JP3981674B2 - High load wastewater treatment system - Google Patents

Description

  The present invention relates to a treatment system for concentrating so-called high-load wastewater containing harmful substances and having a high environmental load.

  For example, a painting process of an automobile includes a washing process after painting, and a large amount of water is used. The water used in this step has a high BOD and COD value and cannot be discarded if left untreated. For this reason, currently, a processing fee calculated from a unit price per ton of wastewater and a processing amount is paid to the processing company, and the wastewater is collected as it is. However, the treatment unit price is high and the amount of wastewater is large, so there is a problem that the treatment fee becomes very expensive, which is a heavy burden.

  Therefore, it is conceivable to remove water contained in high-load wastewater such as industrial wastewater to some extent, and concentrate and reduce the volume of wastewater. So-called evaporative concentration equipment that heats and evaporates the wastewater is proposed. Has been. Many devices designed to evaporate and concentrate such waste water to be treated have been devised to increase heat efficiency and reduce energy consumption by circulating heat in the system, and Among them, a technique disclosed in Japanese Patent Application Laid-Open No. 5-115857 can be cited as one that can treat wastewater to be treated with particularly high efficiency. In this process, wastewater to be treated is heated under reduced pressure in a treatment tank, evaporated and reduced in volume, and condensed water is evaporated between the heat medium before heating to heat the treatment target water. It is configured so that the condensed water can be reused while being exchanged and preheated to improve thermal efficiency. According to this apparatus, since the waste water to be treated can be evaporated by heating at a relatively low temperature, the waste water can be concentrated with high heat efficiency and treatment efficiency, and the condensed water condensed with the evaporated water can be washed. Etc. can be reused. However, the technical matters regarding the heating unit are not disclosed in the technology of the conventional processing apparatus such as those, and the BOD can be obtained by the apparatus as described above employing a heater such as a generally known heat exchanger. , COD, n-hexane extract material, ph, ss, etc., when so-called high-load wastewater is to be treated, the corrosiveness is further enhanced by heating and concentration of the wastewater to be treated. There was a problem that the hot part for heating was easily corroded and could not withstand long-term use. In addition, it was necessary to take countermeasures against corrosion of the pump to reduce the pressure.

Moreover, as a heat exchanger excellent in corrosion resistance, there is a technique disclosed in JP-A-10-81930. By adopting a heating part formed of an alloy having excellent corrosion resistance, a heat exchanger having relatively high corrosion resistance and excellent thermal conductivity can be obtained. However, when such a heat exchanger is used as a heating mechanism of an evaporating and concentrating apparatus for treating high-load wastewater as described above, elution of a heating part made of an alloy is avoided depending on the type of wastewater to be treated. The problem is that metal ions are generated in the wastewater to be treated and secondary treatment is required, and the heating part is severely deteriorated and damaged, requiring repeated maintenance. There was a problem that it took a long time. In addition, in the case of such a treatment method or apparatus, there is a problem that the running cost is high, and if the waste water further concentrated after the treatment is collected by the treatment contractor, the total treatment cost becomes high and cannot be paid. .
Japanese Patent Laid-Open No. 5-115857 JP-A-10-81930

  The present invention has been made in view of the conventional problems as described above, and does not corrode treatment equipment due to high-load wastewater, has extremely high durability, and enables high-efficiency and low-cost continuous treatment of wastewater. It is intended to provide a wastewater treatment system.

Means that the invention is taken in order to solve the above problems, a waste water treatment tank, a dosing means provided with inflow path and the inflow amount adjusting function for inputting processed wastewater unprocessed this tank , A process comprising bundling a fluororesin tube that is arranged so that at least a part thereof is in contact with the wastewater contained in the tank and allows vapor obtained from an arbitrary high-temperature heat source to pass therethrough A heating means for heat-treating the target wastewater; an outflow path for taking out the treated wastewater that has been treated in the tank and concentrated to a predetermined concentration; and an extraction means having an outflow amount adjusting function; Steam that is vaporized and separated by heating the wastewater to be treated is collected and condensed to produce separated water, and the steam is disposed inside a cooling pipe that is arranged with a descending gradient and that has an outer surface covered with a water absorbent. Pass through and below A water pipe having holes penetrating inside and outside at an appropriate interval is disposed along the cooling pipe at the top of the cooling pipe, and water is dropped into the cooling pipe through the water through the water pipe. A separation water generating means configured as described above, and in the wastewater treatment tank, the waste water to be treated contained in the tank is heated and vaporized by the heating means, and the wastewater treatment tank accommodated in the tank The water content of the waste water is reduced and concentrated, and the vapor separated by vaporizing the waste water is collected and condensed by the separated water generating means to extract the separated water so that the waste water has a predetermined concentration. The feeding means and the taking-out means are adjusted so that the feeding speed and the taking-out speed are adjusted to predetermined amounts so that they can be processed continuously.

