CN111777147A - Add net flocculation sedimentation tank of throwing diatomaceous earth - Google Patents
Add net flocculation sedimentation tank of throwing diatomaceous earth Download PDFInfo
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- CN111777147A CN111777147A CN202010689571.6A CN202010689571A CN111777147A CN 111777147 A CN111777147 A CN 111777147A CN 202010689571 A CN202010689571 A CN 202010689571A CN 111777147 A CN111777147 A CN 111777147A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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Abstract
The invention provides a grid flocculation sedimentation tank for adding diatomite, which comprises a grid flocculation sedimentation tank, a water production tank and a sludge circulation tank, wherein a water production pipe of the grid flocculation sedimentation tank is connected with the water production tank, a sludge discharge pipe is connected with the sludge circulation tank, a dosing point of the sludge circulation tank is used for adding the diatomite, and a sludge return pipe is used for returning sludge containing the diatomite, a flocculating agent or a coagulant aid to the grid flocculation sedimentation tank. The invention aims to improve the pretreatment efficiency of low-temperature low-turbidity water and high-salt content seawater and sewage wastewater, selects a grid flocculation sedimentation tank which does not contain rotating equipment and is easy to prevent corrosion, designs that diatomite is added into a sludge circulation tank for sludge backflow, removes suspended particles which are difficult to remove by a conventional coagulation sedimentation process in water by utilizing the strong adsorption capacity of the diatomite to micro-floc organic matters, algae and the like in a water body, saves the adding amount, and can reduce the water inlet temperature difference by adjusting the flow of the backflow sludge when the water inlet temperature difference is large in a short time so as to avoid tank turnover.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a grid flocculation sedimentation tank added with diatomite.
Background
With the development of economy and the increase of population, the demand of human beings on water resources is continuously increased in China, and in addition, water shortage is caused by the fact that water sources in local regions are distributed less due to regional differences of water resource distribution, and the water resources cannot be utilized due to the fact that the physical form or the water quality of water resources in the regions are deteriorated, so that water resource shortage of different degrees occurs in all regions. The shortage of water resources is mainly divided into two aspects: resource-based water deficit and aqueous water deficit. At present, the problem of water shortage caused by resource is solved, certain unavailable water is mainly developed and utilized, the main mode is seawater desalination, particularly industrial enterprises at seasides, and the direct or indirect utilization (seawater desalination) of seawater is a main solution way for solving the problem of water resource shortage of cities at seasides in the future; the problem of water shortage is solved mainly by carrying out advanced treatment on polluted water bodies. The biggest difference between the seawater quality and the fresh water quality is that the salt content is different, the types of organic pollutants in water basically tend to be the same along with the development of industrial enterprises (particularly the development of aquaculture industry, a large amount of excrement and bait of aquatic products are discharged into water, the curing degree of the excrement is higher, and particles are fine and difficult to precipitate), and the content of suspended matters is increased. The pollutants contain a large amount of humus, and are difficult to remove by a conventional pretreatment system in the coagulating sedimentation pretreatment, and some pollutants can penetrate through an ultrafiltration membrane and a reverse osmosis membrane, and cannot be removed by a filter tank. Resulting in the failure of the subsequent water treatment facilities to operate properly.
The conventional pretreatment coagulating sedimentation equipment comprises a grid flocculating sedimentation tank, a high-density sedimentation tank and a mechanical accelerated clarification tank. The high-density sedimentation tank and the mechanical accelerated clarification tank are mainly used for adding lime to remove the alkalinity and temporary hardness in water, and the lime floc has no adsorption function, so that only flocculant and coagulant aid are added when low-pollution water is treated, the formed floc has small particles and small quantity, the large adding amount of the flocculant and the coagulant aid has poor sedimentation effect, and the high-density sedimentation tank and the mechanical accelerated clarification tank are not suitable for treating micro-polluted water; and because the high-density sedimentation tank and the mechanical accelerated clarification tank need to be provided with a large-scale mud scraper and a large-scale stirring device (the conventional mud scraper and the conventional stirring device are made of carbon steel), the corrosion resistance is poor, and the high-density sedimentation tank and the mechanical accelerated clarification tank are not suitable for treating water with high salt content.
The grid flocculation sedimentation tank is low in load, mechanical rotating equipment is not arranged in the grid flocculation sedimentation tank, the problem of equipment corrosion does not exist, and the grid flocculation sedimentation tank is particularly suitable for treating low-temperature low-turbidity water and high-salinity seawater and sewage. However, the conventional grid flocculation sedimentation tank discharges sludge regularly, no sludge backflow exists, the removal efficiency of fine suspended matters of organic matters is low, and when the fluctuation of the suspended matters in inlet water is large (particularly when low-temperature low-turbidity water is treated), the quality of produced water is unstable, and the requirement of the produced water quality cannot be met. And when the temperature difference of the inlet water is large in a short time, the pool is easy to turn over, and the treatment effect is influenced.
