KR20110091047A - Livestock wastewater treatment apparatus and treatment method - Google Patents

Abstract

PURPOSE: A livestock wastewater processing apparatus and a method for the same are provided to suppress the supplement of additional water by recycling processing water without solid materials as diluting water. CONSTITUTION: A receiving tank(1) collects raw livestock wastewater. A controlling tank(2) dilutes the raw livestock wastewater with diluting water. A coagulation floating tank(3) slowly stirring the diluted wastewater and floats floating materials based on a coagulating agent and oxygen aeration. Wastewater in a solid-liquid state is obtained. A solid material is separated from the wastewater to obtain separated liquid in a dehydrator(4). An alkalization tank(5) forms alkaline wastewater by contacting the separated liquid with sodium hydroxide. An oxidization tank(6) forms acidic wastewater by contacting the alkaline wastewater with peroxide and sulfuric acid. A neutralization tank(7) neutralizes the acidic wastewater by contacting the acidic wastewater with the sodium hydroxide.

Description

Livestock wastewater treatment apparatus and treatment method

The present invention relates to a livestock wastewater treatment apparatus and treatment method, and more specifically, it is possible to improve the treatment efficiency and treatment level of nitrogen, phosphorus, etc. of livestock wastewater by using an advanced oxidation method (AOP) using oxygen, ozone, hydrogen peroxide water. The present invention relates to an apparatus and a method.

In general, livestock wastewater and livestock manure account for 70% of the causes of water pollution and are difficult to purify. Therefore, development of high efficiency and advanced treatment technology is urgently needed to overcome the lack of water.

Conventionally, the standard activated sludge method has been widely used for organic wastewater treatment such as livestock wastewater. It homogenizes and dilutes the liquid phase in the reservoir, activates the activity of aerobic bacteria in the aeration tank, and naturally precipitates it in the precipitation tank. Here, the supernatant (top clear liquid) was sterilized and discharged, and the precipitate was concentrated and dehydrated and discarded.

However, this requires a large amount of dilution water, there was a problem that the aeration tank or sedimentation tank should be large in order to treat the diluted wastewater.

On the other hand, to compensate for the shortcomings of the standard activated sludge method, Patent Publication No. 10-1997-0059118, after removing the contaminants and sand, homogenizes the liquid phase in the storage tank, the first aeration with a micro-bubble, aeration in the bioreactor to aerobic bacteria It discloses a technique for activating the activity of the air, the second aeration with microbubbles, the ozone contact with the microbubbles and the third aeration in the ozone contact tank, and discharge. The sludge storage tank, the coagulation tank, and the second dehydrator are arranged to process the first dehydrator and the sludge produced by the second aeration and the third aeration for the treatment of the suspended matter by the first aeration.

However, in the above configuration, four bubble generators are required, and two dehydrators are required, so that the apparatus is enlarged, the energy required for bubble generation or dehydration is increased, and various treatment apparatuses are treated as they are without diluting the wastewater stock solution. There is a problem in that the load of is increased and bubbles are not smoothly adhered to the suspended matter during aeration.

Patent Publication No. 10-1997-0059118

The present invention is to solve the problems of the prior art, by diluting the livestock wastewater solution to prevent the increase of load of the treatment equipment, it is possible to smoothly bubbles attached to the float during aeration, the treated water from which the solid content is removed It is an object of the present invention to provide a livestock wastewater treatment apparatus and method capable of suppressing replenishment of new water by rehabilitation with dilution water.

Another object of the present invention is to provide a livestock wastewater treatment apparatus and method that can prevent device oversizing due to overlapping of devices having the same function and reduce energy consumption.

