Solid and Hazardous Waste Management Solutions

Solid Waste Harmless Aerobic Fermentation Disposal Solution

1.  General Provisions of the Plan

· Target materials: Organic solid wastes, primarily including municipal sludge, food waste, livestock and poultry manure, crop straw, and food processing residues, among others.

· Handling principles: Adhere to the environmental protection principles of "reduction, stabilization, harmlessness, and resource utilization."

· Final product: Produced in compliance with national or local standards (e.g., "Organic Fertilizer") NY/T 525-2021 "Sludge Disposal from Municipal Wastewater Treatment Plants: Sludge Quality for Landscape Greening" GB/T 23486-2009 And so on)—stable humus-derived fermentation products, which can be used for soil improvement, landscaping, and organic fertilizer production.

· Core Process: Aerobic Fermentation Aerobic Composting ), which refers to the biochemical process in which natural or inoculated microbial communities decompose organic matter under aerobic conditions, generating high temperatures that effectively eliminate pathogens and weed seeds, ultimately resulting in the formation of a stable, fully composted product.

2.  Process Flow and Instructions

The core process flow for aerobic fermentation treatment can be divided into four main stages:

Phase One: Pre-processing

· Purpose: To adjust the physicochemical properties of the material, creating optimal conditions for subsequent high-efficiency fermentation.

· Main Content:

  1.  Reception and Storage: Install enclosed temporary storage bins to prevent odor diffusion and leachate contamination.

  2.  Sorting: Large debris such as plastics, glass, metals, stones, and other materials are removed through processes like screening, magnetic separation, and air classification, thereby enhancing the purity of the material.

  3.  Broken / Crushing: Reduces material particle size, increases specific surface area, and facilitates rapid microbial decomposition.

  4.  Blending: This is the critical step. By adding conditioners (such as straw, wood chips, rice husks, etc.) and expanders, adjust the carbon-to-nitrogen ratio of the material. C/N ) To 25-35:1 , with moisture content up to 50%-60% , porosity to ensure adequate oxygen transport.

Phase II: Efficient Aerobic Fermentation (Main Process)

· Purpose: To rapidly degrade organic matter under controlled conditions and ensure it meets harmlessness requirements.

· Major technology choices:

· Trough-type turning and fermentation: Materials are placed in long, trough-shaped fermentation tanks, where a rail-mounted turning machine periodically mixes and turns the pile, while forced ventilation ensures adequate oxygen supply. This method offers the advantages of high processing capacity and relatively simple operation.

· Reactor-type fermentation (closed-tank system): The process takes place in a sealed fermentation tank, with oxygen supplied via forced aeration and uniform mixing achieved through mechanical agitation. Advantages include a small footprint, environmental friendliness (odors are easily controlled), high automation, independence from weather conditions, and a short fermentation cycle.

· Process control parameters:

· Temperature: The fermentation temperature should be maintained at 55-65 Above ℃ and lasting at least 5-7 Heaven, to ensure the effective elimination of pathogens and weed seeds.

· Oxygen: Ensure the oxygen concentration in the compost pile is maintained by forced ventilation or turning and mixing. 5% That's all.

· pH Value: Fermentation Process pH Values will naturally change, and the final product typically becomes slightly alkaline.

· Fermentation cycle: Typically ranges depending on the process and technology used, usually 15-30 Heaven.

Phase Three: Post-Processing (Aging and Processing)

· Purpose: To further stabilize the fermentation products and process them into qualified products.

· Main Content:

  1.  Chen Hua (Secondary Fermentation): The material remaining after primary fermentation is still unstable and needs to be allowed to settle and age. 1-4 Zhou, allowing hardly degradable organic matter to continue breaking down, thereby eliminating it. Phytotoxicity (Phytotoxicity), ensuring complete decomposition.

  2.  Screening: Removes impurities (such as small amounts of plastic) or large pieces of conditioner that were not fully broken down during fermentation, resulting in a finely textured product with uniform particle size.

  3.  Additives: Depending on the product application (such as organic fertilizer), specific functional microbial agents or nutrient elements can be added during the granulation process.

Phase Four: Product Utilization and Environmental Pollution Control

· Product utilization: The matured and stable fermentation products can be used as:

· Soil conditioners: Used for saline-alkali lands, desertified areas, mine reclamation, and more.

· Landscaping and Greenery Soil / Substrate: Used for seedling cultivation, urban landscaping, golf courses, and more.

· Organic fertilizer raw materials: Further processed into commercial organic fertilizers, bio-organic fertilizers, and more.

· Environmental Pollution Control (Integrated Throughout the Entire Process):

· Waste gas treatment: Collect odorous gases such as ammonia and hydrogen sulfide generated in the fermentation workshop (especially from reactors), and purify them using processes like biofilters and chemical scrubbing before discharging them in compliance with environmental standards.

· Leachate treatment: Collect leachate generated during the pre-treatment and fermentation processes, and either re-inject it back into the fermentation pile or send it to a wastewater treatment plant for processing.

· Noise Control: Implement soundproofing and noise-reduction measures for high-noise equipment such as fans and grinders.

3.  Technical Advantages and Features

1.  Thorough Harmlessness: The high-temperature process effectively eliminates pathogens, insect eggs, and weed seeds, ensuring complete harmlessness.

2.  Significant reduction: Organic matter decomposes to produce CO ₂ and H ₂ O , which can reduce the volume of materials 30%-50% 。

3.  High degree of resource utilization: Transforming waste into valuable resource products, turning trash into treasure, aligns perfectly with the principles of a circular economy.

4.  The process is mature and stable: the technology is reliable, operating costs are relatively low, and it is suitable for large-scale disposal.

5.  Environmentally friendly: Compared to incineration and landfilling, it produces lower carbon emissions and can also enhance soil carbon sequestration.

 

4.  Construction and Operation Considerations

 

· Site selection: Should be located away from environmentally sensitive areas such as residential zones and water sources, while also considering transportation distances and wind direction.

· Investment and Costs: Investments primarily include civil construction, equipment procurement, and installation. Operating costs mainly consist of electricity bills, labor, conditioning agents, and equipment maintenance expenses.

· Automation level: Depending on the investment budget, systems ranging from semi-automated to fully automated can be selected. The higher the degree of automation, the lower the labor costs and the better the environmental control performance.

· Regulatory Compliance: The design, construction, and operation of the entire project must strictly adhere to national and local environmental protection laws and standards.

 

5.  Implementation Plan Recommendations

 

1.  Preliminary Research: Conduct a detailed analysis of the characteristics (composition, calorific value, moisture content, heavy metal levels, etc.) and generation volume of solid waste to be treated.

2.  Process Selection: Based on material characteristics, processing scale, site conditions, investment budget, and other factors, select the most suitable fermentation process (such as tank-type or reactor-type systems).

3.  Detailed Design: The process flow, general layout, and equipment will be designed in detail by a professional design firm.

4.  Construction and Installation: Choose an experienced contractor for construction work and equipment installation.

5.  Debugging and Operation: Conduct system debugging, train operators, and establish a comprehensive operation management system along with a monitoring plan (e.g., regular inspections of temperature, odor, and product quality).

6.  Product Certification and Market Promotion: Ensure the final product meets relevant standards and establish stable sales channels to achieve economic benefits.

 

Summary: This aerobic fermentation treatment solution is a technically feasible, economically viable, and environmentally beneficial approach for organic solid waste management. By employing precise pre-treatment, a controlled aerobic fermentation process, and stringent environmental management practices, the system can safely and efficiently convert organic waste into valuable resources—making it one of the key technological tools for achieving "zero-waste cities" and supporting sustainable development goals.

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