Compost-Based Microbial Inoculant for Multi-VOC Exhaust Gas Degradation
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Solution Overview
Problem
Current complex microbial inoculants for exhaust gas treatment face challenges such as complex preparation processes, low degradation activity, and limited viable count per unit volume, necessitating a more efficient and effective solution for VOCs degradation.
Innovation Solution
Aerobic composting is combined with microbial inoculant preparation, using Pseudomonas mendocina NX-1, Stenotrophomonas sp. HY-2, Rhodococcus sp. YZ-1, Ralstonia sp. XZW-1, and Pseudomonas oleovorans DT4 strains cultured on kitchen wastes and organic exhaust gases, forming a solid complex microbial inoculant with enhanced VOCs degrading capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional complex microbial inoculants are prepared using conventional methods, then the preparation process becomes complex and time-consuming, but the degradation activity and viable count remain limited
Solution Approach 1:
The patent combines aerobic composting process with microbial inoculant preparation into a single integrated system. The composting pile serves dual purposes: treating organic waste and cultivating the microbial inoculant simultaneously. This merging eliminates separate preparation steps, simplifies the overall process, and enhances degradation activity through in-situ microbial cultivation under optimized composting conditions.
Solution Approach 2:
The composting pile is designed to perform multiple functions: waste treatment, heat generation for sterilization, moisture regulation, and microbial cultivation. The same system that composts organic matter also serves as the bioreactor for developing the microbial inoculant, maximizing resource utilization and process efficiency while maintaining high viable counts.
2Quantity of substance
If conventional microbial inoculant preparation methods are used, then the viable count per unit volume is limited, but the preparation process remains simple
Solution Approach 1:
The patent optimizes key parameters during the composting process to enhance microbial proliferation: maintaining carbon-nitrogen ratio between 25:1 and 35:1, controlling moisture content at 50-60%, and regulating aeration to support aerobic conditions. These parameter adjustments create optimal growth conditions that dramatically increase viable count per unit volume while the composting process itself drives the preparation efficiency.
Solution Approach 2:
The method introduces inoculum strains at the beginning of the composting process, allowing them to establish and multiply during the thermophilic and maturation phases. This preliminary introduction enables the microbes to adapt and proliferate in advance, achieving high viable counts by the time the inoculant is ready for application, thereby improving preparation efficiency.
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
The prepared inoculant effectively degrades n-hexane, pentane, chlorobenzene, and tetrahydrofuran, achieving complete degradation within specific time frames and demonstrating high tolerance to varying contaminant concentrations, while also minimizing waste through a simple and environmentally friendly process.
Implementation Method 1
The principle of biological treatment processes of VOC exhaust gases is to convert gaseous contaminants into innocuous substances, such as CO2, H2O, lowly toxic intermediate products, and cytoplasm under the metabolism of microorganisms
Implementation Method 2
aerobic composting and microbial inoculant preparation are combined, VOCs degrading bacteria are gradually cultured using natural carriers and various nutrient elements provided by a compost pile
Data Source
AI summary
The present disclosure relates to the technical field of biological treatment of exhaust gases, in particular to preparation of a complex microbial inoculant, an apparatus for preparing the complex microbial inoculant and application thereof. The preparation of the complex microbial inoculant is to select kitchen wastes, wood chips and EM fungus chaff as aerobic composting raw materials, and add contaminant degrading bacteria Pseudomonas mendocin NX-1, Stenotrophomonas sp. HY-2, Rhodococcus sp. YZ-1, Ralstonia sp. XZW-1, and Pseudomonas oleovorans DT4 during the aerobic composting process for joint culture until a compost pile becomes thoroughly decomposed. The complex microbial inoculant provided by the present disclosure can simultaneously degrade n-hexane, pentane, chlorobenzene and tetrahydrofuran, and has the remarkable advantages of simple preparation process, low cost, low carbon, environmental friendliness and the like. The formed microbial inoculant that is rich in efficient degrading bacteria does not need to adjust pH, has the advantages of short starting cycle, and stable and efficient exhaust gas purification, has stronger environmental adaptability, and lays a foundation for engineering application of purifying waste water and exhaust gases containing n-hexane, pentane, chlorobenzene and tetrahydrofuran by a biological method.