KR102064484B1 - Livestock wastewater treating system - Google Patents

Abstract

Disclosed is a system for treating livestock wastewater. The system comprises: an evaporation unit including a wastewater flow path and a steam flow path which are provided to be in contact with each other, and configured to evaporate wastewater by heat exchange with steam; a pre-heating unit including a steam flow path to which steam heat-exchanged with the wastewater in the evaporation unit is supplied and a wastewater flow path to which wastewater is supplied from the outside, wherein the steam flow path and the wastewater flow path are provided to be in contact with each other, and configured to pre-heat the wastewater supplied to the evaporation unit; a bubble removing unit configured to remove bubbles in waste vapor vaporized in the evaporation unit; a washing unit including a plurality of perforated plates disposed at regular intervals in the flow path, and configured to neutralize the waste vapor from which bubbles are removed by the bubble removing unit; and a waste heat recovery/supply unit configured to supply the waste vapor discharged from the washing unit to the steam flow path of the evaporation unit so that the waste vapor is heat-exchanged with wastewater supplied from the outside. Accordingly, wastewater is evaporated by steam and high-temperature waste vapor evaporated by heat exchange with the steam, and the high-temperature waste vapor is heat-exchanged with low-temperature wastewater supplied from the outside to be condensed. The present invention is able to purify wastewater through a distillation method with a very simple configuration and can significantly reduce installation and operation costs.

Description

Livestock wastewater treating system

The present invention relates to a system for purifying wastewater generated from various livestock houses and various wastewaters with high pollution, and more specifically, to effectively distill livestock wastewater by a simple configuration without separate preheating means and heat exchange means. The present invention relates to a livestock wastewater treatment system, which is capable of purifying the sludge, which is attached to the wastewater passage, to facilitate the stable distillation of the livestock wastewater.

Breeding of livestock from whales has become an important factor in diet, and the consumption of meat is greatly increased due to economic development and changes in diet. This has led to an increase in livestock raising, which has led to an increase in livestock farming. Accordingly, manure from livestock farms and sewage and wastewater containing it (hereinafter referred to as 'livestock wastewater') have also increased significantly. It is emerging.

In other words, the livestock wastewater is a mixture of wash water generated when cleaning livestock manure and livestock house. The pollution degree of livestock wastewater in the state of separation of manure component is 4,000 ~ 5,000ppm of Biological Oxygen Demand (BOD). If not separated, it may exceed 20,000ppm and cause serious water pollution.

On the other hand, various techniques for treating such livestock wastewater have been proposed and used, but since most of the treatment techniques incur significant costs in construction and management, it is very difficult to install or operate them in most livestock farms.

Commonly used livestock wastewater treatment methods include sawdust use method, activated sludge method, anaerobic fermentation method, etc., but they are also poorly applied due to the low cost and high treatment efficiency.

For this reason, many livestock farms did not properly treat livestock wastewater, but instead treated it with primitive natural decomposition methods such as dumping it into the ocean or spraying it on rice fields, which caused contamination of agricultural water and surrounding water and groundwater. It has caused many environmental problems such as not only enormous damage to neighboring farmhouses, but also severe odor.

However, marine dumping of livestock wastewater is strictly regulated under international law, and field farming is also increasingly deteriorated due to environmental problems. Therefore, livestock wastewater has to be properly purified and discharged.

Patent Document 1 discloses a pre-registered patent of the present applicant for solving the above conventional problems.

This technology is designed to obtain clean water by properly preheating the livestock wastewater, vaporizing it by steam heating, separating the liquid wastewater from the vaporized wastewater, and then condensing it by a heat exchanger. Compared with the conventional general treatment methods, there is an advantage that can reduce the cost of installation and maintenance.

However, the applicant's prior patented technology preheats the livestock wastewater with hot water heated by solar heat, and the livestock wastewater vaporized by steam heating is also condensed by using a heat exchanger composed of a condenser and a cooler, which is complicated in construction. Of course, the resulting cost increase was difficult to avoid.

In addition, a secondary heat exchanger is further provided for condensing the remaining condensate of the uncondensed wastewater through the condenser, and the liquid wastewater separated from the wastewater gas is purified through a separate auxiliary heater, an auxiliary separator, and an auxiliary condenser. As a result, the extremely complex configuration and the high cost thereof were a major obstacle to its installation operation.

