Softening system for high sulfate radical wastewater

Abstract

The utility model discloses a high sulfate radical wastewater softening system, including destabilization reactor, destabilization sedimentation tank, softening reaction tank, tubular membrane and water producing tank, destabilization sedimentation tank is provided in the one side of destabilization reactor, softening reaction tank is provided in the one side of destabilization sedimentation tank departing from destabilization reactor. According to the utility model, the destabilization reactor and the destabilization sedimentation tank are arranged, calcium ions in the wastewater are effectively removed by adding a destabilization agent into the destabilization reactor, the dosage of a dual-alkali method is reduced, the wastewater treatment cost is reduced, and high-purity calcium sulfate sludge generated by the destabilization reactor can be sold as a commodity, so that the sludge treatment cost is reduced; and the tubular membrane is adopted to carry out solid-liquid separation of the dual-alkali method, so that the quality of produced water is improved, and the operation of the subsequent process is more guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to high sulfate wastewater treatment technical field, specifically be a kind of high sulfate wastewater softening system. BACKGROUND

[0002] High sulfate wastewater is more common in industrial wastewater field, for example, desulfurization wastewater, pickling wastewater, high-salt wastewater generated by membrane concentration and so on.This kind of wastewater usually has higher salt content and hardness, and is usually treated by adding double-alkali reaction and then gravity precipitation.This process requires the addition of a large amount of sodium carbonate and sodium hydroxide, which is high in reagent cost, and also produces a large amount of sludge, and the treatment cost of sludge is also high, so a high sulfate wastewater softening system is needed to solve the above problems, which can effectively reduce the dosage of double-alkali method, reduce the production of softening sludge, and also reduce the salt content of wastewater, in addition, the high-purity calcium sulfate produced in the process can be sold externally. SUMMARY

[0003] The utility model aims at providing a kind of high sulfate wastewater softening system to solve the problems raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of high sulfate wastewater softening system, including destabilization reactor, destabilization sedimentation tank, softening reaction pool, tubular membrane and water production tank, the destabilization sedimentation tank is arranged in one side of the destabilization reactor, the softening reaction pool is arranged in the side of the destabilization sedimentation tank away from the destabilization reactor, the tubular membrane is arranged in the side of the softening reaction pool away from the destabilization sedimentation tank, and the water production tank is arranged in the side of the tubular membrane away from the softening reaction pool.

[0005] Preferably, a calcium sulfate sludge tank is connected to the top of the destabilization sedimentation tank, and a second dewatering machine is connected to the top of the calcium sulfate sludge tank.

[0006] Preferably, a softening sludge tank is connected to the top of the tubular membrane, and a first dewatering machine is connected to the top of the softening sludge tank.

[0007] Compared with the prior art, the utility model has the following advantages:

[0008] The utility model discloses a through setting the destabilization reactor and the destabilization sedimentation tank, the calcium ion in the wastewater is effectively removed to the mode of throwing destabilization agent in the destabilization reactor, and the dosing amount of double alkali method is reduced, and the treatment cost of wastewater is reduced, the high purity calcium sulfate sludge produced by the destabilization reactor can be sold as commodity, reduces the sludge disposal cost, and has certain economic benefits, and the solid - liquid separation of double alkali method is carried out using the tubular membrane, and the water quality of production water is improved, and the operation of subsequent process is more secure.

[0009] The utility model discloses a through setting the destabilization reactor and the destabilization sedimentation tank, the calcium ion in the wastewater is effectively removed to the mode of throwing destabilization agent in the destabilization reactor, and the dosing amount of double alkali method is reduced, and the treatment cost of wastewater is reduced, the high purity calcium sulfate sludge produced by the destabilization reactor can be sold as commodity, reduces the sludge disposal cost, and has certain economic benefits, and the solid - liquid separation of double alkali method is carried out using the tubular membrane, and the water quality of production water is improved, and the operation of subsequent process is more secure. ACCURACY OF DRAWINGS

[0010] Figure 1 It is the structural flow diagram of the utility model.

