CN218709550U - Device for treating high-hardness silicon-containing wastewater - Google Patents
Device for treating high-hardness silicon-containing wastewater Download PDFInfo
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- CN218709550U CN218709550U CN202222109872.4U CN202222109872U CN218709550U CN 218709550 U CN218709550 U CN 218709550U CN 202222109872 U CN202222109872 U CN 202222109872U CN 218709550 U CN218709550 U CN 218709550U
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Abstract
The utility model aims to provide a device for treating high-hardness silicon-containing wastewater, which comprises a desiliconization device, wherein the desiliconization device comprises a first regulating tank, a first coagulation tank and a first sedimentation tank which are sequentially connected along the wastewater flow direction, the first regulating tank is provided with a first medicament feeding pipe so as to maintain the pH value of the wastewater in the tank to be about 11, and the first sedimentation tank is used for precipitating and separating silicon-magnesium insoluble substances; the hardness removal device comprises a regulating reservoir II, a coagulation reservoir II and a sedimentation reservoir II which are sequentially connected along the flow direction of wastewater, wherein the regulating reservoir II is communicated with the sedimentation reservoir I, the regulating reservoir II is communicated with an acid gas inlet pipe, the acid gas inlet pipe conveys gasified waste gas rich in carbon dioxide, the regulating reservoir is also provided with a second medicament feeding pipe to provide the required alkalinity for hardness removal of wastewater in the regulating reservoir II, and the sedimentation reservoir is used for sedimentation to remove the residual hardness in the wastewater. The device has the characteristics of energy conservation, environmental protection, less medicament addition, simple and convenient operation, lower cost and less sludge output.
Description
Technical Field
The utility model belongs to the technical field of waste water treatment, concretely relates to handle device of silicon-containing waste water of high rigidity.
Background
With the gradual enhancement of environmental awareness, in order to improve the living environment of people, the nation continuously puts higher requirements on the discharge index of sewage, and many domestic sewage treatment plants face the difficult problem of how to realize sewage treatment by the most suitable method and process under the condition of economy and environmental protection. On the other hand, as the energy of the earth becomes more and more intense and the greenhouse effect becomes stronger, CO is generated 2 The gas is the main gas causing the greenhouse effect of the atmosphere, and the key measure for solving the greenhouse effect is to control CO 2 Emission of CO 2 Will certainly receive more and more attention.
In a water-coal-slurry gasification plant, the main sources of wastewater are: initial rainwater and domestic sewage, process production wastewater (mainly comprising black water in a gasification furnace and black water after washing with synthesis gas in a washing tower, black water separated from a slag pool and wastewater with high solid content discharged to a grinding pool in an accident), and wastewater discharged to public engineering treatment (partially discharged by a low-pressure ash water pump). The water-coal-slurry gasification grey water/black water mainly comes from quenching water of a gasification furnace and washing water of a gasification process, hardness in coal gasification wastewater mainly comes from water but mostly comes from ash content and process media of coal, the proportion of CaO and MgO in the coal ash is high, lime is required to be added as a fluxing agent to increase calcium-containing mineral substances, the gasification furnace is in an acidic environment, and gasified synthesis gas and coal slag enter a water system after passing through a water bath of a chilling chamber, so that the water system has high contents of calcium ions, magnesium ions, silicon dioxide and the like. The device has high wastewater hardness, so that subsequent equipment for wastewater treatment and pipelines can be seriously scaled and even blocked, and the water yield of the equipment is low; high silicon content can lead to subsequent reuse water devices, such as membrane devices, being plugged by contamination and frequently cleaned, resulting in normal production being affected. Therefore, the wastewater needs to be pretreated for reducing suspended matters, desiliconizing, removing hardness and the like in advance so as to ensure the normal operation of a subsequent water treatment system.
