digestate ammonia Articles

  • 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 ...


    By IWA Publishing

  • Determination of Ammonia and Nitrogen

    Customer: CAE Grand Ouest, France CAE is a laboratory of the Veolia Group located in Western France. The laboratory is specializing in environmental analysis, especially in water and soil analysis. Application: Determination of Ammonia and TKN in waste water and soil Total Kjeldahl Nitrogen (TKN) and Ammonia are common parameters for the evaluation of ...


    By BÜCHI Labortechnik AG

  • 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 ...


    By IWA Publishing

  • 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 ...


    By IWA Publishing

  • High dry solids digestion

    ABSTRACTDigestion of sewage sludge normally takes place at pH values between 7,0 and 7,5. Control methods of the process stability are based on practical experience such as the ratio of volatile fatty acids (VFA) and total alkalinity (TA). Thermal sludge disintegration for an enhanced digestion process allows a digester feed with higher dry solids concentrations. This is due to an opening of ...


    By Cambi Group AS

  • High dry solids digestion

    Abstract Digestion of sewage sludge normally takes place at pH values between 7,0 and 7,5. Control methods of the process stability are based on practical experience such as the ratio of volatile fatty acids (VFA) and total alkalinity (TA). Thermal sludge disintegration for an enhanced digestion process allows a digester feed with higher dry solids concentrations. This is due to an ...


    By Cambi Group AS

  • The economics of advanced digestion

    Abstract Historically, the focus sewage sludge digestion was to stabilise the sludge and reduce the odour emitted. Pathogen reduction, solids destruction and biogas production then became important. In recent years a number of advanced digestion processes have become available which can be added to the conventional digestion process. Initially advanced treatment methods for treating sludge were ...


    By Cambi Group AS

  • TKN/Ammonia in Water & Wastewater by Steam Distillation

    The determination of total Kjeldahl Nitrogen (TKN) in water and waste water is a routine procedure used to ensure water quality. A simple and fast procedure for TKN determination as described in ISO 5663-1984, EPA 351.3, and AOAC 973.48 regulations, is introduced below. The sample is digested with sulfuric acid using the SpeedDigester K-436 or K-439, followed by distillation and titration with ...


    By BÜCHI Labortechnik AG

  • Recovery of ammonium from digestate as fertilizer

    Ammonia inhibition can be a major problem during anaerobic digestion of manure and municipal and industrial sludges. Anaerobic digestion is sensitive to higher NH3-N concentrations, which are inhibiting and at certain levels even toxic for methanogen bacteria. The Nijhuis Ammonium Recovery (AECO-NAR) system can solve this problem and removes ammonium from digestate or other substrate for ...


    By IWA Publishing

  • 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 a ...


    By IWA Publishing

  • Treatment of wastewater from anaerobic digestion

    The Client The customer is power plant which produces biogas from biomass and sewage farm, through anaerobic digestion and thermal recovery, located nearby Munich in Germany. The Client’s needs Biogas is produced by the fermentation of organic substances of animal and vegetal origin in absence of oxygen (anaerobic process). This process produces a ...


    By EVALED-Evaporator

  • 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 ...


    By IWA Publishing

  • 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 ...


    By Inderscience Publishers

  • Computer simulation of control strategies for optimal anaerobic digestion

    Three previously published control strategies for anaerobic digestion were implemented in Simulink/Matlab using Anaerobic Digestion Model No. 1 (ADM1) to model the biological process. The controllers’ performance were then simulated and evaluated based on their responses from five different types of process scenarios i.e. start-up and steady state performance as well as disturbances from ...


    By IWA Publishing

  • 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 ...


    By IWA Publishing

  • Prediction of Strutive Formation Potential in EBPR Digested Sludges

    ABSTRACTLow operating costs and less sludge generation associated with EBPR (Enhanced Biological Phosphorus Removal) have led existing wastewater treatment plants to retrofit their phosphorus removal systems and have encouraged new plants to incorporate EBPR into their design. However, in plants that use anaerobic digestion, the introduction of EBPR may result in the formation of scales of the ...

  • Evaluation of anaerobic digestion processes for short sludge-age waste activated sludge combined with anammox treatment of digestate liquor

    The need to reduce energy input and enhance energy recovery from wastewater is driving renewed interest in high-rate activated sludge treatment (i.e. short hydraulic and solids retention times (HRT and SRT, respectively)). This process generates short SRT activated sludge stream, which should be highly degradable. However, the evaluation of anaerobic digestion of short SRT sludge has been ...


    By IWA Publishing

  • Implications of full-scale implementation of an anammox-based process as post-treatment of a municipal anaerobic sludge digester operated with co-digestion

    The feasibility of treating the supernatant of a municipal sludge digester supplemented with co-substrates by means of an anammox-based process (ELAN®) was tested in Guillarei (NW of Spain). Ammonia concentration measured in the supernatant of the sludge digester varied in the range 800–1,500 g N/m3 due to the fact that the sludge produced in the plant was co-digested with ...


    By IWA Publishing

  • Nitrogen removal from digested manure in a simple one-stage process

    A process based on partial nitrification and recirculation into the anaerobic digester was studied to remove nitrogen from digested manure and thus reduce enhanced gaseous ammonia emissions due to on-farm biogas production. An anaerobic reactor representing an anaerobic manure digester was fed with a nitrite solution and digested manure liquor. Nitrite was efficiently removed from the influent ...


    By IWA Publishing

  • Fate of phosphorus during anaerobic digestion of sludge from an EBPR plant

    As part of their ongoing commitment to produce safe sewage sludge for recycling to agricultural land, Anglian Water are expanding their enhanced sludge treatment operations at four key sites across the Eastern region. The project at Whitlingham STW uses thermal hydrolysis as a pre-treatment to anaerobic digestion as the main sludge treatment process. As well as producing an enhanced treated ...


    By Cambi Group AS

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