KR100355880B1 - Purification disposal method and device of stock raising waste water - Google Patents

Abstract

The present invention relates to a method for treating livestock wastewater and a treatment apparatus. When the livestock wastewater is treated by a conventional liquid corrosion method, an electrolysis method, or a hollow fiber membrane method, the pH value is initially lowered to some extent, but time is passed through various treatment tanks. As the pH level rose again over the course of time, it was treated only in a continuous manner, resulting in poor biological treatment.

Accordingly, the present invention is the screen tank 100, collection tank 120, filtration tank 130, anaerobic tank 140, flow adjustment tank 160, aeration tank 190, biofilm tank, sedimentation tank, circulating water tank 260, discharge tank ( In order to purify the livestock wastewater by passing through 280 sequentially, before the wastewater is collected in the collection tank 120, the neutralizing agent is added to adjust the primary PH, and the primary biofilm treatment is performed before entering the flow regulating tank 160. Increase culture efficiency; Performing a secondary PH adjustment and centrifugation of the sludge before entering the aeration tank 190; Performing a secondary biofilm treatment step after the aeration process and an internal conveyance step for spraying the treated water, and performing precipitation of the sludge by performing a plurality of precipitation steps after the coagulation step of the coagulation tank 240; The filtration process is performed before flowing into the disinfection discharge tank 280 from the circulation water tank 260 to improve biological treatment efficiency and to allow the treated water to be discharged in a highly treated state.

Description

Purification disposal method and device of stock raising waste water

The present invention relates to a method and apparatus for purifying livestock wastewater, in particular, by neutralizing a hydrogen ion index (PH: hereinafter referred to as PH) which rises over time to increase the culture efficiency of livestock wastewater The present invention relates to a method and apparatus for purifying livestock wastewater that can improve treatment efficiency.

In general, wastewater discharged from livestock farms such as poultry farms, pig farms, and dairy farms raises the environmental pollution considerably, thus reducing the biological oxygen demand BOD (hereinafter referred to as "BOD") as much as possible. Is regulated by law, and for this purpose, a livestock farm that discharges a lot of livestock wastewater must have a treatment facility for livestock wastewater purification.

As described above, when analyzing the concentration of pollutants in livestock wastewater discharged from livestock farms, PH = 7 ~ 12, BOD = 2,500 ~ 27,000mg / l, SS (colloid) = 800 ~ 8,000mg / l, COD = 2,000 ~ 13,000 ㎎ / ℓ, TN (nitrogen) = 1,000 ~ 8,900mg / ℓ, TP (phosphorus) = 60 ~ 400mg / ℓ, since each farm can vary only the treatment method is very different, such as the need to be different for each farm It is a difficult wastewater, especially in the pig industry, especially when it comes to the treatment of pig wastewater.

Behind this reality is the current use in the livestock wastewater treatment industry, despite the challenges of considering the complex conditions such as economic conditions of each farm, local or land problems, manpower and management conditions, and post-maintenance and facility costs. In terms of treatment methods, liquid corrosion, electrolysis, hollow fiber membranes, and RO systems are used.

However, they are all used under the introduction of foreign technology or under a technology contract, and also import and use important core parts and technology equipment in foreign countries, and the maintenance cost must be followed by the overall replacement of important parts between four months and one year after installation. It is a situation that causes a lot of distrust and dissatisfaction of the farmers, such as a considerable amount of use.

In addition, pigs wastewater, especially piglet wastewater, undergoes an oxidation or corrosion process gradually over time after pigs excrete. At this time, the pig wastewater increases from 8 to 11 with increasing pH, becoming more alkaline. According to the treatment method such as electrolysis method, hollow fiber membrane method, RO system, ozone treatment method, biological treatment (anaerobic, aerobic treatment) is not performed well.

That is, even though the pH value is initially lowered to some extent by initially treating the swine wastewater with the above-described various treatment methods, while the pig wastewater passes through various treatment tanks and the pH value rises over time, the conventional water does not know this fact and continues. The treatment was carried out in the same way only, the conventional treatment method is only 40 to 50% of the biological treatment is not done properly, but the current situation of swine wastewater remains a problem in the wastewater treatment industry.