In order to solve the above problems, the apparatus of the present invention, a storage tank for collecting the livestock wastewater solution, a control tank for diluting the livestock wastewater solution with dilution water to make a dilution wastewater, while stirring the dilution wastewater slowly, by flocculant and oxygen aeration Flocculation flotation tank which floats floating material to make solid liquid waste water, dehydrator which separates and removes solid content from the solid waste water to make separation liquid, alkalizing tank which makes alkaline waste water by making strong alkaline by contact with sodium hydroxide, the alkaline waste water Oxidation tank which rapidly oxidizes by contact with ozone, hydrogen peroxide water and sulfuric acid to make acid waste water, neutralization tank which neutralizes the acid waste water by contact with sodium hydroxide to make neutral waste water, and filter the neutral waste water by filtration Sand filter to make a suction, the remaining components of the filtered water Activated charcoal filter to make the final treated water, the final treated water is collected, and part of the dilution water at least one part of the discharge water tank discharged, the separation liquid from the dehydrator or the final treated water from the discharge tank Or it is characterized in that it comprises a replenishment pipe to be incorporated into the control tank as a replacement water for all.

Here, the livestock wastewater solution flow sensor for measuring the flow rate of the livestock wastewater solution flowing into the control tank, the dilution water flow sensor for measuring the flow rate of the dilution water flows into the control tank, measuring the flow rate of the replenishment water flowing into the control tank Replenishment water flow sensor, dilution water valve for adjusting the flow rate of dilution water flowing into the control tank, replenishment water valve for adjusting the flow rate of replenishment water flowing into the control tank, the livestock wastewater solution flow sensor, dilution water flow sensor and replenishment At least one of the dilution water valve and the replenishment water valve may be input to receive the detected values from the water flow sensor so as to maintain a predetermined dilution ratio of the dilution water and the replenishment water to the flow rate of the livestock wastewater solution. You may be provided with the control means to adjust.

In addition, the method of the present invention, dilution of the livestock wastewater solution with dilution water to make a dilution wastewater, while slowly stirring the dilution wastewater, the floating step to float the suspended solids by flocculant and oxygen aeration to make a solid wastewater, the solid solution A dehydration step of separating solids from the wastewater to form a separation liquid, an alkalizing step of strongly alkalineating the separation liquid by contact with sodium hydroxide to form an alkaline wastewater, and rapidly oxidizing the alkaline wastewater, followed by a strong oxidation with hydrogen peroxide solution and sulfuric acid contacting An oxidation step of producing an acidic wastewater, a neutralization step of neutralizing the acidic wastewater by contact with sodium hydroxide, a neutralization step of producing a neutral wastewater, a sand filter step of filtering the neutral wastewater to form filtered water, and adsorbing the remaining components of the filtered water. Activated Carbon Making Final Treatment Water By Ozone Water Contact A discharge step of collecting the final treated water and discharging a portion of the final treated water, and supplementing water replacing at least one part of the dilution water with at least one of the separation liquid from the dehydrator and the final treated water from the discharge tank. It is characterized in that it comprises a replenishment step to be incorporated into the control tank.

Here, the measuring step of measuring the flow rate of the livestock wastewater solution, the dilution water and the flow rate of the replenishment water flowing into the control tank, respectively, the calculation of calculating the ratio of the total flow rate of dilution water and the replenishment water to the flow rate of the livestock wastewater solution Step, a control step of adjusting at least one of the flow rate of the dilution water flowing into the control tank and the flow rate of the replenishment water to maintain the predetermined dilution ratio of the calculated flow rate.

According to the present invention, an increase in load of the treatment equipment is prevented by diluting and treating the livestock wastewater solution.

In addition, the diluted livestock wastewater is not concentrated in concentration, it is possible to smoothly adhere to the bubbles during aeration.

In addition, although dilution water is required for dilution, replenishment of the treated water from which solid content has been removed with dilution water can suppress replenishment of new water.

In addition, it is possible to prevent device enlargement due to overlapping of devices having the same function.

In addition, processing equipment can be reduced to reduce energy consumption.

