PHA Production from Pulp Waste via Calcium Treatment

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Solution Overview

Problem

The high cost of raw materials for polyhydroxyalkanoates (PHA) production limits the economic feasibility of biopolymer production, necessitating the development of efficient fermentation processes using inexpensive carbon sources from waste materials.

Innovation Solution

A process involving the use of a waste stream comprising lignocellulosic materials, treated with a calcium-containing mineral and heat-treated to sterilize the stream, which is then used as a carbon source for fermenting PHA-producing microorganisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If expensive raw materials are used for PHA production, then production quality and consistency are improved, but production cost increases significantly

Engineering Contradiction:

Improveproduction quality consistencyVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical and physical parameters of the waste stream through heat treatment (sterilization at elevated temperatures) and calcium mineral addition, transforming it from an unsuitable raw material into an effective carbon source for PHA production, thereby enabling cost-effective manufacturing without sacrificing production quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes inexpensive waste materials (pulp and paper waste streams) as the carbon source for PHA production, replacing expensive traditional raw materials. The waste stream serves as a disposable, low-cost input that can be continuously replenished, significantly reducing production costs while maintaining reliable PHA output

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Ease of manufacture

If waste materials are used as carbon source, then production cost is reduced, but nutrient availability and microbial community stability deteriorate

Engineering Contradiction:

Improveproduction costVSAvoidmicrobial community stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent performs preliminary heat treatment and calcium mineral addition to the waste stream before fermentation, pre-processing the material to enhance nutrient availability and stabilize the microbial community. This preliminary action ensures that when the waste stream is used as carbon source, it provides consistent nutrients and maintains microbial stability, thereby reducing production costs without compromising reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces calcium-containing minerals as an intermediary substance that mediates between the waste stream and the microorganisms. The calcium minerals improve the compatibility of the waste stream with microbial communities, enhancing nutrient availability and stabilizing the microbial population, thus enabling cost-effective production while maintaining microbial stability

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If heat treatment is applied to sterilize waste stream, then microbial contamination is eliminated, but energy consumption and processing time increase

Engineering Contradiction:

Improvesterilization effectivenessVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent performs heat treatment as a preliminary action before fermentation to sterilize the waste stream. By conducting the sterilization step in advance, the system ensures microbial contamination is eliminated without needing to apply excessive energy during the subsequent fermentation process, thereby achieving effective sterilization with optimized energy consumption

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent optimizes the heat treatment parameters (temperature, time) to achieve effective sterilization with minimal energy input. By carefully controlling these parameters, the system eliminates microbial contamination while minimizing the energy and time required for processing, balancing reliability and energy consumption

Inventive Principle:

Principle #35Parameter changes

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 effectively reduces production costs by utilizing inexpensive waste materials, enhances nutrient availability for microorganisms, and improves the reproducibility of PHA production by stabilizing microbial communities.

Implementation Method 1

adding a calcium-containing mineral to the waste stream

Methodology Applied

Scientific EffectCalcium mineral addition:

Implementation Method 2

heat-treating the waste stream in the presence of the calcium-containing mineral, to sterilize the waste stream

Methodology Applied

Scientific EffectHeat treatment: Heat Treatment

Implementation Method 3

fermenting at least one strain of PHA-producing microorganism in a culture medium comprising the treated waste stream as a carbon source, to produce the PHA

Methodology Applied

Scientific EffectFermentation: Fermentation

Implementation Method 4

extracting the PHA from the PHA-producing microorganism

Methodology Applied

Scientific EffectExtraction:

Data Source

PatentUS20250115707A1Production of polyhydroxyalcanoates from pulp and paper waste streams

Publication Date: 2025.04.10 INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE

AI summary

A process for producing polyhydroxyalkanoates (PHA) is provided. The process comprises: providing a waste stream comprising lignocellulosic materials; adding an calcium-containing mineral to the waste stream; heat-treating the waste stream in the presence of the calcium-containing mineral, to obtain a treated waste stream; fermenting at least one strain of PHA-producing microorganism in a culture medium comprising the treated waste stream as a carbon source, to produce the PHA; and extracting the PHA from the PHA-producing microorganism.