CN210764812U - Zero release processing system of optic fibre waste water - Google Patents

Abstract

The utility model provides a zero-discharge treatment system for optical fiber production wastewater, comprising: a homogeneous adjustment tank, a reaction device, a concentration tank, a microfiltration device, a water production tank, a concentration reduction device, an evaporation device, a sludge concentration tank, and a sludge concentration tank. drying device. The utility model can reuse more than 80% of the water in the optical fiber production wastewater through the combination of "reaction device + microfiltration device + concentration reduction device + evaporation device"; by setting the reaction device as a first reaction tank and a second reaction tank At the same time, the bottoms of the first reaction tank and the second reaction tank are set to a conical structure, which can effectively form the precipitation of magnesium hydroxide and calcium carbonate in the first reaction tank and the second reaction tank, and at the same time arrange micro The filter device can effectively reduce the dosage of sodium hydroxide and sodium carbonate, further reduce the treatment cost, and also improve the concentration effect of magnesium hydroxide and calcium carbonate, without the need for additional sedimentation tanks, reducing the footprint of the system.

Description

A zero-discharge treatment system for optical fiber production wastewater

technical field

The utility model belongs to the technical field of water treatment, in particular to a zero-discharge treatment system for optical fiber production wastewater.

Background technique

With the development of my country's optical fiber communication industry, the production of optical fiber, which is the most basic component, is also developing rapidly. The wastewater treatment in the optical fiber production process is generally used as a supporting project for the optical fiber tail gas purification project. The exhaust gas from optical fiber production contains not only SiO ₂ dust with extremely fine particle size, but also highly corrosive substances such as HCl, HF and Cl ₂ . After the optical fiber tail gas is treated by water spray, electrostatic precipitator and alkali liquid absorption, the tail gas is discharged up to the standard. The harmful substances in the exhaust gas will form hydrochloric acid, hypochlorous acid, hydrofluoric acid and silica colloidal substances in the water after being absorbed by spraying and lye. Optical fiber wastewater mainly comes from the discharge water from the exhaust gas treatment of optical fiber production. The main sources are acid water discharged from spray towers, electrostatic precipitators and a small amount of waste lye discharged from absorption towers.

The pollutants in optical fiber wastewater are mainly inorganic substances, which belong to the category of inorganic wastewater. Optical fiber wastewater has the following characteristics: 1) The particle size of SiO ₂ in wastewater is extremely fine, with a particle size of 0.05-0.3 μm, which belongs to colloidal particles. The colloidal particles in water have the characteristics of Brownian motion and have an electric double layer. In the colloidal solution, the particles of the same kind are charged with the same charge and repel each other. They cannot bond with each other in water and are in a relatively stable state. Therefore, the colloidal particles are very stable in water and are not easy to settle down; 2) The fiber waste water contains a small amount of F ^- , Although the initial concentration does not exceed the standard, due to the recycling of 95% of the treated water, the F ^- concentration in the wastewater is continuously enriched, and the F ^- concentration continues to increase, which will not only cause the F ^- in the discharged wastewater to exceed the standard, but also affect the exhaust gas treatment process. Absorption of HF. Therefore, the F ^- in wastewater must be treated; 3) The high hardness causes the scaling of the MVR system, the terminal treatment process of the wastewater "zero discharge" system, and affects its long-term stable operation.

In view of the above-mentioned wastewater characteristics, the wastewater treatment process is mainly the sedimentation of SiO ₂ colloid, the removal of F ^- and the removal of calcium and magnesium ions. To settle the SiO ₂ colloidal particles, it is generally necessary to add an oppositely charged coagulant to the wastewater to destabilize the colloid, and the destabilized particles in the wastewater collide with each other and further aggregate together by the van der Waals force. In order to make the aggregated particles easy to settle, a flocculant should be added to the solution, and the bridging effect of the flocculant is used to promote the further aggregation of small-sized particles into large particles and precipitation. For F ^- , calcium method is generally used to remove fluorine, that is, F ^- is removed by F ^- and Ca ²⁺ to form CaF ₂ precipitation. The formation of CaF ₂ has a great relationship with the pH value of the reaction, the coagulation reaction time, the amount of calcium salt added, and the factors that promote the growth of CaF _2. The optimal pH value for the formation of CaF ₂ is about 8, and the coagulation reaction time is about It takes 30 minutes. The amount of calcium salt added cannot be added according to the theoretically calculated amount, because the wastewater itself is a complex system, and there are often interferences of various ions. In order to increase the small CaF ₂ crystals, a flocculant needs to be added, and a coagulation aid needs to be added to speed up the precipitation. After the calcium defluorination treatment, the effluent F can generally only reach about 20mg ^/ L. In order to ensure that the discharged water effluent meets the standard, it must be strengthened by treatment - such as TMF strengthened softening treatment. According to the characteristics of optical fiber wastewater, PAC and PAM are selected as dosing agents. They can not only be used as flocculants and coagulants for fluorine-containing wastewater treatment, but also as coagulants and flocculants for SiO ₂ colloids to neutralize the negative charges of colloids. At the same time, it acts as a bridge, and the small particle flocs formed after coagulation are bridged into large particles, which are easy to precipitate.