[0011] In the drawing: 1 - destabilization reactor, 2 - destabilization sedimentation tank, 3 - softening reaction tank, 4 - tubular membrane, 5 - production water pool, 6 - softening sludge tank, 7 - first dehydrator, 8 - second dehydrator, 9 - calcium sulfate sludge tank. DETAILED DESCRIPTION

[0012] The technical scheme in the embodiments of the utility model will be described below in conjunction with the drawings of the embodiments of the utility model in a clear and complete manner. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0013] Please refer to Figure 1 The utility model provides an embodiment: a kind of softening system of high sulphate wastewater, including destabilization reactor 1, destabilization sedimentation tank 2, softening reaction tank 3, tubular membrane 4 and production water pool 5, it is characterized by: destabilization sedimentation tank 2 is set on one side of destabilization reactor 1, softening reaction tank 3 is set on the side of destabilization sedimentation tank 2 away from destabilization reactor 1, tubular membrane 4 is set on the side of softening reaction tank 3 away from destabilization sedimentation tank 2, production water pool 5 is set on the side of tubular membrane 4 away from softening reaction tank 3.

[0014] Destabilization sedimentation tank 2 is connected and set with calcium sulfate sludge tank 9, and the second dehydrator 8 is connected and set on the calcium sulfate sludge tank 9.

[0015] Tubular membrane 4 is connected and set with softening sludge tank 6, and the first dehydrator 7 is connected and set on the softening sludge tank 6.

[0016] Working principle: high sulfate wastewater enters the destabilization reactor 1, calcium sulfate, sodium sulfate and other common destabilizing agents are added in the destabilization reactor 1, the destabilizing agent is fully mixed and contacted with the wastewater in the destabilization reactor 1, the destabilizing agent makes the supersaturated calcium sulfate in the wastewater crystallize or produce calcium sulfate precipitate, the solid-liquid mixture generated by the reaction enters the destabilization sedimentation tank 2, in the destabilization sedimentation tank 2, the precipitate generated by the reaction is precipitated to the bottom of the destabilization sedimentation tank 2 under the action of gravity, and then is discharged to the calcium sulfate sludge tank 9 through the sludge pump;

[0017] The supernatant of the destabilization sedimentation tank 2 enters the softening reaction tank 3, after being treated by the destabilization reactor 1, the calcium ions in the wastewater can be effectively removed, and in the softening reaction tank 3, double alkali is added, the residual calcium ions react with carbonate to generate calcium carbonate precipitate, and the magnesium ions react with hydroxyl ions to generate magnesium hydroxide precipitate;

[0018] The solid-liquid mixture generated by the reaction enters the tubular membrane 4 for solid-liquid separation, the suspended matter is completely intercepted by the membrane, the calcium and magnesium ions in the permeate water are reduced to a very low level, the carbonated calcium and magnesium hydroxide sludge produced by concentration is discharged into the softening sludge tank 6 through the sludge pump, and the sludge in the calcium sulfate sludge tank 9 is treated by the second dewatering machine 8, and then the filtrate is returned to the destabilization reactor 1, the high-purity calcium sulfate sludge cake (gypsum) produced can be sold, and the softening sludge tank 6 is treated by the first dewatering machine 7, and then the filtrate is returned to the softening reaction tank 3, and the softening sludge is treated.

[0019] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A softening system for high-sulfate wastewater, comprising a destabilizing reactor (1), a destabilizing sedimentation tank (2), a softening reaction tank (3), a tubular membrane (4), and a product water tank (5), characterized in that: The destabilizing sedimentation tank (2) is located on one side of the destabilizing reactor (1), the softening reaction tank (3) is located on the side of the destabilizing sedimentation tank (2) away from the destabilizing reactor (1), the tubular membrane (4) is located on the side of the softening reaction tank (3) away from the destabilizing sedimentation tank (2), and the product water tank (5) is located on the side of the tubular membrane (4) away from the softening reaction tank (3).

2. The softening system for high-sulfate wastewater according to claim 1, characterized in that: A calcium sulfate sludge tank (9) is connected to the destabilizing sedimentation tank (2), and a second dewatering machine (8) is connected to the calcium sulfate sludge tank (9).

3. The softening system for high-sulfate wastewater according to claim 2, characterized in that: A sludge softening tank (6) is connected to the tubular membrane (4), and a first dewatering machine (7) is connected to the sludge softening tank (6).

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