KR20200073089A - Jinseng processing organic wasted water treating apparatus - Google Patents

Abstract

The present invention provides an apparatus for treating ginseng processing organic wasted water, the apparatus including: a mechanical pre-treatment unit for pre-treating ginseng processing organic wasted water; an acid fermentation vessel for acid-fermenting wasted water that passed through the mechanical pre-treatment unit; a wet digestion vessel for generating methane gas and carbon dioxide by decomposing organic materials residing in the wasted water exiting from the acid fermentation vessel; a waste heat recovery vessel installed at a rear end of the wet digestion vessel to recover waste heat from the digestion wasted liquid and supply the recovered waste heat to the acid fermentation vessel; a solid/liquid separator installed at a rear end of the waste heat recovery vessel to receive ultra-fine bubbles of a normal pressure and ozone from an ultra-fine bubble supplier and an ozone generator; and a heat exchange unit for exchanging heat with the digestion wasted liquid of the waste heat recovery vessel to cool the wasted water introduced into the solid/liquid separator as the wasted water of the acid fermentation vessel exchanges heat with the wasted water. Accordingly, energy can be saved.

Description

Ginseng processing organic wastewater treatment system {JINSENG PROCESSING ORGANIC WASTED WATER TREATING APPARATUS}

The present invention relates to an apparatus for treating ginseng-processed organic wastewater, and more specifically, by treating ultrafine foam and ozone as a final post-treatment process of ginseng-processed organic wastewater, to save energy, improve microorganism survival rate, and reduce initial organic input concentration. In addition, it is possible to place the acid fermentation tank instead of the raw water storage tank to promote the spouting effect by concentrated sludge and waste heat recovery, and install a waste heat recovery tank at the rear end of the wet digestion tank to recover waste heat from the digested waste liquid and use it in the acid fermentation tank. The present invention relates to a ginseng processing organic wastewater treatment apparatus that provides optimization of biological wastewater treatment of gas detection or digestion waste liquid.

Ginseng processing wastewater is a high-concentration organic wastewater. It is difficult to directly enter the bioreactor and the load fluctuation is large, so that the impact load of the bioreactor microorganisms may occur. To solve this problem, reduce the load at the inlet stage and ensure stable treatment. Processing is required.

In addition, ginseng processing organic wastewater is mainly composed of moisture, suspended solids, and oil, and the oil is stably present in the water layer in an emulsion state, and the suspended solids are dispersed as fine particles. Difficult to separate.

1 is a conventional organic wastewater treatment process diagram, the main configuration is as follows. The raw water storage tank of the conventional configuration does not perform the functions of an acid fermentation tank and a solubilization tank, but performs a function of storing only 0.5 to 2 days, and the wet digestion tank must perform an acid fermentation tank function, so the energy efficiency of organic waste resources is 65 It shows low efficiency at ~70%. In addition, although the digestion waste liquid of medium temperature (35℃) is necessarily generated in the treatment and energy facility of organic wastewater, a recycling plan for this is not suggested.

According to the above configuration, the C/N ratio of the digestive waste liquid is about 10±1, and a large amount of methanol (carbon source) is currently being injected to meet the optimal C/N ratio 20 of microbial decomposition. This not only increases the pollutant load and reduces the efficiency of the subsequent wastewater treatment process, but also frequent claims in the associated treatment plant.

There is also a method of treating wastewater after dehydration and/or pressurization of existing digestive waste liquids, but many problems such as the need to use coagulants are essential, the efficiency of dehydration and solid-liquid separation is low, and the effect of nitrogen removal can hardly be provided. Have been.

The present invention has been devised to solve the problems of the prior art as described above, the purpose of which is the final post-treatment process of ginseng-processed organic wastewater by treating ultrafine foam and ozone, thereby saving energy, improving microbial survival and initial organic matter. It is possible to reduce the input concentration, and furthermore, an acid fermentation tank is placed instead of the raw water storage tank to promote the spouting effect by concentrated sludge and waste heat recovery. It is to provide a treatment device for ginseng processing organic wastewater to provide optimization of biological wastewater treatment of greenhouse gas detection or digestion waste liquid to be used in.