Disclosure of Invention
The invention aims to improve the pretreatment efficiency of low-temperature low-turbidity water and high-salt-content seawater and sewage, selects a grid flocculation sedimentation tank which does not contain rotating equipment and is easy to prevent corrosion, designs that diatomite is added into a sludge circulation tank and performs sludge backflow, and removes suspended particles which are difficult to remove by a conventional coagulation sedimentation process and are fine in water by utilizing the strong adsorption capacity of the diatomite on suspended particles such as organic matters, algae and the like of micro flocs in a water body, good filterability and chemical stability. Meanwhile, the return sludge containing the diatomite contains the returned flocculating agent or coagulant aid, so that the dosage of the flocculating agent or coagulant aid at the flocculation section of the grid flocculation sedimentation tank can be saved, and the dosage is saved. And the water inlet temperature difference can be reduced by adjusting the flow of the returned sludge when the water inlet temperature difference is larger in a short time, the pool is prevented from being turned over, and the treatment effect is improved.
The invention provides a grid flocculation sedimentation tank for adding diatomite, which comprises a grid flocculation sedimentation tank, a water production tank and a sludge circulation tank, wherein the water production tank and the sludge circulation tank are connected with the grid flocculation sedimentation tank;
the grid flocculation sedimentation tank comprises a grid flocculation sedimentation tank body, a water inlet pipe arranged on one side of the grid flocculation sedimentation tank body, a water production pipe arranged on the upper part of the grid flocculation sedimentation tank body and opposite to the water inlet pipe, a main sludge discharge pipe formed by converging a plurality of sludge discharge pipe branches and arranged at the bottom of the grid flocculation sedimentation tank body, and a first sludge discharge valve arranged on the main sludge discharge pipe; the water outlet of the water production pipe is connected with the water production pool, and the sludge outlet of the main sludge discharge pipe is connected with the sludge circulation pool; the mesh flocculation sedimentation tank body comprises a flocculation area and a sedimentation area arranged in the drainage direction of the flocculation area, a water inlet pipe is connected with the upper part of the flocculation area, a water production pipe is connected with the upper part of the sedimentation area, and a main sludge discharge pipe is connected with the flocculation area and the bottom of the sedimentation area through a sludge discharge pipe branch;
the sludge circulating tank comprises a sludge circulating tank body, a first dosing point arranged at the upper part of the sludge circulating tank body, a sludge conveying pipe arranged at the lower part of the sludge circulating tank body and opposite to the main sludge discharge pipe, a sludge lifting pump arranged on the sludge conveying pipe, a sludge return pipe communicated with the middle part of the sludge conveying pipe and a second sludge discharge valve arranged at the tail end of the sludge conveying pipe; the first dosing point is used for dosing diatomite, and a sludge discharge port of the sludge return pipe is communicated with the middle part of the water inlet pipe and used for returning the diatomite-containing sludge to the grid flocculation sedimentation tank.
As a preferred mode, the grid flocculation sedimentation tank further comprises a second dosing point which extends into the flocculation area and is used for throwing a flocculating agent or a coagulant aid, and the sludge return pipe is used for returning sludge containing the diatomite, the flocculating agent or the coagulant aid to the grid flocculation sedimentation tank body.
As a preferred mode, the mesh flocculation sedimentation tank added with the diatomite is internally provided with a stirring device.
As a preferred mode, the grid flocculation sedimentation tank added with the diatomite is provided with a first flowmeter and a turbidity meter on a water inlet pipe.
As a preferred mode, the water outlet of the first flowmeter is arranged at one end of the water inlet of the turbidimeter.
The invention relates to a mesh flocculation sedimentation tank for adding diatomite, which is characterized in that a tee joint is arranged on a water inlet pipe between a first flowmeter and a turbidity meter as a preferred mode, and a sludge discharge port of a sludge return pipe is connected to the tee joint; a first thermometer is arranged on the water inlet pipe between the water outlet of the first flowmeter and the water inlet of the tee joint, a second thermometer is arranged at one end, close to the cell body of the grid flocculation sedimentation cell, of the water inlet pipe, and the first thermometer and the second thermometer are used for measuring the water inlet temperature difference.
As a preferred mode, one end of the sludge return pipe, which comes from the grid flocculation sedimentation tank, is provided with a sludge return valve.
As a preferred mode, the grid flocculation sedimentation tank added with the diatomite is characterized in that a second flowmeter is further arranged on the sludge return pipe.
As an optimal mode, a water inlet of the second flowmeter is arranged at one end of a water outlet of the sludge reflux valve.