The hardness removing method comprises an electric flocculation method, a coagulating sedimentation method and the like, and the electric flocculation hardness removing process has the defects of electrode passivation, electrolytic polarization, large power consumption, high operation cost and the like; the coagulating sedimentation achieves the purpose of hardness removal by adding a medicament, but is easily influenced by factors such as the quality of raw water, the type and the adding amount of a coagulant, pH (potential of hydrogen), water temperature, hydraulic conditions and the like, and has higher selectivity on the water quality; the acid gas hardness removing technology is improved by lime soda ash method, mainly uses a boiler tail gas to remove Ca in water 2+ 、Mg 2+ And after replacement, the acid gas can be used for removing hardness of the gasified black water by utilizing the existing emptying acid gas, so that the method has great comparative advantages.
The desiliconization method comprises a coagulating sedimentation method, an ion exchange method, an electrocoagulation method and the like. The coagulating sedimentation method is a physical and chemical method for achieving the aim of desiliconization by utilizing the adsorption or condensation of oxides or hydroxides of certain metals on silicon, can carry out batch treatment on water bodies with serious pollution and complex water quality, but has large mud yield and long sedimentation time, thereby occupying large area; the ion exchange method has high removal efficiency of the ionic silicon, the content of the silicon in the effluent can reach less than 1mg/L, but the method can not remove the colloidal silicon and requires low salt content of the raw water, and the ion exchange method has high cost due to high manufacturing cost of the ion exchange resin and high possibility of failure caused by pollution; the electrocoagulation method utilizes electrochemical reaction to generate a metal hydrate coagulant through electrode reaction, and coagulation is realized through adsorption of the coagulant, the electrocoagulation method can not only effectively remove silicon dioxide, but also remove heavy metal ions, organic matters and the like in water, but the electrocoagulation method requires low content of water-inlet cations, and has large power consumption and large investment cost.
As a non-advanced treatment silicon removal method, the most widely applied method is a coagulation silicon removal technology, and the most commonly used method in China is magnesium agent silicon removal. A large amount of magnesium oxide, magnesium chloride and the like are added into the wastewater, the magnesium hydroxide is generated by reaction with water and is dissociated into magnesium ions and hydroxyl ions in the water, and silicon in the wastewater is removed in a mode of generating magnesium silicate precipitate by reaction of the magnesium ions and free silicon dioxide in the wastewater.
Chinese patent CN108821406A provides a combined silicon and hardness removal process for coal gasification wastewater, which comprises the following steps of 1) adding a medicament A into the coal gasification wastewater; 2) Adding the agent B, the agent C and the agent D into the coal gasification wastewater treated in the step 1) at a constant speed; 3) Then standing and clarifying the coal gasification wastewater treated by the step 2). The combined process for removing silicon and hardness from coal gasification wastewater has the advantages of simple operation and short process flow, and silicon and hardness in wastewater can be better removed at normal temperature and normal pressure, but the method has the disadvantages of large dosage, large amount of generated mud and high cost.
Chinese patent document CN201821238025.5 discloses a high-salinity wastewater hardness-removing and silicon-concentrating treatment system, which adopts at least one of magnesium oxide or magnesium chloride dosing equipment to remove silicon, adopts at least one of lime and soda dosing equipment or sodium hydroxide and lime dosing equipment to remove hardness, adopts a tubular membrane device to perform solid-liquid separation and filtration on wastewater after softening and silicon-removing treatment, and adopts an ion exchange device to further soften the wastewater to achieve the effect of removing hardness and silicon. But this system adopts the agent desiliconization of magnesium and two alkaline methods to remove hard, and the charge is big and can produce a large amount of mud, in addition, directly adopts tubular membrane to filter, and the energy consumption is high and very easily causes the membrane jam, increases use cost.
Chinese patent document CN201920521276.2 discloses a novel high-efficiency sedimentation tank device for removing hardness and silicon, which comprises a coagulation area, a hardness and silicon removing area and a flocculation area, wherein a chemical sedimentation method is adopted to remove active silicon and hardness through slaked lime, soda ash and a magnesium agent, but the method neglects the optimal pH difference for removing hardness and silicon, and the dosage of a medicament is large.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model aims at providing an energy-concerving and environment-protective, medicament is thrown and is thrown few, easy and simple to handle, the cost is lower and the device of the siliceous waste water of high rigidity that mud output is few.
