Sequential Anaerobic Reactors for Methane Production
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Solution Overview
Problem
Existing biogas production technologies face challenges such as inefficient production due to incomplete digestion of organic waste, short channelling of unprocessed waste, low microbial activity, pH fluctuations, and scum formation in anaerobic digesters, leading to low biogas yield and methane content.
Innovation Solution
A sequential process using multiple reactors with on-site selective enrichment of microbial consortiums to control biochemical functions, reducing hydraulic retention time and minimizing pH fluctuations, which involves preparing organic waste feed, pretreating it, creating a feed slurry, processing it through series of reactors with bioinoculant generation, and removing H2S and CO2 to produce methane-rich biogas with low sulphide content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single large reactor or two parallel bioreactors are used for anaerobic digestion, then the process is simpler to operate, but cross reactions of metabolic reactions, short channelling of partly digested feedstock, and fluctuations in redox balance and pH occur
Solution Approach 1:
The patent divides the anaerobic digestion process into four separate sequential reactors, each dedicated to a specific metabolic step (hydrolysis, acidogenesis, acetogenesis, and methanogenesis). This segmentation prevents cross-reactions between different microbial communities, eliminates short-circuiting of partly digested material, and stabilizes pH and redox conditions in each reactor by isolating the biochemical functions.
2Reliability
If conventional anaerobic digestion is used, then the process is established and proven, but incomplete digestion of organic waste occurs leading to low biogas yield
Solution Approach 1:
By separating the digestion process into four specialized reactors, each microbial community can fully degrade its specific substrates without interference from other metabolic steps. This complete degradation of organic waste maximizes biogas yield while maintaining the reliability of the proven anaerobic digestion technology.
3Reliability
If multiple reactors with on-site selective enrichment are used, then biochemical functions are controlled and microbial populations are stabilized, but the device complexity increases
Solution Approach 1:
The patent uses segmentation to create four functionally distinct reactors that simplify the overall system control. Each reactor handles a specific biochemical transformation with its own optimized microbial community, making the complex biology manageable through functional separation rather than requiring complex control mechanisms.
4Productivity
If sequential four-stage anaerobic digestion is implemented, then complete organic waste degradation occurs, but the hydraulic retention time increases
Solution Approach 1:
The patent optimizes parameters in each reactor (temperature, pH, organic loading rate, hydraulic retention time) to match the specific requirements of each metabolic stage. This parameter optimization ensures that each reactor processes its substrate efficiently at the fastest possible rate, minimizing the cumulative hydraulic retention time while achieving complete degradation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances biogas production efficiency, increases methane content, reduces purification efforts, and stabilizes microbial populations, resulting in higher yields and lower hydraulic retention times while minimizing scum formation and pH fluctuations.
Implementation Method 1
Anaerobic digestion is one of the most prominent technologies being considered in the realm of waste to energy sector. Anaerobic digestion of biodegradable waste includes important metabolic steps, viz., hydrolysis, acidogenesis, acetogenesis, and methanogenesis
Implementation Method 2
The existing technologies use agitation in either large single reactor or two bioreactors operating in parallel mode. Cross reaction of the metabolic reactions, short channelling of the partly digested feedstock, fluctuations in redox balance and pH inside the digester are some major challenges
Implementation Method 3
The present invention relates to a sequential process for maximum biogas production with increased substrate utilization and reduced hydraulic retention time. The on-site enrichment of selective microbe with specified biochemical function and its dosage into the respective digester at regular time intervals confines the biomass conversion to a particular biochemical step
Data Source
AI summary
The present invention relates to an integrated method for methane rich biogas production from anaerobe systems using multiple reactors and various types of on-site selective enriched microbial consortium production. Biomass/organic waste is converted to biogas rich in methane content and minimum or absence of hydrogen sulphide content at reduced hydraulic retention time (HRT). More particularly, the present invention relates to an on-site enrichment of selective microbe with specified biochemical function and its dosage into the respective digester at regular time intervals which improve the biomass conversion through biochemical steps, resulting into maximum production of methane rich biogas in a self-controlled biochemical function inside each bioreactor in a comparatively lesser time intervals.