  According to the present invention, the heater portion that is heated in contact with the high-load wastewater is made of fluororesin, so there is almost no corrosion due to acid or alkali contained in the high-load wastewater, and it can withstand long-term use and does not require excessive maintenance. There is an effect that can be. Also, the fluororesin heater part can avoid adhesion and seizure of impurities even at high temperatures and prevent a decrease in the heat exchange rate. On the other hand, in a stainless steel heat exchanger, impurities adhere to the surface and seize and heat exchange. The area may decrease.

  In addition, unlike a method using electrical resistance heat generation or a method in which the waste water to be treated contained in the treatment tank is directly heated by a boiler provided in the treatment apparatus, a thermal fluid such as water vapor obtained from an arbitrary high-temperature heat source is used. By using a heat exchange system that heats the wastewater to be treated by passing the tube through a fluororesin tube as a heating means, waste heat generated in the factory can be used. There is an effect that the running cost for waste water treatment can be suppressed.

  Moreover, since the waste water to be treated can be treated continuously, there is an effect that the treatment operation rate can be enhanced.

  In addition, there is an effect that the separated water obtained by vaporization and separation from the waste water to be treated can be reused as industrial water, and the amount of new water used can be reduced.

  In addition, water can be separated from the wastewater to be treated, and the wastewater can be concentrated to reduce the amount of waste, so that the amount of discharge can be reduced, and the processing cost paid to the processing contractor can be reduced, including the above effects. As a result, there is an effect that the total cost required for treatment of the wastewater to be treated can be compressed.

  A preferred embodiment of the present invention will be described below in detail with reference to the drawings. 1 is a diagram showing the concept of the entire system of the present invention, FIG. 2 is a diagram showing the configuration of the heating means in the apparatus of the present invention, FIG. 3 is a diagram showing the AA ′ cross section of FIG. FIG. 3 is a view showing a BB ′ cross section of FIG. 2.

  As shown in FIG. 1, the high load wastewater treatment apparatus according to the present embodiment treats raw water (V), that is, a storage tank (1) for containing untreated waste water to be treated, and raw water (V). Processing tank (2) for removing the raw water (V) from the storage tank (1) and transferring it to the processing tank (2) and the processing tank (2) Inflow amount adjusting means (4) provided on the inflow path (3) for adjusting the amount of raw water (V) and heat treatment vaporization treatment of waste water (W) to be treated in the treatment tank (2) Heating means (5), a flow passage (6) for passing a hot fluid through the heating means (5), and steam vaporized by heating in the treatment tank (2) and separated from the waste water (W) For removing the steam from the treatment tank (2), and separated water generating means for collecting and condensing the steam taken out by the steam taking means (7) ( ), An outflow path (9) for taking out the waste water which has been evaporated and removed in the treatment tank (2) and concentrated to a predetermined concentration, and the treatment tank (2) ) For adjusting the amount of concentrated waste water (X) to be taken out from the outflow channel (9) for adjusting the amount of concentrated waste water (X) and the concentration for temporarily storing the concentrated waste water (X) And a waste water storage tank (11).

  The storage tank (1) is a tank having an appropriate volume for storing raw water (V) that is untreated processing target wastewater, and the processing target wastewater discharged from a factory or the like is introduced into the tank in a timely manner. Configured to get. The storage tank (1) preferably has corrosion resistance and robustness that can be maintained for a long time even if the wastewater to be stored is highly corrosive wastewater, and the surroundings are reinforced with concrete or the like. It is desirable to configure.

  The treatment tank (2) is a stainless steel tank having an appropriate volume, and an inlet (12) for the wastewater to be treated and an outlet (13) for taking out the concentrated wastewater (X) below the tank. It has a discharge port (14) for discharging vapor separated by heating and vaporization to the outside of the processing tank (2) at the upper part of the tank, and heating means (5) is arranged at the upper part of the tank. Is done. Of course, the treatment tank (2) is resistant to high-load wastewater at high temperatures and can be accommodated for a long period of time, efficiently exchanging heat, vaporized and separated from wastewater, and concentrated. Wastewater can be removed from the treatment tank (2) efficiently, and the shape, inlet (12), outlet (13), outlet (14) and heating means (5) are installed. The position and the like can be appropriately selected.