1 is a system configuration of the livestock wastewater treatment apparatus of the present invention.
2 is a view showing a sensor and a valve for adjusting the dilution ratio of the livestock wastewater solution in the control tank.
3 is a comparative photograph of the livestock wastewater solution, the separation solution after flocculation tank and dehydrator, and the final treated water.
Figure 4 is a test report tested in a specialized laboratory for livestock wastewater solution of a livestock farm in Gimhae-si.
5 is a test report tested in the laboratory for the treatment liquid treated by applying the present invention to the livestock wastewater solution.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in more detail. However, elements having the same structure and the same function may be omitted by giving the same reference numerals.

1 is a system configuration of the livestock wastewater treatment apparatus of the present invention.

The apparatus of the present invention includes a storage tank (1) , an adjusting tank (2) , an flocculation flotation tank (3) , a dehydrator (4) , an alkalizing tank (5) , an oxidation tank (6) , a neutralization tank (7) , and a sand filter ( 8) , activated carbon filter (9) , discharge water tank (10) , and supplementary piping . These are one functional unit of processing for each component.

The storage tank 1 is a place for collecting livestock wastewater from livestock manure such as cattle and pigs.

The control tank (2) is a place for diluting the livestock wastewater solution with dilution water to make dilution wastewater. The dilution water refers to clear water (fresh water) such as tap water, river water, and spring water, and flows into the apparatus of the present invention from the outside. A control step of adjusting the dilution degree of the livestock wastewater solution by the control tank is performed.

The rate of dilution can depend on the stickiness and concentration of the livestock wastewater, the flotation capacity of the flocculation flotation at the end, and the dewatering capacity of the dehydrator. For example, in the case of a livestock wastewater solution that has a sticky mucus mixed with manure and urine, such as pig manure, much dilution is required as compared with the case where solid and liquid are almost separated, such as small manure.

However, the higher the dilution ratio, that is, the mixed amount of clear water, the larger the capacity of the next process and the proportion of chemicals used should be proportionately increased. Therefore, the processing cost is high.

In the present invention, even in the case of pig manure, only diluted 1 to 2 times, preferably 1 to 1.5 times the dilution water with respect to the livestock wastewater solution. If the amount of dilution water for the livestock wastewater is less than 1 times, the dilution effect is almost insignificant, and the processing efficiency of the next stage is reduced. Since the amount of clear water used for dilution is excessively large, the total volume becomes large, increasing the capacity of the facility and the amount of chemicals used more than necessary, thereby reducing economic efficiency. Therefore, the present invention consumes only a very small amount of dilution water compared to the conventional standard activated sludge method.

The flocculation flotation tank 3 is a place where floating liquid is floated by flocculating agent and oxygen aeration while slowly stirring the dilution wastewater to make solid liquid wastewater. This serves to float the solids mixed in the dilute wastewater by the oxidation of the flocculant to float it, and then transfer the solid wastewater of the upper layer containing the floated float to the dehydrator of the next stage. The flocculation injury reduces the BOD. Examples of the flocculant include FeCl ₃ . A flotation step of flocculating flotation of solids by flocculation flotation is performed.

Conventionally, there was a case of 'air' aeration, not oxygen aeration, but the limit of DO was 30. In the present invention, DO was raised to 130 or more by oxygen aeration.

The dehydrator (4) is a device that separates and removes solids from the solid wastewater to form a separation liquid. This reduces the BOD and eliminates SS and TP. At this time, the separated solids (cake) can be recycled by composting or fuelizing. Or incinerated. A dehydration step is performed to produce a separation liquid from which solids are removed by a dehydrator.

As a type of dehydrator, a centrifugal dehydrator may be used and a fiber filter may be used. Particularly in the case of pig manure, centrifugal dehydrator is advantageous because manure and urine are mixed to have a sticky liquid. In the case of bovine manure, manure and urine are naturally separated, so manure may be collected before composting into the reservoir, composted, or used as incineration or fuel after drying. In this case, since only a small portion of cows need to be treated with urine, using a gravity fiber filter does not significantly affect the efficiency.

The alkalizing tank 5 is a place where the alkaline solution is strongly alkalined by contact with sodium hydroxide to produce alkaline wastewater. For example, all alkaline weak bacteria are killed by strong alkaline at pH 10 to 10.5. An alkalizing step is performed to produce alkaline wastewater by an alkalizing tank.

