Aerobic Fermentation of Organic Fertilizer Using PTFE Semi-permeable Membrane cover

Aerobic Fermentation of Organic Fertilizer Using PTFE Semi-permeable Membrane

1. Introduction

PTFE semi-permeable membrane aerobic composting is an advanced closed aerobic fermentation technology for organic fertilizer production. Raw materials mainly include livestock manure, kitchen organic waste, crop straw, sludge and agricultural by-products. Compared with conventional open-air composting, the PTFE membrane-covered process effectively solves the prominent drawbacks of odor escape, rainwater intrusion, nutrient loss and unstable fermentation affected by ambient weather, realizing high-efficiency, low-pollution and harmless preparation of commercial organic fertilizer.

2. Technical Mechanism

The core is expanded PTFE microporous composite membrane with pore size 0.1–0.3 μm and multi-layer reinforced fabric structure, possessing selective permeability:

1. Outward permeation: Small-molecule CO₂ and water vapor generated by microbial respiration pass through membrane smoothly to prevent internal water accumulation and anaerobic decay.

2. Blocking effect: Macromolecular malodorous gases (ammonia, hydrogen sulfide), liquid mist, pathogens and dust are trapped inside the stockpile to avoid peripheral odor pollution.

3. Heat preservation: The sealed covering locks bio-heat from microbial decomposition, maintaining persistent high temperature of 55–70 ℃ inside compost piles to kill parasite eggs, pathogenic bacteria and weed seeds to meet harmless treatment standards.

Matching bottom forced aeration supplies continuous oxygen to sustain dominant aerobic microbial metabolism and accelerate organic humification.

3. Whole Production Flow

3.1 Raw material blending and conditioning

Mix high-moisture organic raw materials with carbon-rich amendments (straw, sawdust, bran residue). Adjust moisture content to 55%–65% and C/N ratio within 25:1~30:1; remove rigid impurities such as plastic and gravel by crushing and screening.

3.2 Pile building and membrane sealing

Arrange materials into regular strip compost piles above pre-laid aeration pipelines; fully cover and fix the entire pile surface with PTFE semi-permeable membrane to form an independent semi-closed fermentation space isolated from external environment.

3.3 Intelligent aerobic fermentation

The automatic aeration control system dynamically adjusts air supply volume based on real-time temperature, oxygen and humidity data of piles. Frequent mechanical turning is unnecessary. The conventional fermentation period is 18–30 days, far shorter than 50–80 days of traditional open composting. Continuous high-temperature stage over 7 days fulfills sanitary index requirements of organic fertilizer.

3.4 Maturation and deep processing

After primary high-temperature fermentation, materials enter post-ripening to stabilize humus. Finished compost can be crushed, sieved and granulated into powdery or granular finished organic fertilizer complying with national organic fertilizer standards.

4. Key Technical Superiorities

1. Environment-friendly: Over 95% odor interception rate; rain-proof design eliminates leachate generation from rain erosion.

2. High nutrient retention: Effectively inhibits nitrogen volatilization loss, nitrogen retention rate improves by 30%+ versus open compost to promote finished fertilizer quality.

3. Low running cost: Save large labor and fuel cost from repeated pile turning; PTFE membrane features corrosion resistance, ageing resistance and long service life.

4. All-weather operation: Stable production regardless of rainy, cold or high-temperature weather, improving site utilization efficiency.

5. Application Prospect

This technology is widely applied in breeding farms, organic fertilizer factories, rural domestic waste disposal stations and fruit & vegetable base supporting fertilizer processing. Driven by policies of waste resource recycling and chemical fertilizer reduction, PTFE membrane aerobic fermentation has become a mainstream clean production mode for organic fertilizer with broad market potential.

I. Company Introduction

 Qingdao Jiguang Environmental & Energy Technology Co., Ltd. (hereinafter referred to as Jiguang Technology) was established on January 30, 2019 and is located in Laoshan District, Qingdao. Since its establishment, the company has been committed to the R & D, technical optimization and promotion of China's "membrane-covered fermentation technology". It has successively reached cooperation with nearly 100 enterprises and institutions such as New Hope Liuhe, Yili, Changchun Agricultural Machinery Research Institute, Agricultural Expo Park, Nanjing Tech University, etc., and is responsible for the implementation of projects. During this period, a total of more than 1,200 sets of equipment have been promoted, installed and debugged, and projects in Malaysia and the Philippines have also been implemented. Through nearly 6 years of technical promotion and application, the "membrane-covered fermentation technology" has become a widely accepted aerobic fermentation technology in China. With its technical characteristics of low investment, simple operation, low energy consumption and "zero" maintenance, it has been widely used in China and is being promoted as a key agricultural technology in various places.

Scope of application: Livestock and poultry manure (chicken manure, pig manure, cow manure, duck manure), sludge, domestic waste, straw waste, etc.

System composition: e - PTFE composting membrane ·· Intelligent control system ·· Micro - pressure air supply system ·· Monitoring system

II. Technology Introduction

The e - PTFE membrane - covered aerobic composting technology adopted by Jiguang Technology is a process technology that uses a special functional membrane as a covering for the aerobic fermentation treatment of pig manure. The core of this process technology is a functional membrane with special micropores. Its semi - permeable function can achieve a relatively constant climate environment. Under the action of blowing air, a micro - high - pressure inner cavity can be formed in the fermentation body, making the oxygen supply of the pile uniform and sufficient, and the temperature distribution uniform. It creates a suitable environment for aerobic fermentation. Water vapor and carbon dioxide can diffuse out through the microporous structure of the functional membrane, maintaining the air flow balance inside and outside the fermentation pile membrane, ensuring more thorough aerobic fermentation and effectively killing pathogenic microorganisms to ensure the hygienic level of the fermented products.

III. Process Features

1. Environment - friendly, no odor emission.

2. Simple operation, intelligent and unattended.

3. Low energy consumption. It uses low-voltage and low-energy-consuming fans to operate intermittently. It only costs 7 yuan in electricity to ferment one ton of organic fertilizer.

4. "Zero" failure, no need for maintenance, and simple system.

5. High product quality. Through long-time high-temperature fermentation, the organic fertilizer has a high degree of decomposition and good sterilization.