In addition, if a rotating shaft having a plurality of scrapers is installed in the waste water pipe and the rotating shaft is rotated by a motor, each scraper is radially developed by centrifugal force to scrape the inner wall of the waste water pipe so as to remove sludge attached to the inner wall of the waste water pipe. However, since the scraper is simply hinged to the rotary shaft to be unfolded by centrifugal force, the sludge firmly fixed to the inner wall of the wastewater pipe is difficult to remove.

That is, since the wastewater pipe is heated to a high temperature, the sludge in the wastewater can be pressed relatively strongly to the inner wall thereof, and in this case, even if the scraper is developed by the centrifugal force, it is easy to rotate in the opposite direction of the centrifugal force due to the contact with the fixed sludge. It can be difficult to reliably clean the pipeline.

When the cleaning failure is caused in this way, there is a high possibility that the heat exchange rate is lowered, leading to poor vaporization of the livestock wastewater, the treatment efficiency of the device can be lowered.

1. Korea Patent Registration 10-0847067

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to preheat the livestock wastewater sufficiently without using a separate heat source in treating the livestock wastewater in a distillation method without biological treatment, so that rapid and effective evaporation is achieved. As well as being possible, the purpose is to provide a livestock wastewater treatment system that can be reliably condensed vaporized livestock wastewater without a separate condenser to distill and purify the livestock wastewater in a very simple configuration.

Another object of the present invention, there is no fear that the condensation defect of the evaporated livestock wastewater is not generated, and the unevaporated liquid wastewater can be easily re-evaporated without a separate auxiliary treatment means can greatly simplify the configuration, installation and It is to provide a livestock wastewater treatment system that can significantly lower operating costs.

Another object of the present invention is to prevent sludge in the wastewater from adhering to the inner wall of the wastewater flow path due to high temperature heating, thereby minimizing the possibility of occurrence of evaporation defects, and thereby treating livestock wastewater stably. To provide a system.

Livestock wastewater treatment system according to the present invention for achieving the above object comprises an evaporation unit having a wastewater flow path and a steam flow passage in contact with each other to evaporate the waste water by heat exchange with steam; A preheater configured to preheat the wastewater supplied to the evaporator by being provided such that the steam passage through which the waste water has been heat-exchanged with the wastewater in the evaporator and the wastewater passage through which the wastewater is supplied from the outside contact each other; A defoaming part for separating bubbles in the waste water vapor vaporized in the evaporation part; A washing unit including a plurality of perforated plates at predetermined intervals on an internal flow path, and purifying the waste water vapor passing through the defoaming unit; And a waste heat recovery supply unit for supplying the waste water vapor discharged from the washing unit to the steam flow path of the evaporation unit by a waste heat circulation blower to exchange heat with the waste water supplied from the outside. After exchanged with the new wastewater introduced into the evaporator through the aspiration and the cleaning unit, and heat exchanged with the new wastewater introduced into the evaporation unit, the condensation may be performed while exchanging heat with the wastewater introduced into the preheater.

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In the evaporator and the preheating unit, steam and wastewater vapor move from the top to the bottom, and the wastewater moves from the bottom to the top to exchange heat with each other, thereby effectively evaporating the wastewater.

In addition, the condensed water generated by heat exchange with the wastewater in the evaporator is preferably supplied to the steam flow path of the preheater together with the wastewater vapor supplied to the preheater to contribute to the preheating of the wastewater.

The liquid wastewater separated from the wastewater vapor in the vesicle section may be evaporated in the evaporator by being fed back to the evaporator and mixed with the wastewater supplied from the preheater.

The evaporator and the preheater include a heat exchanger, and the heat exchanger includes a cylindrical body having a wastewater inflow chamber and a wastewater steam discharge chamber at a lower side and an upper side of the heat exchange chamber constituting the steam flow passage, and a heat exchange chamber so that the wastewater inflow chamber and the wastewater steam discharge chamber communicate with each other. It is provided with a plurality of wastewater tubes penetrating through the wastewater passage.

On the other hand, the inner wall of the waste water tube may be attached to the sludge contained in the waste water, preferably the present invention may further include a washing unit for removing the sludge attached to the waste water tube.

