CN212504439U - Treatment system for recycling high-hardness reclaimed water - Google Patents

Abstract

The utility model relates to a treatment system for recycling high-hardness reclaimed water, which comprises a biological aerated filter, a slow decarburization clarification tank, a concrete variable pore filter, an immersed ultrafiltration device and a reverse osmosis device; the aeration biological filter inlet is connected with a reclaimed water conveying pipeline, the aeration biological filter outlet is connected with the slow decarburization clarification tank inlet, the slow decarburization clarification tank outlet is connected with the concrete variable pore filter inlet, the concrete variable pore filter outlet is connected with the immersion ultrafiltration device inlet, the immersion ultrafiltration device outlet is connected with the reverse osmosis device inlet, and the reverse osmosis device outlet is connected with a power plant water system. The utility model discloses can carry out the advanced treatment to the high rigidity normal water, satisfy the reuse of reclaimed water requirement of power plant.

Description

Treatment system for recycling high-hardness reclaimed water

Technical Field

The utility model belongs to the technical field of the advanced treatment of reclaimed water in thermal power plant, especially, relate to a processing system for high rigidity reuse of reclaimed water.

Background

The reclaimed water is also called reclaimed water, and the water quality is generally used as a distinguishing mark. The quality of the reclaimed water is between that of the upper water (feed water) and the lower water (discharge water). In China, the water quality of municipal sewage treated by a series of processes reaches a certain use standard, and the municipal sewage can be reused in a certain range. In power plants, reclaimed water is often used as a source of industrial water throughout the plant. Aiming at the characteristics of a power plant, a treatment system for recycling high-hardness reclaimed water is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a processing system for high rigidity reuse of reclaimed water carries out advanced treatment through the high turbid high salinity reuse of reclaimed water to satisfy the power plant's reuse of reclaimed water requirement.

The utility model provides a treatment system for recycling high-hardness reclaimed water, which comprises a biological aerated filter, a slow decarburization clarification tank, a concrete variable pore filter, an immersed ultrafiltration device and a reverse osmosis device;

the aeration biological filter inlet is connected with a reclaimed water conveying pipeline, the aeration biological filter outlet is connected with the slow decarburization clarification tank inlet, the slow decarburization clarification tank outlet is connected with the concrete variable pore filter inlet, the concrete variable pore filter outlet is connected with the immersion ultrafiltration device inlet, the immersion ultrafiltration device outlet is connected with the reverse osmosis device inlet, and the reverse osmosis device outlet is connected with a power plant water system.

Furthermore, the biological aerated filter adopts a round ceramic filter material as a microorganism carrier.

By means of the scheme, the treatment system for recycling the high-hardness reclaimed water can carry out advanced treatment on the high-hardness reclaimed water, and meets the requirement of recycling the reclaimed water in a power plant.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of the treatment system for recycling high hardness reclaimed water of the present invention.

Reference numbers in the figures:

1-aeration biological filter; 2-slow decarburization clarifying pool; 3-a concrete variable-pore filter; 4-an immersion ultrafiltration device; 5, a reverse osmosis device; 6-power plant water system.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Referring to fig. 1, the present embodiment provides a treatment system for recycling high hardness reclaimed water, which includes a biological aerated filter 1, a slow decarburization clarification tank 2, a concrete pore-variable filter 3, an immersed ultrafiltration device 4 and a reverse osmosis device 5;

the inlet of the biological aerated filter 1 is connected with a reclaimed water conveying pipeline, the outlet of the biological aerated filter 1 is connected with the inlet of the slow decarburization clarification tank 2, the outlet of the slow decarburization clarification tank 2 is connected with the inlet of the concrete variable-pore filter 3, the outlet of the concrete variable-pore filter 3 is connected with the inlet of the immersed ultrafiltration device 4, the outlet of the immersed ultrafiltration device 4 is connected with the inlet of the reverse osmosis device 5, and the outlet of the reverse osmosis device 5 is connected with the water system 6 of the power plant.

Through the treatment system, high-hardness reclaimed water is subjected to advanced treatment sequentially through the biological aerated filter 1, the slow decarburization clarification tank 2, the concrete variable pore filter 3, the immersed ultrafiltration device 4 and the reverse osmosis device 5, so that the reclaimed water recycling requirement of a power plant can be met, and the treated reclaimed water is sent to the water system 6 of the power plant for recycling.

The system will be described in detail below.

An aeration biological filter.

The aeration biological filter is used for degrading organic matters in sewage and nitrifying ammonia nitrogen, adopts a circular ceramic filter material as a microorganism carrier in the biological filter, domesticates dominant strains with different functions, shortens biological oxidation time, improves biochemical treatment efficiency so as to adapt to the change of water quality and stabilize the treated water quality. The adopted aeration biological filter has the functions of removing SS, COD, BOD, nitrification, denitrification and removing AOX (harmful substances), and is characterized by integrating biological oxidation and suspended solid interception into a whole and saving subsequent sedimentation (secondary sedimentation tank); the volume load and the hydraulic load are large, the hydraulic retention time is short, the required capital investment is low, and the effluent quality is good; the operation energy consumption is low, and the operation cost is saved. In the operation process, oxygen is supplied by aeration at the bottom of the filter. The filter chamber is backwashed after running for a certain time; the back flushing adopts the combination of gas and water for back flushing, the back flushing sewage is discharged to a recovery water tank, and the effluent of the filter tank enters a clarification tank by gravity flow for subsequent treatment. The biological filter is mainly used for removing organic matters and ammonia nitrogen in raw water and removing the turbidity of the raw water by biological filtration. After passing through the biological filter, the stability of the sewage is improved.