The technical problem of the present invention as described above is achieved by the following means.

(1) a mechanical pre-treatment unit for pre-processing ginseng-processed organic wastewater; An acid fermentation tank for acid fermenting the wastewater that has passed through the mechanical pretreatment section; A wet fire extinguishing tank that generates methane gas and carbon dioxide by decomposing organic substances remaining in the wastewater from the acid fermentation tank; And a waste heat recovery tank installed at a rear end of the wet fire extinguishing tank and recovering waste heat from digestion waste liquid and supplying it to the acid fermentation tank. A solid-liquid separator which is installed at a rear end of the waste heat recovery tank and receives solid pressure of ultra-fine cloth and ozone from an ultra-fine-strength cloth supplyer and an ozone generator to separate solid-liquid; It includes; And heat exchange unit for cooling the wastewater flowing into the solid-liquid separator as the heat exchange with the waste water of the acid fermentation tank heat exchange with the digestion waste liquid of the waste heat recovery tank;

The heat exchange unit,

A first heat exchange unit for transferring waste heat of the waste heat recovery tank to wastewater of the acid fermentation tank using a circulating refrigerant; And

It includes; a second heat exchange unit for circulating the wastewater of the acid fermentation tank to exchange heat with the digested waste liquid of the waste heat recovery tank;

The second heat exchange unit,

A second low temperature heat exchange tube provided in a zigzag manner inside the waste heat recovery tank;

A second refrigerant pipe for circulating the wastewater of the acid fermentation tank by connecting the outlet of the second low temperature heat exchange pipe and the inside of the acid fermentation tank and the inside of the acid fermentation tank and the inlet of the second low temperature heat exchange pipe, respectively; And

And a transfer pump provided in the second refrigerant pipe to transfer the wastewater of the acid fermentation tank to a second low temperature heat exchange pipe.

(2) In the above (1), the first heat exchange section,

A first high-temperature heat exchange tube provided in a zigzag manner inside the acid fermentation tank;

A first low temperature heat exchange tube provided in a zigzag manner inside the waste heat recovery tank;

A first refrigerant pipe for circulating the refrigerant by connecting the outlet of the first low temperature heat exchange pipe and the inlet of the first high temperature heat exchange pipe and the outlet of the first high temperature heat exchange pipe and the inlet of the first low temperature heat exchange pipe, respectively;

A first expansion valve for expanding the refrigerant that has passed through the first high temperature heat exchange pipe to low pressure; And

It includes; a first evaporation pipe for evaporating the refrigerant having passed through the first expansion valve to a low temperature;

After the refrigerant in a low temperature state is moved along the first low temperature heat exchange tube by the first evaporation tube, the heat exchanger exchanges with the digested waste liquid of the waste heat recovery tank, and then moves to the first high temperature heat exchange tube to exchange heat with the wastewater of the acid fermentation tank. , Ginseng processing organic wastewater treatment apparatus characterized by repeating this.

According to the present invention as described above, it is possible to reduce energy, improve microbial survival rate and reduce initial organic input concentration by treating ultrafine foam and ozone as a final post-treatment process of ginseng processed organic wastewater, and furthermore, acid fermentation tank instead of raw water storage tank. It promotes the sporadic effect by concentrated sludge and waste heat recovery, and installs a waste heat recovery tank at the rear end of the wet fire extinguishing tank to recover waste heat from the digested waste liquid and use it in the acid fermentation tank to detect greenhouse gases or treat biological wastewater from digested waste liquid. Provides the effect of providing optimization.

1 is a block diagram of a conventional organic wastewater treatment device,
2 is a block diagram of a ginseng processing organic wastewater treatment apparatus according to the present invention,
3 is a block diagram of a heat exchanger according to the present invention,
4 is a block diagram of a solid-liquid separator according to the present invention.