Therefore, the present invention has been invented to solve the conventional problems as described above, the object of the present invention is very ideally treated biological animal wastewater treatment, especially piglet wastewater, which gradually increases the pH value over time The present invention provides a method and apparatus for purifying livestock wastewater, which is low in cost and low in maintenance costs.

The object of the present invention is to neutralize the pH contained in the livestock wastewater using a neutralizing agent (ferric chloride (Fec13), etc.) to neutral and at the same time to cause the flocculation reaction and then to precipitate the first precipitation, This is achieved by configuring a method and apparatus for purifying livestock wastewater to oxidize iron to precipitate sediment by aerobicity.

In the present invention, since the livestock wastewater is neutralized with iron chloride while passing through various treatment tanks, the pH value is gradually lowered without increasing even if time passes considerably, so that biological treatment can be ideally performed to achieve the above object effectively. have.

1 is a block diagram showing a processing process of the present invention in a flow diagram

Figure 2a is a process diagram illustrating the treatment process from the collection tank to the coagulation tank in sequence in the treatment process of the present invention

Figure 2b is a process diagram illustrating the treatment process from the final settling tank to the disinfection discharge tank in sequence in the treatment process of the present invention

Figure 3 is a chemical tank line supplying neutralizer, flocculant, disinfectant, etc. in the present invention

4 is a view showing a centrifugation tank and a treatment tank for concentrating and condensing sludges collected in each settling tank;

Explanation of symbols for the main parts of the drawings

110: primary PH adjusting tank 120: water collecting tank

140: anaerobic tank 150: primary biofilm tank

170: secondary PH adjusting tank 180: centrifugal separation tank

190: aeration tank 200: secondary biofilm tank

210: 1st precipitation tank 220: 3rd PH adjustment tank

230: internal return tank 250: final sedimentation tank

270: filtration tank 280: disinfection discharge tank

300: sludge concentration storage tank

Hereinafter will be described in detail with reference to the accompanying drawings, a preferred embodiment for the technical configuration and action that can effectively achieve the object of the present invention.

1 is a block diagram showing a processing process of the present invention in a flow diagram, Figure 2a is a process diagram sequentially illustrating a process from the collection tank to the coagulation tank during the treatment process of the present invention, Figure 2b is a process of the present invention Process diagram illustrating the process from the final settling tank to the disinfection discharge tank during the process, Figure 3 is a view illustrating a line of the chemical tank supplying a neutralizer, flocculant, PAC, disinfectant, etc. in the present invention, Figure 4 is centrifugation The figure shows the treatment tank which concentrates and condenses the sludge collect | recovered from a tank and each sedimentation tank.

In the treatment apparatus of the present invention shown in the screen tank 100 to filter the contaminants while collecting livestock wastewater inflow tank 120, filtering the various floats and contaminants filtration tank 130, anaerobic tank 140, flow adjustment tank 160 ), The air is supplied through the aeration tank 190 to aerated waste water, a biofilm tank in which aerobic microorganisms are cultured, a sedimentation tank to precipitate sludge, a circulating water tank 260, and a discharge tank 280 to disinfect and purify purified water in order. It can be said that it is the same as the conventional processing apparatus.

A feature of the present invention is provided with a primary PH adjusting tank 110 between the screen tank 100 and the collection tank 120, the primary biofilm tank 150 between the anaerobic tank 140 and the flow rate adjusting tank 160 The secondary PH adjusting tank 170 and the centrifugation tank 180 are installed between the flow rate adjusting tank 160 and the aeration tank 190, and the secondary biofilm tank 200 is installed after the aeration tank 190. Then, the first settling tank 210, the third PH adjusting tank 220 and the aeration tank 190, the inner conveying tank 230, the flocculation tank 240 for spraying the treated water is provided in order.