The washing unit may include a plurality of washing rods inserted into each wastewater tube with a plurality of scrapers scraping the inner wall of the wastewater tube at predetermined intervals, and an actuator for elevating the washing rods by a predetermined stroke.

The scraper can be configured in various forms. It is an annular spring that elastically adheres to the inner wall of the wastewater tube so that the inner wall of the wastewater tube can be reliably scratched and the sludge removed can be attached to the scraper as much as possible. It is preferred to be configured.

The heat exchanger of the evaporator is provided with a vapor dispenser for radially supplying waste steam and steam at a plurality of positions in the upper part of the heat exchange chamber. You can do it.

According to the livestock wastewater treatment system of the present invention, the livestock wastewater can be easily purified by distillation by heating and separating the livestock wastewater into a gaseous state, and condensing it back into a liquid phase. The cost can be reduced.

In particular, in the treatment of livestock wastewater by distillation, the waste heat of the vaporized livestock wastewater is recovered and used for preheating and evaporation of the wastewater, so unlike the conventional method, it is possible to exclude the use of a separate heat source for preheating the wastewater. In addition, since the condensed into the liquid phase at the same time in the process of evaporating the waste water through heat exchange with the waste water can be reliably condensed and purified without a separate condenser.

As a result, the livestock wastewater can be effectively distilled and purified in a very simple configuration as compared to the conventional one, and the generation of steam for evaporation can be minimized, so that the cost of installation and operation can be greatly reduced. It becomes possible.

In addition, there is no fear of condensation defects as the livestock wastewater is evaporated while recovering and circulating vaporized wastewater vapor, and unevaporated liquid wastewater is supplied back to the evaporator and mixed with the preheated wastewater to evaporate repeatedly. It is possible to evaporate easily and reliably without auxiliary treatment means. This greatly simplifies the configuration of the processing system, resulting in lower installation and operating costs.

In addition, since the scraper for removing sludge attached to the inner wall of the wastewater tube is composed of a ring-shaped spring, the scraper in the wastewater due to the high temperature heating is scraped by reciprocating along the axial direction while being elastically in close contact with the inner wall of the wastewater tube. It can be reliably prevented from being attached to the inner wall.

As a result, there is little concern about the blockage of the wastewater tube due to the sludge sticking and the resulting evaporation defect, so that the livestock wastewater can be treated stably.

1 is a block diagram showing a livestock wastewater treatment system according to the present invention,
2 is a system diagram showing a livestock wastewater treatment system according to the present invention;
3 is a partially enlarged cross-sectional view showing a preheater of the livestock wastewater treatment system according to the present invention;
4 is a cross-sectional view taken along the line IV-IV of FIG.
5 is a partially enlarged side view showing an evaporator of a livestock wastewater treatment system according to the present invention;
6 is a cross-sectional view taken along the VI-VI line of FIG.
7 is a cross-sectional view showing a defoaming machine of the livestock wastewater treatment system according to the present invention;
8 is a cross-sectional view of the evaporator showing a washing unit of the livestock wastewater treatment system according to the present invention,
Figure 9 is an enlarged side view showing a washing rod of the washing unit of the present invention,
10 is a plan view of the cleaning rod scraper taken along the line VII-VII of FIG. 9;
Figure 11 is a perspective view of the cleaning rod scraper of the present invention,
12 is a plan view showing a washing rod fixing plate of the washing unit of the present invention,
Figure 13 is a cross-sectional view showing an operating state of the washing unit according to the present invention.

Specific features and other advantages of the livestock wastewater treatment system according to the present invention will become more apparent from the following description of the preferred embodiment with reference to the accompanying drawings.

1 and 2, the livestock wastewater treatment system according to the present invention includes an evaporator 20 for evaporating the wastewater by heat exchange with steam having a wastewater flow passage and a steam flow passage in contact with each other, and the evaporator 20 The preheating unit 10 and the evaporator 20 which preheat the wastewater supplied to the evaporator 20 are provided to be in contact with each other, and the steam passage through which the steam having undergone heat exchange with the wastewater and the wastewater passage supplied from the outside is mutually contacted. Vesicle section 30 for separating the bubbles in the waste water vapor evaporated in), a washing section 40 for neutralizing the waste water vapor removed by the vesicle 30, and discharged from the washing section 40 It comprises a waste heat recovery supply unit 50 for supplying the waste water vapor to the steam flow path of the evaporator 20 to heat exchange with the waste water supplied from the outside.

