CN213708035U - Electroplating wastewater treatment device - Google Patents

Abstract

The utility model discloses an electroplating effluent treatment plant, connect gradually and be provided with the preheating part of pre-heater including the wastewater disposal basin, be provided with the evaporation portion of evaporimeter, be provided with the thickening portion of thickening ware, be provided with the separation portion that centrifuge is used for separating the crystalline solid, and hold the mother liquor jar of saturated solution after centrifugation, the device is still including being provided with the agitator and being used for stirring the stirring portion that saturated solution and flocculating agent mixed the liquid, be used for placing the sedimentation tank of mixed liquid after the stirring, be connected with at the sedimentation tank with supernatant extraction to the water pump of wastewater disposal basin and be used for the desiccator of dry lower floor's precipitate and the row mud mouth of discharging dry back precipitate. Due to the adoption of the technical scheme, compared with the prior art, the treatment of the saturated mother liquor after centrifugation is added to the original MVR evaporation technology, the treated saturated mother liquor can be returned to the MVR system to be continuously evaporated, normal evaporation cannot be influenced, the evaporation efficiency is greatly improved, and the treatment speed of the electroplating wastewater is improved.

Description

Electroplating wastewater treatment device

Technical Field

The utility model relates to a sewage purification treatment technology, in particular to a treatment device for waste water generated by industrial electroplating.

Background

The electroplating waste liquid is discharged directly without being treated, which often causes serious pollution. The wastewater discharged in the electroplating production is characterized by multiple types and complex water quality. Besides cyanide-containing wastewater and acid-base wastewater, the wastewater also contains various heavy metals, various surfactants, citric acid, EDTA, thiourea, alkynediol, coumarin and other brightening agents and additives. If the electroplating wastewater is discharged without being treated, the electroplating wastewater can pollute drinking water and industrial water and cause great harm to human existence and ecological environment. Polluted water sources, soil and groundwater are difficult to purify in a short time. The specific hazards include that the living environment of microorganisms in water is damaged by acid-base wastewater, and the pH value of a water source and the growth of aquatic animals and plants are also influenced; the cyanide-containing wastewater has high toxicity, and can generate virulent hydrocyanic acid under an acidic condition. At high concentrations, death is immediately observed. Even at very low concentrations, it can cause headache and arrhythmia in a short time; heavy metal ions are among the highly toxic substances that are carcinogenic, teratogenic or mutagenic. Chromium can damage the skin, respiratory system and internal organs of the human body; excessive zinc can cause weakness and dizziness of the whole body and cause acute gastroenteritis symptoms. Chronic poisoning is caused by the accumulation of lead in the human body after long-term intake.

At present, in the treatment process of an electroplating wastewater treatment device, a strand of high-concentration electroplating wastewater is generated after the electroplating wastewater is subjected to membrane concentration or physicochemical pressure filtration. After the wastewater enters an evaporation system, concentration and crystallization are carried out to produce water and miscellaneous salt which reach the discharge standard. Because the high-concentration wastewater contains high COD and heavy metals, after evaporation concentration and enrichment, an evaporation system often seriously bubbles and cannot continue to evaporate, and the treatment speed of the wastewater is seriously influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the evaporation system can seriously bubble after the evaporation concentration and enrichment in the electroplating wastewater treatment process and can not continue to evaporate to influence the treatment speed of wastewater, the utility model aims to provide an electroplating wastewater treatment device, the evaporation system of which can not only bubble but also accelerate the evaporation speed.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides an electroplating wastewater treatment device, connect gradually and be provided with the preheating part of pre-heater including the wastewater disposal basin, be provided with the evaporation portion of evaporimeter, be provided with the thick portion of thick ware, be provided with the separation part that centrifuge is used for separating the crystalline solid, and hold the mother liquor jar of saturated solution after the centrifugation, the device is still including being provided with the agitator and being used for stirring the stirring portion that saturated solution and flocculating agent mixed the liquid, a sedimentation tank for placing the mixed liquid after the stirring, be connected with at the sedimentation tank with supernatant extraction to the water pump of wastewater disposal basin and be used for the desiccator of dry lower floor's precipitate and the mud discharging mouth of the dry back precipitate of discharging.

As a preferred technical scheme of the utility model, for better separate out the solid from low consistency semi-manufactured goods crystallization solution, increase the flocculation efficiency of material consistency and improvement flocculating agent. At least one sedimentation thickener is arranged in the sedimentation tank.

As the utility model discloses a preferred technical scheme, in order to reach accurate evaporation purpose, can take the sectional type evaporation according to the concentration difference, keep the temperature difference between liquid and the heating medium less be favorable to protecting product quality, effectively prevent to stick with paste the pipe more. The evaporator of the application adopts the MVR evaporator.

Due to the adoption of the technical scheme, compared with the prior art, the treatment of the saturated mother liquor after centrifugation is added to the original MVR evaporation technology, the treated saturated mother liquor can be returned to the MVR system to be continuously evaporated, normal evaporation cannot be influenced, the evaporation efficiency is greatly improved, and the treatment speed of the electroplating wastewater is improved.