Utility model content

Therefore, the purpose of this utility model is to provide a synergistic recovery system of iron-containing waste acid.

For this reason, the above-mentioned purpose of the present utility model is achieved through the following technical solutions:

A zero-discharge treatment system for optical fiber production wastewater, the zero-discharge treatment system for optical fiber production wastewater is used to treat communication optical fiber production wastewater, including:

- Homogeneous conditioning tank, which is used for homogenizing and mixing the communication optical fiber production wastewater entering the optical fiber production wastewater zero-discharge treatment system;

- a reaction device, the inlet of the reaction device is communicated with the outlet of the homogeneous conditioning tank, and is used for the reaction treatment of the optical fiber production wastewater from the homogeneous conditioning tank, so as to separate silica and fluoride ions from the optical fiber production wastewater;

- a concentration tank, which is communicated with the upper water outlet of the reaction device,

- a microfiltration device in communication with the upper water outlet of the concentration tank,

- a water production tank, which is communicated with the water production outlet of the microfiltration device,

- Concentration and weight reduction device, the inlet of the concentration and weight reduction device is communicated with the outlet of the water production tank;

- an evaporation device, the inlet of the evaporation device is communicated with the concentrated water outlet of the concentration reduction device;

- a sludge thickening tank, the inlet of which communicates with the sludge outlet at the bottom of the reaction device; and

- a sludge drying device, the inlet of the sludge drying device is communicated with the outlet of the sludge thickening tank.

While adopting the above scheme, the present utility model can also adopt or combine the following technical schemes:

As a preferred solution of the present invention, the reaction device includes a first reaction tank and a second reaction tank connected in series, and the lower water outlet of the first reaction tank is communicated with the second reaction tank; the first reaction tank There is a first feeding port on it, and the first feeding port is used to add calcium hydroxide and magnesium chloride into the first reaction tank, and the second reaction tank is provided with a second feeding port, and the first feeding port is used for adding calcium hydroxide and magnesium chloride to the first reaction tank. The second feeding port is used for adding sodium hydroxide and sodium carbonate into the second reaction tank; the bottoms of the first reaction tank and the second reaction tank are both provided with sludge outlets, and both are connected to the sludge thickening tank.

As a preferred solution of the present invention, a mechanical stirrer is provided in the first reaction tank and the second reaction tank to enhance the reaction effect in the first and second reaction tanks.

As a preferred solution of the present invention, the bottoms of the first and second reaction tanks are conical structures, and the conical bottoms of the first and second reaction tanks are respectively provided with a sludge outlet, and the sludge outlet is connected to the sludge outlet. A pneumatic diaphragm pump is provided on the connecting pipeline between the mud concentration tanks.

As a preferred solution of the present invention, the bottom of the concentration tank is a conical structure, the conical bottom of the concentration tank is provided with a sludge outlet, and the connecting pipeline between the sludge outlet and the sludge concentration tank is provided with a sludge outlet. Air operated diaphragm pump.

As a preferred solution of the present invention, the microfiltration device is a tubular microfiltration membrane device, and an acid feeding port is provided on the connecting pipeline between the tubular microfiltration membrane device and the water production tank.

As a preferred solution of the present invention, the connecting pipeline is provided with a pH meter and a hardness detector between the acid feeding port and the water production tank.

As a preferred solution of the present invention, the concentration and weight reduction device is a high-pressure reverse osmosis device, and the high-pressure reverse osmosis device includes a roll-type reverse osmosis device or a disk-type reverse osmosis device.

As a preferred solution of the present invention, the sludge drying device is a plate and frame filter press, a disc screw type sludge dewatering machine or a vacuum belt conveyor.

As a preferred solution of the present invention, the evaporation device is an MVR evaporator.

