Pretreatment Project for Fermentation Wastewater from the Kweichow Moutai Distillery

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Project File: Preliminary Treatment Project for Brewing Wastewater at the Kweichow Moutai Distillery

Technical Solution: Three-No Direct-Filter Pre-treatment System

Application Unit: Kweichow Moutai Distillery (Wastewater Treatment Station)

Treatment Objective: Pre-treatment of Brewery Wastewater with High Suspended Solids

Commissioning date: Completed and put into operation in October 2022.

Treatment capacity: 2,000 T/D

Operating Status: Continuous, stable operation for over 3 years

I. Challenge: The Difficulties of Pre-treatment for Brewery Wastewater

Moutai’s brewing wastewater is characterized by high organic matter concentrations, substantial suspended solids, and significant seasonal fluctuations in water quality. The conventional pretreatment process—comprising rotary screening followed by dissolved air flotation—suffers from incomplete solid removal, a heavy load on subsequent biochemical treatment, and high sludge disposal costs, highlighting the urgent need for an efficient and stable pretreatment technology to enhance overall treatment performance.

II. Solution: Three-No Direct-Filter Pre-treatment System

In response to the high suspended solids content in brewing wastewater, we have custom-designed and developed a front-end direct filtration pretreatment unit:

·Passive operation: Utilizes the natural elevation difference between the inlet and outlet of the equipment to drive the filtration process, achieving zero-power filtration.

·Maintenance-free: Utilizing ASSFBR filter elements in conjunction with hydraulic self-cleaning technology, this system completely eliminates the need to replace filter screens or filter cloths.

·Unaffected by water quality fluctuations: Exhibits strong adaptability to variations in influent suspended solids concentration (1,000–10,000 mg/L), ensuring stable effluent quality.

III. Operational Outcomes: Reducing the Burden on Subsequent Processing Systems

Since the system was commissioned, overall wastewater treatment performance has improved significantly:

1. Stable effluent quality: Suspended solids (SS) in the effluent are consistently maintained below 50 mg/L, with a removal efficiency of over 97% for solid particles.

2. Load Reduction: Effectively reduces the organic load on the downstream biochemical system by more than 30%, thereby enhancing the overall treatment capacity of the entire process.

3. Sludge reduction: The separated high-concentration solid phase can be directly utilized as a resource, reducing the total sludge disposal volume by 40%.

4. Cost Optimization: Compared with conventional processes, the pretreatment stage reduces operating costs by 60% and achieves fully automated, unattended operation.

IV. Customer Reviews

The plant’s environmental protection manager reported: “This pretreatment system functions like a highly efficient ‘front-end screen,’ significantly reducing the load on our downstream biochemical treatment tanks. After achieving stable operation, the overall effluent quality has improved markedly, and the system requires virtually no maintenance, effectively resolving the long-standing issue of sludge loss.”

V. Industry Insights

This project has successfully demonstrated the cost-effectiveness and reliability of the “three-no” direct filtration technology in the pretreatment stage of high-concentration organic wastewater, offering an innovative pathway—“front-end load reduction, back-end efficiency enhancement”—for industries such as brewing, food processing, and fermentation. This approach holds significant reference value for improving the overall performance of existing wastewater treatment systems.