The processing device for ginseng processing organic wastewater according to the present invention includes an acid fermentation tank 100, a wet digestion tank 200, a waste heat recovery tank 300, a solid-liquid separator 400, and a heat exchanger 500.

Among the device configurations according to the present invention described below, the wet fire extinguishing tank 200 may adopt device configurations or treatment conditions that are adopted in a conventional organic wastewater treatment device, and can be performed in embodiments of the present invention described below. Among them, it will be described as a preferred example, and therefore it is natural that the scope of the present invention is not limitedly interpreted to these conditions.

Hereinafter, the contents of the present invention will be described in more detail with reference to an embodiment as shown in FIG. 2.

In the present invention, the mechanical pre-treatment unit 10 of the front end may be a pulverizer or a floating separation tank that removes scum in the waste liquid by receiving organic wastewater processed with ginseng. In this way, the mechanical pre-treatment unit 10 can increase the digestion efficiency at the rear end by removing contaminants, organic solids, or scum.

When the mechanical pre-treatment unit 10 is a floating separation tank, a scraper (not shown) for removing the scum is installed on an oblong rectangular cylinder to discharge the scum to the rear end of the floating separation tank. Preferably, the high pressure air (preferably 3 kg/cm 2 or more) is injected into the floating separation tank 10 using an air compressor to increase the floating efficiency. Also, the linear speed of the scraper is preferably 1 to 3 m/min.

In the present invention, the treated water discharged from the mechanical pretreatment unit 10 is transferred to the acid fermentation tank 100 for decomposition of organic matter instead of a separate raw water storage tank.

The acid fermentation tank 100 is installed at the rear end of the mechanical pre-treatment unit 10, receives the liquid treated water discharged from the mechanical pre-treatment unit 10, acid-ferments the organic matter, and treats the water with the wet digestion tank 200 at the rear stage. Drain. In the acid fermentation tank 100, carbohydrates such as cellulose and starch in organic matter are decomposed into sugars having a simpler structure, proteins are decomposed into amino acids, and fat is hydrolyzed into glycerol or fatty acids. This action is made by acid fermentation bacteria, the acid fermentation bacteria are activated at 30 ~ 35 ℃, pH 5.5 ~ 6.5, so the temperature and pH of the acid fermentation tank 100 is adjusted to the above level.

As described above, the acid fermentation tank 100 increases the efficiency of the wet digestion tank 200 by decomposing organic substances in ginseng processing organic wastewater, and uses carbon dioxide and hydrogen gas generated by acid fermentation to have relatively low specific gravity, so it is easy to float. It plays a role of separating floating solids and oils to some extent.

In addition, the present invention is preferably by supplying microbubbles to the acid fermentation tank 100 to remove suspended solids and oils at a high speed throughout the treated water to remove them quickly and efficiently. Therefore, in this case, a separate stirrer is not required.

According to the present invention, the waste heat recovered by the waste heat recovery tank 300 in the rear stage is used as the heat source required for the acid fermentation tank 100, and by maintaining the optimum temperature of 30 to 35°C, the waste heat recovery is performed. The acid fermentation reaction is further promoted.

The rear stage wet digestion tank 200 is a conventional anaerobic digestion tank, and decomposes organic substances remaining in the liquid wastewater to generate methane gas and carbon dioxide. Since it is sufficient to use the existing conventional apparatus or conditions, detailed description thereof will be omitted.

The wastewater digested through the wet digestion tank 200 is transferred to a conventional digestion waste storage tank, but in the present invention, it is transferred to the waste heat recovery tank 300.

The waste heat recovery tank 300 includes a heat exchanger or a heat pump, and recovers digested waste liquid at 35°C to 20°C.

In one embodiment, as shown in Figure 3, the heat exchange unit 500 is provided to recover the waste heat of the waste heat recovery tank 300.