The oxidation tank 6 is a place where the alkaline wastewater is rapidly stirred (preferably 180 rpm or more) and strongly oxidized by contact with ozone, hydrogen peroxide water and sulfuric acid to produce acidic wastewater. For example, all of the bacteria that are weak to acidity are killed by strong oxidation at pH 3-4. COD, TN (nitrogen) and ammonia are removed from the oxidizer. An oxidation step is carried out by the oxidizing tank to produce an acidic wastewater.

In the conventional so-called phantom method, only sulfuric acid is added for oxidation, but sulfuric acid alone is difficult to oxidize. In terms of the oxidizing power, since F> O ₃ > H ₂ O ₂ > O ₂ , oxidation by ozone is very important.

Ozone, preferably ozone dissolved water should be administered at least 3 for sterilization, at least 5 for colorlessness by color removal of dyed wastewater, and serves to remove COD below 50, preferably below 20.

The neutralization tank 7 is a place where the acidic wastewater is neutralized to pH 7 by contact with sodium hydroxide to produce neutral wastewater. A neutralization step is carried out by the neutralization tank to produce neutral wastewater.

The sand filter (8: Sand Filter, SF) is a filter for filtering the neutral wastewater to produce filtered water. It is preferable that washing is possible by backwashing. A sand filter step for producing filtered water by a sand filter is performed.

The activated carbon filter (9: Granule Active Carbon, GAC) is a filter which adsorbs the remaining components of the filtered water to produce the final treated water. Passing this reduces COD. The activated carbon filter step of producing the final treated water by the activated carbon filter is performed.

The discharge water tank 10 is a water tank that collects the final treated water, and partly discharges it to agricultural water or the like for reuse. The discharge step of collecting and discharging the final treated water by the discharge tank is performed.

The replenishment pipe is a pipe to which the replenishment water of FIG. 2 is supplied and replaces at least one of the separation liquid from the dehydrator and the final treated water from the discharge tank as a replenishment water to replace a part or all of the dilution water. Piping to mix into the adjustment tank. The required amount of dilution water is reduced by the amount of the replenishment water. A replenishment step is performed in which a portion of the treated water is returned to the dilute replenishment liquid.

In this way, since part of the intermediate treated water or the final treated water can be returned and reused as dilution water, the required amount of dilution water, which is clear water supplied from the outside, can be significantly reduced.

2 is a view showing a sensor and a valve for adjusting the dilution ratio of the livestock wastewater solution in the control tank.

When a part of the treated water from which the solid content has been removed is incorporated into the dilution water as replenishing water, a configuration capable of automatically controlling the dilution ratio in the adjusting tank 2 is necessary.

Such an arrangement, the livestock wastewater stock solution flow rate sensor (S0), dilution water flow rate sensor (S1), make-up water flow sensor (S2), diluted with water valves (V1), make-up water valve (V2), control means (not shown) It may be provided.

The livestock wastewater stock solution flow sensor S0 is a sensor for measuring the flow rate of the livestock wastewater stock solution flowing into the adjustment tank 2.

The dilution water flow rate sensor (S1) is a sensor for measuring the flow rate of the dilution water flowing into the control tank (2).

The replenishment water flow sensor S2 is a sensor for measuring the flow rate of the replenishment water flowing into the adjustment tank 2. It is preferable to be installed in the supplementary pipe.

The dilution water valve V1 is a valve for adjusting the flow rate of the dilution water flowing into the control tank 2.

The make-up water valve V2 is a valve for adjusting the flow rate of the make-up water flowing into the adjustment tank 2. It is preferable to be installed in the supplementary pipe.

The control means receives the detected values from the livestock wastewater stock flow sensor S0, the dilution water flow sensor S1, and the replenishment water flow sensor S2, respectively, to determine the dilution water and the replenishment water for the flow rate of the livestock wastewater stock solution. It is a means for adjusting the opening degree of at least one of the said dilution water valve V1 and the replenishment water valve V2 so that a total flow volume may maintain a predetermined dilution ratio.