According to the mesh flocculation sedimentation tank added with the diatomite, the diatomite is diatomite dry powder as a preferable mode.
Raw water enters a grid flocculation sedimentation tank body through a water inlet pipe, return sludge added with diatomite and the raw water enter the grid flocculation sedimentation tank body together, the return sludge containing the diatomite is uniformly mixed with the raw water in a water inlet pipe pipeline, the return sludge enters the grid flocculation sedimentation tank body and then fully exerts the adsorption and coagulation effects on pollutants in sewage, a second dosing point added with a flocculating agent or a coagulant aid is arranged in a flocculation area of the grid flocculation sedimentation tank, the flocculation effect of the pollutants in the raw water is further enhanced by adding the flocculating agent or the coagulant aid, large-particle flowers are formed by taking particles of the diatomite as cores, the sedimentation is easy, and the large-particle flowers are removed through sludge discharge. The returned sludge containing the diatomite contains the returned flocculating agent or coagulant aid, so that the adding amount of the flocculating agent or coagulant aid in the flocculation area of the grid flocculation sedimentation tank can be saved, and the adding amount is saved; the water inlet pipe is provided with a first flowmeter and a turbidity meter, and the return flow of the return sludge of the diatomite is adjusted according to the flow of the inlet water and the turbidity of the mixed water;
after raw water is treated by the grid flocculation sedimentation tank, supernatant enters the water production tank through a water production pipe; the method comprises the following steps that precipitated sludge enters a sludge circulation tank through a sludge discharge pipe branch, a first sludge discharge valve and a main sludge discharge pipe, the sludge circulation tank comprises a sludge circulation tank body and a first dosing point for adding diatomite, a stirring device is arranged in the sludge circulation tank body, and the stirring device has two functions, namely, sludge precipitation in the sludge circulation tank body is prevented, and the added diatomite is uniformly mixed; the diatomite dry powder is directly added and uniformly stirred in the sludge circulating tank body, so that the medicament mixing equipment is saved; the sludge-water mixture in the tank body of the sludge circulating tank is lifted by a sludge lifting pump regulated by frequency conversion and is conveyed by a sludge conveying pipe, the sludge conveying pipe is divided into two paths, one path of sludge is mixed with raw water by a sludge return pipe through a sludge return valve and then enters a grid flocculation sedimentation tank, and a second flowmeter is arranged on the sludge return pipe; the other path is used for periodically discharging the sludge through a second sludge discharge valve.
The diatomite has strong adsorption capacity on organic matters, algae and the like of micro flocs in a water body, and has good filterability and chemical stability. Most of the organic pollutants with the micro flocs in the water are negatively charged, and the diatomite has strong adsorption capacity. Diatomite is added into the sedimentation tank and the sludge flows back, so that the concentration of suspended matters in the inlet water is increased, the particle and collision probability of flocs is increased, the particle size of the flocs is increased, the sedimentation performance of the flocs is improved, the adsorption effect of the diatomite on organic micro flocs, algae and the like is fully utilized, and the quality of the produced water is improved. By utilizing the characteristic of the diatomite, suspended matters which are difficult to remove by the conventional coagulation sedimentation process in water are removed, the diatomite is in a loose state, the sedimentation performance of sludge is improved, the operation load is improved, the occupied area is reduced, the effluent quality of a sedimentation tank system is improved, and the operation stability of the sedimentation tank is ensured.
In order to improve the removal effect of the grid flocculation sedimentation tank on organic pollutants in the inlet water, improve the operation load, save the investment and reduce the occupied area, diatomite is added into the inlet water of the grid flocculation sedimentation tank, and the sludge is refluxed. The diatomite is in a loose state, so that organic pollutants can be prevented from being adhered to the inclined plate and not easily sliding off after being precipitated in the inclined plate precipitation area of the grid pool, and the precipitation effect is improved. The utilization rate of the diatomite is improved by utilizing the sludge backflow, and the dosage is saved. The dosage of the flocculating agent and the coagulant aid is saved. Meanwhile, the problem of corrosivity of large-scale rotating equipment of the sedimentation tank in other forms due to overhigh salt content of inlet water is solved, and particularly when raw water is seawater desalination or high-salt wastewater in the chemical industry, the large-scale rotating equipment (such as a mud scraper and the like) of the flocculation tank is severely corroded.
The inlet tube between the water outlet of the first flowmeter and the water inlet of the tee joint is provided with a first thermometer for measuring the temperature of incoming water, one end of the inlet tube close to the mesh flocculation sedimentation tank body is provided with a second thermometer for measuring the temperature of the incoming water after being mixed with return sludge, when the two temperature difference values are large (exceeding 3 ℃) in a short time, the temperature difference of the incoming water can be reduced by adjusting the flow of the return sludge, and the tank turning is avoided to influence the treatment effect.
