Sunlight cascade concentration and energy reduction method for wastewater treatment

Abstract

The present application relates to wastewater treatment technical field, specifically disclose a kind of sunlight step concentration energy-reducing wastewater treatment method, S1: wastewater raw water is in accordance with fixed flow in raw water delivery pipeline continuously transported to flocculation mixing device, S2: wastewater enters first step tank by the top of sunlight step concentration energy-reducing plate, with the increase of liquid level in first step tank, flocculation is deposited in first step tank, liquid in first step tank spills over tank edge overflow to second step tank with height difference vertically, S3: wastewater is obtained after being filtered and evaporated daily higher than normal temperature concentrated filtrate, finally the liquid collected in the nth step tank is transported to evaporation crystallization treatment bin;Wastewater in step is heated by absorbing sunlight, while a small amount of liquid evaporation condensate is collected, and the concentration of high-pressure liquid after evaporation increases, thereby reducing the amount of liquid input into evaporation crystallization treatment bin, so that evaporation crystallization treatment bin can treat larger volume of wastewater raw water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a sunlight step-by-step concentration and energy reduction wastewater treatment method. BACKGROUND

[0002] High-salinity wastewater is purified by evaporation and steam condensation. The liquid in the evaporation bin is gradually converted into steam, and finally, the crystalline particles are left in the evaporation bin for further dewatering and evaporation until dry crystalline particles are obtained and discharged. The steam treatment machine mainly consists of a silo, a turnover plate, a steam generator, a steam discharger, and a condenser. The high-salinity wastewater enters the silo, the steam generator heats the silo, and the turnover plate moves in the silo. Even a negative pressure silo is used to make the liquid produce steam below 100 DEG C. At this time, the liquid gradually forms crystals during the turning process.

[0003] Currently, if the high-salinity wastewater is directly treated by evaporation, a large amount of crystalline particles will be quickly produced in the silo due to the high salinity of the water, which increases the driving resistance of the turnover plate and increases the energy consumption. In addition, heating the high-salinity wastewater will also cause a large amount of heat energy loss.

[0004] In order to improve the treatment effect of the steam discharger and reduce the amount of particles, a flocculation tank and a sedimentation tank are added in front of the raw wastewater. After the flocculant is fully mixed by the flocculation tank, the supernatant is obtained after a period of sedimentation in the sedimentation tank, and then sent to the steam processor. The impurity content of the treated wastewater is further reduced. However, the process time is increased. SUMMARY

[0005] The present application aims to provide a sunlight step-by-step concentration and energy reduction wastewater treatment method to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A sunlight step-by-step concentration and energy reduction wastewater treatment method, comprising:

[0008] S1: The raw wastewater is continuously transported into the flocculation mixing device in the raw water conveying pipeline according to a fixed flow rate, the flocculant is put into the raw water conveying pipeline according to the mixing ratio with the water and mixed with the wastewater, the flocculation mixing tank mechanically stirs the flocculation mixed wastewater, and the wastewater is transported into the sunlight step-by-step concentration and energy reduction plate placed in an outdoor unobstructed area;

[0009] S2: The wastewater enters the first step-by-step concentration and energy reduction tank through the top of the sunlight step-by-step concentration and energy reduction plate. As the liquid level in the first step-by-step concentration and energy reduction tank increases, the flocculation material is deposited in the first step-by-step concentration and energy reduction tank. The liquid in the first step-by-step concentration and energy reduction tank overflows the tank edge and flows into the second step-by-step concentration and energy reduction tank with a height difference, and then flows into the nth step-by-step concentration and energy reduction tank.

[0010] S3: After the wastewater is flocculated and filtered and daily evaporation, concentrated filtered wastewater higher than normal temperature is obtained, and the liquid collected in the nth step tank is delivered to an evaporation crystallization treatment bin;

[0011] S4: The concentrated filtered wastewater higher than normal temperature is heated by injecting steam in the evaporation crystallization treatment bin, and steam is generated by the intervention of a mixing device. The steam is cooled by a heat exchanger to obtain filtered water, and granular crystals are gradually formed in the evaporation crystallization treatment bin;

[0012] S5: The heat exchanger is injected with cooling liquid and generates high-temperature backflow water after backflow, which is delivered to the steam generating device of S4 to supplement the base liquid for generating steam.