The heat exchange unit 500 is heat-exchanged with the digested waste liquid of the waste heat recovery tank 300 to cool the wastewater flowing into the solid-liquid separator 400 as it exchanges heat with the wastewater of the acid fermentation tank 100.

The heat exchange part 500 is composed of a first heat exchange part 510 and a second heat exchange part 520.

The first heat exchange unit 510 is provided to transfer the waste heat of the waste heat recovery tank 300 to the wastewater of the acid fermentation tank 100 using a circulating refrigerant.

In addition, the second heat exchange unit 520 is provided to circulate the wastewater of the acid fermentation tank 100 to exchange heat with the digested waste liquid of the waste heat recovery tank 300.

First, the first heat exchange unit 510 includes a first high temperature heat exchange pipe 511, a first low temperature heat exchange pipe 512, a first refrigerant pipe 513, a first expansion valve 514, and a first evaporation pipe 515 ).

The first high temperature heat exchange pipe 511 is provided in a zigzag manner inside the acid fermentation tank 100, and the first low temperature heat exchange pipe 512 is provided in a zigzag manner inside the waste heat recovery tank 300.

And the first refrigerant pipe 513 is the outlet of the first low temperature heat exchange pipe 512 and the inlet of the first high temperature heat exchange pipe 511 and the outlet of the first high temperature heat exchange pipe 511 and the first low temperature heat exchange pipe 512 It is provided to circulate the refrigerant by connecting the inlets of each.

The first expansion valve 514 is provided to expand the refrigerant that has passed through the first high temperature heat exchange tube 511 to a low pressure.

In addition, the first evaporation pipe 515 is provided to evaporate the refrigerant that has passed through the first expansion valve 514 at a low temperature.

The first expansion valve 514 and the first evaporation pipe 515 are provided in the first refrigerant pipe 513 connecting the outlet of the first high temperature heat exchange pipe 511 and the inlet of the first low temperature heat exchange pipe 512. It is natural that the low temperature of the refrigerant is adjusted to a temperature at which the waste heat recovery tank 300 can recover the digested waste liquid up to 20°C.

Looking at the operating state of the first heat exchange unit 510, the refrigerant in the low temperature state by the first evaporation pipe 515 moves along the first low temperature heat exchange pipe 512 and the digested waste liquid of the waste heat recovery tank 300. After heat exchange, it is moved to the first high-temperature heat exchange pipe 511 to exchange heat with the wastewater of the acid fermentation tank 100, and by repeating this, the digested waste liquid of the waste heat recovery tank 300 is maintained at 20°C.

In addition, the second heat exchange unit 520 is composed of a second low temperature heat exchange tube 521, a second refrigerant tube 512, and a transfer pump 513.

The second low temperature heat exchange pipe 521 is provided in a zigzag manner inside the waste heat recovery tank 300.

In addition, the second refrigerant pipe 512 connects the outlet of the second low temperature heat exchange pipe 521 and the inside of the acid fermentation tank 100 and the inside of the acid fermentation tank 100 and the inlet of the second low temperature heat exchange pipe 521, respectively. It is provided to circulate the wastewater of the acid fermentation tank 100.

The transfer pump 513 is provided in the second refrigerant pipe 512 to transfer the wastewater of the acid fermentation tank 100 to the second low temperature heat exchange pipe 521.

Of course, the first heat exchange unit 510 and the second heat exchange unit 520 are each provided with a temperature sensor for measuring the temperature and a control unit for controlling the valve by receiving the signals of the valve and the temperature sensor, respectively. It is natural to circulate the refrigerant and wastewater only when the temperature of the digested wastewater of) can be maintained at 20°C.

Thereafter, the digested waste liquid at 20°C is transferred to the solid-liquid separator 400 at the rear end. The solid-liquid separator 400, as shown in Figure 4, includes an ultra-fine-strength cloth (30 ~ 75㎛) of the atmospheric pressure at the bottom and the ultra-fine-strength cloth inlet 410 is supplied with ozone.