In order to achieve the above object, the present invention provides the following technical solutions:
an apparatus for treating high hardness silicon-containing wastewater, comprising:
the desiliconization device comprises a first adjusting tank, a first coagulation tank and a first sedimentation tank which are sequentially connected in the wastewater flow direction, wherein the first adjusting tank is provided with a first medicament feeding pipe to maintain the pH value of wastewater in the tank at 11-11.5, and the first sedimentation tank is used for precipitating and separating silicon-magnesium insoluble substances;
the hardness removal device comprises a regulating reservoir II, a coagulation reservoir II and a sedimentation reservoir II which are sequentially connected along the flow direction of wastewater, wherein the regulating reservoir II is communicated with the sedimentation reservoir I, the regulating reservoir II is communicated with an acid gas inlet pipe, the acid gas inlet pipe conveys gasified waste gas rich in carbon dioxide, the regulating reservoir is also provided with a second medicament feeding pipe to provide the required alkalinity for hardness removal of wastewater in the regulating reservoir II, and the sedimentation reservoir is used for sedimentation to remove the residual hardness in the wastewater.
In some technical schemes, iron salt feeding pipes are arranged in the first regulating tank and the second regulating tank, so that wastewater in the first regulating tank further reacts to generate metal silicate precipitate and the precipitate in the second regulating tank is polymerized to form small flocs;
PAM throwing pipes are arranged in the first coagulation tank and the second coagulation tank to accelerate the coagulation sedimentation.
In some technical schemes, high-speed stirrers are arranged in the first regulating tank and the second regulating tank so as to ensure that the added medicament is rapidly and uniformly dispersed and fully contacted with the wastewater to form small flocs;
and low-speed stirrers are uniformly arranged in the first coagulation tank and the second coagulation tank so as to uniformly disperse the added flocculating agent, fully contact with the wastewater and gather small flocs to form large alum flocs beneficial to precipitation.
In some technical schemes, the first medicament administration tube conveys one or more than two of sodium hydroxide, potassium hydroxide, lime milk and magnesium oxide;
the second agent feeding pipe is used for conveying one or two of sodium hydroxide and lime.
In some technical schemes, the first sedimentation tank and the second sedimentation tank are both in a conical bottom structure, and inclined plates used for removing residual impurities in the wastewater are arranged on the upper parts of the sedimentation tanks.
In some technical schemes, a gas distributor is arranged in the second regulating tank, and the gas distributor is communicated with the acid gas inlet pipe and is used for uniformly diffusing the acid gas to the whole tank body.
In some technical schemes, the gas distributor is arranged at the bottom of the second regulating tank and comprises a plurality of aeration pipes which are arranged in a staggered mode, and gas outlets facing the bottom of the tank are distributed on the surface of each aeration pipe.
In some technical schemes, the gas outlet is provided with a light float valve, when the gas distributor starts to work, the gas pushes the hemispherical shell-shaped float valve open, and when gas inlet is stopped, the float valve is closed under the action of water pressure.
In some technical schemes, a gas cooler, an air compressor and a gas storage tank are sequentially arranged on the acid gas inlet pipe along the gas inlet direction,
the acid gas advances the inner wall coating three-pass formula acid-resistant anticorrosive coating of pipe and gas holder, wherein, wet membrane coating thickness is: one channel is 90 microns, two channels are 100 microns, and three channels are 80 microns; the dry film coating thickness is: one 40 micron, two 40 micron, three 35 micron.
In some technical schemes, pH monitors are arranged in the first regulating tank and the second regulating tank; and/or the air inlet of the air storage tank is provided with a flow meter and a one-way valve, the air outlet of the air storage tank is provided with a switch valve, and the top of the air storage tank is provided with a pressure sensor and a closed overpressure relief valve.