The invention has the following advantages:
(1) the diatomite has negative electricity on most organic pollutants, humic acid, lignin and the like in water, and has strong adsorption capacity on the diatomite, and meanwhile, the diatomite also has strong adsorption capacity on algae in water. Therefore, organic pollutants, humic acid, lignin, algae and other pollutants which cannot be removed by the conventional grid flocculation sedimentation tank can be removed by adding the diatomite, and the water quality of the produced water is greatly improved;
(2) and a second dosing point for adding a flocculating agent or a coagulant aid is arranged at the flocculation section of the grid flocculation sedimentation tank, the flocculation effect of pollutants in raw water is further enhanced by adding the flocculating agent or the coagulant aid, and large-particle alum flocs are formed by taking diatomite particles as cores, so that the sedimentation is easy and the large-particle alum flocs are removed by sludge discharge. The returned sludge containing the diatomite contains the returned flocculating agent or coagulant aid, so that the adding amount of the flocculating agent or coagulant aid in the flocculation area of the grid flocculation sedimentation tank can be saved, and the adding amount is saved;
(3) sludge precipitated in the grid flocculation sedimentation tank enters a sludge circulation tank through a sludge discharge pipe branch, a first sludge discharge valve and a main sludge discharge pipe, the sludge circulation tank is provided with a first dosing point for adding diatomite, and a stirring device is arranged in the tank and has 2 functions, wherein the sludge in the sludge circulation tank is prevented from precipitating, and the added diatomite is uniformly mixed and added; the diatomite dry powder is directly added and uniformly stirred in the tank, so that the cost of medicament adding equipment is saved;
(4) the diatomite is in a loose state, and can improve the precipitation performance of the sludge.
(5) The sludge-water mixture in the sludge circulating tank is lifted by a variable-frequency adjusting sludge lifting pump and is conveyed by a sludge conveying pipe, the sludge conveying pipe is divided into two paths, and one path of sludge conveying pipe is mixed with raw water by a sludge return pipe and then enters a grid flocculation sedimentation tank; the other path is used for periodically or continuously discharging the sludge through a sludge conveying pipe and a second sludge discharge valve. The online automatic adjustment can be realized, and the automation degree is high.
(6) Through measuring the temperature after the temperature of the incoming water and the incoming water are mixed with the return sludge, when the temperature difference of the incoming water is large in a short time, the flow of the return sludge is adjusted to reduce the temperature difference of the incoming water, and the influence of tank turnover on the treatment effect can be avoided.
Drawings
FIG. 1 is a structural diagram of an embodiment 1 of a mesh flocculation sedimentation tank added with diatomite;
FIG. 2 is a structural diagram of an embodiment 2 of a mesh flocculation sedimentation tank added with diatomite;
FIG. 3 is a structural diagram of an embodiment 3 of a mesh flocculation sedimentation tank added with diatomite.
Reference numerals:
1. a mesh flocculation sedimentation tank; 11. a mesh flocculation sedimentation tank body; 111. a flocculation zone; 112. a settling zone; 12. a water inlet pipe; 13. a water production pipe; 14. a main sludge discharge pipe; 15. a first mud valve; 16. a second dosing point; 17. a first flow meter; 18. a turbidity meter; 19. a tee joint; 1a, a first thermometer; 1b, a second thermometer; 2. a water producing pool; 3. a sludge circulation tank; 31. a sludge circulating tank body; 32. a first dosing point; 33. a sludge conveying pipe; 34. a sludge lift pump; 35. a sludge return pipe; 36. a second sludge discharge valve; 37. a stirring device; 38. a sludge reflux valve; 39. a second flow meter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in figure 1, the mesh flocculation sedimentation tank for adding diatomite comprises a mesh flocculation sedimentation tank 1, a water production tank 2 and a sludge circulation tank 3 which are connected with the mesh flocculation sedimentation tank 1.
