thermal hydrolysis Articles

  • Thermal hydrolysis as pretreatment of digestion feed

    AbstractA large number of different processes are today on the market for treatment of biodegradable waste. The two principal biological treatment methods available are aerobe treatment (composting) and anaerobe treatment (digestion/fermentation). In Norway so far, aerobe treatment has been the most popular solution. Both windrow composting and tunnel composting systems are in use. The first ...


    By Cambi Group AS

  • 10 years operation experience of thermal hydrolysis projects

    Cambi Milestones 1990 - First development work following research work of Li and Noike 1995 – HIAS Norway – first full scale plant – still working very well after 10 years 1998 - 2002 rapid increase in projects, Naestved, Chertsey, Lillehammer, Borregaard, Fredrecia, Aberdeen, Niigate, Dublin – new challenges and risks to be overcome 2000 - 2005 some problem ...


    By Cambi Group AS

  • Combined experiences of thermal hydrolysis and anaerobic digestion

    The basic principles of batch thermal hydrolysis process (THP) are well known and have been put into full practice in 20 plants around the world. This paper reviews the historical development of the process and the latest thinking on the application of THP from a number of sources in Europe. An independent investigation of the vendors claims support the data for the benefits claimed to date. The ...


    By Cambi Group AS

  • Thermal hydrolysis of secondary scum for control of biological foam

    Outline Extent of Gordona Foaming Problem Scope Cambi Process Methods & Materials Results Cost Comparison Conclusions, Future Concerns Extent of Gordona Foaming Problem Gordona (aka Nocardia) is the predominant organism in 66% of 114 USA treatment plants (Pitt and ...


    By Cambi Group AS

  • Combined Experiences of Thermal Hydrolysis and Anaerobic Digestion

    Historical Perspective of Thermal Hydrolysis First experiments in US 1976 – Haug et al Thermal pre-treatment prior to anaerobic digestion may result in net energy production from the system because of increased biodegradability and reduced digester heating requirements. Recycling of liquid side streams from thermally pre-treated digested sludge should not significantly ...


    By Cambi Group AS

  • Combined experiences of thermal hydrolysis and anaerobic digestion – latest thinking on thermal hydrolysis of secondary sludge only for optimum dewatering and digestion.

    ABSTRACT The basic principles of batch thermal hydrolysis process (THP) are well known as a pre-treatment to anaerobic digestion (AD) . Early work done in the 70s in the USA and the 80s in Japan demonstrated the optimum time and temperature for thermal hydrolysis being 340 F for 30minutes. These principles have been put into full practice in 20 plants around the world at plants ranging from 5 ...


    By Cambi Group AS

  • Sludge disintegration with thermal hydrolysis – cases from Norway, Denmark, and United Kingdom

    ABSTRACT Sludge disposal in Europe is affected by international trends and legislation, national and local situations, and of course economics. Some important trends are: Safe utilization of organic material and nutrients in the agriculture Sensitivity to energy costs Disinfection, especially by requiring batch heat treatment Restrictions and ...


    By Cambi Group AS

  • Thermal hydrolysis pre-treatment for high solids anaerobic digestion

    The City and County of San Francisco completed a two-year pilot study of pre-treatment processes to mesophilic anaerobic digestion for improved biosolids stabilization and production of biosolids suitable for unrestricted reuse (class A biosolids). The results of this effort will help in the design of the new Solids Handling Facility (SHF) at the 11 m3/s Southeast Water Pollution Control Plant ...


    By Cambi Group AS

  • Comparison of centrifuge and belt press for compressible digested sludge after thermal hydrolysis

    Abstract Historically it has been shown on many projects that centrifuges can outperform belt presses in dewatering digested sludge. However, results from a number of projects where sludege has been treated before digestion with Cambi thermal hydrolysis process (THP) hase shown good results for belt press dewatering - generally greater than 30% DS. The authors propose that the main mechanism in ...


    By Cambi Group AS

  • Lab-scaled digestibility study of wastewater sludge treated by thermal hydrolysis

    ABSTRACT High-solids mesophilic anaerobic digestion (HS-MAD) processes employing thermal hydrolytic pretreatment (THP) have gained much interest in recent years; primarily because they have been shown to produce Class A biosolids in accordance with EPA 503 regulations, but also because they represent an economical approach to the maximization of available anaerobic digester volume. The ...