Drawings

FIG. 1 is a schematic view of the structure of an electroplating wastewater treatment device of the utility model.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings:

referring to fig. 1, the utility model discloses an electroplating wastewater treatment device, which comprises a wastewater pool, a preheating part, an evaporation part and a compressor, wherein the wastewater pool is connected in sequence through a transfer pump and is provided with a preheater, the evaporation part is provided with a falling film evaporator, and recycled water is discharged through the compressor; the device comprises a thickening part provided with a thickener, a centrifugal machine used for separating crystals, and a mother liquor tank used for containing saturated solution after centrifugation, and further comprises a stirring part provided with a stirrer and used for stirring the mixed solution of the saturated solution and a flocculating agent, a sedimentation tank used for placing the mixed solution after stirring, and a water pump used for extracting supernatant to a waste water tank, a dryer used for drying lower-layer precipitate and a sludge discharge port used for discharging the dried precipitate are connected to the sedimentation tank. Storing a wastewater stock solution through a wastewater pool, and conveying the wastewater stock solution into a preheating part through a feed pump for preheating; heating and pressurizing the waste water circulating evaporator through a falling film evaporator, then, crystallizing the waste water in a crystallization separator, then, entering a thick part and opening the thick device after crystallization, then, flowing through a centrifugal machine and opening the centrifugal machine, and outputting salt crystals after centrifugation through the centrifugal machine, thereby realizing separation of salt water; and the saturated solution of the crystals liquefied in the centrifugal process flows into the mother liquor tank for heating operation again, and then flows into the stirring part from the mother liquor tank to be mixed and stirred by adding the flocculating agent. And finally, the stirred mixed liquid enters a sedimentation tank for sedimentation, a thickener is placed in the sedimentation tank again for better separation effect for thickening treatment, the supernatant in the sedimentation tank is pumped to a wastewater tank by a water pump for continuous circulation, the lower-layer precipitate is dried by a dryer, and the dried precipitate is discharged through a sludge discharge port. The saturated mother liquor treatment after centrifugation is added, the treated saturated mother liquor can be returned to the MVR system to continue evaporation, normal evaporation cannot be influenced, the evaporation efficiency is greatly improved, and the treatment speed of the electroplating wastewater is improved.

The flocculating constituent is separated from the water phase sediment under the action of gravity after growing to a certain volume, so that a large amount of suspended matters in the wastewater are removed, the effect of water treatment is achieved, mechanical stirring is usually performed in order to ensure that the flocculating constituent is fully contacted with the water body and the particle collision speed is increased, and the stirring speed and time must be proper. Too short stirring time, insufficient flocculation, too fast stirring speed and too long stirring time can break the formed flocculation and reduce the bridging adsorption capacity of the macromolecular chains. The supernatant is the liquid between the sludge at the bottom of the tank and the scum at the top. The preheater has the main function of fully utilizing the waste heat of the waste gas discharged by the rotary kiln and the decomposing furnace to heat the raw material so as to preheat the raw material and decompose part of carbonate. The MVR evaporator adopts sectional type evaporation according to different required product concentrations, and the thickener is primary crystal liquid separation equipment for separating solids from low-consistency semi-finished product crystallization solution and increasing the consistency of materials. In the thickener, crystals with larger specific gravity are slowly settled due to the difference of specific gravity between the crystal liquid, and supernatant and suspended substances are slowly floated, thereby realizing the separation of the crystals and the liquid. The crystals sinking to the bottom are collected into thick slurry and discharged from a discharge port, and the thick slurry enters a centrifuge for further separation. The crystal mush is conveyed to a drier for drying after the mother liquid is removed under the action of centrifugal force until a final product is formed. Supernatant overflowing from the upper part of the thickener and mother liquor discharged from the centrifuge are converged and discharged into a mother liquor tank for storage, and the supernatant and the mother liquor are reused continuously. The mother liquor is a saturated solution remaining after separation of the precipitate or crystals during the chemical precipitation or crystallization process.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, which are within the scope of the present invention.

Claims (4)

1. The utility model provides an electroplating wastewater treatment device, a serial communication port, include that the wastewater disposal basin connects gradually and is provided with the preheating part of pre-heater, be provided with the evaporation portion of evaporimeter, be provided with the thick portion of thick ware, be provided with centrifuge and be used for separating the separation portion of crystal body to and hold the mother liquor jar of saturated solution after the centrifugation, the device is still including being provided with the agitator and being used for stirring the stirring portion that saturated solution and flocculating agent mixed the liquid, be used for placing the sedimentation tank of mixed liquid after the stirring, the sedimentation tank be connected with the water pump that extracts supernatant to the wastewater disposal basin and be used for the desiccator of dry lower floor's precipitate and the row mud mouth of the dry back precipitate of discharge.

2. The electroplating wastewater treatment apparatus according to claim 1, wherein at least one settling thickener is arranged in the settling tank.

3. The electroplating wastewater treatment apparatus according to claim 1 or 2, wherein the evaporator is an MVR evaporator.

4. The electroplating wastewater treatment apparatus according to claim 1 or 2, wherein the thickener is a high-rate thickener.

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