The grid flocculation sedimentation tank 1 comprises a grid flocculation sedimentation tank body 11, and the grid flocculation sedimentation tank body 11 comprises a flocculation area 111 and a sedimentation area 112 arranged in the drainage direction of the flocculation area 111;
the grid flocculation sedimentation tank 1 further comprises a water inlet pipe 12 arranged on one side of the tank body 11 of the grid flocculation sedimentation tank, a water production pipe 13 arranged on the upper part of the tank body 11 of the grid flocculation sedimentation tank and opposite to the water inlet pipe 12, a main sludge discharge pipe 14 formed by gathering a plurality of sludge discharge pipe branches and arranged at the bottom of the tank body 11 of the grid flocculation sedimentation tank, and a first sludge discharge valve 15 arranged on the main sludge discharge pipe 14; the water outlet of the water production pipe 13 is connected with the water production pool 2, and the sludge outlet of the main sludge discharge pipe 14 is connected with the sludge circulation pool 3; the water inlet pipe 12 is connected with the upper part of the flocculation area 111, the water production pipe 13 is connected with the upper part of the sedimentation area 112, and the main sludge discharge pipe 14 is connected with the bottoms of the flocculation area 111 and the sedimentation area 112 through sludge discharge pipe branches;
the sludge circulating tank 3 comprises a sludge circulating tank body 31, a first dosing point 32 arranged at the upper part of the sludge circulating tank body 31, a sludge conveying pipe 33 arranged at one side of the lower part of the sludge circulating tank body 31 opposite to the main sludge discharge pipe 14, a sludge lifting pump 34 arranged on the sludge conveying pipe 33, a sludge return pipe 35 communicated with the middle part of the sludge conveying pipe 33 and a second sludge discharge valve 36 arranged at the tail end of the sludge conveying pipe 33; the first dosing point 32 is used for dosing diatomite, and a sludge discharge port of the sludge return pipe 35 is communicated with the middle part of the water inlet pipe 12 and used for returning the diatomite-containing sludge to the grid flocculation sedimentation tank 1.
Raw water enters a mesh flocculation sedimentation tank body 11 through a water inlet pipe 12, return sludge added with diatomite enters the mesh flocculation sedimentation tank body 11 together with the raw water, the return sludge containing diatomite is uniformly mixed with the raw water in a pipeline of the water inlet pipe 12, and the adsorption and coagulation effects of the return sludge on pollutants in the sewage are fully exerted after the return sludge enters the mesh flocculation sedimentation tank body 11;
after raw water is treated by the grid flocculation sedimentation tank 1, supernatant enters the water production tank 2 through a water production pipe 13; the precipitated sludge enters a sludge circulating tank 3 through a first sludge discharge valve 15 and a main sludge discharge pipe 14, the sludge circulating tank 3 comprises a sludge circulating tank body 31 and a first dosing point 32 for adding diatomite, the diatomite is directly added and uniformly stirred in the sludge circulating tank body 31, and medicament adding equipment is saved; the mud-water mixture in the sludge circulating tank body 31 is lifted by a sludge lifting pump 34 regulated by frequency conversion and conveyed by a sludge conveying pipe 33, the sludge conveying pipe 33 is divided into two paths, and one path is mixed with raw water by a sludge return pipe 35 and then enters the mesh flocculation sedimentation tank 1; the other path is to periodically discharge the sludge through a second sludge discharge valve 36.
Example 2
As shown in figure 2, the mesh flocculation sedimentation tank for adding diatomite comprises a mesh flocculation sedimentation tank 1, a water production tank 2 and a sludge circulation tank 3 which are connected with the mesh flocculation sedimentation tank 1.
The mesh flocculation sedimentation tank 1 comprises a mesh flocculation sedimentation tank body 11, and the mesh flocculation sedimentation tank body 11 comprises a flocculation area 111 and a sedimentation area 112 arranged in the drainage direction of the flocculation area 111;
the grid flocculation sedimentation tank 1 further comprises a water inlet pipe 12 arranged on one side of the tank body 11 of the grid flocculation sedimentation tank, a water production pipe 13 arranged on the upper part of the tank body 11 of the grid flocculation sedimentation tank and opposite to the water inlet pipe 12, a main sludge discharge pipe 14 arranged at the bottom of the tank body 11 of the grid flocculation sedimentation tank and formed by gathering a plurality of sludge discharge pipe branches, a first sludge discharge valve 15 arranged on the main sludge discharge pipe 14 and a second dosing point 16 extending into the flocculation area 111 and used for dosing a flocculating agent or a coagulant aid; the water outlet of the water production pipe 13 is connected with the water production pool 2, and the sludge outlet of the main sludge discharge pipe 14 is connected with the sludge circulation pool 3; the water inlet pipe 12 is connected with the upper part of the flocculation area 111, the water production pipe 13 is connected with the upper part of the sedimentation area 112, and the main sludge discharge pipe 14 is connected with the bottoms of the flocculation area 111 and the sedimentation area 112 through sludge discharge pipe branches;
the sludge circulating tank 3 comprises a sludge circulating tank body 31, a first dosing point 32 arranged at the upper part of the sludge circulating tank body 31, a sludge conveying pipe 33 arranged at one side of the lower part of the sludge circulating tank body 31 opposite to the main sludge discharge pipe 14, a sludge lifting pump 34 arranged on the sludge conveying pipe 33, a sludge return pipe 35 communicated with the middle part of the sludge conveying pipe 33 and a second sludge discharge valve 36 arranged at the tail end of the sludge conveying pipe 33; the first dosing point 32 is used for dosing diatomite, a sludge discharge port of the sludge return pipe 35 is communicated with the middle part of the water inlet pipe 12, and the sludge return pipe 35 is used for returning the diatomite-containing sludge to the grid flocculation sedimentation tank 1.
