Advantages and disadvantages of stabilization pond treatment process

8.
1.
1.
4 The advantages and disadvantages of the stabilization pond treatment process

(1) Advantages

①It has the characteristics of low energy consumption, convenient operation and maintenance, and low cost
.

Wind energy is one of the important auxiliary energy sources of the stabilization pond.
After proper design, the natural aeration and oxygenation of wind energy can be realized in the stabilization pond, so as to save electric energy and reduce processing energy consumption
.

In addition, there is no need for complex mechanical equipment and devices in the stabilization pond, which makes the operation of the stabilization pond more stable and maintains a good treatment effect, and its operating cost is only 1/5 to 1/3 of the conventional sewage treatment plant

②It has the characteristics of realizing the water cycle, which not only saves water resources, but also obtains economic benefits
.

Convert organic matter in sewage into aquatic crops, fish, waterfowl and other substances, and provide them for human use or other purposes
.

The treated sewage in the stabilization pond can be used for agricultural irrigation, and can also be used for aquatic plants and aquatic products in the treated sewage

③The terrain can be fully utilized, and the structure of the structure is simple
.

The sewage treatment stabilization pond system can be used to make use of abandoned rivers, swamps, canyons, abandoned reservoirs and other areas.
The construction structure is simple, and most of them are earth-rock structures.
The construction land has the advantages of short construction period, easy construction and low capital construction costs.

.

The infrastructure investment of sewage treatment and utilization of ecological engineering is about 1/3 to 1/2 of that of conventional sewage treatment plants of the same scale

④ It can beautify the environment and form an ecological landscape
.

The purified sewage is introduced into the artificial lake and used as a water source for landscape and sightseeing
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The resulting treatment and utilization ecosystem will not only become an effective sewage treatment facility, but also a modern ecological agricultural base and tourist attraction

⑤The feature of low sludge volume
.

Because the sludge produced in the front-end treatment system of the stabilization pond can be sent to the lotus pond or reed pond in the ecosystem or nearby farmland, it can be used and consumed as organic fertilizer
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A pond system with an anaerobic pond or a facultative pond at the front end makes the sludge acidified, hydrolyzed and methane fermentation through the sludge fermentation pit at the bottom.

⑥Strong anti-impact load and ability
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The stable pond can not only effectively treat high-concentration organic water, but also low-concentration sewage
.

However, the BOD concentration of sewage in many cities in China is very small, less than 100mg/L, which is suitable for the application of stabilizing pond technology

(2) Disadvantages

①It covers a large area
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②The stabilization pond is located in the natural environment, and the climate has a great effect on it
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③If the design or operation management is not in place, it will cause secondary pollution
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8.
1.
1.
5 Stabilizing the pond body and its inlet and outlet

(1) Design points of the stabilization pond

①Pond position

a.
The pond body is generally rectangular, and the corners should be rounded
.

b.
The design of the pond body should consider impact resistance and damage resistance
.

c.
If a multi-stage stabilization pond system is adopted, the overtaking setting should be considered between the stabilization ponds at all levels
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②The width and slope of the top of the embankment
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The minimum width of the top of the embankment is 1.

③Requirements on the bottom of the pond

a.
It should be fully compacted and as flat as possible, and the completed height difference of the pond bottom shall not exceed 0.
5m
.

b.
The pond body directly below the surface aerator of the aeration pond must be reinforced with concrete
.

c.
Anti-seepage measures must be taken
.

(2) The inlet and outlet of the stabilization pond

① The design principle of the water inlet is: for a general rectangular pond, the water inlet should be set at 1/3 of the length of the pond
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The reason is to avoid short flow, channel flow, back-mixing phenomenon and dead zone in the pond, make the state of the water flow in the pond as close as possible to push flow, so as to increase the average residence time of the influent in the pond

②The layout principle of the water outlet is: set up adjustable outlet orifices or weirs to meet the changing requirements of different water depths in the pond
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Before the exit of the stabilization pond, a scum baffle should be installed, but before the advanced treatment pond, no baffle should be installed to avoid trapping algae
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③For multi-level stabilization ponds, separate gates should be set up at each entrance and exit of the stabilization ponds at all levels
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④ The inlet and outlet should adopt multi-point water inlet and multi-point water outlet to make the water distribution on the cross section of the pond as even as possible
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⑤ The straight-line distance between the inlet and the outlet should be as large as possible
.
It is usually arranged diagonally
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⑥The entrance and exit should be at least 0.
3m away from the pond surface
.
The inflow of the anaerobic pond should be close to the sludge layer at the bottom
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⑦The direction from import to export should avoid the prevailing local wind direction throughout the year to prevent odor pollution
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(3) Oxygenation facilities

① If there is a certain height difference between the inlet water elevation of the aeration pond and the pond water surface elevation, then this height difference can be considered for oxygenation by falling water
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If the height difference is large, a multi-stage water drop should be constructed
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②The oxygenation of the aeration pond is the same as other aerobic processes
.
For example, blower aerators, surface aerators, horizontal axis rotating brush aerators, etc.
are widely used in activated sludge process and oxidation ditch process
.