Slow decarbonization clarification tank

The slow decarbonization clarification tank is sequentially provided with a condensation zone, a flocculation zone, a thrust zone and a concentration separation zone from the water inlet direction, the controllable sludge backflow is realized, and the residual sludge is sent to a filter press. Has the following advantages: the floor area can be saved by 50% to the maximum extent; the adaptability to water quality, flow and temperature change is strong; accurate pH control; controllable sludge backflow greatly improves the effluent quality and saves the use amount of medicines; fully-automatically discharging the sludge; the self-service water can be recycled and treated, and no waste water is generated; and (4) unattended operation.

Concrete variable-pore filter

The effluent of the variable-pore filter tank ensures that suspended matters are less than or equal to 5mg/L, and the inlet water of the filter tank is provided with an acid adding system to remove the supersaturated alkalinity in the effluent of the clarification tank. The acid is sulfuric acid. In addition, bactericide is added into the water inlet and the water outlet of the filter. The whole filter system is designed according to the requirements of preventing the hardening of the filter material and breeding of organic matters. The backwashing of the filter tank is designed with a forced backwashing function and is provided with a proper backwashing water tank, a backwashing water pump and a fan. The backwashing water is recovered and enters the clarification system again. The effluent of the filter tank flows into a clean water tank, and then the qualified water after advanced treatment is conveyed to a circulating water system by a circulating water replenishing pump. The filter tank is designed to distribute water uniformly, has good backwashing effect, low backwashing water consumption and stable operation, and adopts deep filtration. The filter material filled in the filter tank is natural sea sand with excellent performance, and performance indexes such as silicon content, mechanical strength and the like meet the relevant regulation.

Immersed ultrafiltration device

The ultrafiltration pressure is usually 0.02 MPa-0.30 MPa, the membrane aperture is 0.02-0.10 μm, the cut-off molecular weight is about 1000-500000 Dalton, and the method is a membrane separation technology capable of purifying, separating and concentrating the solution. An ultrafiltration process is generally understood to be a sieving process which is dependent on the pore size of the membrane, with the pressure difference across the membrane being the driving force and the ultrafiltration membrane being the filter medium. The ultrafiltration membrane can effectively remove suspended matters, colloidal particles, bacteria, most viruses and the like in water, has the removal rate of 20-60 percent for organic matters, and hardly intercepts small molecular organic matters and inorganic ions. The ultrafiltration system has high operation automation degree, small operation and maintenance workload, integrated equipment and small occupied area. The turbidity of the ultrafiltration effluent is less than 0.2NTU, and the SDI is less than 3, thus meeting the requirement of reverse osmosis influent water quality.

Reverse osmosis device

Reverse osmosis systems are commonly used in reclaimed water recycling systems, and the principle of the reverse osmosis system is that raw water passes through a membrane under the action of high pressure, and a solvent in the water diffuses from high concentration to bottom concentration so as to achieve the purposes of separation, purification and concentration. In the treatment of waste water, a reclaimed water recycling technical system is often selected and an indispensable part of the system is an RO reverse osmosis membrane system. The ultra-static pressure pump is used for high-pressure permeation, so that water molecules and ionic mineral elements pass through a reverse osmosis membrane, most heavy metals, organic matters, bacteria, viruses and the like dissolved in water cannot be trapped through the reverse osmosis membrane. Based on the principle of reverse osmosis, impurities in water, such as toxic substances of heat sources, filterable viruses, bacteria, toxins, compounds and heavy metals (arsenic, cobalt, cadmium, mercury and the like), and substances harmful to human health, such as metals, salts, free ions and the like, are separated from pure water by the reverse osmosis membrane. The reclaimed water reuse technology is characterized in that various physical, chemical, biological and other means are used for treating wastewater discharged by industry at different depths to achieve the water quality required by the process, and then the wastewater is reused in the process to save water resources.

The processing system has the following technical effects:

1. the impurity removal efficiency is high, and the quality of the produced water is greatly better than that of the traditional method;

2. the use of chemical agents is thoroughly eliminated or greatly reduced, and secondary pollution is avoided;

3. the system is easy to automate and has high reliability. The operation is simple, and the facility is only opened and closed at two gears;

4. the floor space requirement is small;

5. the cost is equivalent to that of the conventional water treatment system.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (2)

1. A treatment system for recycling high-hardness reclaimed water is characterized by comprising a biological aerated filter, a slow decarburization clarification tank, a concrete variable-pore filter, an immersed ultrafiltration device and a reverse osmosis device;

the aeration biological filter inlet is connected with a reclaimed water conveying pipeline, the aeration biological filter outlet is connected with the slow decarburization clarification tank inlet, the slow decarburization clarification tank outlet is connected with the concrete variable pore filter inlet, the concrete variable pore filter outlet is connected with the immersion ultrafiltration device inlet, the immersion ultrafiltration device outlet is connected with the reverse osmosis device inlet, and the reverse osmosis device outlet is connected with a power plant water system.

2. The treatment system for recycling high-hardness reclaimed water according to claim 1, wherein the biological aerated filter adopts a round ceramic filter material as a microorganism carrier.

Images