In addition, a plurality of final settling tanks 250 are installed between the coagulation tank 240 and the circulation water tank 260, and a filtration tank 270 is installed between the circulation water tank 260 and the disinfection discharge tank 280. Various sludges such as sludge precipitated in the centrifugation tank 180 and the plurality of settling tanks 210 and 250 are dehydrated through the sludge concentrate storage tank 300 and the sludge reaggregation tank 310 in order to be fertilized. It features.

When explaining the configuration of the present invention in more detail the process of treating the wastewater in detail as follows.

As shown in FIG. 2, the screen tank 100 into which the waste water flows in is installed with a detail screen to separate the feed of the micro-pollution mixed with about 10% of the wastewater into the waste water. In addition, since the anaerobic reactivity pH is strongly alkaline, there are many obstacles to the growth of microorganisms, and therefore, in the first PH adjusting tank 110, neutralizing agents such as ferric chloride (Fec13) and lactic acid alumina (Fec13) in the waste water through the chemical tank of FIG. Primary PH adjustment is performed by adding a flocculant such as Al ₂ (S0 ₄ ) ₃ 18H ₂ 0).

If necessary, the primary PH adjusting tank 110 is sprayed with water through a bubble vesicle line (ⓔ) to adjust the pH while defoaming the bubbles, and when adjusting the pH as described above, a large amount of precipitates are generated by the neutralization flocculation reaction. At this time, the sediment is transferred to the sludge and the condensate by the screw pump to the sludge concentration storage tank 300, when only the waste water flows into the upward filtration tank 130, the filtration tank 130 once again blocks the contaminants and is filtered to prevent clogging.

In addition, the anaerobic tank 140 is focused on the anaerobic reaction, and may be installed in one tank or plural according to the situation, and the wastewater passing through the anaerobic tank 140 may be cultured of aerobic microorganisms in the primary biofilm tank 150. Let this be done. At this time, it is preferable to install a rotary contact biofilm device in the primary biofilm tank 150 in which only a part of the rotary contact cylinder 151 is rotated in the waste water while the contact member is filled in the rotary contact cylinder 151. Do.

That is, when only a part of the rotary contact cylinder 151 of the primary biofilm tank 150 is immersed in the waste water and the remaining part is exposed to the air, when the rotary contact container 151 comes out of the waste water into the atmosphere. Since it is supplied with air, it does not need to supply oxygen. Especially, unlike the general aeration type aerobic tank, there is no foaming and the removal rate of the contaminants (SS) is very ideal.

In addition, the primary biofilm tank 150 may be installed in series or in parallel as an anaerobic tank, and may be supplied with oxygen to supply oxygen about 0.1 to 1 PPM by installing an anaerobic tank. 140).

The flow rate adjusting tank 160 serves to transfer the anaerobic reaction and the wastewater treated in the primary biofilm tank 150 to the average flow rate when it is sent to the next step, wherein the wastewater that has undergone the anaerobic reaction tank as described above is subjected to NH3- in an anaerobic reaction. PH rises again by the N component. Therefore, in the present invention, the wastewater conveyed to the average flow rate by the flow rate adjustment tank 160 is introduced into the secondary PH adjustment tank 170 to neutralize again.

That is, in the secondary PH adjusting tank 170, a neutralizing agent, such as ferric chloride (Fec13), is added to adjust the secondary PH. At this time, the coagulation reaction occurs due to neutralization, and thus, in case of a large capacity, centrifugation as shown in FIG. Centrifugation in the tank (180) or a pre-treatment settling tank is installed in one tank or a plurality of tanks to be separated into solid-liquid and then transferred to the aeration tank 190, which is the next process.

Here, the component data of the wastewater measured after treating the livestock wastewater in the primary PH adjusting tank and the secondary PH adjusting tank according to the present invention is as follows.