The utility model adopts the above technical scheme at least have following beneficial effect:
1. energy conservation and environmental protection: the traditional treatment method for the incinerator gas outlet is characterized in that the incinerator gas outlet is discharged at a high point through a chimney, after improvement, the tail gas incinerator gas outlet can be further used for hardness removal and silicon removal of coal gasification wastewater, and no toxic by-products are generated, so that the dosage of a medicament can be effectively reduced, the cost is low, the sludge yield is low, the removal efficiency is high, the carbon dioxide emission is reduced, the national carbon emission reduction policy is fitted, and the application prospect is good;
2. less medicament is added: according to the method, the pH is adjusted, the magnesium in the high-hardness wastewater is utilized to remove the silicon in the wastewater, and only a small amount of medicament is added to effectively remove the silicon;
3. the treatment efficiency is high: the silicon and hardness removal is carried out by two steps under different pH conditions, so that the silicon and magnesium precipitate formed when the pH is lower can be prevented from being re-dissolved, the silicon removal effect is poor, the magnesium and the hardness in water can be removed together while the silicon is removed, the magnesium and the hardness can be removed by adding less or no lime during the hardness removal, the silicon content of the effluent of the method can be less than 20mg/L, and the hardness is less than 100mg/L.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings and their numbers used in the embodiments are briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart illustrating the structure of an apparatus for treating high hardness silicon-containing wastewater according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a gas distributor according to an embodiment of the present invention.
The notations in the figures have the following meanings:
1-regulating pool one; 2-a first coagulation tank; 3-a first sedimentation tank; 4-adjusting pool two; 5-a second coagulation tank; 6-a second sedimentation tank; 7-a gas cooler; 8, an air compressor; 9-a gas storage tank; 10-a gas distributor; 11-an aerator pipe; 12-gas outlet.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings.
It should be noted that the terms "first" and "second" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "multi-stage, multi-layer" means at least two stages/layers, e.g., two stages/layers, three stages/layers, etc.; and the term "and/or" is intended to include any and all combinations of one or more of the associated listed items.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, a device for treating high hardness silicon-containing wastewater is shown, which comprises a desiliconization device and a hardness removal device.
The desiliconization device comprises a regulating reservoir I1, a coagulation reservoir I2 and a sedimentation reservoir I3 which are sequentially connected in the wastewater flow direction, wherein a wastewater inlet pipe is arranged at the lower part of the regulating reservoir I1 and is used for conveying high-hardness silicon-containing coal gasification wastewater, a first medicament feeding pipe and a first ferrite feeding pipe are arranged at the upper part of the regulating reservoir I1, and the upper part of the regulating reservoir I1 is communicated with the coagulation reservoir I2; the upper part of the first coagulation tank 2 is provided with a PAM (Polyacrylamide) feeding pipe, the lower part of the first coagulation tank 2 is communicated with the first sedimentation tank 3, and the bottom of the first sedimentation tank 3 is communicated with a sludge discharge pipe for precipitating and separating insoluble substances of silicon and magnesium.
The desiliconization device comprises the following concrete steps:
high-hardness silicon-containing wastewater enters from the lower part of a regulating reservoir I1, a first medicament is added into the regulating reservoir I1 to regulate the pH of the wastewater to 10.5-11.5, under the condition that the pH is 11-11.5, silicon and part of magnesium in the wastewater are hard to form insoluble precipitates, meanwhile, part of calcium and magnesium ions dissolved in the water are combined with hydroxyl to form precipitates, the silicon in the water can be adsorbed and coated in the process, PFS is used as a flocculating agent, and Fe is used as a flocculating agent 2+ Reacting with silicon to form metal silicate, further removing part of silicon, and placing in regulating tank I1 after reacting for a period of time, waste water gets into coagulating basin one 2 from the upper portion, adds PAM stirring reaction and gets into sedimentation tank one 3 from the lower part after 2 in the coagulating basin, and the swash plate is built-in to sedimentation tank one 3, and the bottom communicates mud outer discharge pipe for precipitate the undissolved substance of getting rid of in the waste water, reaches the effect of getting rid of silicon and partial hardness in the waste water.
