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Application of Jet Aeration in Landfill Leachate Treatment
Application of Jet Aeration(Blower-pressurized Jet Aeration) in Landfill Leachate Treatment
I. Basic Project Overview
1.1 Characteristics of Wastewater
Leachate originates from high-concentration wastewater generated during the transfer, storage, and landfill disposal of solid waste. Influenced by precipitation patterns, waste composition, and ambient temperature, leachate exhibits
the following distinct characteristics:
1.2 Design Water Flow Rate and Water Quality
Designed to treat 200m3/d
| Project | BoD5 | CODcr | NH3－N |
|---|---|---|---|
| Inlet water quality | 2750 | 6500 | 600 |
| Emission Standards | ≤100 | ≤600 | ≤50 |
Design water quality and discharge standards are shown in Table 1.
1.3 Processing Flow
Adjustment Tank - Dissolved Air Flotation Tank - Collection Tank - IC Gas Lift Reactor - Denitrification Tank - Nitrification Tank - Ultrafiltration Membrane - Nanofiltration Membrane - Effluent
II. Major Equipment and Structures
Nitrification tank: 1 unit, dimensions diameter × height = Φ8.5 × 6 m;
Jet Aeration Equipment: GW1200 jet nozzles, 3 units; N70 enhanced nozzles, 12 units;
Jet pump: Flow rate 720 m³/h, head 14 m, installed power 45 kW, quantity 1 unit.
III. Operational Processing Results
Since adopting the forced-air pressurized jet aeration method, the system has demonstrated excellent performance in actual operation. The actual inflow and outflow water quality is shown in the table below:
| Project | BoD5 | CODcr | NH3－N |
|---|---|---|---|
| Raw water inlet | 2500-4000 | 6000-8000 | 500-700 |
| Final drainage | 90 | 500 | 50 |
Actual Inlet Water Quality and Treatment Results (mg/l).
By comparing designed water flow and quality with actual operational treatment results: The GW forced-air pressurized jet aeration method for oxygenation offers the following advantages:
3.1 Excellent oxygenation capacity with stable effluent quality, meeting or exceeding design discharge standards.
3.2 Simple installation and maintenance: The pump is installed outside the tank, making maintenance and repairs convenient.
3.3 Blower-pressurized jet aeration features low noise and energy consumption, with strong resistance to shock loads.
3.4 The piping system is simple and free from blockages, making operation and management straightforward.
3.5 The jet nozzle and enhanced nozzle maintain consistent performance over extended operation, requiring no maintenance and significantly reducing repair costs.
3.6 The nitrification aeration system consumes 0.83 kWh per kilogram of COD degraded.