[0013] As a further scheme of the present application: S21: The residence time of the wastewater in the sunlight step concentration energy reduction plate is increased, and the evaporation condensate is generated in the sunlight step concentration energy reduction plate under the influence of solar heat absorption and the increase of the liquid surface area caused by the step tank, and the evaporation condensate is stored to obtain backflush liquid.

[0014] As a further scheme of the present application: S22: The bottom surface of any step tank is paved with an adsorption roll material, which is a porous material, such as activated carbon fiber cloth, filter cloth, palm cloth, and sponge.

[0015] As a further scheme of the present application: S23: When the sewage cannot be delivered in S1, the sunlight step concentration energy reduction plate stops liquid delivery and liquid feeding, and the granular crystals are discharged after the liquid in the evaporation crystallization treatment bin in S4 is completely evaporated.

[0016] As a further scheme of the present application: S24: After the condensate generated by the evaporation of the liquid in the sunlight step concentration energy reduction plate is collected, the flushing liquid is continuously obtained until the water is completely evaporated. The adsorption roll material in the n step tanks is wound and wrapped to flocculate the particles, and the flushing liquid is used for washing, and the new roll material is replaced for secondary use.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] High-salt wastewater is directly transported into a flocculation mixing device. During the transportation process, flocculants can be quantitatively and speedily added according to the flow of the waste liquid. The precipitation process is abandoned. A sunlight step concentration energy reduction plate is selected. The wastewater in the step is heated by absorbing sunlight and at the same time a small amount of liquid is evaporated and collected. On the one hand, the liquid content is reduced, and on the other hand, the temperature of the liquid begins to rise. The step tank spreads the liquid to increase the surface area, so that the heat absorption speed of the liquid increases, and the liquid finally flows downward. After evaporation, the concentration of the high-pressure liquid increases, thereby reducing the amount of liquid input into the evaporation crystallization treatment bin, so that the evaporation crystallization treatment bin can process a larger amount of raw wastewater, and through the heating action of the sunlight step concentration energy reduction plate, the temperature difference of the concentrated and filtered waste liquid entering the evaporation crystallization treatment bin under negative pressure to reach the critical point of steam is reduced, thereby reducing the energy consumption required for heating. The low-temperature liquid of the cooling liquid is in contact with the heat exchanger to reduce the temperature, so that the steam reaches the condensation point to produce liquid to obtain clean water. The cooling liquid that flows back after being heated can flow back to the steam generating device to generate new steam to heat the evaporation crystallization treatment bin, thereby reducing the energy consumption. Since the precipitation process is ignored, the addition of this process will not increase the overall process time and reduce the water treatment cost.

[0019] On the basis of the above advantages, the waste liquid remaining in the step tank slowly evaporates without new liquid injection. At this time, the particles in the step tank are collected and then the step tank is flushed with condensed liquid. In actual application, the treatment cycle can be set according to the size, frequency of use and factory demand. The adsorption coiled material can adsorb a small amount of salt and mainly plays an auxiliary role to relieve the treatment pressure of the steam evaporation crystallization treatment bin. During the treatment, only the adsorption coiled material mixed with flocculation particles and crystallization is rolled up. At this time, the step tank is cleaner. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Fig. 1 It is a sunlight step concentration energy reduction wastewater treatment method diagram;

[0022] Fig. 2 It is a sunlight step concentration energy reduction wastewater treatment flow diagram. DETAILED DESCRIPTION

[0023] Please refer to Figs. 1-2 :

[0024] In this embodiment, S1: the raw wastewater is continuously conveyed into the flocculation mixing device according to a fixed flow rate in the raw water conveying pipeline, the flocculant is put into the raw water conveying pipeline according to the mixing ratio with the wastewater and is conveyed to the flocculation mixing device, the flocculation mixing pool mechanically stirs the flocculation mixed wastewater, and the wastewater is conveyed into the sunlight step concentration and energy reduction plate placed in the outdoor unobstructed area.