The preheater 10 receives low temperature wastewater from a livestock wastewater storage unit (not shown) provided outside by the wastewater supply pump 18, and receives hot steam and wastewater steam from the evaporator 21 described later. A preheater 11 is provided as a heat exchanger for preheating wastewater through heat exchange between the two.

Although only one preheater 11 may be provided, it is preferable to have at least two pieces of small capacity for more efficient preheating.

This is because the preheater 11 of the present invention preheats the steam and wastewater steam which has undergone heat exchange with the wastewater first in the subsequent evaporator 21, so that the low-temperature wastewater supplied from the outside may be several preheaters 11 having a small capacity. This is because preheating by dispersing) ensures a smooth heat exchange between the two to obtain a higher preheating efficiency and at the same time improves the condensation efficiency of the waste water vapor.

The preheater 11 may be configured in various forms. For example, as shown in FIGS. 3 and 4, low-temperature wastewater from the outside of the heat exchange chamber 13 functioning as a flow path for steam and waste steam is shown. A cylindrical main body 12 having a wastewater inflow chamber 14 to be supplied and having a wastewater discharge chamber 15 for preheating the wastewater to the evaporator 21 above the heat exchange chamber 13. And a plurality of wastewater tubes 16 which pass through the heat exchange chamber 13 of the main body 12 and communicate with the wastewater inflow chamber 14 and the wastewater discharge chamber 15 to function as wastewater flow paths. .

The heat exchange chamber 13, the wastewater inlet chamber 14, and the wastewater discharge chamber 15 are formed by partitioning the inside of the main body 12 by baffles 17, and each baffle 17 is a wastewater tube 16. Opposite ends of the plurality of mounting holes 17a are fitted.

The plurality of wastewater tubes 16 are preferably arranged with a gap therebetween so that each of the wastewater tubes 16 evenly contacts steam and wastewater vapor passing through the heat exchange chamber 13 so as to perform a smooth heat exchange.

The lower part of the heat exchange chamber 13 of the preheater 11 has a condensate discharge pump 19 for discharging the condensed water generated by condensation of hot steam and waste water vapor through the heat exchange with the low temperature wastewater in the preheater 11. Are respectively connected.

The evaporator 20 includes an evaporator 21 as a heat exchanger for further heating and evaporating the preheated wastewater supplied from the preheater 11 with high temperature steam and wastewater steam, and supplying steam to the evaporator 21. It is provided with a steam generator 29 for.

The evaporator 21 may also be configured in various forms, for example, may be configured in the same configuration as the preheater 11 described above.

That is, as shown in FIGS. 5 and 6, a wastewater inflow chamber 24 through which the preheated wastewater is supplied from the preheater 11 is provided below the heat exchange chamber 23 that functions as a flow path for steam and wastewater steam. The main body 22 of the cylindrical shape which is installed vertically with the waste water vapor discharge chamber 25 which the vaporized waste water vapor | steamed to the defoaming machine 31 mentioned later on the upper side of the chamber 23, and this main body 22 of The wastewater inlet chamber 24 and the wastewater vapor discharge chamber 25 communicate with each other through the heat exchange chamber 23 to provide a plurality of wastewater tubes 26 serving as wastewater flow paths.

The heat exchange chamber 23, the wastewater inlet chamber 24, and the waste steam discharge chamber 25 are formed by dividing the inside of the main body 22 into baffles 27, and each baffle 27 is formed of wastewater tubes 26. Both ends are correspondingly provided with a plurality of assembling holes 27a, each of which is fitted and joined.

In addition, the plurality of wastewater tubes 26 are arranged with a gap therebetween so that each of the wastewater tubes 26 evenly contacts steam and wastewater vapor passing through the heat exchange chamber 23 to achieve a smooth heat exchange.

The evaporator 21 has a capacity for accommodating all preheated wastewater simultaneously supplied from each preheater 11, and a vapor dispenser for uniformly supplying steam and waste water vapor to the heat exchange chamber 23 in the evaporator 21. (28) is provided together.

