digestate ammonia Articles
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Mathematical models and bacterial communities for ammonia toxicity in mesophilic anaerobes not acclimated to high concentrations of ammonia
In this study, we evaluated ammonia toxicity in mesophilic anaerobic digestion at various pH values and total ammonia nitrogen (TAN) concentrations. We performed anaerobic toxicity assays (ATAs) to evaluate the toxicity effects of TAN and pH on mesophilic anaerobic digestion. Modeling based on the results of the ATAs indicated that the specific methanogenic activity (SMA) decreased by 30% at ...
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Sanitising black water by auto-thermal aerobic digestion (ATAD) combined with ammonia treatment
The effect of a two-step process on the concentration of pathogens and indicator microorganisms in black water (0.9–1% total solids) was studied. The treatment combined auto-thermal aerobic digestion (ATAD) and ammonia sanitisation. First, the temperature of the black water was increased through ATAD and when a targeted temperature was reached (33, 41 and 45.5 °C studied), urea was added to a ...
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Digestion of wastewater pond microalgae and potential inhibition by alum and ammoniacal-N
Algae are produced in considerable quantities in oxidation ponds, and may negatively affect receiving waters when discharged at high concentration. Thus in some instances they require removal prior to effluent discharge, which may be enhanced using flocculants such as alum. Harvested algal biomass could be anaerobically digested to methane for use as a renewable energy source, however, alum, has ...
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Waste Water Treatment Processes Explained
SUNCOAST WASTE WATER MANAGEMENT presents AEROBIC -verses- ANAEROBIC THE AEROBIC PROCESS There are two basic types of sewerage treatment processes, which are the Aerobic process and the Anaerobic process. Aerobic means with air or oxygen and Anaerobic (septic) means without air or oxygen. Aerobic bacteria are a higher life form and when digesting waste are utilising dissolved oxygen or air ...
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Methods of ammonia removal in anaerobic digestion: a review
The anaerobic digestion of substrates with high ammonia content has always been a bottleneck in the methanisation process of biomasses. Since microbial communities in anaerobic digesters are sensitive to free ammonia at certain conditions, the digestion of nitrogen-rich substrates such as livestock wastes may result in inhibition/toxicity eventually leading to process failures, unless ...
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Analysis and optimization of ammonia stripping using multi-fluid model
Ammonia recovery from anaerobic digestion (AD) is a notably beneficial process for removing excess nitrogen, producing low cost fertilizer and enhancing odor abatement. A process was developed for nutrients recovery by integrating a simple and effective stripping process with AD system. To design, optimize and scale up this system, multi-fluid model was developed to simulate flow, mass transfer ...
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Stripping Ammonia in Anaerobic Digesters
GIVEN its high population density, coupled with the demanding environmental standards enforced by the Environmental Protection Department, it is not surprising that Hong Kong served as the incubator for our process to remove ammonia from wastewater. What has resulted is a novel thermal ammonia stripping technology, which has low operating costs, high standards, and a small footprint. Since 1997, ...
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V-Bank Transition (VTS) - Robert O. Pickard Environmental Centre, Ottawa, Canada - Case Study
THE PROBLEM: The RobertO. Pickard Environmental Centre (ROPEC) in Ottawa, Canada was undergoing needed upgrades and expansions to its thickening and dewatering building. This building plays a vital role by in water treatment providing sewage receiving and pumping, sludge mixing and thickening, as well as dewatering digested biosolids. These processes release H2S, Ammonia, and other VOC's into ...
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Nitrification of centrate from dewatering of anaerobically digested sludge
Nitrification of anaerobically digested sludge centrate was studied in bench-scale suspended growth and fixed film enhanced suspended growth systems at temperatures of 10.5-28.5°C and pH values of 6.0-9.1. Nitrification followed zero-order kinetics in both systems, and ammonia removals in excess of 99% were observed. The temperature dependency of the suspended growth nitrification rate ...
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Wastewater Plant Stays in Control with Nutrient Analysis System
Overview Denver uses ChemScan analyzers to monitor its centrate and RAS reaeration basin (CaRRB) process, ensuring nitrate and ammonia are reduced before mainstream aeration. Challenge The Denver Metro Wastewater Reclamation District wanted near real-time nutrient analysis for a very challenging headworks wastewater aeration process. This process consists of a combination of centrate and ...
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Nutrient analysis system keeps wastewater plant in control - Case Study
Problem The Denver, Colo., Metro Wastewater Reclamation District wanted near real-time nutrient analysis for a very challenging headworks wastewater aeration process, consisting of a combination of centrate and RAS. The centrate and RAS reaeration basin (CaRRB) effluent is added to primary effluent prior to mainstream aeration. Solution ASA Analytics supplied a centralized nutrient analysis ...
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Project - Valorgas
AeroThermal has made a major contribution to a study examining the effectiveness of various pre-treatments to enhance the bio-methane yield from food waste. Our contribution was to examine the effect of autoclaving on the digestibility of food waste. The studies, which were partially funded by the EU, included small scale tests in Finland on material processed in our pilot scale autoclave in ...
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Electrochemically-assisted ammonia recovery from wastewater using a floating electrode
This work presents and explores a novel methodology for the removal and recovery of ammonia from wastewater based upon two mechanisms: electrochemical oxidation and a previously unreported electrochemically-assisted surface transfer mechanism. Recovery of ammonia is enabled by placing a porous cathodic electrode at the wastewater-air interface. In this configuration, the cathode creates local ...
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The effects of different aeration modes on ammonia removal from sludge digester liquors in the nitritation–anammox process
The aim of this study was to determine the impact of continuous and intermittent aeration on the rate of ammonia removal in the combined nitritation–anammox process. This process was run in two parallel sequencing batch reactors (SBRs), with a working volume V = 10 L, treating sludge digester liquors from the Gdansk (Poland) wastewater treatment plant (WWTP). The ammonia oxidizing ...
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Improved plant discharge Quality using the IDEAL system
Miner, Mo., population 980, is a quaint rural community located halfway between St. Louis and Memphis, Tenn. The 20-year-old Miner Wastewater Treatment Plant faced a number of technical issues in 2012. The town’s old three-cell 0.302 MGD aerated lagoon had high levels of suspended solids. Its ammonia and nitrogen concentrations were above their targets. “There was quite a bit wrong ...
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Becoming A “Water Resource Recovery Facility” Offers Financial Benefit
While the term “Water Resource Recovery Facility” may seem like nothing more than a trendy phrase, the name change represents a distinct shift in the role that wastewater utilities can now play. Wastewater is packed full of resources — nutrients, micronutrients, metals, grit, biopolymers, biosolids, and more — and much of that can be recovered and sold, offering ...
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Bioremediation of soil
In our experience, Bioremediation is best accomplished with Bio-augmentation, the addition of large numbers of selected micro-organisms grown in the production laboratory. In addition to bio-augmentation, several physical and chemical parameters must be controlled in order to obtain optimal growth and maximum degradation of soil contaminants. The major factors that are controlled during ...
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