  The inflow channel (3) is composed of a pipe formed of a material having high corrosion resistance against high-load wastewater, and one end thereof is arranged at a position lower than the surface of the raw water (V) accommodated in the storage tank (1). The other end is connected to the inlet (12) of the treatment tank (2). It is preferable that an inflow amount adjusting means (4) for adjusting the amount of waste water to be treated transferred from the storage tank (1) to the treatment tank (2) is provided on the inflow channel (3).

  The inflow rate adjusting means (4) preferably circulates in the inflow channel (3) with a pump (15) for pumping raw water from the storage tank (1) and sending it to the treatment tank (2). An inflow control valve (16) that can adjust the amount of raw water (V) and the amount of waste water (W) stored in the treatment tank (2), if there is too much, waste water is stored in the storage tank (1). A level controller (17) for adjusting to a predetermined amount so as to return is provided on the inflow path (3).

  As shown in FIG. 2 and FIG. 3, the heating means (5) has a plurality of fluororesin tubes (18) aligned at both ends and bound together, and each of the bound ends is formed into one opening. In summary, in the treatment tank (2), the waste water (W) to be treated contained in the treatment tank (2) is in contact with the outer surface of the tube (18), and an arbitrary high-temperature heat source The thermal fluid obtained from is passed through each of the tubes (18), and the heat of the thermal fluid is transferred to the waste water (W) accommodated in the treatment tank (2) via the tubes (18). Thus, the waste water (W) can be efficiently heated and vaporized. Furthermore, when the heating means (5) is hidden in the waste water (W) in the treatment tank (2), the purpose of preventing floating of the heating means (5) due to buoyancy, waste water flow, etc. It is desirable to fix the heating means (5) using a support member (19) or the like. By configuring the heating means (5) as described above, heat exchange can be performed with high efficiency, and high corrosion resistance and environmental stress cracking due to high-load wastewater at high temperatures can be obtained for long-term use. It is possible to endure even. An air jet pipe (31) is arranged below the heating means (5), and air is jetted downward from the jet pipe (31) to promote stirring and evaporation of the wastewater and foreign matter on the surface of the heating means. To prevent adhesion.

  The flow path (6) allows the hot fluid to flow from the position where the hot fluid generated by heating by an arbitrary hot heat source is generated to the heating means (5), and introduces the hot fluid into the heating means (5). However, the present invention is not limited to this, and of course, as long as the hot fluid can be conducted into the heating means (5). Good. Further, it is possible to provide a valve as a flow rate adjusting means (20) for adjusting the amount of the thermal fluid conducted into the heating means (5) through the flow passage (6).

  The steam take-out means (7) discharges steam that has been vaporized by heating and separated from the waste water (W) in the treatment tank (2) from the treatment tank (2) to the discharge port (2) provided in the treatment tank (2). 14), the fan can be a conventionally known technique and is not particularly limited. Further, the fan as the vapor extraction means (7) does not necessarily have to be present, and may or may not be selected as appropriate, but it is preferable to attach the fan because the concentration efficiency can be increased.

  As shown also in FIG. 4, the separated water generating means (8) is for collecting and condensing the steam taken out by the steam taking out means (7) to obtain separated water (Z). The pipe (21) having a predetermined length is disposed with a descending gradient, and the outer surface of the pipe (21) is covered with a water absorbent body (22) such as cloth to form a cooling pipe (23). From the upper opening (24) toward the lower opening (25), the steam extracted from the processing tank (2) by the steam extraction means (7) is allowed to pass through the cooling pipe (23). A water pipe (27) provided with holes (26) penetrating inside and outside at an appropriate interval in the lower part is disposed above the cooling pipe (23) along the cooling pipe (23). The cooling water (Y) () is passed through the water pipe (27) through the hole (26) and dropped into the cooling pipe (23), and the cooling pipe A vertical pipe (28) oriented in a substantially vertical direction is arranged in the lower opening (25) of (23) to finally separate the gas and moisture contained in the steam, and the lower end of the vertical pipe (28) The separated water storage tank (29) is arranged at the top, and an umbrella (30) for preventing rainwater and the like from entering the vertical pipe (28) is arranged at the upper end from the water pipe (27). The cooling water (Y) () dripped and absorbed by the water absorbing body (22) applied to the outer surface of the cooling pipe (23) is then heated with the heat of steam passing through the cooling pipe (23). The steam exchanged between the two pipes is vaporized, and the steam flowing through the cooling pipe (23) is cooled and condensed before passing through the cooling pipe (23). ) Can be obtained.

