Application of Membrane Concentration Technology in Biogas Slurry Treatment

The membrane concentration equipment designed and manufactured by Shandong Qisheng Membrane (including ceramic membrane, ultrafiltration, nanofiltration, reverse osmosis, and other series) combines the dual functions of impurity separation and nutrient concentration. Under suitable pressure conditions, it efficiently retains organic matter, humic acids, and nutrients such as N, P, and K from biogas slurry, while simultaneously removing suspended particles, colloids, and certain pollutants. This perfectly addresses the traditional challenges of high water content and low nutrient concentration in biogas slurry, maximizing the preservation of natural nutrient activity. The equipment employs a cross-flow filtration design, preventing retained impurities from accumulating on the membrane surface and thoroughly resolving filtration clogging issues. It eliminates the need for frequent membrane module replacement, significantly reducing treatment costs and providing core support for the resourceful utilization of biogas slurry.

Biogas Slurry Membrane Concentration Treatment Process Flow

Livestock and Poultry Manure Fermentation Biogas Slurry → Solid-Liquid Separation → Static Settling → Ceramic Membrane Pretreatment → Ultrafiltration Impurity Removal → Nanofiltration Refining → Reverse Osmosis Concentration → Concentrate (Organic Liquid Fertilizer) → Permeate (Reusable Meeting Standards)

Core Technologies of Biogas Slurry Membrane Concentration Treatment

In biogas slurry treatment, Shandong Qisheng adopts a "multi-stage membrane in series" technical approach, with each membrane module precisely matched to process requirements: Ceramic membranes and ultrafiltration undertake pretreatment and impurity removal duties, efficiently removing suspended particles, colloids, and macromolecular impurities under 0.35–0.48 MPa pressure, with membrane flux stabilized at 40–160 L·m⁻²·h⁻¹. Nanofiltration achieves preliminary nutrient concentration and salt adjustment under 0.65–1.1 MPa pressure, achieving a concentration factor of 4–5 times. Reverse osmosis, as the core concentration unit, concentrates biogas slurry by 6–8 times under optimized pressure of 4.5–5.5 MPa, maximizing the retention of nutrients such as N, P, K, and humic acids. The entire process requires no high-temperature treatment and does not alter nutrient characteristics, effectively addressing challenges of biogas slurry transportation, disposal conflicts, and secondary pollution.

Process Advantages

(1) Stable Treatment Performance and Excellent Nutrient Retention: Multi-stage membrane series with controllable precision increases nutrient concentration in concentrated biogas slurry by 6–8 times, with organic matter retention exceeding 90%. The resulting organic liquid fertilizer exhibits superior efficacy. The permeate meets standards for reuse, achieving zero discharge.

(2) Long Service Life and Strong Fouling Resistance: Membrane modules exhibit excellent resistance to microbial fouling. The cross-flow filtration design minimizes fouling, ensuring extended service life and sustained high permeate flux.

(3) Low Energy Consumption and Cost-Effectiveness: Optimized pressure parameters tailored to different membrane processes reduce energy consumption by over 40% compared to vacuum evaporation. Reduced membrane replacement frequency and labor costs result in a short payback period.

(4) Fully Automatic Control: Equipped with PLC fully automatic control system with touchscreen operation, enabling online monitoring of pressure, temperature, and other parameters to prevent manual errors and ensure process stability.

(5) Strong Adaptability and Regulatory Compliance: Equipment can be customized based on biogas slurry types (cow manure/pig manure/straw fermentation). Constructed with corrosion-resistant and wear-resistant materials, it complies with environmental discharge standards and organic fertilizer production regulations, making it suitable for large and medium-sized biogas projects.

Successful Cases

Zhangye Large-Scale Biogas Project in Gansu (cow manure + straw fermentation biogas slurry), Weifang Livestock and Poultry Farming Biogas Slurry Treatment Project in Shandong, Zhengzhou Large-Scale Biogas Project Biogas Slurry Concentration Production Line in Henan, and others.

Shandong Qisheng Membrane Separation Technology Co., Ltd. offers a diversified membrane product portfolio covering reverse osmosis, ceramic membranes, ultrafiltration, nanofiltration, and other series. With high and stable filtration precision, polysaccharide purity reaches 90%+, active ingredient retention rate 93%+, biogas slurry concentration 6–8 times with nutrient retention 90%+. The strong anti-fouling properties and cross-flow design effectively solve clogging issues, ensuring long membrane service life. Customizable for different feedstock types (cow manure/pig manure biogas slurry, etc.), the technology has been successfully applied in multiple projects across various regions, including Hubei dark brick tea and Zhangye biogas slurry treatment, validating its technical reliability.

Shandong Qisheng Membrane is a professional manufacturer of membrane separation equipment with years of production experience and strong technical expertise. We focus on solving filtration and concentration challenges in biopharmaceutical fermentation, beverage production, traditional Chinese medicine extraction, and plant/animal extraction processes.

The company adopts a circular production model, effectively helping clients improve production efficiency and achieve clean production goals. Should you encounter any challenges in membrane filtration technology applications, please feel free to contact Shandong Qisheng Membrane. Our professional technical team will provide targeted solutions tailored to your needs.