Enzymatic Waste Sanitization at Moderate Temperatures
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Solution Overview
Problem
Current methods for processing municipal solid waste (MSW) are inefficient in utilizing the energy potential of organic materials and often require high temperatures for sanitization, which is energy-intensive and not always necessary, particularly in reducing pathogenic bacteria like E. coli and Enterobacteriaceae.
Innovation Solution
A method involving enzymatic and microbial treatment of MSW in a bioreactor at a pH between 3.0 and 6.0 and a temperature of 40° C. to 60° C. for 10 to 30 hours, which effectively reduces bacterial counts without the need for pre-heating, allowing for the production of bioliquid and non-biodegradable separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-heating waste to high temperatures (90-95°C) is performed before enzymatic treatment, then pathogenic bacteria are effectively killed and waste is sanitized, but energy consumption increases significantly
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperatures (90-95°C) to a lower range (45-75°C) while extending the treatment time to 212 hours or more. This parameter substitution allows effective pathogen deactivation through prolonged exposure to moderate temperatures combined with enzymatic action, significantly reducing the energy input required for heating while maintaining sanitization effectiveness.
Solution Approach 2:
The patent applies preliminary enzymatic treatment to the waste before or during the thermal process. Enzymes are added to break down organic matter and create conditions less favorable for pathogen survival, which prepares the waste matrix in advance to enhance the sanitization effect at lower temperatures and reduce the energy burden of subsequent thermal processing.
2Use of energy by moving object
If enzymatic and microbial treatment is performed at lower temperatures (40-60°C) for shorter periods (10-30 hours), then energy consumption is reduced and processing time is shortened, but bacterial count reduction effectiveness may be compromised
Solution Approach 1:
The patent introduces enzymes as intermediary agents that facilitate bacterial count reduction at lower temperatures. These enzymes break down cell walls and organic matter, creating conditions that enhance the effectiveness of moderate temperature treatment. The enzymes act as mediators between the thermal process and the bacterial cells, enabling effective sanitization at 40-60°C for 10-30 hours without compromising reliability.
Solution Approach 2:
The patent maintains continuous enzymatic and microbial action throughout the 10-30 hour treatment period at 40-60°C. By ensuring continuous exposure to enzymatic degradation and microbial competition, the system achieves progressive bacterial count reduction over time, allowing shorter treatment durations while maintaining effectiveness through uninterrupted action rather than relying on high-temperature shock.
3Productivity
If pre-sorting of waste is performed to separate biodegradable from non-biodegradable material, then the degradation process is simplified and energy efficiency is improved, but the complexity of the overall process increases due to additional sorting steps
Solution Approach 1:
The patent employs a multi-functional enzymatic treatment system that can handle mixed waste streams containing both biodegradable and non-biodegradable materials simultaneously. The enzyme cocktail is designed to selectively degrade organic components while leaving inorganic materials intact, eliminating the need for separate sorting steps. This universal approach maintains degradation efficiency by focusing enzymatic action on biodegradable fractions while automatically excluding non-biodegradable materials from the degradation pathway.
Solution Approach 2:
The patent extracts only the essential function of separation by using enzymes to selectively degrade and separate biodegradable materials from non-biodegradable ones during the treatment process itself. Rather than performing mechanical pre-sorting, the system allows enzymes to naturally target and break down organic matter, effectively extracting and processing the biodegradable fraction in-situ while non-biodegradable materials remain as a separate phase that can be easily removed after treatment.
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 method sanitizes waste at lower temperatures, saving energy and maintaining low bacterial counts in the bioliquid and non-biodegradable materials, thus creating a safer environment and reducing the need for high-temperature processing.
Implementation Method 1
enzymatic treatment in a bioreactor at a pH between 3.0 and 6.0 and at a temperature of between 40° C. and 60° C. for a period of 10 to 30 hours
Implementation Method 2
enzymatic and microbial treatment of MSW in a bioreactor
Implementation Method 3
The review article 'Is anaerobic digestion a reliable barrier for deactivation of pathogens in bio-sludge?' aims to provide a critical overview regarding the deactivation of sludge-associated pathogens by AD
Data Source
AI summary
The present invention relates to a method for sanitizing waste, where waste having specific bacterial counts are subjected to an enzyme composition at a pH between 30 and 6.0 and at a temperature of between 40° C. and 60° C., the liquid is separated and the waste is subjected to the enzyme composition for a period of 10 to 30 hours to obtain at least partial reduction in bacterial count.