The utility model provides a zero-discharge treatment system for optical fiber production wastewater, which has the following beneficial effects:

(1) Through the combination of "reaction device + microfiltration device + concentration reduction device + evaporation device", more than 80% of the water in the optical fiber production wastewater can be reused;

(2) By setting the reaction device as a first reaction tank and a second reaction tank, and at the same time setting the bottoms of the first reaction tank and the second reaction tank into a conical structure, it is possible to effectively form magnesium hydroxide and calcium carbonate in the The precipitation in the first reaction tank and the second reaction tank, and the arrangement of the microfiltration device at the same time can effectively reduce the dosage of sodium hydroxide and sodium carbonate, further reduce the processing cost, and can also improve the concentration of magnesium hydroxide and calcium carbonate Effectively, there is no need to arrange additional sedimentation tanks, reducing the footprint of the system.

(3) By arranging the high-pressure reverse osmosis device, the concentration of TDS in the wastewater can be increased, the concentration and weight reduction treatment of the wastewater can be realized, the processing capacity of the back-end MVR evaporator can be reduced, and the investment and operation cost of the MVR evaporator can be reduced;

(4) The MVR evaporator used in the present invention does not require high-energy-consumption steam evaporation treatment when treating waste water, and can also improve the economy of waste water evaporation.

Description of drawings

FIG. 1 is a schematic diagram of a zero-discharge treatment system for optical fiber production wastewater provided by the present invention.

Detailed ways

The present utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.

A zero-discharge treatment system for optical fiber production wastewater, used for the treatment of communication optical fiber production wastewater, including:

- Homogeneous conditioning tank 110, which is used to homogenize and mix the communication optical fiber production wastewater entering the optical fiber production wastewater zero-discharge treatment system;

- a reaction device, the inlet of the reaction device is communicated with the outlet of the homogeneous conditioning tank 110, and is used to react and treat the optical fiber production wastewater from the homogeneous conditioning tank 110, so as to separate silica and fluoride ions from the optical fiber production wastewater;

In this embodiment, the reaction device is preferably arranged to include a first reaction tank 121 and a second reaction tank 122 connected in series, and the lower water outlet of the first reaction tank 121 is communicated with the second reaction tank 122; the first reaction tank 121 There is a first feeding port 121a, the first feeding port 121a is used to add calcium hydroxide and magnesium chloride to the first reaction tank 121, the second reaction tank 122 is provided with a second feeding port 122a, the second The dosing port 122a is used to add sodium hydroxide and sodium carbonate to the second reaction tank 122; the bottoms of the first reaction tank 121 and the second reaction tank 122 are provided with sludge outlets, and both are connected to the sludge concentration tank 180, the first reaction tank 121 and the second reaction tank 122 are equipped with mechanical stirrers to strengthen the reaction effect in the first and second reaction tanks 122, and the bottoms of the first and second reaction tanks 122 are conical structures , the conical bottoms of the first and second reaction tanks 122 are respectively provided with a sludge outlet, and a pneumatic diaphragm pump is provided on the connecting pipeline between the sludge outlet and the sludge concentration tank 180;

- the concentration tank 130, the concentration tank 130 is communicated with the upper water outlet of the reaction device, in this embodiment, the bottom of the concentration tank 130 is a conical structure, the conical bottom of the concentration tank is provided with a sludge outlet, and the sludge outlet A pneumatic diaphragm pump is provided on the connecting pipeline with the sludge thickening tank 180;

- Microfiltration device 140, the microfiltration device 140 is communicated with the upper water outlet of the concentration tank 130, in this embodiment, the microfiltration device is a tubular microfiltration membrane device, and the connection between the tubular microfiltration membrane device and the water production tank 150 There is an acid feeding port 150a on the pipeline, and a pH meter 150b and a hardness detector 150c are arranged between the acid feeding port 150a and the water production tank 150 in the connecting pipeline, and the pH meter 150b and the hardness detector 150c can be arranged in the same position. , can also be arranged in different positions,

- The water production tank 150, the water production tank 150 is communicated with the water production outlet of the microfiltration device,

- Concentration and weight reduction device 160, the inlet of the concentration and weight reduction device 160 is communicated with the outlet of the water production tank 150. In this embodiment, the concentration and weight reduction device is a high-pressure reverse osmosis device, and the high-pressure reverse osmosis device includes a roll-type reverse osmosis device or Disc type reverse osmosis device;

- Evaporation device 170, the inlet of the evaporation device 170 is communicated with the concentrated water outlet of the concentration reduction device, in this embodiment, the evaporation device is an MVR evaporator;

- a sludge thickening tank 180, the inlet of which is communicated with the bottom sludge outlet of the reaction device; and

- the sludge drying device 190, the inlet of the sludge drying device 190 is communicated with the outlet of the sludge thickening tank 180, in this embodiment, the sludge drying device 190 is a plate and frame filter press or a disc screw type sewage Mud dehydrator or vacuum belt conveyor.

