**Application guide for aeration Roots blower in river green water treatment**
Roots blower is mainly used in river green water treatment for water oxygenation, algae inhibition, and sediment activation. It improves water quality through aeration and solves problems such as black and odorous water bodies and eutrophication. The following are its application principles, selection points, installation methods, and maintenance suggestions.
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**1、 The role of Roots blower in river management**
**1. Water oxygenation (core function)**
-Principle: Increasing dissolved oxygen (DO) through aeration promotes aerobic microbial degradation of organic matter.
-* * Effect * *:
-DO increased from<2mg/L to>5mg/L to inhibit odor production (such as HS).
-Reduce algal blooms (decrease in anaerobic algae such as blue-green algae).
**2. Algae inhibition**
-* * Principle * *:
-Oxygenation destroys the anaerobic environment of algae.
-Aeration water flow disturbance suppresses algae aggregation.
-* * Applicable scenarios * *: Eutrophied rivers (with excessive nitrogen and phosphorus).
**3. Activation of sediment**
-Principle: Aeration drives water flow to wash away sediment, avoiding the deposition of organic matter.
-* * Effect * *: Reduce sediment flotation, decrease COD and ammonia nitrogen release.
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**2、 Key points of aeration system design**
**1. Fan selection parameters**
|* * Parameter * * | * * Reference Value * * | * * Explanation * *|
|----------------|----------------------------|-----------------------------|
|* * Airflow * * | 0.5~5 m3/min · mu | Adjust according to the degree of water pollution|
|* * Pressure * * | 9.8~39.2 kPa (water depth of 1~4 meters) | Pressure increases by 9.8 kPa per meter of water depth|
|* * Power * * | 1.5~22 kW | Small river channels 1.5~7.5 kW, large channels 11~22 kW|
|* * Aeration equipment * * | Micro porous aeration tube/nano disk | Oxygen utilization rate>30 (nanotubes are better)|
>* * Note * *: 1 acre ≈ 667 square meters. When the pollution is severe, it can be calculated as * * 1.5~2 m3/min · acre * *.
**2. Selection of aeration equipment**
-Micro porous aeration tube:
-Low cost, wide coverage, suitable for large-scale river channels.
-The oxygen utilization rate is about 25-30.
-Nano aeration disc:
-The bubbles are finer (diameter<1mm) and the oxygen utilization rate is greater than 35.
-Suitable for deep water areas or precise oxygenation needs.
**3. Layout method**
-Fixed riverbed:
-The aeration tube/disc is fixed on the riverbed and secured with counterweights or brackets.
-Suitable for rivers with a depth greater than 1.5 meters.
-Floating type:
-The aeration equipment is suspended on a float and can float with the water level.
-Suitable for rivers with large changes in water level.
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**3、 Recommended selection of Roots blower**
**1. Small river channel (1-5 acres)**
-* * Fan model * *: -50 (3kW, air volume 2.8 m3)/ min@20kPa ）.
-Aeration pipe: DN65 microporous pipe with a spacing of 3-5 meters.
**2. Medium sized river channel (5-20 acres)**
-* * Fan model * *: HC-801 (7.5kW, air volume 6 m3)/ min@30kPa ）.
-Aeration equipment: Nano disk (diameter 300mm), arranged every 50 square meters.
**3. Large river channels (over 20 acres)**
-* * Fan model * *: -100 (15kW, air volume 12 m3)/ min@40kPa ）.
-* * System Design * *: Multiple parallel units+zone control (such as variable frequency regulation).
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**4、 Installation and operation precautions**
**1. Installation points**
-* * Fan position * *:
-Installed in a rain shelter on the shore, with a distance of ≤ 50 meters from the water surface (to reduce pressure loss).
-Pipeline layout:
-The supervisor uses PVC or PE pipes (corrosion-resistant), and the branch pipes are connected to the aeration equipment with flexible hoses.
-Install drainage valves in the pipeline to prevent condensation from blocking.
**2. Operation and maintenance**
|* * Project * * | * * Cycle * * | * * Operation * *|
|------------------|--------------|-----------------------------------|
|* * Check the aeration head * * | Monthly | Clean up blockages (algae, sediment)|
|Fan lubricating oil * * | Replace ISO VG220 gear oil every 3 months ||
|* * Filter cleaning * * | Every 2 weeks | Clean or replace the filter element|
|* * Pressure gauge calibration * * | Every 6 months | Ensure accurate readings|
**3. Common problem handling**
-Uneven aeration: Check if the branch pipe is blocked and adjust the spacing between the aeration heads.
-Fan overheating: Clean the heat sink and check if the voltage is stable.
-* * Sudden drop in pressure * *: Check for pipeline leaks or ruptured aeration heads.
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**5、 Efficiency enhancing technology**
**1. Variable frequency control**
-Advantages: Automatically adjust air volume based on water quality (such as feedback from DO sensors), saving 30-50% energy.
-* * Applicable scenario * *: Rivers with large fluctuations in day and night oxygen demand.
**2. Composite microbial agent**
-* * Used in conjunction with aeration * *: Add nitrifying bacteria and denitrifying bacteria to accelerate pollutant degradation.
**3. Solar power supply**
-* * Suitable for remote river channels * *: wind turbine+photovoltaic panel+battery combination, reducing cable laying.
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**6、 Economic analysis (taking a 5-mu river channel as an example)**
|* * Project * * | * * Cost * * | * * Remarks * *|
|------------------|-----------------------|-----------------------------|
|Roots blower * * | ￥ 8000~15000 | 3~7.5kW model|
|Aeration tube/disc * * | ¥ 50~200/meter (tube) | Nano disc approximately ¥ 500~1000/piece|
|* * Installation and construction * * | ￥ 3000~8000 | Including pipeline and cable laying|
|* * Annual electricity fee * * | ¥ 2000~5000 | Calculated at 0.6 yuan/kWh, with a daily average of 10 hours of operation|
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**Summary**
The Roots blower achieves water quality improvement through * * oxygenation * * in river treatment, and the selection needs to match * * water area, pollution level, and depth * *. Key precautions:
1. Selection of aeration equipment (nanotube efficiency>microporous tube).
2. * * Anti clogging maintenance * * (regularly clean the aeration head).
3. Energy saving optimization (frequency conversion control+solar energy).
In actual projects, it is recommended to conduct * * small-scale experiments * * first to determine the air volume before large-scale application!