The ultra-fine-strength fabric inlet 410 is a portion that receives ultra-fine-strength fabric and ozone from the ultra-fine fabric supply unit 420 and inputs it into the waste liquid therein. For this purpose, the end may take the form of a dispersion nozzle or a diffuser.

As described above, the ultra-fine-strength cloth introduced therein is introduced into the treated water to perform a function of uniformly stirring the entire waste liquid, and also enables the solid-liquid separation by rapidly floating the remaining suspended solids or oil contained in the waste liquid upwards.

In the present invention, air may be used as the ultra-fine-strength cloth supply unit 420, but preferably, carbon dioxide and hydrogen gas generated by the acid fermentation tank 100 may be used. That is, carbon dioxide and hydrogen gas generated by the acid fermentation tank 100 are not discharged into the air, but are collected by a separate collection unit (not shown) and recycled as gas to be input to the ultra-fine-strength fabric supply unit 420.

The ultra-fine foam supply 420 may be configured only with a conventional air compressor (or compressor) as shown in FIG. 4, or the ultra-fine foam supply 420 may be installed inside or outside a waste liquid pump (not shown) And the air compressor (not shown), wherein the waste liquid supplied by the waste liquid pump and the gas supplied by the air compressor are collided in a mixing chamber (not shown) to provide a waste liquid containing ultrafine foam. This also constitutes an embodiment of the present invention.

In the former case, it is not particularly limited, but preferably, high-pressure air of 1 to 3 kg/cm 2 may be used, and in the latter case, the ultra-fine-strength air supply 420 may include a treated water pump, an air compressor, a mixing chamber, and the above. It may be implemented by including a supply pump for supplying the waste liquid containing the ultra-fine-strength cloth generated in the mixing chamber to the ultra-fine-strength inlet 410. In this case, the pressure of the supply pump is preferably 3 to 5 kg/cm2.

In addition, the ultra-fine feeder 420 is supplied with ozone from the ozone generator 430. It is possible to reduce the initial concentration of organic input due to the supply of ozone. Therefore, it is possible to reduce the impact load on the microorganism by significantly reducing the load of the organic material upon the introduction into the subsequent bioreactor.

The ultra-fine-strength fabric supply unit 420 according to the present invention may be operated at all times or intermittently whenever necessary.

The waste solution treated according to the above configuration is separated into a solid-liquid of approximately 65% or more, as well as exhibits an efficiency of removing nitrogen of 40% or more (ammonia nitrogen has a very high degassing efficiency). Further, the C/N ratio is increased from about 10 to 16 to 20 according to the prior art. Through this, not only the existing methanol input process can be omitted, but also the temperature of the biological wastewater treatment of the digested waste liquid is maintained at 20~25℃, which is the optimum temperature of the biological wastewater treatment process after the previous waste heat recovery tank 300. The efficiency is greatly increased.

The separating liquid (Q _P ) is transferred to a wastewater treatment process in the rear stage, a portion of the concentrated sludge (Q _R ) that is floating and separated is returned to the acid fermentation tank 100, and a portion (Q _S ) is transferred to a subsequent waste treatment process. . As such, a portion of the concentrated sludge (Q _R ) is returned to the acid fermentation tank 100, and thus not only can reduce the waste sludge by 30% or more, but also provides an effect of promoting the acid fermentation reaction in the acid fermentation tank 100.

In describing the device of the present invention as described above, pumps or valves may be installed as many as necessary at the required locations for the transfer of treated water between devices, and such a configuration is obvious in the art, and detailed descriptions have been omitted.

When using the system according to the present invention as described above, it is possible to quickly and completely remove the oil or solids present in the treated water, so that the organic matter present in the treated water can be completely removed by anaerobic fermentation.

Hereinafter, the present invention will be described in more detail with the following examples. However, this is for easier understanding of the present invention, and is not intended to limit the present invention through them.

