anaerobic wastewater treatment plant Articles
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Scaling-up of a zero valent iron packed anaerobic reactor for textile dye wastewater treatment: a potential technology for on-site upgrading and rebuilding of traditional anaerobic wastewater treatment plant
Anaerobic digestion (AD) is a cost-effective technology for the treatment of textile dye wastewater with clear environmental benefits. However, the need to improve process feasibility of high treatment efficiency as well as to shorten hydraulic retention time has raised interest on several intensification techniques. Zero valent iron (ZVI) packed anaerobic digesters have the potential to ...
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Comparison of different conditions, substrates and operation modes by dynamic simulation of a full-scale anaerobic SBR plant
Simulation studies for a full-scale anaerobic unit of a wastewater treatment plant (WWTP) were performed using the anaerobic digestion model no. 1 (ADM1). The anaerobic full-scale plant consists of one mesophilic and one thermophilic digester, operated in an anaerobic sequential batch reactor (ASBR) mode, and sludge enrichment reactors (SER) for each digester. The digesters are fed with a mixture ...
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Waste water treatment lagoon - Case study
Application Waste Water Treatment Lagoon – Michigan Village Lagoons had not been Cleaned in 35 Years Estimated 3,000,000 Gallons of Anaerobic Sludge Material Anaerobically Digested WWTP Sludge 2 – 6% Solids Problems Sludge build up in the Primary Lagoon was transferring to the polishing lagoon and threatened to cause noncompliant discharges and DEQ fines Residents ...
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Conversion of sewage sludge to commodity chemicals via syngas fermentation
Gasification of sewage sludge allows the recovery of energy, and produces a mix of CO, CO2 and H2 called synthesis gas (or syngas), which can be fermented by acetogenic bacteria to added-value products. This work presents the conversion of syngas to organic acids and alcohols using both pure and mixed cultures. Pure culture kinetic experiments with Clostridium carboxidivorans P7 resulted in the ...
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Enhancement of struvite pellets crystallization in a full-scale plant using an industrial grade magnesium product
A full-scale struvite crystallization system was operated for the treatment of the centrate obtained from the sludge anaerobic digester in a municipal wastewater treatment plant. Additionally, the feasibility of an industrial grade Mg(OH)2 as a cheap magnesium and alkali source was also investigated. The struvite crystallization plant was operated for two different periods: period I, in which ...
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The effect of different mesophilic temperatures during anaerobic digestion of sludge on the overall performance of a WWTP in Sweden
This project was initiated to evaluate the effect of alternative process temperatures to 38 °C at the anaerobic digestion step in a Swedish wastewater treatment plant (WWTP) treating mixed sludge. The efficiency of the different temperatures was evaluated with respect to biogas production, volume of sludge produced and nutrient content in the reject water to find the optimum temperature for ...
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Co-digestion of press liquids of source-sorted municipal organic waste in anaerobic sludge treatment of municipal wastewater treatment plants
This paper describes a semi-continuous laboratory-scale investigation of a potential co-substrate for mesophilic anaerobic sludge digestion in a municipal wastewater treatment plant. A feed liquid produced from source-sorted municipal organic waste by pretreatment with a screw press was subjected to the investigation. Quantities produced in press trials as well as the composition of the feed ...
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Technical and economic analysis of real anaerobic digester centrate by means of partial nitrification and sustainable heterotrophic denitrification
The reliability of partial nitrification coupled with heterotrophic denitrification for the treatment of real anaerobic digester centrate produced in a wastewater treatment plant was technically and economically assessed in two sequencing batch reactors. Removal efficiencies above 90% were consistently achieved at N-ammonium loads above 1.2 g N L−1 d−1. Ethanol, affluent ...
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Life cycle assessment of introducing an anaerobic digester in a municipal wastewater treatment plant in Spain
Anaerobic digestion (AD) is being established as a standard technology to recover some of the energy contained in the sludge in wastewater treatment plants (WWTPs) as biogas, allowing an economy in electricity and heating and a decrease in climate gas emission. The purpose of this study was to quantify the contributions to the total environmental impact of the plant using life cycle ...
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Increasing the sludge energy potential of wastewater treatment plants by introducing fine mesh sieves for primary treatment
The objective of this study was to compare some basic characteristics of sludge from fine mesh sieves (sieve sludge) with sludge from primary clarifiers (primary sludge) regarding their energy potential with a focus on anaerobic digestion and/or incineration. Nineteen samples of sludge from fine mesh sieve plants (most of them without fine screens and grit chambers as pre-treatment) and 10 ...
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Biological nitrate removal using waste-derived extracts as sole carbon source
Waste-derived multicomponent extracts were investigated as carbon source for biological nitrate removal. Aerobic and anaerobic sludge from a municipal wastewater treatment plant and leachate from an anaerobic digester treating food waste were studied. Alkaline-heat treatment was used for sludge solubilisation. More than 90% carbon was recovered at pH 10–11. The extracts contain very high ...
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A full service, stress free package of benefits - Case Study
Handing over every aspect of wastewater plant management to the experts is a particularly interesting proposition for dairies where changes in production are an everyday occurrence. It makes managing both the plant and personnel easier. It also has other positive results, such as reducing electricity bills, as was the case for an EnviroChemie client. A wastewater plant is, in some respects, ...
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The effect of mixing conditions on anaerobic digester performance
The basic principle of aerobic wastewater treatment is the conversion of some parts of organic matters to biomass and this causes production of excessive sludge in aerobic processes. This excessive sludge is withdrawn from time to time to prevent accumulation of biomass in aeration basin. In most cases, this sludge requires the stabilization before the dewatering and disposal. Different processes ...
By ORBIT e.V.
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Effects of influent fractionation, kinetics, stoichiometry and mass transfer on CH4, H2 and CO2 production for (plant-wide) modeling of anaerobic digesters
This paper examines the importance of influent fractionation, kinetic, stoichiometric and mass transfer parameter uncertainties when modeling biogas production in wastewater treatment plants. The anaerobic digestion model no. 1 implemented in the plant-wide context provided by the benchmark simulation model no. 2 is used to quantify the generation of CH4, H2 and CO2. A comprehensive global ...
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Wastewater treatment: how to prevent sludge settling in digesters
In municipal wastewater treatment plants, where large quantities of wastewater are treated and purified every day, anaerobic digestion is a key process for the sustainable reuse of stabilised sludge and its valorisation for energy purposes. In fact, anaerobic sludge digestion helps large wastewater treatment plants to: Stabilise the sludge and further reduce the pollutant load Valorise the ...
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