The steam dispenser 28 is composed of a ring-shaped duct or channel installed to surround the outer circumference of the evaporator 21 and can be joined to the main body 22, and is connected to the discharge side of the waste heat circulation blower 51 to be described later. And steam are supplied, and a plurality of steam supply holes 23a are radially formed at a predetermined angle in the evaporator body 22 at a portion in contact with the steam dispenser 28.

The steam generator 29 may be formed of, for example, a steam boiler, and a plurality of steam generators may be provided. This means that each steam generator 29 is operated at the initial stage of the operation of the system, thereby rapidly heating the evaporator 21 to a predetermined temperature required for evaporation, and accordingly, the waste heat recovery supply unit 50 described later, which generates waste water vapor. When the waste heat circulation blower 51 of) is supplied to the evaporator 21, the operation is stopped in a stepwise manner to operate with minimal steam generation.

Steam generator 29 may be directly connected to the heat exchange chamber 23 of the evaporator 21, but is preferably connected to the waste steam resupply line supplied to the evaporator 21 by the waste heat circulation blower (51) to separate Excluding the supply pump, it is configured to supply both waste steam and steam to one waste heat circulation blower (51).

On the other hand, such a preheater 11 and the evaporator 21 is effective to move the steam and waste water downwards from the top of each heat exchange chamber 13, 23, so that the waste water is moved from the bottom up so that excellent heat exchange efficiency. to be.

To this end, the steam dispenser 28 is installed at an upper side of the heat exchange chamber 23 of the evaporator 21 to supply waste water vapor and steam to the upper part of the heat exchange chamber 23, and a lower portion of the heat exchange chamber 23 of the evaporator 21 is provided. The preheater 11 is connected to the upper part of the heat exchange chamber 13.

Accordingly, since waste water vapor and steam try to stay in the upper portion of the heat exchange chambers 13 and 23 for a long time due to convection, the heat exchange is intensively performed at the highest temperature, so that the evaporation can be surely performed.

The defoaming part 30 may have any form as long as it can separate the bubbles contained in the vaporized waste water vapor in the evaporator 21. Preferably, the defoaming part 30 can exhibit excellent separation performance even at high temperature and high pressure as shown in FIG. It may be composed of a cyclone centrifugal defoamer 31.

That is, the defoaming machine 31 is provided in the tangential direction eccentrically with the inflow pipe 33 into which waste water vapor flows into the upper outer periphery of the cyclone tube 32 whose lower part is formed in a conical shape. Accordingly, the waste water vapor supplied to the inlet pipe 33 forms a swirling air flow along the inner circumference of the cyclone tube 32 so that the bubbles in the waste water vapor collide with the inner wall of the cyclone tube 32 by centrifugal force and flow down into the liquid phase. Discharged to the wastewater discharge pipe 35, the wastewater vapor may be discharged through the steam discharge pipe 34 provided in the upper center of the cyclone pipe (32).

The defoaming machine 31 may be provided with an air vent 36 for automatically discharging part of the waste water vapor to stabilize the system when the pressure generated by the waste heat circulation blower 51 is greater than or equal to a predetermined pressure. .

Only one such defoaming machine 31 may be provided, but may be composed of a first defoaming machine 31a and a second defoaming machine 31b that are sequentially connected in order to more surely separate bubbles from the waste water vapor.

The cleaning unit 40 may include a cleaning tank 41 for removing and purifying the odor of waste water vapor from which the bubble is removed from the defoaming machine 31. The cleaning tank 41 has a cylindrical shape and is installed vertically, and waste water vapor flows into the lower portion thereof and takes a structure discharged from the upper portion.

A plurality of perforated plates 42 formed with a plurality of through holes (not shown in the drawing) may be alternately arranged at regular intervals along the vertical direction, and the perforated plates 42 may collide with the waste water vapor. The deodorant or the like, which may be introduced into the cleaning tank 41, may be more easily mixed with the waste water vapor, and may also cause a collision with the remaining bubbles not separated from the defoaming machine 31 to be surely separated. Can be.

