How to clean the silt at the bottom of the sedimentation tank?

The sludge and sewage in the oxidation tank are mixed and enter the sedimentation tank in the form of artesian flow.

Sedimentation is carried out in the sedimentation tank, the supernatant overflows to the reclaimed tank for reuse, and the precipitated sludge is lifted and returned to the oxidation tank or sludge tank at the bottom of the sedimentation tank through an air stripping device and a return pipe.

When the sludge sedimentation ratio.

When it is less than 30, the sludge is digested aerobically, and aerobic digestion is the process of aerobic bacteria degrading organic matter under the condition of aeration; When the sludge sedimentation ratio is greater than 50, the sludge is filtered by pressing. Filter presses are used in filter press operations.

The slurry is pressed, the sludge and water are separated after the filter, and then the sludge is collected for unified treatment.

In the process of filter press operation, a lot of manpower and material resources need to be consumed, and at the same time, the treatment of the sludge from the filter press needs to be treated by a relevant third party in a unified manner, which consumes a high cost. Compared with the prior art, when the sludge sedimentation ratio is 30 50 in the present invention, it is not necessary to carry out filter pressing operation.

It greatly reduces the amount of sludge transport, and at the same time, due to the use of anaerobic plus aerobic treatment mode, compared with a single aerobic treatment method, the sludge treatment efficiency is significantly improved, the sludge transport volume is further reduced, and the sludge treatment cost is saved while saving manpower and material resources.

Precautions to be taken during operation.

1. Before cleaning the sedimentation tank and cleaning the sedimentation tank, it is necessary to formulate a sedimentation cleaning plan and assign the cleaning task to the cleaning personnel.

2. Before taking up their posts, the clean-up personnel must be familiar with the river safety technical measures of the construction plan.

And strictly enforced.

3. Before cleaning the sedimentation tank, set up warning signs and guardrails, and ensure the integrity and flexibility of the cage and the minecart.

4. Pump out the water in the pool, and dilute the sludge in the sedimentation tank with equipment, so that the sludge and debris in the pool can be pumped smoothly.

5. Clean up the sludge and debris pumped out and clean up the site.

6. Ensure that after the sedimentation tank is cleaned, the surrounding walls are clean and the bottom is clean.

The silt at the bottom of the sedimentation tank has more garbage and large sediment, therefore, we need to manually go down to the pool and clean it mechanically, and the workers should ventilate the pool before going down to the pool, and the gas detection can only go down the pool. Note that the construction personnel who clean the sewage sedimentation tank must be specially trained and have a confined space operation certificate before they can go down.

For ponds with low silt: 1. Directly drain the pond water and carry out wind and sun exposure. After freezing, wind and exposure throughout the winter, it can effectively promote the decomposition of organic matter and kill some pathogenic bacteria, reducing the occurrence of diseases in the coming year.

2. The substrate is improved with quicklime, and the specific measures can be divided into two types: dry socks forest method and wet method. Precautions for dredging: 1. Dredging machinery should be considered comprehensively according to the conditions of your own pond, the thickness of the mud and the economic affordability, such as bulldozers, dredging pumps or dredging boats; 2. In the process of dredging, it is not advisable to remove all the silt, and the silt with a thickness of about 10-20 cm should be retained, so as to prevent bad fertilizer and water in the spring of the next year.

Commonly used several dredging methods 1, water dredging is mainly the use of dredging machinery to carry out dredging work. Such as large dredging machinery: dredgers, he is more suitable for large reservoirs, lakes.

Small machinery: dredging machine, mud pump, this is more suitable for the dredging work of small and medium-sized ponds, and the labor and cost are relatively low, and now most of them choose this kind of machinery for dredging. I have to emphasize here that when using a mud pump to desilt, you have to have a place to store the mud, and after the mud settles, you can also grow crops on it.

2. Comparison of dry pond dredging.

Summary. After draining the water, use machinery or manual shoveling off, you can also stir the mud while pumping water, if there is too much mud, you need to use a mud pump to pump, and the effect of water centrifugal pump pumping is not good. Mud pumps are sold in agricultural machinery or mining machinery stores.

Or use the following method There is a special swimming pool cleaning equipment, you can search the Internet through the keyword "swimming pool cleaning". However, in general, if there is silt in smaller swimming pools, you can clean it up with a brush and a water gun when releasing water.

After draining the water, use machinery or manual shoveling off, you can also stir the mud while pumping water, if there is too much mud, you need to use a mud pump to pump, and the effect of water centrifugal pump pumping is not good. Mud pumps are sold in agricultural machinery or mining machinery stores. Or use the following method There is a special swimming pool cleaning equipment, you can search the Internet through the keyword "swimming pool cleaning".

However, in general, if there is silt in smaller swimming pools, you can clean it up with a brush and a water gun when releasing water.

Good mud pump.

It is a mud pump which I bought.

The water depth is more than 2 meters.

How to pump out the silt in the pond, the key is not to release water.

It is a bit difficult not to release water, and the mud water will also become turbid, and it is inevitable that some water will come out.

A better approach is to let the slurry pump sink to the bottom of the pond and extract it at a depth of 30 centimeters.

1.What to pay attention to when dredging.

For the newly opened fish pond, can put green manure in the pond, adopt the method of manure to make silt as soon as possible, make the humus in the silt inlaid in the soil gap, and cover the soil, make it basically isolated from the original soil quality, can play the role of fertilizing, fertilizer preservation and fertilization.

