewater treatment after modifications returns to the environment as a full-value fertilizer that brings benefits to nature (Figure …Web
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A rational foundation of the activated sludge process for the removal of organic carbon could then be established based on mass balance. This approach also defined essential parameters that could relate microbial reactions involved with plant design and operation. ... Scientific ideas and discoveries have also enabled conceptual …Web
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Bai et al. 28 observed similar results and concluded that biofilm is a better environment than activated sludge for the development of Denitratisoma, Rhodobacter and Dechlorosoma, due to the ...Web
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The activated sludge (AS) process is one of the most widely used biological aerobic methods for wastewater treatment. ... Sludge development was monitored weekly using microscopic images provided by a Leica DM2000 microscope. The microscope was coupled to a camera (Leica), allowing monochrome images to be collected at 400× …Web
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In this study, we argued that substantial improvement in the energy efficiency might be no longer achievable through further optimization of the activated sludge process. Instead, we should devote more effort …Web
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Between the 59th and 184th day of operation, numerous microorganisms were detected on the fibers and in the activated sludge, testifying to low biological oxygen demand, good aerobic conditions for nitrification, and long sludge age. However, the process seemed to break down after day 72, when the occurrence of metazoan led to …Web
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central to sustainable development. Wastewater is a key element in the water–food–energy nexus, and recovery of resources can link water, nutrient and ... recently developed aerobic granular sludge (GS) process is a better replacement for AS and promises sustainable wastewater treatment for at least the next century. The GS process uses ...Web
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Further research should be conducted with continuous-flow reactors using different types of sewage sludge and cosolvents. Particularly, increasing the sewage sludge concentration to around 20–25% without losing the flowability of the slurry for continuous HTL is critical in terms of process development to the industrial scale . A …Web
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Sludge granulation. Granulation of the sludge results from biotic and abiotic interactions between microorganisms and sludge particles, resulting in the development of very compact spherical-shaped aggregates with a diameter of approximately 1–3 mm (Fig. 1) where the microbial cells are self-immobilized in a matrix of EPS.Several granulation …Web
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sewage treatment that became widely ments, technical or social. known as the activated sludge process. Since that time it has been applied The Gestation Period extensively …Web
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Abstract The paper presents a critical overview of the first 50 years in the evolution of the activated sludge process. Recognition of the role of aeration and …Web
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With increasing population and urbanization, the amount of municipal sewage sludge generated is huge and growing rapidly. In order to minimize resource inputs and pollutant emissions in the sludge disposal process, it is crucial to carry out an environmental impact analysis and sustainability assessment of different strategies …Web
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Granulation of the sludge results from biotic and abiotic interactions between microorganisms and sludge particles, resulting in the development of very compact spherical-shaped aggregates with a diameter of approximately 1–3 mm (Fig. 1) where the microbial cells are self-immobilized in a matrix of EPS.Several granulation mechanisms …Web
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The whole process of sludge combustion is usually divided into five stages: (a) dehydration; (b) release of organic matters; (c) fixed carbon combustion; (d) …Web
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Abstract Excess sludge production in wastewater treatment plants has become an enormous environmental issue worldwide mainly due to the increased efforts …Web
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This process is common during combustion of wet sludge, particularly waste of Energies 2019, 12, 60 17 of 38 bulky particle sizes and is referred to as auto-gasification due to the high steam ...Web
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Four mainstream process routes of sludge treatment from the perspective of carbon neutralisation are analyzed. The route with the highest potential for reducing carbon emissions is proposed. ... The future development directions for sludge treatment and resource recovery are also provided. This paper provides a comprehensive …Web
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This article aims to carry out a survey of the alternatives adopted to transform the ferric sludge resulting from advanced, highly polluting oxidative processes into a …Web
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Paper sludge at 20 g/L solids was disintegrated at 37,500 rpm in a laboratory mixer (British pulp evaluation apparatus, Mavis Engineering, London), based on the …Web
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Oily sludge management is a global environmental concern due to its hazardous nature. Oily sludge obtained from a refinery in India had 19–21% oil content. The oil was highly enriched in the asphaltene fraction. Slurry phase biodegradation of this oily sludge in presence of a 3-membered bacterial consortium was optimized in presence of …Web
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Aerobic granular sludge (AGS) is a promising technology for engineering applications in the biological treatment of sewage. New objective is to skip the conventional granulation step to integrate it into a continuous-flow reactor directly. This study proposed a method for integrating spherical pelletizing granular sludge (SPGS) into a new patented …Web
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A large amount of oily sludge is produced during the process of oilfield exploration, refining, gathering, and transportation, and is characterized by high oil content, fine particles, large viscosity, and dehydration and transportation difficulty (Nikkhah et al. 2015; Hassanzadeh et al. 2018; Lashkarbolooki and Ayatollahi 2018).The composition of …Web
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With the development of society and industry, the treatment and disposal of sludge have become a challenge for environmental protection. Co-pyrolysis is considered a sustainable technology to optimize the pyrolysis process and improve the quality and performance of pyrolysis products. Researchers have investigated the sludge co …Web
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The key development of the activated sludge process involved aerating sewage and, instead of disposing of the sludge produced, retaining the sludge for mixing with a fresh batch of raw sewage. Because the retained sludge had been previously oxidized, it was considered to be "activated," and hence was given the name "activated …Web
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As an environmentally friendly energy recovery technology, microwave pyrolysis has huge development potential in sludge resource treatment. This paper comprehensively reviews the progress of microwave pyrolysis of sludge, focusing on the mechanisms and development status of microwave pyrolysis equipment. The effects of …Web
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The process flow diagram (PFD) was developed for paper sludge to ethanol conversion process and was subsequently used to develop a model in Aspen Plus ® to obtain the necessary mass and energy balances for sizing the equipment that is required for SSF process. Process designs were developed for feed rates of 15, 30 and 50 t/d, …Web
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