Waste heat recovery supply unit 50 is provided with a waste heat circulation blower 51 for supplying the waste water vapor discharged from the cleaning tank 41 to the heat exchange chamber 23 of the evaporator 21, the waste heat circulation blower 51 is a suction port 52 is connected to the outlet of the cleaning tank 41, and the discharge port 53 is connected to the vapor dispenser 28 of the evaporator 21.

Meanwhile, the present invention further includes a wastewater resupply unit 60 for resupplying the liquid wastewater separated from the wastewater vapor in the defoaming unit 30 to the evaporator 20 again.

Wastewater resupply unit 60 is connected to the wastewater discharge pipe 35 of the defoaming machine 31 is connected to the wastewater inlet chamber 24 of the evaporator 21, and the wastewater separated from the wastewater vapor and the heated wastewater supplied from the preheater 11 and A wastewater recovery supply pump 61 for mixing can be provided to re-evaporate unevaporated wastewater separated from the wastewater vapor.

The present invention may further include a condensate level control unit 70 for maintaining the water level of the condensate condensed in the liquid phase to a predetermined level or less by heat-exchanging the waste water vapor with the heated wastewater in the evaporator 21.

That is, part of the waste water vapor discharged from the cleaning tank 41 and supplied to the evaporator 21 is condensed into the liquid phase while evaporating the waste water through heat exchange with the heated waste water. When the water is collected above a certain level, the evaporation efficiency of the waste water is not only lowered, but also the waste water vapor after heat exchange with the waste water can be prevented from being supplied to the preheater 11, so it is necessary to maintain the condensate level below a predetermined level. It is.

To this end, the condensate water level control unit 70 is connected to the lower part of the heat exchange chamber 23 of the evaporator 21 and the upper part of the heat exchange chamber 13 of the preheater 11 to pump the condensate into the heat exchange chamber 13 of the preheater 11. A condensate recovery pump 71 may be provided.

The condensate recovery pump 71 may be directly connected to the heat exchange chamber 23 of the evaporator 21, and as illustrated, the condensate tank 72 may be connected to the heat exchange chamber 23 of the evaporator 21 to collect condensate. In addition, the condensate may be pumped to the preheater 11 according to the level of the condensate tank 72.

When the present invention treatment system is operated for a certain period of time, the concentrated wastewater containing a large amount of sludge may be accumulated in the wastewater inlet chamber 14 of the preheater 11 and the wastewater inlet chamber 24 of the evaporator 21. Thus, the concentrated water collected in the wastewater inlet chambers 14 and 24 may be discharged at suitable intervals by the concentrated water discharge pump 80, and the discharged concentrated water may be recycled as a concentrated fertilizer without being disposed of as a highly concentrated organic matter.

Meanwhile, in the present invention, sludge-containing livestock wastewater is purified by distillation, and sludge adhesion due to high temperature is formed on inner walls of the preheater 11 and the wastewater tubes 16 and 26 of the evaporator 21 where heat exchange is performed. It is easy to occur.

In this case, the sludge attached to the inner walls of the wastewater tubes 16 and 26 not only prevents the wastewater from flowing smoothly, but also lowers the heat exchange efficiency with the wastewater vapor, thereby making it impossible to reliably distill the wastewater.

Accordingly, the present invention further comprises a washing unit 90 for removing the sludge attached to the inner wall of the waste water tubes 16 and 26.

9 to 13, the washing unit 90 includes a plurality of washing rods 91 inserted into each wastewater tube 16 and 26, and a cylinder 93 for elevating the washing rods 91 by a predetermined stroke. It is provided. Each washing rod 91 is in close contact with the inner wall of the wastewater tubes 16 and 26, and is lifted by the cylinder 90, thereby forcing a plurality of scrapers 92 to scrape the inner walls of the wastewater tubes 16 and 26 at regular intervals. To have.

The cleaning rod 91 may simply be made of a metal rod, or may be manufactured by spirally twisting an elastic wire to have an appropriate elasticity. The spiral rod may provide an appropriate elasticity when lifting and lowering the cylinder 93 to remove sludge. Is more effective.

The scraper 92 may be configured in various forms, but as shown in the drawing, a ring-shaped spring capable of freely tilting in any direction while maintaining elastic contact with the inner wall of the waste water tubes 16 and 26. It is preferable that it consists of.