The above-mentioned specific embodiments are used to explain the present utility model, and are only preferred embodiments of the present utility model, rather than limiting the present utility model. Within the spirit of the present utility model and the protection scope of the claims, Any modification, equivalent replacement, improvement, etc., all fall into the protection scope of the present invention.

Claims (10)

1. A zero-discharge treatment system for optical fiber production wastewater, characterized in that, the zero-discharge treatment system for optical fiber production wastewater is used to treat communication optical fiber production wastewater, comprising: - Homogeneous conditioning tank, which is used for homogenizing and mixing the communication optical fiber production wastewater entering the optical fiber production wastewater zero-discharge treatment system; - a reaction device, the inlet of the reaction device is communicated with the outlet of the homogeneous conditioning tank, and is used for the reaction treatment of the optical fiber production wastewater from the homogeneous conditioning tank, so as to separate silica and fluoride ions from the optical fiber production wastewater; - a concentration tank, which is communicated with the upper water outlet of the reaction device, - a microfiltration device in communication with the upper water outlet of the concentration tank, - a water production tank, which is communicated with the water production outlet of the microfiltration device, - Concentration and weight reduction device, the inlet of the concentration and weight reduction device is communicated with the outlet of the water production tank; - an evaporation device, the inlet of the evaporation device is communicated with the concentrated water outlet of the concentration reduction device; - a sludge thickening tank, the inlet of which communicates with the sludge outlet at the bottom of the reaction device; and - a sludge drying device, the inlet of the sludge drying device is communicated with the outlet of the sludge thickening tank. 2. The optical fiber production wastewater zero-discharge treatment system according to claim 1, wherein the reaction device comprises a first reaction tank and a second reaction tank connected in series, and the lower water outlet of the first reaction tank is connected to the The second reaction tank is connected; the first reaction tank is provided with a first feeding port, and the first feeding port is used for adding calcium hydroxide and magnesium chloride into the first reaction tank, and the second reaction tank is The tank is provided with a second feeding port, and the second feeding port is used to add sodium hydroxide and sodium carbonate to the second reaction tank; the bottoms of the first reaction tank and the second reaction tank are provided with The sludge outlet is connected to the sludge thickening tank. 3. The optical fiber production wastewater zero-discharge treatment system according to claim 2, wherein a mechanical stirrer is provided in the first reaction tank and the second reaction tank to strengthen the first and second reaction tanks. reaction effect. 4. The zero-discharge treatment system for optical fiber production wastewater according to claim 2, wherein the bottoms of the first and second reaction tanks are tapered structures, and the tapered bottoms of the first and second reaction tanks Sludge outlets are respectively provided, and a pneumatic diaphragm pump is arranged on the connecting pipeline between the sludge outlet and the sludge concentration tank. 5. The optical fiber production wastewater zero-discharge treatment system according to claim 1, wherein the bottom of the concentration tank is a conical structure, the conical bottom of the concentration tank is provided with a sludge outlet, and the sludge outlet A pneumatic diaphragm pump is provided on the connecting pipeline with the sludge thickening tank. 6 . The zero-discharge treatment system for optical fiber production wastewater according to claim 1 , wherein the microfiltration device is a tubular microfiltration membrane device, and a connecting pipeline between the tubular microfiltration membrane device and the water production tank is provided. There is acid added. 7 . The optical fiber production wastewater zero-discharge treatment system according to claim 6 , wherein the connecting pipeline is provided with a pH meter and a hardness detector between the acid feeding port and the water production tank. 8 . 8 . The zero-discharge treatment system for optical fiber production wastewater according to claim 1 , wherein the concentration and weight reduction device is a high-pressure reverse osmosis device, and the high-pressure reverse osmosis device comprises a roll-type reverse osmosis device or a dish-type reverse osmosis device. 9 . penetration device. 9 . The zero-discharge treatment system for optical fiber production wastewater according to claim 1 , wherein the sludge drying device is a plate and frame filter press, a disc screw type sludge dewatering machine, or a vacuum belt conveyor. 10 . 10 . The zero-discharge treatment system for optical fiber production wastewater according to claim 1 , wherein the evaporation device is an MVR evaporator. 11 .

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