A measurement step of measuring the flow rate of the livestock wastewater stock solution, the dilution water flow rate, and the replenishment water flow rate respectively flowing into the control tank, and calculating a ratio of the total flow rate of the dilution water and the replenishment water to the flow rate of the livestock wastewater solution; A control step of adjusting at least one of the flow rate of the dilution water flowing into the control tank and the flow rate of the replenishment water may be provided so as to maintain the predetermined dilution ratio.

For example, if the inflow rate of the livestock wastewater solution to the control tank 2 is increased or decreased by adjusting the livestock wastewater solution valve V0, this is sensed by the livestock wastewater solution flow sensor S0, and the control means is connected to the dilution water. What is necessary is just to calculate the total flow volume of a make-up water, calculate the ratio of this total flow volume and the flow volume of a livestock wastewater liquid, and to increase or decrease the flow volume of at least any one of the said dilution water and make-up water.

At this time, both the dilution water and the replenishment water are clear water, and since they are used to dilute the livestock wastewater solution, they are replaced with each other. However, dilution water, which is clear water introduced from the outside, is supplied only at the beginning, and after the flow rate of intermediate treated water or final treated water is enriched, the device is operated only by supplemental water, thereby saving the cost of diluting water, which is expensive clear water. We can plan.

<Test Results>

3 is a comparative photograph of the livestock wastewater solution, the separation solution after flocculation tank and dehydrator, and the final treated water. Figure 4 is a test report tested in a specialized laboratory for livestock wastewater solution of a livestock farm in Gimhae-si. 5 is a test report tested in the laboratory for the treatment liquid treated by applying the present invention to the livestock wastewater solution.

As shown in Fig. 3, the livestock wastewater solution was almost black, but when applying the technique of the present invention, it was found that the separation solution through the flocculation tank and the dehydrator became a clear tan and the final treated water was almost transparent. Can be.

The test report of FIG. 4 is a test of livestock wastewater solution of a livestock farm in Gimhae-si, and FIG. 5 is a test of the final treated water treated with the livestock wastewater solution according to the present invention. In comparison with the national standard for water quality (there is no standard for salinity).

BOD
(mg / L) COD
(mg / L) TN
(mg / L) TP
(mg / L) Total coliform count
(Number / ml) SS
(mg / L) salt Domestic water quality standards 30-10 40-40 60-20 8 ~ 2 3,000 30-10 - Livestock Wastewater 139.5 264.0 764.675 7.890 820.0 - 3.84 Dehydrator Separation Solution 36.2 20.7 29.115 0.268 Not detected - - Final treatment 1.3 5.4 36.323 0.057 Not detected 4.0 35.06

Here, the livestock wastewater collected in the storage tank 1, it can be seen that all items except the T-P and total coliform count exceeds the domestic water quality standards.

The livestock wastewater solution is diluted with 1 to 2 times the amount of clear water in the control tank 2, the flocculation tank 3 is coagulated by flocculant and oxygen aeration, and the solids are removed from the dehydrator 4. As for the separated liquid produced, it can be seen that all items except BOD meet the domestic water quality standards. Therefore, this separation liquid may be used for dilution by returning to the said adjustment tank 2 as supplementary water.

And it turns out that all the final treated water falls in the domestic standard value range. In particular, compared to the maximum value of the baseline, BOD is about 1/30, COD is about 1/8, TN is about 1/2, TP is about 1/160, total coliform population is 0, and SS is about 1/8. In other words, it is almost clear water.

Therefore, it can be seen that the treatment efficiency and treatment level of the present invention are excellent.

As mentioned above, although this invention was demonstrated based on the specific Example, this invention is not limited to this, All the deformation | transformation, improvement, and a change made within the range of a claim should be interpreted as belonging to this invention.

The present invention can be used in the industrial field to clean and recycle livestock waste water.