To this end, the scraper 92 is a ring-shaped contact portion 92a in close contact with the inner circumference of the wastewater tubes 16 and 26 and a fixing portion 92b wound around the outer circumference of the washing rod 91 via the bush 94. And the connecting portion 92c connecting the contact portion 92a and the fixing portion 92b has a substantially spiral shape. Therefore, the contact portion 92a may be freely tilted with respect to the fixing portion 92b while being in close contact with the waste water tubes 16 and 26.

Accordingly, not only sludge that is simply attached to the inner wall of the wastewater tubes 16 and 26 can be effectively removed, but also sludge that is relatively strongly fixed can be prevented from being attached to the inner wall of the wastewater tubes 16 and 26. The waste water can be distilled and treated continuously and stably.

Although the scraper of the present invention is not shown separately, it may be composed of a conical spring or a metal brush.

On the other hand, each of the washing rods 91 is fixed to the upper end is fixed to the fixing plate 95, which is accommodated in the wastewater discharge chamber 15 and the wastewater steam discharge chamber 25 of the preheater 11 and the evaporator 21, The cylinder 93 is lifted and lifted at the same time by lifting the stationary plate 95 to clean the respective wastewater tubes 16 and 26.

The cleaning rod fixing plate 95 has a plurality of fastening holes 95a for fixing the cleaning rod 91 and a plurality of passage holes 95b through which heating waste water or waste water vapor can pass.

Next, the operation | movement of the livestock wastewater treatment system by this invention comprised in this way is demonstrated.

First, the wastewater supply pump 18 is operated to fill the wastewater through the preheater 11 to the wastewater tube 26 of the evaporator 21 to a predetermined level, and to operate all of the steam generators 29. Subsequently, when the steam generated by the steam generator 29 reaches a predetermined temperature, the waste heat circulation blower 51 is operated to supply steam to the heat exchange chamber 23 through the steam dispenser 28 of the evaporator 21.

The steam supplied to the heat exchange chamber 23 of the evaporator 21 is partially condensed and partially supplied to the heat exchange chamber 13 of the preheater 11 while exchanging heat with the waste water filled in the evaporator 21 and its wastewater tube 26. And condensed while exchanging heat with the wastewater supplied into the preheater (11). At this time, a part of the wastewater filled in the wastewater tube 26 of the evaporator 21 is evaporated, and the wastewater vapor thus evaporated is supplied to the heat exchange chamber 23 of the evaporator 21 by the waste heat circulation blower 51.

Accordingly, the preheater 11 and the evaporator 21 are heated to gradually increase the temperature, and the amount of the evaporated waste water vapor is also gradually increased. Then, even if the operation number of the steam generator 29 is gradually reduced in accordance with the supply amount of the waste steam, the temperature of the evaporator 21 can maintain a predetermined temperature necessary for evaporation.

In more detail, in the initial operation of the system, the waste water is evaporated by heat exchange with steam supplied from the steam generator 29, and the high-temperature waste water vapor is evaporated and supplied to the evaporator 21 again so that The waste water is evaporated by heat exchange with the waste water, and condensed at the same time to be purified, and the number of operations of the steam generator 29 can be reduced according to the amount of evaporated waste water vapor.

The waste water vapor evaporated in the evaporator 21 is bubbled by centrifugal separation in a subsequent defoaming machine 31 and then supplied to the cleaning tank 41 to remove odors and the like by chemical treatment.
The purified waste steam discharged from the washing tank 41 is supplied to the heat exchange chamber 23 through the steam dispenser 28 of the evaporator 21 by the waste heat circulation blower 51 and then preheated from the preheater 11. After the heat exchange with the wastewater to evaporate the wastewater, the low-temperature wastewater supplied to the heat exchange chamber 13 of the preheater 11 is externally preheated.

At this time, the waste water vapor supplied to the heat exchange chamber 23 through the steam dispenser 28 of the evaporator 21 is supplied through the steam supply hole 23a formed radially from the outer wall of the evaporator 21, so that it is uniform without being biased. One heat source can be supplied to the heat exchange chamber, and part of the waste water vapor is condensed by heat exchange with the heated waste water, and part of the waste water vapor is supplied to the preheater 11 in the form of steam or liquid at low temperature, thereby exchanging heat with the low temperature waste water. Condensation.