Raw water enters a grid flocculation sedimentation tank body 11 through a water inlet pipe 12, return sludge added with diatomite and the raw water enter the grid flocculation sedimentation tank body 11 together, return sludge containing diatomite is uniformly mixed with the raw water in a pipeline of the water inlet pipe 12 and enters the grid flocculation sedimentation tank body 11 to fully play the adsorption and condensation effects of the return sludge on pollutants in sewage, a second dosing point 16 added with a flocculating agent or a coagulant aid is arranged in a flocculation area 111 of the grid flocculation sedimentation tank, the flocculation effect of the pollutants in the raw water is further enhanced by adding the flocculating agent or the coagulant aid, large-particle alum flowers are formed by taking particles of the diatomite as cores, the sedimentation is easy, and the large-particle alum flowers are removed through sludge discharge. The returned sludge containing the diatomite contains the returned flocculating agent or coagulant aid, so that the dosage of the 111 flocculating agent or coagulant aid in the flocculation area of the grid flocculation sedimentation tank can be saved, and the dosage is saved;
after raw water is treated by the grid flocculation sedimentation tank 1, supernatant enters the water production tank 2 through a water production pipe 13; the precipitated sludge enters a sludge circulating tank 3 through a first sludge discharge valve 15 and a main sludge discharge pipe 14, the sludge circulating tank 3 comprises a sludge circulating tank body 31 and a first dosing point 32 for adding diatomite, the diatomite is directly added and uniformly stirred in the sludge circulating tank body 31, and medicament mixing equipment is saved; the mud-water mixture in the sludge circulating tank body 31 is lifted by a sludge lifting pump 34 regulated by frequency conversion and conveyed by a sludge conveying pipe 33, the sludge conveying pipe 33 is divided into two paths, and one path is mixed with raw water by a sludge return pipe 35 and then enters the mesh flocculation sedimentation tank 1; the other path is to periodically discharge the sludge through a second sludge discharge valve 36.
Example 3
As shown in figure 3, the mesh flocculation sedimentation tank for adding the diatomite comprises a mesh flocculation sedimentation tank 1, a water production tank 2 and a sludge circulation tank 3 which are connected with the mesh flocculation sedimentation tank 1.
The grid flocculation sedimentation tank 1 comprises a grid flocculation sedimentation tank body 11, and the grid flocculation sedimentation tank body 11 comprises a flocculation area 111 and a sedimentation area 112 arranged in the drainage direction of the flocculation area 111;
the grid flocculation sedimentation tank 1 further comprises a water inlet pipe 12 arranged on one side of a tank body 11 of the grid flocculation sedimentation tank, a first flowmeter 17 and a turbidity meter 18 are arranged on the water inlet pipe 12, a water outlet of the first flowmeter 17 is arranged at one end of a water inlet of the turbidity meter 18, a tee joint 19 is arranged on the water inlet pipe 12 between the first flowmeter 17 and the turbidity meter 18, and the water inlet pipe 12 is connected with a flocculation area 111; a first thermometer 1a is arranged on the water inlet pipe 12 between the water outlet of the first flowmeter 17 and the water inlet of the tee joint 19, a second thermometer 1b is arranged at one end of the water inlet pipe 12 close to the mesh flocculation sedimentation tank body 11, and the first thermometer 1a and the second thermometer 1b are used for measuring the inlet water temperature difference.
The grid flocculation sedimentation tank 1 further comprises a water production pipe 13 arranged on one side of the upper part of the tank body 11 of the grid flocculation sedimentation tank opposite to the water inlet pipe 12, a main sludge discharge pipe 14 which is arranged at the bottom of the tank body of the grid flocculation sedimentation tank and formed by gathering a plurality of sludge discharge pipe branches together, a first sludge discharge valve 15 arranged on the main sludge discharge pipe 14 and a second dosing point 16 which extends into the flocculation area 111 and is used for putting a flocculating agent or a coagulant aid, the water outlet of the water production pipe 13 is connected with the water production tank 2, and the sludge outlet of the main sludge discharge pipe 14 is connected with the sludge circulation tank 3; the water inlet pipe 12 is connected with the upper part of the flocculation area 111, the water production pipe 13 is connected with the upper part of the sedimentation area 112, and the main sludge discharge pipe 14 is connected with the bottoms of the flocculation area 111 and the sedimentation area 112 through sludge discharge pipe branches;
the sludge circulating tank 3 comprises a sludge circulating tank body 31 and a first dosing point 32 arranged at the upper part of the sludge circulating tank body 31, wherein the first dosing point 32 is used for dosing diatomite, and the diatomite is diatomite dry powder; a sludge conveying pipe 33 arranged at one side of the lower part of the sludge circulating tank body 31 opposite to the main sludge discharge pipe 14, a sludge lifting pump 34 arranged on the sludge conveying pipe 33, a sludge return pipe 35 communicated with the middle part of the sludge conveying pipe 33, wherein a sludge discharge port of the sludge return pipe 35 is communicated with the middle part of the water inlet pipe 12, and a sludge discharge port of the sludge return pipe 35 is connected to a tee joint 19 and is used for returning sludge containing diatomite, a flocculating agent or a coagulant aid to the grid flocculation sedimentation tank body 11; the sludge circulating tank 3 further comprises a second sludge discharge valve 36 arranged at the tail end of the sludge conveying pipe 33, a stirring device 37 arranged inside the tank body 31 of the sludge circulating tank, a sludge return valve 38 arranged at the sludge inlet end of the sludge return pipe 35, and a second flowmeter 39 arranged on the sludge return pipe 35; the inlet of the second flowmeter 39 is arranged at one end of the outlet of the sludge return valve 38.