1: storage tank 2: adjusting tank
3: flocculation flotation 4: dehydrator
5: alkalizing tank 6: oxidation tank
7: neutralization tank 8: sand filter
9: activated carbon filter 10: discharge tank

Claims (4)

Reservoir tank to collect livestock waste liquor
A control tank for diluting the livestock wastewater solution with dilution water to make dilution wastewater;
Aggregate flotation , which stirs the suspended solids while slowly floating the suspended solids by flocculating agent and oxygen aeration,
Dehydrator for separating and removing the solid content from the solid waste water,
An alkalizing tank for producing an alkaline wastewater by strongly alkalizing the separated solution by contact with sodium hydroxide,
Oxidation tank for rapidly acidifying the alkaline wastewater and producing an acidic wastewater by strongly oxidizing by contact with ozone, hydrogen peroxide water and sulfuric acid,
Neutralization tank to neutralize the acidic wastewater by contact with sodium hydroxide to create a neutral wastewater,
A sand filter for filtering the neutral wastewater to produce filtered water;
Activated carbon filter for adsorbing the remaining components of the filtered water to form the final treated water,
A discharge tank for collecting the final treated water , part of which is discharged,
Supplementary piping for incorporating a portion of at least one of the separation solution from the dehydrator or the final treated water from the discharge tank into the control tank as a replacement water for a part or all of the dilution water.
Livestock wastewater treatment apparatus comprising: a. The method according to claim 1,
Livestock wastewater stock solution flow sensor for measuring the flow rate of the livestock wastewater stock flowing into the control tank;
Dilution water flow rate sensor for measuring the flow rate of dilution water flowing into the control tank,
Replenishment water flow rate sensor for measuring the flow rate of the replenishment water flowing into the control tank,
Dilution water valve for adjusting the flow rate of dilution water flowing into the control tank,
Replenishment water valve for adjusting the flow rate of the replenishment water flowing into the control tank,
The dilution is performed by receiving detection values from the livestock wastewater stock sensor, the dilution water flow sensor, and the replenishment water flow sensor, respectively, to maintain a predetermined dilution ratio of the dilution water and the replenishment water to the flow rate of the livestock wastewater stock solution. Control means for adjusting the opening degree of at least one of the water valve and the make-up water valve
Livestock wastewater treatment apparatus comprising: a. Control step of diluting livestock wastewater with dilution water to make dilution wastewater
Slowly stirring the dilution waste water, the floating step to float the flotation by flocculant and oxygen aeration to create a high liquid waste water,
Dehydration step of separating the solids from the solid wastewater to form a separation liquid,
An alkalizing step of producing an alkaline wastewater by strongly alkalizing the separated solution by contact with sodium hydroxide,
Oxidation step of rapidly stirring the alkaline wastewater, making the acidic wastewater by strongly oxidizing by contact with hydrogen peroxide and sulfuric acid,
Neutralization step of neutralizing the acidic wastewater by contact with sodium hydroxide to create a neutral wastewater,
A sand filter step of filtering the neutral wastewater to produce filtered water;
Activated carbon filter step of adsorbing the remaining components of the filtered water and producing the final treated water by contact with ozone water,
Collecting the final treated water, part of the discharge step to discharge ,
A replenishing step of incorporating a portion of at least one of the separation solution from the dehydrator or the final treated water from the discharge tank into the control tank as a replacement water for a part or all of the dilution water
Livestock wastewater treatment method characterized in that it comprises a. The method according to claim 3,
A measuring step of measuring the flow rate of the livestock wastewater solution, the dilution water flow rate, and the replenishment water flow rate respectively flowing into the control tank;
A calculation step of calculating the ratio of the total flow rate of the dilution water and the replenishment water to the flow rate of the livestock wastewater solution;
A control step of adjusting at least one of the flow rate of the dilution water flowing into the control tank and the flow rate of the replenishment water so as to maintain a predetermined dilution ratio of the calculated flow rate;
Livestock wastewater treatment method characterized in that it comprises a.

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