Except that hard device includes along waste water flow direction adjusting tank two 4 that connects in order, coagulating basin two 5 and sedimentation tank two 6, adjusting tank two 4 and sedimentation tank one 3's upper portion intercommunication, adjusting tank two 4 upper portions are equipped with second medicament and throw the pipe with second molysite, adjusting tank two 4 bottom intercommunication has the acid gas to advance the pipe, be used for carrying the coal gasification waste gas that is rich in carbon dioxide, adjusting tank two 4 upper portions and coagulating basin two 5 intercommunication, coagulating basin two 5 upper portions are equipped with second PAM and throw the pipe, coagulating basin two 5 lower parts and sedimentation tank two 6 intercommunication, the outside calandria of 6 bottom intercommunication mud in sedimentation tank is used for deposiing the surplus hardness of getting rid of in the waste water, the upper portion intercommunication exit tube clear liquid of sedimentation tank two 6.
The hard removing device comprises the following concrete steps:
effluent from the first sedimentation tank 3 enters a second regulation tank 4 from the upper part through a baffle plate, the addition amount of a second medicament is regulated according to the hardness change of calcium and magnesium in the effluent, acid gas is introduced into alkaline wastewater in the second regulation tank 4, the pH value in the second regulation tank 4 is maintained to be about 10 along with the reduction of the pH value in the reaction process, the introduced waste gas generates acid radicals to combine with residual calcium and magnesium ions in the water to generate precipitate, meanwhile, polymeric ferric sulfate is added, after the reaction is carried out in the second regulation tank 4 for a period of time, small flocs are formed, the effluent enters a second coagulation tank 5 from the upper part, PAM is added into the second coagulation tank 5, the reaction is carried out for a period of time, and the generated calcium and magnesium precipitate is further separated through coagulation precipitation, so that the effect of removing the residual hardness in the wastewater is achieved.
According to the embodiment, the silicon removal and hardness removal are respectively carried out by two steps under different pH conditions, so that the silicon and magnesium precipitate formed when the pH is lower can be prevented from being dissolved again, the silicon removal effect is poor, the consumed medicament is increased, the magnesium hardness in water can be removed together when the silicon is removed, and the magnesium hardness can be removed by adding less or no lime when the hardness is removed.
In the embodiment, the small amount of the medicament is added into the wastewaterCa 2+ 、Mg 2+ And silicon is removed, the silicon content and the hardness of the wastewater are reduced, the scaling rate of equipment and pipelines is slowed down, the generated waste gas is effectively used, and the carbon emission is reduced.
In some embodiments, high-speed stirrers are arranged in the regulating tank I1 and the regulating tank II 4, so that the added medicament is rapidly and uniformly dispersed and fully contacted with the wastewater to form small flocs; low-speed stirrers are uniformly arranged in the first coagulation tank 2 and the second coagulation tank 5 so as to uniformly disperse the added flocculating agent, fully contact with the wastewater and gather small flocs to form large alum flocs beneficial to precipitation; the residence time in the first coagulation tank 2 and the second coagulation tank 5 is 10-20min; the adjusting tank I1 is provided with a pH monitor for detecting the pH change in the adjusting tank I in real time, controlling the adding amount of the first medicament, maintaining the pH value in the adjusting tank I1 to be about 11, and keeping the adjusting tank I1 for 10-30min; and a pH monitor is arranged in the second regulating reservoir 4, the change of the pH in the regulating reservoir is detected in real time, the adding amount of the acid gas is controlled, the pH in the second regulating reservoir 4 is maintained at about 10, and the residence time of the second regulating reservoir 4 is 10-30min.
In some embodiments, the first agent is one or more of sodium hydroxide, potassium hydroxide, lime milk and magnesium oxide, and the composition of the agent can be adjusted according to the silicon content of the effluent; the second agent is one or two of sodium hydroxide and lime.