Raw water enters a grid flocculation sedimentation tank body 11 through a water inlet pipe 12, return sludge added with diatomite and the raw water enter the grid flocculation sedimentation tank body 11 together, return sludge containing diatomite is uniformly mixed with the raw water in a pipeline of the water inlet pipe 12 and enters the grid flocculation sedimentation tank body 11 to fully play the adsorption and condensation effects of the return sludge on pollutants in sewage, a second dosing point 16 added with a flocculating agent or a coagulant aid is arranged in a flocculation area 111 of the grid flocculation sedimentation tank, the flocculation effect of the pollutants in the raw water is further enhanced by adding the flocculating agent or the coagulant aid, large-particle alum flowers are formed by taking particles of the diatomite as cores, the sedimentation is easy, and the large-particle alum flowers are removed through sludge discharge. The returned sludge containing the diatomite contains the returned flocculating agent or coagulant aid, so that the dosage of the 111 flocculating agent or coagulant aid in the flocculation area of the grid flocculation sedimentation tank can be saved, and the dosage is saved; the water inlet pipe is provided with a first flowmeter 17 and a turbidity meter 18, and the return flow of return sludge of the diatomite is adjusted according to the flow of inlet water and the turbidity of mixed water;
the temperature of the incoming water and the temperature of the mixed incoming water and returned sludge are measured by the first thermometer 1a and the second thermometer 1b, and when the temperature difference between the incoming water and the returned sludge is large in a short time, the temperature difference is reduced by adjusting the flow of the returned sludge, so that the influence of tank turnover on the treatment effect can be avoided.
After raw water is treated by the grid flocculation sedimentation tank 1, supernatant enters the water production tank 2 through a water production pipe 13; the precipitated sludge enters a sludge circulating tank 3 through a sludge discharge pipe branch, a first sludge discharge valve 15 and a main sludge discharge pipe 14, the sludge circulating tank 3 comprises a sludge circulating tank body 31 and a first dosing point 32 for adding diatomite, a stirring device 37 is arranged in the sludge circulating tank body 31, and the stirring device has 2 functions, namely, the sludge in the sludge circulating tank body 31 is prevented from precipitating, and the added diatomite is uniformly mixed; the diatomite dry powder is directly added and uniformly stirred in the sludge circulating tank body 31, so that the medicament adding equipment is saved; the mud-water mixture in the sludge circulating tank body 31 is lifted by a sludge lifting pump 34 regulated by frequency conversion and conveyed by a sludge conveying pipe 33, the sludge conveying pipe 33 is divided into two paths, one path of the sludge conveying pipe 33 is used for mixing the sludge with raw water through a sludge return pipe 35 by a sludge return valve 38 and then enters the grid flocculation sedimentation tank 1, and the sludge return pipe 35 is provided with a second flowmeter 39; the other path is to periodically discharge the sludge through a second sludge discharge valve 36.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides an add net flocculation and precipitation pond of throwing diatomaceous earth which characterized in that: comprises a grid flocculation sedimentation tank (1), a water production tank (2) and a sludge circulation tank (3) which are connected with the grid flocculation sedimentation tank (1);
the mesh flocculation sedimentation tank (1) comprises a mesh flocculation sedimentation tank body (11), a water inlet pipe (12) arranged on one side of the mesh flocculation sedimentation tank body (11), a water production pipe (13) arranged on one side, opposite to the water inlet pipe (12), of the upper part of the mesh flocculation sedimentation tank body (11), a main sludge discharge pipe (14) formed by gathering a plurality of sludge discharge pipe branches and arranged at the bottom of the mesh flocculation sedimentation tank body (11), and a first sludge discharge valve (15) arranged on the main sludge discharge pipe (14); the water outlet of the water production pipe (13) is connected with the water production pool (2), and the sludge outlet of the main sludge discharge pipe (14) is connected with the sludge circulation pool (3); the mesh flocculation sedimentation tank body (11) comprises a flocculation area (111) and a sedimentation area (112) arranged in the drainage direction of the flocculation area (111), the water inlet pipe (12) is connected with the upper part of the flocculation area (111), the water production pipe (13) is connected with the upper part of the sedimentation area (112), and the main sludge discharge pipe (14) is connected with the flocculation area (111) and the bottom of the sedimentation area (112) through a sludge discharge pipe branch;
