The working principle and design requirements of aerobic pond

The basic principle of aerobic pond purification of sewage is shown in Figure 8-2
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Figure 8-2 Schematic diagram of the working principle of Haochlorine Pond

The degradation process of organic matter in the aerobic pond is essentially the process of transforming dissolved organic pollutants into inorganic matter and solid organic matter-bacteria and algae cells
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8.

(1) The high-load aerobic pond has higher organic load, shorter hydraulic retention time (HRT), and shallower pond water depth
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(2) The organic load of the ordinary aerobic pond is lower than the former, and the hydraulic retention time is longer
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(3) The organic load of the advanced treatment aerobic pond is low, and the hydraulic retention time is also short
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2.
1.
2 Features and applicable conditions of aerobic pond

Advantages: low investment; convenient management; short hydraulic retention time, fast rate of degradation of organic matter, and high degree of treatment
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Disadvantages: the pond has a large capacity and a large area; the treated water contains a large amount of algae, and the effluent needs to be treated with algae; the removal of bacteria is poor
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Applicable conditions: It is suitable for removing nutrients and treating dissolved organic matter; because of its better treatment effect, it is mostly used for further treatment after series connection in other stable ponds to treat the effluent after secondary treatment
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2.
1.
3 General provisions of Haochlorine Pond

① The aerobic pond should be built in a place with suitable temperature, sufficient sunlight and good ventilation
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② It can be used alone or connected in series with other processing systems for advanced processing
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③If the aerobic pond is used to treat wastewater separately, it must be thoroughly pretreated before the wastewater enters the aerobic pond
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2.
1.
4 Design calculation of aerobic pond

(1) Design method In actual engineering, empirical data is often used for design, namely BOD ₅ surface load method
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(2) Structure and main dimensions

①Aerobic ponds are mostly rectangular ponds with a length-to-width ratio of (3:1) to (4:1)
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② Pond depth: high-load aerobic pond 0.
3～0.
45m; ordinary aerobic pond 0.
5～1.
5m; advanced treatment aerobic pond 0.
5～1.
5m; the super height of aerobic pond is 0.
6～1.
0m
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③ Embankment slope: slope inside the pond (1: 2) ~ (1: 3); slope outside the pond (1: 2) ~ (1: 5)
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④ Number of ponds and area of ​​a single pond: Generally, the number of aerobic ponds is not less than 3, and at least two
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Table 8-3 Typical design parameters of aerobic pond