Test Items Test result Influent before treatment 1st PH adjustment treatment 2nd PH adjustment treatment BOD (mg / ℓ) 7,714.3 5,142.9 152.8 COD (mg / L) 3,762.0 1,702.8 134.6 T-N (mg / L) 3,424.4 3,575.3 510.18 T-P (mg / ℓ) 255.59 21.936 0.488 SS (mg / ℓ) 4,530.0 44 940.0

As shown in the table above, the neutralization treatment in the primary PH adjustment tank 110 without undergoing the anaerobic treatment and the primary biofilm tank 150 is only 33.3% for the BOD, but the anaerobic treatment and the primary biofilm tank 150 are When the wastewater is neutralized in the secondary PH adjustment tank 170 and then centrifuged or precipitated in the centrifugation tank 180, the treatment efficiency of biological oxygen demand (BOD) and chemical oxygen demand (COD) is 98%, respectively. And 96.4% showed high processing efficiency. At this time, the impurity (SS) was rather higher, but because it did not give enough settling time at the time of measurement, giving the settling time sufficiently reduced the contaminant significantly.

Waste water treated as described above is introduced into the aerobic reaction treatment tank consisting of aeration tank 190 and the secondary biofilm tank 200, in the aerobic reaction treatment tank 2 aeration tank 190 to stay for 3 days or more (70 hours or more). It is preferable to install a plurality of sets of four sets. At this time, the aeration tank 190 uses a method of aeration in a floating manner without introducing a contact material, the secondary biofilm tank 200 has a high porosity and a large specific surface area without the clogging phenomenon with good adsorption power of sludge. It is better to install by filling the inclined plate-type contact material, and sprinkling in the bubble spray line (E) to remove the bubbles and aeration with an aerator to promote microbial culture efficiency.

The most important characteristic of the aeration tank 190 is that during the pre-treatment process of the first and second PH adjustment tanks 110 and 170 over time during the aeration, the pH was clearly neutralized and introduced after lowering the PH. Since the pH rises again and is not well treated, it is preferable to use the following method to suppress the rise of PH in the aeration tank 190 and the secondary biofilm tank 200.

First: How to automatically control the PH by installing a PH sensor (PHIC) for each aeration tank (190) (This method has a problem of rising costs due to the installation of a PH sensor, but the most quickly and accurately Can be controlled.)

Second: In the process of internal transfer from the last aeration tank to the first aeration tank among a plurality of aeration tanks (190) by placing a separate PH adjustment tank so that the PH is returned to the first aeration tank in the neutral treatment state

Third: the secondary biofilm tank 200, followed by the primary sedimentation tank 210, the tertiary PH adjusting tank 220 and the inner conveying tank 230 in order to return the third PH adjusted wastewater to the first aeration tank 190 How to let

Here, when the ferric chloride is used as the neutralizing agent even during the pH adjustment, the iron is oxidized so that the sedimentation and separation in the primary sedimentation tank 210, which is the next process of the secondary biofilm tank 200, is performed well, so that the total phosphorus (TP) ) And total nitrogen (TN) can be treated with high efficiency.

In Figure 2 of the present invention is shown in the third method, the treated water (wastewater) in which a large amount of sludge sludge is precipitated in the primary sedimentation tank 210 to adjust the pH again in the tertiary PH adjustment tank 220.

That is, since the pH rises again due to the oxidation reaction during the aeration process, it is a characteristic of the livestock wastewater, and in contrast, the third pH adjustment tank 220 injects a neutralizer (iron chloride) again to adjust the third PH. Then, the pH of the third pH adjusted wastewater is lowered to 7, and the internal transport tank 230, by returning the third pH adjusted wastewater to the first aeration tank to suppress the rise in pH in the aeration tank 190, thereby promoting the culture of microorganisms As such, the present invention selects one of the first, second, and third methods according to the site situation to suppress the increase in PH.

Then, when the wastewater flows into the coagulation tank 240 in the inner conveying tank 230, the coagulation tank 240 is reaggregated before sedimentation and separation of the completely oxidized wastewater, the waste water aggregated in the coagulation tank 240 in this way Must be introduced into the final settling tank 250 of FIG. 2b to double the sedimentation efficiency of the sludge. Such a final settling tank 250 is conventionally installed, but in some cases, as shown in Figure 1 in two sets in series can increase the final settling efficiency.