the sludge circulating tank (3) comprises a sludge circulating tank body (31), a first dosing point (32) arranged at the upper part of the sludge circulating tank body (31), a sludge conveying pipe (33) arranged at the lower part of the sludge circulating tank body (31) and opposite to the main sludge discharge pipe (14), a sludge lifting pump (34) arranged on the sludge conveying pipe (33), a sludge return pipe (35) communicated with the middle part of the sludge conveying pipe (33) and a second sludge discharge valve (36) arranged at the tail end of the sludge conveying pipe (33); the first dosing point (32) is used for dosing diatomite, and a sludge discharge port of the sludge return pipe (35) is communicated with the middle of the water inlet pipe (12) and used for returning the diatomite-containing sludge to the grid flocculation sedimentation tank (1).
2. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 1, which is characterized in that: the grid flocculation sedimentation tank (1) further comprises a second dosing point (16) which extends into the flocculation area (111) and is used for throwing a flocculating agent or a coagulant aid, and the sludge return pipe (35) is used for returning sludge containing the flocculating agent or the coagulant aid to the grid flocculation sedimentation tank body (11).
3. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 1, which is characterized in that: and a stirring device (37) is arranged in the sludge circulating tank body (31).
4. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 1, which is characterized in that: the water inlet pipe (12) is provided with a first flowmeter (17) and a turbidity meter (18).
5. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 4, wherein: the water outlet of the first flowmeter (17) is arranged at one end of the water inlet of the turbidity meter (18).
6. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 5, wherein: a tee joint (19) is arranged on the water inlet pipe (12) between the first flowmeter (17) and the turbidity meter (18), and a sludge discharge port of the sludge return pipe (35) is connected to the tee joint (19); a first thermometer (1a) is arranged on the water inlet pipe (12) between the water outlet of the first flowmeter (17) and the water inlet of the tee joint (19), a second thermometer (1b) is arranged at one end, close to the mesh flocculation sedimentation tank body (11), of the water inlet pipe (12), and the first thermometer (1a) and the second thermometer (1b) are used for measuring the water inlet temperature difference.
7. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 1, which is characterized in that: and a sludge return valve (38) is arranged at one end of the sludge return pipe (35) where sludge comes.
8. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 7, wherein: the sludge return pipe (35) is also provided with a second flowmeter (39).
9. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 8, wherein: the water inlet of the second flowmeter (39) is arranged at one end of the water outlet of the sludge return valve (38).
10. The mesh flocculation sedimentation tank added with diatomite as claimed in claim 1, which is characterized in that: the diatomite is diatomite dry powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010689571.6A CN111777147A (en) | 2020-07-17 | 2020-07-17 | Add net flocculation sedimentation tank of throwing diatomaceous earth |
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| CN202010689571.6A CN111777147A (en) | 2020-07-17 | 2020-07-17 | Add net flocculation sedimentation tank of throwing diatomaceous earth |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112299670A (en) * | 2020-11-28 | 2021-02-02 | 深圳市东荣环保科技有限公司 | Aquaculture sewage treatment system |
| CN113480052A (en) * | 2021-08-16 | 2021-10-08 | 临江市大塬硅藻土新材料生态环保科技有限公司 | Diatomite papermaking sewage treatment equipment and treatment method |
| CN113582385A (en) * | 2021-07-29 | 2021-11-02 | 中冶华天南京工程技术有限公司 | Method for quickly cleaning and purifying small algae-rich water |
-
2020
- 2020-07-17 CN CN202010689571.6A patent/CN111777147A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112299670A (en) * | 2020-11-28 | 2021-02-02 | 深圳市东荣环保科技有限公司 | Aquaculture sewage treatment system |
| CN113582385A (en) * | 2021-07-29 | 2021-11-02 | 中冶华天南京工程技术有限公司 | Method for quickly cleaning and purifying small algae-rich water |
| CN113480052A (en) * | 2021-08-16 | 2021-10-08 | 临江市大塬硅藻土新材料生态环保科技有限公司 | Diatomite papermaking sewage treatment equipment and treatment method |
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