In a specific embodiment, the bottoms of the first sedimentation tank 3 and the second sedimentation tank 6 are conical, wastewater carries formed alum floc to slowly enter the sedimentation tanks, the sludge is gathered at the bottoms of the sedimentation tanks and is concentrated, and the inclined plates are arranged at the upper parts of the sedimentation tanks and used for removing residual impurities and ensuring the quality of effluent. The sludge at the bottom is pumped out by a sludge pump and discharged for further treatment, and the retention time of the sedimentation tank is 10-30min respectively.
In a preferred embodiment, referring to fig. 2, a gas distributor 10 is disposed in the second adjustment tank 4, and the gas distributor 10 is communicated with the acid gas inlet pipe for uniformly diffusing the acid gas into the whole tank body. Specifically, gas distributor 10 sets up in the lower part of (mixing) shaft, including a plurality of staggered arrangement's aeration pipe 11, and each aeration pipe 11 surface distribution has gas outlet 12 towards the bottom of the pool, and the acid gas that gas outlet 12 sprays sweeps the bottom, can effectively reduce sludge deposit, improves the medicament utilization ratio, makes water and medicament carry out the abundant reaction. The gas outlet 12 is provided with a light float valve which is pushed open by the gas when the gas distributor 10 starts to operate and closed by the water pressure when the gas inlet stops.
In another embodiment, a large amount of waste gas containing carbon dioxide is generated in the gasification process of the coal water slurry, the waste gas and the sulfur-making tail gas enter a tail gas quenching tower through a sulfur recovery device to remove water vapor, dust and ammonia gas entrained in the gas, and then the waste gas enters an amine liquid absorption tower to further absorb H in the waste gas 2 S, gas which is not absorbed by amine liquid enters a tail gas incinerator to carry out high-temperature reaction, heat is recovered, the gas outlet part of the tail gas incinerator enters a cooling pipeline to be cooled, a gas cooler 7 comprises a gas channel and an outer layer cooling water channel, the water inlet direction of cooling water is opposite to the gas inlet direction, the gas is cooled to 30-40 ℃, and the cooling water can be used as public water after being heated.
The cooled gas is compressed by an air compressor 8, the compressed gas is fed from the lower part of a gas storage tank 9, the gas is discharged from the upper part of the gas storage tank, the gas storage tank 9 is a carbon steel welding cylindrical container, the gas inlet and the gas outlet are connected by flanges, the gas inlet is provided with a flow meter and a one-way valve, the gas outlet of the gas storage tank 9 is provided with a switch valve, the top of the gas storage tank 9 is provided with a pressure sensor and a closed overpressure relief valve, the working pressure of the gas storage tank 9 is 1.0MPa at most, and the relief valve is opened for exhausting when the pressure is high.
Because the medium is acid gas, the acid gas inlet pipe and the inside of the gas storage tank 9 are coated with acid-resistant anticorrosive paint containing hydroxy epoxy resin, three coating films are adopted, and the coating film thickness is as follows: wet film preparation: one channel is about 90 microns, two channels are about 100 microns, and three channels are about 80 microns; dry film: one channel is about 40 microns, two channels are about 40 microns, and three channels are about 35 microns.
