digestate Articles
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Floating Cover-China - Case Study
" We have Thermophilic digested biological sludge, digested at 55 degrees. This is done in the digester, from which the sludge is fed to a open storage tank. Subsequently the sludge is dewatered, and the water from the dewatering is led to an "Anita Mox' process. This process should preferably stay above 18" degrees, so it is important that the temperature does not drop too low in the storage ...
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Extracellular polymeric substances and dewaterability of waste activated sludge during anaerobic digestion
Anaerobic digestion of waste activated sludge was conducted to gain insight into the mechanisms underlying change in sludge dewaterability during its anaerobic digestion. Unexpectedly, the results indicated that sludge dewatering properties measured by capillary suction time only deteriorated after 10 days of anaerobic digestion, after which dewaterability recovered and remained stable. The ...
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Effect of the addition of rice straw on microbial community in a sewage sludge digester
Rice straw was added to a sewage sludge digester and its effects on methane production, dewatering characteristics, and microbial communities in the digested sludge were examined by a continuous digestion experiment under mesophilic conditions (35 °C). Stable gas generation was monitored in all digestion experiments. Methane yield from raw sludge, chopped rice straw and softened rice ...
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Dublin - Ringsend - Case Study
Client: Celtic Anglian Water Solution: CambiTHP - B12 Ringsend The WWTP at Ringsend Dublin was originally operating a two train drum drying systems for drying the raw primary sludge to meet the requirements of pasteurisation in Ireland. The plant was extended by the addition of SBR biological treatment reactors to the existing primary treatment plant. Therefore the quantity of sludge was ...
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Microwave and its combined processes: an effective way for enhancing anaerobic digestion and dewaterability of sewage sludge?
The enhancement for sludge anaerobic digestion and dewaterability were investigated in sludge pretreated by microwave (MW) and its combined processes. The results showed that microwave and its combined processes can efficiently release soluble organic matter and thus enhance anaerobic digestion of sludge. The cumulative methane production in the test of the MW-H2O2-OH (0.2) process was ...
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The impact of advanced digestion on incineration of sewage sludge
Abstract Traditionally, when incineratin sewage sludge, it was preferable to burn raw undlgested sludge, as digestion - by extracting some of the energy from sludge- subsequently reduce its calorific value. However, when considering incineration as part of a wider strategy, the desicion whether or not to include digestion becomes less clear. Since, virtually all of the requirements of ...
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The effect of iron and aluminium for phosphorus removal on anaerobic digestion and organic sulfur generation
The addition of iron or aluminium into activated sludge basins for phosphorus removal is likely to impact both the efficiency of the anaerobic digestion process and the generation of odor-causing compounds following digestion and dewatering. In this study, the impact of iron and aluminium addition on digestion and odor-causing compounds was investigated by using batch digestion of combined ...
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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 ...
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Combined experiences of thermal hydrolysis and anaerobic digestion latest thinking on hydrolyis of secondary sludge only
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 ...
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Enhanced stabilisation of sewage sludge through thermal hydrolysis – three years of experience with full scale plant
ABSTRACT The first full-scale plant for sludge disintegration through Cambi thermal hydrolysis was started up in Hamar, Norway at the end of 1995. It is the first plant with a new design where sludge is directly heated by live steam. During the last 3 years the plant worked with an availability of over 99 %. Prior to hydrolysis the sludge is dewatered and the digester is fed with 10-12 % DS, ...
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Beijing - Gao Bei Dian Water Reclamation Plant - Case Study
Client: Beijing Drainage Group Solution: CambiTHP - B12 On 1st September 2014, Cambi was awarded the initial Beijing project, Gao Bei Dian, from Beijing Drainage Construction Company, a flagship for large-scale sludge projects with Cambi Thermal Hydrolysis Process (Cambi THP). The project finished in December 2016. The full sludge amount 99,100 tDS/y be treated in Cambi THP with subsequent ...
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Advanced anaerobic processes to enhance waste activated sludge stabilization
The requirement for enhanced stabilization processes to obtain a more stable, pathogen-free sludge for agricultural use is an increasing challenge to comply with in the waste hierarchy. With this in mind, the Routes European project (‘Novel processing routes for effective sewage sludge management’) is addressed to assess innovative solutions with the aim of maximizing sludge ...
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A comparative perspective of US and UK thinking on e-coli reactivation in digestion and dewatering
Since 2003 a number of WWTPs have observed elevation of E Coli densities following dewatering of digested sludge by high solids centrifuges, mainly in the US. A recent study by WERF shows that this applies to 4 out of 7 facilities studied in detail. A review of all the literature shows that the phenomenon occurs in 31 out of 33 facilities and includes those with thermophilic digestion or ...
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Effect of digester F/M ratio on gas production and sludge minimization of ultrasonically treated sludge
Sludge pretreatment by mechanical, chemical or thermal methods before anaerobic digestion has been applied to increase the digestability of excess sludge. Pretreatment processes rely on their ability to disrupt cell membranes and to release organic materials from the cells into the aqueous phase. Pretreatment by mechanical disintegration has grown rapidly in recent years in parallel with the ...
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CORK, Ireland: INNODRY 2E®–Complete sludge treatment solution including dewatering, drying and granulate storage
Cork WWP (Ireland) was designed in 2000. The specifications did require a complete sludge treatment solution including dewatering, drying and granulate storage. The system was to take maximum advantage of the biogas produced by digesters as well as any surplus heat used for the heating of the digesters. The drying equipment had to be flexible in order to cover the varying production rates and, at ...
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The energy factory - producing energy, nutrients and clean water from sewage water
Conventional sewage treatment: Sludge line: 20 kg DM IE year to sludge; 1.500.000 tons sludge per year Sludge treatment and disposal: 40% of STP opex average cost € 330 / ton sludge (incl. dewatering and processing costs) Traditional (mesophilic ) sludge digestion: Prim. sludge / sec. sludge = 50 : 50 Hydraulic Retention Time 20 days Average yield: 25 – 40% ...
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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 Chertsey, UK – fragmented engineering, new risks and ...
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Struvite Removal & Vivianite Removal Case Study- Heat Exchanger and Screw Press
A regional wastewater treatment plant in Sonoma County was experiencing problems with struvite on their screw presses and vivianite on their heat exchangers.The plant maintenance staff was forced to shut down the dewatering process every three (3) weeks to clean because of struvite deposits on the screen of the screw press. They also noticed that they were having a difficult time maintaining the ...
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Use of Waste-to-Energy Sludge Growing in Europe
This byproduct of anaerobic digestion is fertilizing fields and helping divert waste from landfills Anaerobic digestion (AD) is an important waste-to-energy technology that harvests energy — in the form of biogas — from organic pollutants in wastewater and solid waste. Anaerobic digestion is ideal for challenging wastewater streams that might cause significant public health risk if ...
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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 ...
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