The waste water circulated in this way is finally condensed at the bottom of the preheater 11 through heat exchange while passing through the evaporator 21 and the preheater 11 in turn, and the condensate is purified by the distillation effect, and the condensate discharge pump It is discharged by (19) and can be used, for example, for agricultural water.

On the other hand, the liquid wastewater separated from the wastewater vapor in the defoaming machine 31 is re-supplied to the wastewater inlet chamber 24 of the evaporator 21 by the wastewater recovery pump 61, and thus the heating supplied from the preheater 11 It may be mixed with the waste water and vaporized while passing through the heat exchange chamber 23 of the evaporator 21 again.

As such, the present invention can effectively preheat and evaporate wastewater without a separate heat source, as well as vaporized wastewater vapor can be reliably condensed without a separate condenser. This greatly simplifies the configuration of the processing system, thereby significantly lowering the installation and operation costs.

10: preheater 11: preheater
13 heat exchange chamber 14 wastewater inlet chamber
15: wastewater discharge chamber 16: wastewater tube
20: evaporator 21: evaporator
23: heat exchange chamber 24: wastewater inlet chamber
25: waste steam discharge chamber 26: waste water tube
28: steam dispenser 29: steam generator
30: defoaming part 31: defoaming machine
40: washing unit 41: washing tank
42: perforated plate 50: waste heat recovery supply unit
51: waste heat circulation blower 60: waste water resupply unit
70: condensate level control unit 90: washing unit
91: cleaning rod 92: scraper
93 cylinder 95 washing rod fixing plate

Claims (8)

An evaporator having a wastewater flow passage and a steam flow passage contacting each other to evaporate the wastewater by heat exchange with steam;
A preheater configured to preheat the wastewater supplied to the evaporator by being provided such that the steam passage through which the waste water is heat-exchanged with the wastewater in the evaporator and the wastewater passage through which the wastewater is supplied from the outside contact each other;
A defoaming part for separating bubbles in the waste water vapor vaporized in the evaporation part;
A washing unit including a plurality of perforated plates at predetermined intervals on an internal flow path, and purifying the waste water vapor passing through the defoaming unit; And
A waste heat recovery supply unit configured to supply the waste water vapor discharged from the washing unit to a steam flow path of the evaporation unit by using a waste heat circulation blower to exchange heat with the waste water supplied from the outside;
The high temperature wastewater vapor generated from the evaporator is introduced into the evaporator through the vesicle and the washing unit, and then heat exchanged with the new wastewater introduced into the evaporator, and then is returned to the preheater to exchange heat with the wastewater introduced into the preheater from the outside. Livestock wastewater treatment system, characterized in that the condensation.
delete The method according to claim 1,
Livestock wastewater treatment system, characterized in that the condensed water generated by heat exchange with the wastewater in the evaporator unit to the steam flow path of the preheater unit together with the wastewater steam supplied to the preheater.
The method according to claim 1,
The liquid wastewater separated from the vesicle portion is re-supplied to the evaporator and mixed with the wastewater supplied from the preheater.
The method according to claim 1, wherein the evaporator and preheating unit,
A cylindrical body having a wastewater inlet chamber and a wastewater vapor discharge chamber at a lower side and an upper side of the heat exchange chamber constituting the steam passage, and a plurality of wastewater flow passages passing through the heat exchange chamber so that the wastewater inlet chamber and the wastewater steam discharge chamber communicate with each other. Livestock wastewater treatment system comprising a heat exchanger having a wastewater tube.
The method according to claim 5,
It further comprises a washing unit having a plurality of washing rods inserted into each waste water tube having a plurality of scrapers scraping the inner wall of the waste water tube at predetermined intervals, and an actuator for lifting and lowering the washing rods in a predetermined stroke. Livestock wastewater treatment system.
The method according to claim 6,
Livestock wastewater treatment system, characterized in that the scraper is made of an annular spring elastically in close contact with the inner wall of the wastewater tube.
The method according to claim 1 or 5,
And a steam dispenser for radially supplying waste water steam and steam at a plurality of positions in an upper portion of the heat exchange chamber in the heat exchanger of the evaporator.

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