Example 1
The experimental raw materials are taken from Texaco gasifier black water, the silicon content is 180mg/L, and the total hardness is 1000mg/L. The method comprises the steps of enabling waste water to enter a first adjusting tank 1 from the bottom, detecting pH change in the adjusting tank in real time through a pH monitor arranged in the first adjusting tank 1, controlling the adding amount of a first medicament, enabling the first medicament to be sodium hydroxide, maintaining the pH in the first adjusting tank 1 to be 11-11.5, enabling the first adjusting tank 1 to stay for 15min, adding 50mg/L PFS into the first adjusting tank 1, enabling mixed liquid to enter a first coagulating tank 2 from the upper portion of the first adjusting tank 1 after being stirred by a high-speed stirrer, adding 2mg/LPAM into the first coagulating tank 2, enabling the first coagulating tank 2 to stay for 10min, enabling added flocculating agents to be uniformly dispersed through a low-speed stirrer to be fully contacted with the waste water, gathering small flocs to form large alum flocs beneficial to precipitation, enabling the large alum flocs to enter a first precipitating tank 3 from the bottom of the first coagulating tank 2, enabling sludge to be subjected to outward discharge treatment after inclined plate precipitation, enabling clear liquid to flow out from the upper portion of the second adjusting tank 4, adding 500ppm of a second agent into a second adjusting tank, wherein the second agent is sodium hydroxide, detecting the pH change in the adjusting tank in real time through a pH monitor arranged in the second adjusting tank 4, controlling the adding amount of acid gas, the acid gas is the exhaust gas of a tail gas incinerator, maintaining the pH value in the second adjusting tank 4 to be about 10, adding 50mg/LPFS, allowing the second adjusting tank 4 to stay for 15min, allowing a mixed solution to enter a second coagulation tank 5 from the upper part of the second adjusting tank 4 after being stirred by a high-speed stirrer, adding 2mg/LPAM into the first coagulation tank 2, allowing the first coagulation tank 2 to stay for 10min, allowing the mixed solution to enter a second sedimentation tank 6 from the bottom of the second coagulation tank 5 after being stirred by a low-speed stirrer, allowing sludge to be discharged by a bottom discharge pump after being precipitated by an inclined plate, discharging clear liquid from the upper part of a hardness removal tank, and allowing the silicon content of the discharged water to be 16.5mg/L (SiO 2) and the hardness to be 60mg/L.
Example 2
The experimental raw materials are taken from national Baotou coal gasification wastewater, the silicon content is 234mg/L, the total hardness is 1450mg/L, the wastewater enters a regulating tank I1 from the bottom, the pH change in the regulating tank I1 is detected in real time through a pH monitor arranged in the regulating tank I1, the adding amount of a first medicament is controlled, the first medicament is sodium hydroxide and magnesium oxide, the pH in the regulating tank I1 is maintained at 11-11.5, the residence time of the regulating tank I1 is 18min, 50mg/LPFS is added into the regulating tank I1, a mixed liquid is stirred by a high-speed stirrer and then enters a coagulation tank I2 from the upper part of the regulating tank I1, and the mixed liquid is fed into a coagulation tank I2 from the upper part of the regulating tank I1 and then fed into a coagulation tank I2, so that the waste water is recycledAdding 2mg/LPAM into a first coagulation tank 2, keeping the first coagulation tank 2 for 10min, treating by a low-speed stirrer, then entering a first sedimentation tank 3 from the bottom of the first coagulation tank 2, performing outward discharge treatment after inclined plate sedimentation of sludge, allowing clear liquid to flow out of the upper part of a second regulation tank 4, adding 700mg/L of a second medicament into the second regulation tank 4, wherein the second medicament is sodium hydroxide, detecting pH change in the regulation tank in real time through a pH monitor arranged in the second regulation tank 4, controlling the adding amount of acid gas, wherein the acid gas is tail gas incinerator gas, keeping the pH in the second regulation tank 4 at 9.5-10.5, adding 50mg/L of PFS, keeping the second regulation tank 4 for 15min, allowing mixed liquid to enter a second coagulation tank 5 from the upper part of the second regulation tank 4 after stirring by a high-speed stirrer, adding 2mg/LPAM into the first coagulation tank 2, keeping the first coagulation tank 2 for 10min, allowing the mixed liquid to enter a second sedimentation tank 6 from the bottom of the second coagulation tank after stirring by a high-speed stirrer, discharging the sludge through a discharge pump, and discharging the clear liquid with a silicon dioxide content of 1mg/L 2 ) The hardness was 71mg/L.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An apparatus for treating high-hardness silicon-containing wastewater, comprising:
the desiliconization device comprises a first adjusting tank, a first coagulation tank and a first sedimentation tank which are sequentially connected in the wastewater flow direction, wherein the first adjusting tank is provided with a first medicament feeding pipe to maintain the pH value of wastewater in the tank at 11-11.5, and the first sedimentation tank is used for precipitating and separating silicon-magnesium insoluble substances;
the hardness removal device comprises a regulating reservoir II, a coagulation reservoir II and a sedimentation reservoir II which are sequentially connected along the flow direction of wastewater, wherein the regulating reservoir II is communicated with the sedimentation reservoir I, the regulating reservoir II is communicated with an acid gas inlet pipe, the acid gas inlet pipe conveys gasified waste gas rich in carbon dioxide, the regulating reservoir is also provided with a second medicament feeding pipe to provide the required alkalinity for hardness removal of wastewater in the regulating reservoir II, and the sedimentation reservoir is used for sedimentation to remove the residual hardness in the wastewater.