  The outflow channel (9) is composed of a corrosion-resistant pipe against high-load wastewater at high temperatures, and the treatment tank (2) is used to take out the wastewater concentrated in the treatment tank (2) to the outside of the treatment tank (2). One end is connected to the outlet (13) provided at the lower end of 2), and the other end is arranged so that the concentrated waste water (X) is sent out to the concentrated waste water storage tank (11). On the outflow channel (9), a valve as an outflow rate adjusting means (10) for adjusting the amount of concentrated waste water (X) flowing through the outflow channel (9) can be provided. is there.

  The concentrated waste water storage tank (11) has an appropriate volume for storing the concentrated waste water (X) concentrated to a predetermined concentration in the processing tank (2) until it is delivered to the processing company. It is a stainless steel tank, and it is preferable to have corrosion resistance and robustness that can be retained for a long period of time even if the concentrated wastewater (X) is extremely corrosive. It is desirable to configure.

  In the case of using the apparatus described above, high-load wastewater discharged from a factory or the like is introduced into the storage tank (1), and raw water is pumped out by a pump (15) at a predetermined speed adjusted from there. ) To the treatment tank (2). When the amount of waste water (W) in the treatment tank (2) is adjusted by the level controller (17) and the amount is kept so as to be kept constant, the storage tank (1 ). In the treatment tank (2), heat is exchanged with the wastewater (W) through the heating means (5) using a hot fluid heated by an arbitrary high-temperature heat source, and the wastewater (W) is heated. This heating is performed to a temperature at which the waste water (W) is vaporized, whereby the water contained in the waste water (W) evaporates, and the fan in the treatment tank (2) is vaporized by the steam extraction means (7). Sucked out. The sucked vapor is condensed through the separated water generating means (8) and separated into separated water (Z) and gas, and the separated water (Z) is collected and can be reused. On the other hand, the waste water that has been evaporated in the treatment tank (2) and reduced in water amount and concentrated is continuously discharged while being maintained at a predetermined concentration by adjusting the input amount, evaporation amount, and outflow amount. It is taken out from (13) and drawn out and stored in the concentrated wastewater storage tank (11).

The figure which shows the concept of the whole system of this invention The figure which shows the structure of the heating means in the apparatus of this invention. The figure which shows the AA 'cross section of FIG. The figure which shows the BB 'cross section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage tank 2 Processing tank 3 Inflow path 4 Inflow amount adjustment means 5 Heating means 6 Flow path 7 Steam extraction means 8 Separation water generation means 9 Outflow path 10 Outflow amount adjustment means 11 Concentrated waste water storage tank 12 Inlet 13 Outlet 14 Exhaust Outlet 15 Pump 16 Inflow control valve 17 Level controller 18 Tube 19 Support member 20 Flow rate adjusting means 21 Pipe 22 Water absorber 23 Cooling pipe 24 Upper opening 25 Lower opening 26 Hole 27 Water pipe 28 Vertical pipe 29 Separated water storage Tank 30 Umbrella 31 Air outlet pipe V Raw water W Waste water X Concentrated waste water Y Cooling water Z Separated water

Claims (1)

A wastewater treatment tank;
An input means having an inflow path and an inflow amount adjusting function for introducing untreated wastewater to be treated into the tank,
A treatment target formed by bundling a fluororesin tube that is arranged so that at least a part thereof is in contact with the wastewater contained in the tank and allows vapor obtained from an arbitrary high-temperature heat source to pass therethrough. Heating means for heat treating the waste water;
An outflow path for taking out the treated wastewater treated in the tank and concentrated to a predetermined concentration from the inside of the tank, and an extraction means having an outflow amount adjusting function;
Steam that is vaporized and separated by heating the wastewater to be treated is collected and condensed to generate separated water, and the steam is disposed inside a cooling pipe that is arranged with a descending gradient and has an outer surface coated with a water absorbent. A water pipe having a hole penetrating inward and outward at an appropriate interval in the lower part is disposed at the upper part of the cooling pipe along the cooling pipe, and water is passed through the water pipe from the hole. Separated water generating means configured to be dripped into the cooling pipe,
With
In the wastewater treatment tank, the waste water to be treated contained in the tank is heated and vaporized by the heating means, and the water content of the wastewater contained in the tank is reduced and concentrated.
Steam separated by vaporizing the waste water is collected and condensed by the separated water generating means to extract the separated water,
By adjusting the charging means and the discharging means so that the waste water has a predetermined concentration, the charging speed and the discharging speed are adjusted to a predetermined amount, and can be continuously processed. High load wastewater treatment system.

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