Feb 7, 2024 · From waste to resource: New sustainable process transforms sewage sludge into activated carbon. Credit: Journal of Environmental Management (2023). DOI: 10.1016/j.jenvman.2023.119822. Sewage sludge is the solid waste resulting from wastewater treatment. According to data from the Ministry for the Ecological Transition and the Demographic
Jan 1, 2023 · Aerobic composting was found to be an effective way to degrade triclosan in sewage sludge, as it effectively degraded and inactivated triclosan during the thermophilic phase, thus ensuring the stability and safety of the composting products.
The co-composting of sewage sludge, green waste, and food waste even at a low C/N ratio of 8.75, 18.00, and 24.90 resulted in high-quality composts. The research results can contribute to the
(2021) López-González et al. Frontiers in Microbiology. Wastewater treatment generates a huge amount of sewage sludge, which is a source of environmental pollution. Among the alternatives for the management of this waste, industrial composting stands out as one of the most relevant. The objective
Mar 1, 2019 · To our knowledge, this is the first study where the effect of the composting residence time over the emission factors of NH 3 and tVOCs is evaluated, providing the emission factors for a full-scale sewage sludge composting plant and allowing a comparison among similar treatment processes with different input wastes (raw sludge, municipal solid
Jul 24, 2020 · The objective of the study was to characterise co-composting dynamics and maturity of the end products of sewage sludge/ green waste mixtures. We analysed all initial substrates and co-composts, sampled at different composting times for studying (1) physicochemical parameters and (2) organic matter biodegradation and biotransformation using pyrolysis coupled to gas chromatography and mass
Aug 30, 2023 · Complementary characteristics of rice straw (RS) and sewage sludge (SS) create a suitable mixture to be used in a composting process. This work studies industrial-scale RS and SS composting to assess both its viability and optimization. Windrow composting was conducted during two seasons.
Oct 27, 2015 · In order to use sewage sludge (SS) composts in agriculture, it is extremely important to estimate the quality of compost products. The aim of this study was to investigate the quality of composted SS as a fertilizer and soil amendment especially in semi-arid areas. To determine the quality and agronomic value of the SS compost products, analyses on pH, electrical conductivity, organic matter
Thermal sludge treatment – a short cut to cost saving, heat recovery, Class A compost and biogas. Pre-heating of wastewater sludge using Alfa Laval spiral heat exchangers and tube-in-tube heat exchangers prior to dewatering can also cut costs and provide an opportunity for heat recovery. Our thermal equipment can also be used for sludge
Several processes are used: air drying on sand beds. centrifugation. belt pressing (filtration) Increases solids content to 15 to 30%. Air drying reduces pathogens. Centrifugation and filtration result in some loss of nutrients. Anaerobic digestion. One of the most widely used for sludge treatment.
May 5, 2015 · Introduction. Composted organic waste from households, businesses, yards and parks, food processing and agricultural waste, as well as sewage sludge from municipal sewage treatment plants contains a host of valuable plant nutrients. Rich in nitrogen, phosphorous, potassium and trace elements such as copper and zinc, such compost is used as an
Composting is controlled fermentation that converts organic matter aerobically and produces stable humic and pre-humic compounds (figure 1). Aeration will only be effective if the medium is air-permeable. Dewatered sludge often has a low porosity; a bulking agent has to be added, usually in the form of a carbonaceous support (20% of the mixture
Feb 2, 2018 · The objective of this study was to examine the feasibility of sewage sludge composting using a simple aeration method. Two consecutive composting trials (run A and run B) using Japanese sludge and woodchips (1:1, v/v) were conducted in cubic boxes (0.45 × 0.45 × 0.45 m3) made by plywood at Okayama University. Air was forced up through small holes perforated on two open-ended parallel PVC
Feb 1, 2023 · GA was applied to optimize the process conditions as a metaheuristic search algorithm. The decision variables of the optimization transaction were the ratio of dewatered sewage sludge and the composting duration. Also, the parameters of pH, temperature, EC, C/N, TOC loss, TN loss, NH 4 +-N/NO 3 –-N ratio, and MC loss were optimized. The
Jul 1, 2017 · The low OER, the fast stabilization of the SEFW and the possibility of managing sewage sludge, strawberry extrudate and fish waste that is generated simultaneously in the same local area support the feasibility of composting these wastes in open composting systems.