After one year of fish farming, a large amount of silt is deposited at the bottom of the pond (usually about 10 cm per year). Therefore, after fishing in the dry pond, the silt around the bottom of the pond should be dug up and placed on the slope of the embankment and the embankment, and when it is slightly dry, it should be attached to the slope of the embankment, and then immediately transplanted ryegrass or greens, etc., as the green fodder of the fish.

In this way, it can not only improve the pond conditions, increase the water storage, but also provide high-quality fertilizer for the planting of green fodder, and also reduce the collapse of the pond slope and embankment due to the mud slope protection effect of the grass roots. After touching the beam and rectifying the pond, use medicine to clear the pond.

2.How to desilt ponds.

The so-called pond dredging is to remove too much silt.

Under normal circumstances, the pond maintains 10 20 cm of silt is beneficial to aquaculture production: if the limit is exceeded, it not only reduces the water body, but also increases the oxygen consumption of the pond water, which is easy to cause a flood pond accident, and is also easy to induce fish diseases. Therefore, the elimination of excessive sludge is a very important technical link.

However, due to the large and arduous amount of dredging labor, often many production units have not been treated, with the passage of time, the pond silt accumulates thicker and thicker, so that the production capacity is significantly reduced, and at the same time is not conducive to aquaculture sewer operation. Most of the cases occur in farms that have been raising fish for more than 10 years without dredging, and some old ponds are even more serious.

In order to restore pond productivity, pond dredging must be carried out. The easiest way to desilt a pond is to drain the pond water, dry the mud, and then manually dig up the excess silt.

But this method is too labor-intensive, too inefficient, and too slow, and people are often reluctant to adopt it. In some localities, the method of rotating crops of fish and rice, fish barnyard and fish and melon is adopted, and the pond mud is first used to plant rice to harvest rice, melons to harvest melons, or barnyard grass as grass-fodder for herbivorous fish, or some of them are used as green manure to cultivate fish fingerlings, silver carp, and bighead carp as natural bait.

When the pond mud is dried, it is operated intensively with machinery (bulldozers, excavators, etc.), and the dredging is closely combined with pond maintenance and slope protection. Of course, this method is very effective, but it requires certain investment conditions to be implemented.

When the pond service life is shorter, the embankment is relatively complete, or the pond slope is hardened, does not need a large number of maintenance, can adopt the dredging ship modified by turbidity flow, water dredging operation, every year or every other year, part of the silt with water is transported to the pond embankment serving place (the ridge side builds a small embankment to hold mud) as a kind of green fertilizer, or transported to other low and shallow ponds, waste land, or the end of the non-production season, discharge most of the pond water, use a special dredging machine to desilt. At present, there are several types of dredging machinery such as mud pump type and winch model used in some areas.

In short, pond dredging is more difficult, and the way and method of mechanical efficient dredging need to be further studied.

There is a sludge bucket used to accumulate the sedimented sludge, which is mostly located below the bottom of the pond at the front of the pool, and there is a sludge discharge pipe at the bottom of the bucket to discharge the sludge regularly.

The sedimentation tank is generally a structure for the separation of slurry and water before or after biochemistry, and is mostly sludge with finer particles. Before biochemistry, it is called the primary sedimentation tank, and the sedimented sludge has more inorganic components, and the water content of the sludge is lower than that of the secondary sedimentation tank. The sedimentation tank located after biochemistry is generally called the secondary sedimentation tank, which is mostly organic sludge with high water content.

Timely sludge discharge is an extremely important task in the operation and management of sedimentation tank. The amount of sludge contained in the sedimentation tank in sewage treatment is more, most of which is organic matter, if the sludge is not discharged in time, anaerobic fermentation will be produced, resulting in the sludge floating, which not only destroys the normal operation of the sedimentation tank, but also deteriorates the effluent water quality, such as the solubility BOD value in the effluent rises; pH drops, etc.

The initial sedimentation tank sludge discharge cycle should generally not exceed 2 days, the secondary sedimentation tank sludge discharge cycle should generally not exceed 2 hours, when the sludge discharge is not thorough, the pool should be stopped (empty) to clean the mud by manual flushing.

The sedimentation tank of mechanical sludge discharge should strengthen the maintenance and management of sludge discharge equipment, and once the mechanical sludge discharge equipment fails, it should be repaired in time to avoid excessive mud accumulation at the bottom of the pond and affect the effluent quality.

After the wastewater in the neutralization sedimentation tank is completely settled by lime coagulation, the sludge has been clearly separated, and the chemical sludge is deposited in the lower part of the reaction tank. When discharging the sludge, the sludge pipeline valve at the bottom of the sedimentation tank and the sludge pipeline valve of the sludge tank should be opened first, and the slurry should be pressed out of the reaction tank and discharged into the sludge tank by using the pressure of the water level, and the sludge pipeline valves of the two pools should be closed after the sludge discharge is completed. Then open the sewage valve and put the clear liquid into the regulating tank.

The neutralization sedimentation tank is equipped with a decanter, which is constructed to fix a hose under a rubber ring, and the other end of the hose is connected to the sewage outlet pipe at the lower part of the tank. It works on the principle that the rubber ring floats on the water surface and rises and falls with the water surface. Since the slurry separation always starts from the water surface, as long as there is a clear liquid formed on the water surface, the clear liquid will flow out of the pool through the hose, so the drainage and slurry separation are synchronized, and there is no need to wait for the muddy water to be completely separated before discharging the mud and drainage, which saves the operation time.

However, it should be noted that when stirring and coagulation, the decanter should be lifted out of the water to prevent the mud from entering the hose.