[0025] In this embodiment, the raw wastewater in S1 is high-salinity wastewater, which is directly conveyed into the flocculation mixing device. During the conveying process, the flocculant can be quantitatively and constantly put into the wastewater according to the flow rate. At this time, the mixed wastewater with the flocculant conveyed into the flocculation mixing device is directly conveyed into the sunlight step concentration and energy reduction plate after being stirred in the flocculation mixing device.

[0026] S2: the wastewater enters the first step tank through the top of the sunlight step concentration and energy reduction plate. As the liquid level in the first step tank increases, the flocculant precipitates in the first step tank. The liquid in the first step tank overflows the tank edge and flows into the second step tank vertically with a height difference, and then flows into the nth step tank. S3: the wastewater is obtained after flocculation filtration and daily evaporation, which is higher than the normal temperature. The liquid collected through the nth step tank is conveyed into the evaporation and crystallization treatment bin.

[0027] In this embodiment, the sunlight step concentration and energy reduction plate has a closed cavity and a step surface inside the cavity. The slot body with a closed periphery and an open top is arranged on the step surface. The sunlight step concentration and energy reduction plate is arranged outdoors or on the roof. Please refer to Fig. 2The top of the groove is an open structure, and the whole ladder surface is closed by a panel and a peripheral plate. The bottom of the sunlight ladder concentration and energy reduction plate is provided with a concentrated waste liquid channel, and the waste liquid is poured through the top of the sunlight ladder concentration and energy reduction plate. Because the factory produces in the morning, the waste water is generally produced after a period of production and processing, which is close to the noon high temperature period. Under the action of the high temperature period, the flocculation mixed waste liquid is accumulated in the first ladder groove at the highest point, the liquid level starts to rise, and the particles start to settle. The particles impurities flowing downward from the edge of the first ladder groove to the second ladder groove are less than the above steps. The waste water in the step is collected by absorbing sunlight and a small amount of liquid evaporation. On the one hand, the liquid content is reduced, and on the other hand, the temperature of the liquid starts to rise. The ladder groove increases the surface area of the liquid, increases the heat absorption speed of the liquid, and finally flows downward. The high-pressure liquid concentration increases after evaporation, thereby reducing the amount of liquid poured into the evaporation crystallization treatment bin. At this time, the liquid quality of the waste water is A. Assuming that the salinity a is not affected by flocculation, the liquid quality after evaporation concentration and filtration treatment by the sunlight ladder concentration and energy reduction plate is less than A, but the salinity a is unchanged, thereby increasing the processing volume of the evaporation crystallization treatment bin. And the heating effect of the sunlight ladder concentration and energy reduction plate makes the temperature difference of the concentrated and filtered waste liquid entering the evaporation crystallization treatment bin to reach the critical point of steam under negative pressure decrease, thereby reducing the energy consumption required for heating.

[0028] S21: The residence time of the waste liquid in the sunlight ladder concentration and energy reduction plate is increased, and the evaporation and condensation liquid is obtained in the sunlight ladder concentration and energy reduction plate under the influence of solar heat absorption and the increase of the liquid surface area by the ladder groove. The evaporation and condensation liquid is obtained and stored, and the backflushing liquid is obtained.

[0029] In this embodiment, the ladder groove has flocculation particles, and the evaporation gas attached to the bottom surface of the top plate can be obtained by liquid collection groove, liquid suction structure, liquid gathering film, capillary effect liquid collection method, etc. The waste liquid remaining in the ladder groove slowly evaporates without new liquid injection. At this time, the particles in the ladder groove are collected, and the ladder groove is flushed with the condensation liquid.

[0030] S22: The bottom surface of any ladder groove is paved with an adsorption roll material, which is a porous material, such as activated carbon fiber cloth, filter cloth, palm cloth and sponge.

[0031] In this embodiment, the adsorption roll material can adsorb a small amount of salt, mainly playing an auxiliary role to relieve the processing pressure of the steam evaporation crystallization treatment bin. During processing, only the adsorption roll material mixed with flocculation particles and crystallization roll is needed. At this time, the ladder groove is cleaner.

[0032] In this embodiment, S23: when the sewage cannot be transported in S1, the sunlight step-by-step concentration energy reduction plate stops liquid feeding and liquid sending, and the liquid in the evaporation crystallization treatment bin is completely evaporated to discharge the granular crystals in S4.

