Application of jet aeration in grease wastewater treatment engineering

Grease wastewater has high organic load and large operation fluctuations. Once the oxygen supply of the aeration system is insufficient or degrades for a long time, it will often cause chain problems such as unstable water output, high energy consumption, and frequent maintenance. Jet aeration is based on "high oxygen utilization + more reliable structure + more convenient maintenance" to provide a more stable oxygenation capacity for the oil wastewater biochemical section, and through transformation to achieve continuous cost reduction and stable compliance with standards.

Why grease wastewater needs more reliable oxygen supply

1. Insufficient oxygen utilization: the oxygenating capacity is insufficient and the water output is easy to fluctuate.
2. Easily clogged/corroded: The longer the mesopore aeration pipe runs, the more obvious the clogging, rust and corrosion will be, and the efficiency will continue to decline.
3. Frequent maintenance affects continuous production: The maintenance cycle of mechanical aeration equipment is short, and water outage maintenance will affect the stability of subsequent processes.
4. Weak impact resistance: unstable processing effects are more likely to occur when the load fluctuates.

Solution: Jet Aeration Transformation Ideas

The original combined oxygen supply method of "compressed mesopore aeration + mechanical aeration" was upgraded to "compressed pressurized jet aeration". Jet aerators and synergistic nozzles are arranged in the aeration tank to achieve higher oxygen utilization and more stable oxygenation performance through jet flow, while simplifying the system and reducing the risk of performance degradation caused by clogging and corrosion.

Program features

1. More efficient oxygenation: high oxygen utilization rate, improved oxygen supply capacity, and more stable water output.
2. More stable long-term operation: the pipeline system is relatively simple, reducing clogging, rust and corrosion, and the oxygenation performance is not easy to decay.
3. More convenient maintenance: the water pump and ejector can be installed outside the pool; the ejector and the synergistic nozzle are maintenance-free, and the water pump is mainly maintained; there is no need to stop and drain the water for maintenance.
4. Lower noise and energy consumption: it can replace mechanical surface exposure machines and provide a better overall operating experience.

Case verification

Project background: The oil wastewater of a certain oleochemical enterprise is treated by biological methods. The process is grille-anaerobic digestion-primary aeration tank-secondary aeration tank-effluent. The original aeration system was a combination of mechanical surface aerator and compressed mesopore tube aeration, which had problems such as low oxygen utilization, insufficient oxygenation, easy clogging and corrosion, frequent maintenance, and unstable water output. Later, ejector was used to transform the oxygen supply equipment of the two-stage aeration tank.

Treatment water volume: about 360m³/d
Water inlet and outlet results (mg/L):
BOD₅：2000 → 25
CODcr：4500 → 70
TKN：200 → 3

Comparison of energy consumption and installed capacity (quantifiable transformation results)

1. Installed power before transformation: 44kW (surface exposure machine 11kW × 4)
2. Installed power after transformation: 30 kW (GW jet aeration 7.5kW × 4)
3. The installed power is reduced: 14kW, and the operating cost is significantly reduced.
4.Unit energy consumption: Energy consumption per 1 kg/COD degraded is reduced from 0.61kWh to 0.45kWh.

Implementation configuration reference (from case)

1. Primary and secondary aeration tanks: A total of 4 GW400 jet aerators are used.
2. Each jet: equipped with 4 N40 booster nozzles.
3. Matching water pump: head 15m, flow 100m³/h, power 7.5kW (single set).

Applicable scenarios

1. The oil and fat wastewater biochemical section has insufficient oxygen supply and fluctuates water output, making it difficult to reach standards stably.
2. The mesoporous aeration pipe is seriously blocked/corroded, and the aeration efficiency continues to decrease.
3. The surface exposure machine has a high failure rate and frequent maintenance, which affects continuous production.
4. It is necessary to achieve "stable compliance with standards + reduction of energy consumption + reduction of operation and maintenance" through transformation.

Frequently Asked Questions (FAQ)

Q1: Why will the water flow be more stable after modification?
A: Jet self-priming/pressurized jet aeration can provide more stable oxygenation capacity, and the system is less susceptible to efficiency degradation due to clogging and corrosion, thereby improving the long-term operation stability of the biochemical section.

Q2: Will the maintenance workload be greater?
A: The case shows that the water pump and ejector can be installed outside the pool, and the ejector and booster nozzle are maintenance-free. Mainly maintaining the water pump; maintenance does not require stopping and draining water, making maintenance more convenient.

Company information

Company website: https://cd-greenwater.com
Technical contact number: 028-85130135
Customer service contact number: 18515915124
Contact email: jane1984@cd-greenwater.com
Address: No. 191, Section 1, Changcheng Road, Xihangang, Shuangliu District, Chengdu City