[Example]

As a result of treating the organic wastewater processed with ginseng using the system shown in FIG. 2, it is shown that the organic wastewater finally discharged can be treated very effectively (Table 1).

Treatment result pH TS
(mg/L) CODcr
(mg/L) TN
(NH3-N)
(mg/L) C/N ratio
(-) TP
(mg/L) Total pollution
Load (%) Before the ultra-century
(High concentration fire extinguishing liquid) 7.83 15.330 32,120 2,830
(2,740) 20 (waste water)
10 (digestive liquid) 312 100% After the ultra-century
(After 40 minutes reaction) 7.68 5,100 29,680 1,450
(1,320) 20
(Appropriate C/N ratio) 165 48.6% Pollution load reduction rate
(%) - 66.73% 7.59% 48.76%
(51.82%) Upgrade to 20 47.12% 51.4%
Reduction rate

As described above, although described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can understand that you can.

10: mechanical pretreatment
100: acid fermentation tank
200: wet fire extinguishing tank
300: waste heat recovery tank
400: solid-liquid separator
500: heat exchanger

Claims (2)

A mechanical pre-treatment unit for pre-processing ginseng processed organic wastewater; An acid fermentation tank for acid fermenting the wastewater that has passed through the mechanical pretreatment section; A wet fire extinguishing tank that produces methane gas and carbon dioxide by decomposing organic substances remaining in the wastewater from the acid fermentation tank; And a waste heat recovery tank installed at the rear end of the wet fire extinguishing tank and recovering waste heat from the digested waste liquid and supplying it to the acid fermentation tank. A solid-liquid separator which is installed at the rear end of the waste heat recovery tank and receives solid pressure of ultra-fine cloth and ozone from the ultra-fine-strength cloth supply and ozone generator to separate solid-liquid; It includes; and a heat exchange unit for cooling the wastewater flowing into the solid-liquid separator by heat exchange with the wastewater of the acid fermentation tank in heat exchange with the digestion waste liquid of the waste heat recovery tank;
The heat exchange unit,
A first heat exchange unit for transferring waste heat of the waste heat recovery tank to wastewater of the acid fermentation tank using a circulating refrigerant; And
It includes; a second heat exchange unit for circulating the wastewater of the acid fermentation tank for heat exchange with the digested waste liquid of the waste heat recovery tank
The second heat exchange unit,
A second low temperature heat exchange tube provided in a zigzag manner inside the waste heat recovery tank;
A second refrigerant pipe for circulating the wastewater of the acid fermentation tank by connecting the outlet of the second low temperature heat exchange pipe and the inside of the acid fermentation tank and the inside of the acid fermentation tank and the inlet of the second low temperature heat exchange pipe, respectively; And
And a transfer pump provided in the second refrigerant pipe to transfer the wastewater of the acid fermentation tank to a second low temperature heat exchange pipe. The method of claim 1, wherein the first heat exchange unit,
A first high-temperature heat exchange tube provided in a zigzag manner inside the acid fermentation tank;
A first low temperature heat exchange tube provided in a zigzag manner inside the waste heat recovery tank;
A first refrigerant pipe for circulating the refrigerant by connecting the outlet of the first low temperature heat exchange pipe and the inlet of the first high temperature heat exchange pipe and the outlet of the first high temperature heat exchange pipe and the inlet of the first low temperature heat exchange pipe, respectively;
A first expansion valve for expanding the refrigerant that has passed through the first high temperature heat exchange pipe to low pressure; And
It includes; a first evaporation pipe for evaporating the refrigerant having passed through the first expansion valve to a low temperature;
After the refrigerant in a low temperature state is moved along the first low temperature heat exchange tube by the first evaporation tube, it is exchanged with the digested waste liquid of the waste heat recovery tank, and then moved to the first high temperature heat exchange tube to exchange heat with the wastewater of the acid fermentation tank. , Ginseng processing organic wastewater treatment apparatus characterized by repeating this.

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