[0033] In this embodiment, S24: after the condensate generated by the evaporation of the liquid in the sunlight step-by-step concentration energy reduction plate under the influence of sunlight is collected, the flushing liquid is continuously obtained until the moisture is completely evaporated, the adsorbed coiled material in the n step-by-step slots is coiled and wrapped to flocculate the particles, and the flushing liquid is used for washing and replacing the new coiled material, so that the coiled material can be used twice.

[0034] In this embodiment, S4: the concentrated filtered waste liquid higher than the normal temperature is heated by injecting steam in the evaporation crystallization treatment bin and mixed by the intervention of the mixing device to generate steam, the steam is cooled by the heat exchanger to obtain filtered water, and the granular crystals are gradually formed in the evaporation crystallization treatment bin.

[0035] In this embodiment, S5: the cooling liquid is injected into the heat exchanger and generates high-temperature backflow water after backflow, which is transported to the steam generating device in S4 to supplement the base liquid for generating steam.

[0036] In this embodiment, the low-temperature liquid of the cooling liquid is in contact with the heat exchanger to reduce the temperature, so that the steam reaches the condensation point to generate liquid to obtain clean water, and the backflow cooling liquid can be backflowed to the steam generating device after being heated, and then new steam is generated to heat the evaporation crystallization treatment bin, thereby comprehensively reducing the energy consumption.

[0037] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for treating solar-powered stepped concentration and energy-reducing wastewater, characterized in that, include: S1: Wastewater raw water is continuously transported to the flocculation mixing device in the raw water conveying pipeline at a fixed flow rate. The flocculant is added to the raw water conveying pipeline according to the mixing ratio with water, and mixed with the wastewater and transported to the flocculation mixing device. The flocculation mixing tank mechanically stirs the flocculated and mixed wastewater and transports the wastewater to the solar tiered energy reduction panel placed in an outdoor unshaded area. S2: Wastewater enters the first step tank through the top of the solar stepped energy-reducing plate. As the liquid level in the first step tank increases, flocculants settle in the first step tank. The liquid in the first step tank overflows over the side of the tank and flows to the second step tank with a vertical height difference, and then overflows to the nth step tank in sequence. S21: The waste liquid stays in the solar stepped energy-reducing plate for a longer period of time. Under the influence of solar heat absorption and the increased liquid surface area caused by the stepped tank, the condensate evaporates in the solar stepped energy-reducing plate and is stored to obtain backflushing liquid. S22: Absorbent roll material is laid on the bottom surface of any stepped groove; S3: After flocculation filtration and daily evaporation, the wastewater is concentrated and filtered at a temperature higher than normal. The liquid collected in the nth step tank is then transported to the evaporation and crystallization treatment chamber. S4: The concentrated filtration waste liquid at a temperature higher than normal is heated by steam injection and mixed in the evaporation crystallization treatment chamber to generate steam. The steam is cooled by a heat exchanger to obtain filtered water, and granular crystals gradually form in the evaporation crystallization treatment chamber. S5: Coolant is injected into the heat exchanger and after reflux, high-temperature reflux water is generated and transported to the steam generator in S4 to replenish the base liquid for steam generation.

2. The method for treating solar-powered stepped concentration and energy-reducing wastewater according to claim 1, characterized in that, In S22, the adsorption roll is a porous material, which is one of activated carbon fiber cloth, filter cloth, palm cloth, or sponge.

3. The method for treating solar-powered stepped concentration and energy-reducing wastewater according to claim 1, characterized in that, S23: When sewage cannot be transported in S1, the solar stepped concentration and energy reduction plate stops feeding and delivering liquid. In S4, the liquid in the evaporation and crystallization treatment chamber is completely evaporated and then discharged as particulate crystals.

4. The method for treating solar-powered stepped concentration and energy-reducing wastewater according to claim 1, characterized in that, S24: After the condensate generated by the continuous evaporation of the liquid in the solar stepped energy reduction plate under the influence of sunlight is collected, the flushing liquid is continued to be obtained until the water is completely evaporated. The adsorption roll in the n stepped groove is rolled up to cover the flocculent particles, and then rinsed with the flushing liquid. After replacing with a brand new roll, it can be reused.

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