2. The apparatus for treating high-hardness silicon-containing wastewater according to claim 1,
iron salt feeding pipes are arranged in the first regulating tank and the second regulating tank, so that wastewater in the first regulating tank further reacts to generate metal silicate precipitate and the precipitate in the second regulating tank is polymerized to form small flocs;
PAM feeding pipes are arranged in the first coagulation tank and the second coagulation tank to accelerate coagulation sedimentation.
3. The apparatus for treating high-hardness silicon-containing wastewater according to claim 2,
high-speed stirrers are arranged in the first regulating tank and the second regulating tank respectively, so that the added medicament is rapidly and uniformly dispersed and fully contacted with the wastewater to form small flocs;
and low-speed stirrers are uniformly arranged in the first coagulation tank and the second coagulation tank so as to uniformly disperse the added flocculating agent, fully contact with the wastewater and gather small flocs to form large alum flocs beneficial to precipitation.
4. The apparatus for treating high-hardness silicon-containing wastewater according to claim 1,
the first agent feeding pipe is used for conveying sodium hydroxide, potassium hydroxide, lime milk or magnesium oxide;
the second agent feeding pipe conveys sodium hydroxide or lime.
5. The apparatus for treating high-hardness silicon-containing wastewater according to claim 1,
the first sedimentation tank and the second sedimentation tank are both of conical bottom structures, and inclined plates used for removing residual impurities in the wastewater are arranged on the upper portions of the first sedimentation tank and the second sedimentation tank.
6. The apparatus for treating high-hardness silicon-containing wastewater according to claim 1,
and a gas distributor is arranged in the second regulating tank and is communicated with the acid gas inlet pipe so as to uniformly diffuse the acid gas to the whole tank body.
7. The apparatus for treating high-hardness silicon-containing wastewater according to claim 6,
the gas distributor is arranged at the bottom of the second regulating tank and comprises a plurality of aeration pipes which are arranged in a staggered mode, and gas outlets facing the bottom of the tank are distributed on the surface of each aeration pipe.
8. The apparatus for treating high-hardness silicon-containing wastewater according to claim 7,
the gas outlet is provided with a light floating valve, when the gas distributor starts to work, the gas jacks the hemispherical shell-shaped floating valve, and when gas inlet is stopped, the floating valve is closed under the action of water pressure.
9. The apparatus for treating high-hardness silicon-containing wastewater according to claim 1,
a gas cooler, an air compressor and a gas storage tank are sequentially arranged on the acid gas inlet pipe along the gas inlet direction,
the acid gas advances the inner wall coating three-pass formula acid-resistant anticorrosive coating of pipe and gas holder, wherein, wet membrane coating thickness is: one channel is 90 microns, two channels are 100 microns, and three channels are 80 microns; the dry film coating thickness is: one 40 micron, two 40 micron, three 35 micron.
10. The apparatus for treating high-hardness silicon-containing wastewater according to claim 9,
pH monitors are arranged in the first regulating tank and the second regulating tank; and/or the presence of a gas in the gas,
the gas storage tank is characterized in that a flow meter and a one-way valve are arranged at a gas inlet of the gas storage tank, a switch valve is arranged at a gas outlet of the gas storage tank, and a pressure sensor and a closed overpressure relief valve are arranged at the top of the gas storage tank.
Priority Applications (1)
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| CN202222109872.4U CN218709550U (en) | 2022-08-11 | 2022-08-11 | Device for treating high-hardness silicon-containing wastewater |
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