Respected Researcher,
I want to know about the personal experiences of those who are dealing with Anaerobic Digestion with a focus on "Biogas production".
1: How can we increase the Biogas production from the anaerobic membrane Bioreactors having "Synthetic Wastewater" as feed. The initial COD conc. of the Synthetic Wastewater is around 200 mg/L.
2: What could be a few possible factors overcoming/decreasing Biogas production from those AnMBRs?
Any examples, personal experiences, detailed descriptions/opinions are mostly welcome.
Best,
S.S.A. Shah
Hi,
We are working with AnMBRs since 2010. I have few questions for clarification.
Basically COD of WW is quite low for anaerobic process and it is synthetic.
What are the main components of synthetic WW? (it is glucose based? or another organic source?).
What is the OLR (organic loading rate)?
MLVSS?
have you measured VFF? if so what are the vales?
how long you are operating the reactor? (acclamation duration).
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Sludge digestion is carried out in the absence of free oxygen by anaerobic organisms. It is, therefore, anaerobic decomposition. The solid matter in raw sludge is about 70 percent organic and 30 percent inorganic or mineral. Much of the water in wastewater sludge is "bound" water which will not separate from the sludge solids. The facultative and anaerobic organisms break down the complex molecular structure of these solids setting free the "bound" water and obtaining oxygen and food for their growth. Anaerobic digestion involves many complex biochemical reactions and is dependent on many interrelated physical and chemical factors. For purposes of simplification, the anaerobic degradation of domestic sludges occurs in two steps. In the first step, acid forming bacteria attack the soluble or dissolved solids, such as the sugars. From these reactions organic acids, at times up to several thousand ppm, and gases, such as carbon dioxide and hydrogen sulfide are formed. This is known as the stage of acid fermentation and proceeds rapidly. It is followed by a period of acid digestion in which the organic acids and nitrogenous compounds are attacked and liquefied at a much slower rate. In the second stage of digestion, known as the period of intensive digestion, stabilization and gasification, the more resistant nitrogenous materials, such as the proteins, aminoacids and others, are attacked. The pH value must be maintained from 6.8 to 7.4. Large volumes of gases with a 65 or higher percentage of methane are produced. Methane is an odorless, highly inflammable gas which can be used as a fuel. The organisms which convert organic acids to methane and carbon dioxide gases are called methane formers. The solids remaining are relatively stable or only slowly putrescible, can be disposed of without creating objectionable conditions and have value in agriculture.
Microbial environmental conditions also played the most important role in the production of biogas and the chemical oxygen demand (COD) removal, but adverse effects of volatile fatty acids formation were reported as the main inhibitory effect. Food to microorganism F/M ratio interaction, sufficient biofilm within the reactor for microbial attachment was recommended. For the purpose of energy savings and meeting water quality discharge limit, the use of micro filtration was also proposed.To increase the production of biogas from sludge and other organic solid wastes using low cost iron oxide biocompatible nanoparticles (FeNPs) and the simultaneous production of high quality sanitized compost.Anaerobic membrane bioreactors (AnMBRs) combine the advantages of anaerobic treatment with membrane separation, making it an attractive approach for the treatment of a broad spectrum of wastewaters.Due to their high operation stability, AnMBRs are suitable for treating wastewaters under extreme conditions, including high salinity, and high suspended solids content or poor biomass granulation.
Hi Prem - please reach out to me at [email protected] and I can advise you from my experience doing projects with organics and food waste. Joe
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