    By Cambi Group AS

  • Operating experience of Aberdeen CAMBI thermal hydrolysis plant 2002

    Introduction This paper reviews the establishment of a new 50 dry tonne per day biosolids processing facility at a green field site at Nigg Bay, Aberdeen Scotland. Prior to 2001 all sewage had been pumped by long sea outfall into the North Sea. Consequently there was only a minor biosolids operation in the area dealing only with small, rural works. Proposals were sought from a number of ...


    By Cambi Group AS

  • Thermal hydrolysis of waste activated sludge at Hengelo Wastewater Treatment Plant, The Netherlands

    The thermal hydrolysis process (THP) is a sludge treatment technique which affects anaerobic biodegradability, viscosity and dewaterability of waste activated sludge (WAS). In 2011 a THP-pilot plant was operated, connected to laboratory-scale digesters, at the water board Regge en Dinkel and in cooperation with Cambi A.S. and MWH Global. Thermal hydrolysis of WAS resulted in a 62% greater ...


    By IWA Publishing

  • Effects of thermal hydrolysis temperature on physical characteristics of municipal sludge

    Effects of thermal hydrolysis temperature on the physical properties of municipal sludge was further studied by a series of experiments. There was a decrease in bound water content with an increase in hydrolysis temperature, while there was an increase in pH at temperatures below 120 °C, and a decrease at temperatures exceeding 120 °C. An analysis of settleability, centrifugation and vacuum ...


    By IWA Publishing

  • Large scale reality of sewage sludge paseteurisation and thermal hydrolysis

    ABSTRACT Two large scale projects have been successfully brought on line utilising the thermal pretreatment to ensure production of a Class A biosolid product. In Reading (UK), the sludge is pasteurised prior to mesophilic anaerobic digestion while in Dublin (Ireland), the sludge is both pasteurised and hydrolysed prior to digestion. Sludge is pasteurised by holding a batch of sludge at ...


    By Cambi Group AS

  • International applications of the Cambi thermal hydrolysis for sludge and biowaste treatment

    ABSTRACT The sludge disposal in Europe is affected by international trends and legislation as well as national and local situations. Some important trends are: Safe utilization of nutrients Safe utilization of energy Disinfection especially by requiring heat treatment Restrictions and increased costs towards landfill and incineration ...


    By Cambi Group AS

  • Anaerobic digestion and thermal hydrolysis to reduce production of sludge in WWTPs

    Abstract Mesophilic and thermophilic digestion of primary and activated sludge was investigated in lab scale reactors. Mixed primary and activated sludge was digested in one experiment and activated sludge was digested alone in another. The same gas yield, COD and dry solids reduction was obtained with both mesophilic and thermophilic digestion. However, more dissolved COD was found after ...


    By Cambi Group AS

  • Cambi thermal hydrolysis - getting the bugs out of digestion and dewatering

    Summary This paper reviews the research some of the work done over the last twenty years on the thermal pre-treatment of sludge and particularly activated sludge. It is demonstrated that the optimum time temperature for thermal pre-treatment is 170°C for half an hour. Pretreatment at 70°C has little or no effect on digestibility and dewaterability. The practical application of this approach in ...


    By Cambi Group AS

  • Integration of thermal hydrolysis into sludge treatment at cottonvalley WwTW, milton keynes

    The paper is a case study of the construction, commissioning and operation of a new 21,000 tonnes dry solids per annum sludge treatment centre at Anglian Water’s wastewater treatment works at Cottonvalley, Milton Keynes. The construction of the new sludge treatment centre was completed in summer 2008 and is part of Anglian Water’s £95 million AMP5 biosolids programme to provide treatment capacity ...


    By Cambi Group AS

  • Evaluation of non-thermal effects by microwave irradiation in hydrolysis of waste-activated sludge

    The activation energy (Ea) for waste-activated sludge (WAS) hydrolysis was compared between microwave irradiation (MW) and conventional heating (CH) methods to evaluate the non-thermal effect of MW. The microwave-assisted hydrolysis of WAS was assumed to follow the first-order kinetics on the basis of volatile suspended solids (VSS) conversion to soluble chemical oxygen demand ...


    By IWA Publishing

  • The Cambi Thermal Hydrolysis Process (THP) – dramatically improving sludge digestion and dewatering

    CAMBI MILESTONES 1990 - First development work following research work of Li and Noike 1995 – HIAS Norway – first full scale plant – still working very well after 11 years 1998 - 2002 rapid increase in projects, Denmark, England, Norway, Scotland, Japan, Ireland – new challenges and risks to be overcome 2000 - 2005 some problem solving ...


    By Cambi Group AS

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