Then, the wastewater that has passed through the final settling tank 250 is sent to the filtration tank 270 through the circulating water tank 260 to be filtered to further process the final treated water, part of the filtered water thus returned is Through the line (ⓙ) to the first collecting tank 120 to send the parcel, the rest is sent to the disinfection discharge tank 280, the disinfectant is put in and discharged, and the treated water discharged in this manner is discharged even after time Since the pH does not rise again, environmental pollution can be reduced, and a bleaching agent may be injected to remove residual color.

In addition, the sludge sludge collected in the centrifugation tank 180 and the primary sedimentation tank 210 and the final sedimentation tank 250 is a sludge concentration storage tank 300 as shown in FIG. 4 through a pipe line (ⓖ, ⓗ, ⓘ, ⓚ). ) And sludge sent to the reaggregation tank 310 and concentrated to compost or liquid compost or mixed with sawdust or crested can be very useful as a natural compost while reducing environmental pollution.

As described above, in the present invention, since the livestock wastewater is neutralized with neutralizing agent (iron chloride) for three times while passing through various treatment tanks, even if time passes considerably, the pH value does not rise but gradually decreases. When lowered, the culture efficiency of microorganisms can be increased, and sedimentation sludge produced by oxidizing iron in wastewater with neutralizing agent is precipitated and removed several times in intermediate sedimentation tank, so that biological treatment efficiency of livestock wastewater is considerably improved, which makes the livestock wastewater ideally treated. The maintenance cost according to the operation is low, there is no burden on the livestock farms installed and used.

Claims (5)

Screen tank (100) for filtering contaminants, collecting tank (120), filtration tank (130) for filtering various fine floats and contaminants, anaerobic tank (140), flow adjustment tank (160), aeration tank (190) for aeration of waste water, aerobic microorganisms In the livestock wastewater purification treatment method which is discharged to the disinfection discharge tank 280 through this biofilm tank to be cultured, the sedimentation tank of sludge, the circulation water tank 260, Before the wastewater passing through the screen tank 100 is collected in the water collecting tank 120, a process for performing primary PH adjustment by adding a neutralizing agent; Performing a step of culturing the microorganisms by treating the primary biofilm before entering the flow control tank 160 in the anaerobic tank 140; Performing a step of centrifuging the secondary PH and the sludge before flowing into the aeration tank 190 from the flow regulating tank 160; After performing the secondary biofilm treatment process through the aeration process in the aeration tank 190 and performing an internal transfer step of spraying the treated water to the primary sedimentation tank 210, the tertiary PH adjusting tank 220 and the aeration tank 190, A step of precipitating and removing sludge by performing a plurality of precipitation processes after the flocculation tank 240; Filtration process before flowing into the disinfection discharge tank 280 in the circulation water tank 260 to purify the livestock wastewater, characterized in that the treated water is highly treated and discharged. The method according to claim 1, wherein the plurality of aeration tanks (190) during the aeration of the PH by detecting the sensor (PHIC) so that the pH is automatically controlled individually. According to claim 1, characterized in that during the process of the internal transfer from the last aeration tank to the first aeration tank of the plurality of aeration tanks 190 by adjusting a separate PH to be internally returned to the first aeration tank in the state of re-processing neutral Livestock wastewater purification treatment method. Screen tank (100) for filtering contaminants, collecting tank (120), filtration tank (130) for filtering various fine floats and contaminants, anaerobic tank (140), flow adjustment tank (160), aeration tank (190) for aeration of waste water, aerobic microorganisms In the apparatus for treating livestock wastewater comprising the biofilm tank, sludge settling tank, circulating water tank 260, and disinfection discharge tank 280 to be cultured, A primary PH adjusting tank 110 is provided between the screen tank 100 and the collecting tank 120, and a primary biofilm tank 150 is installed between the anaerobic tank 140 and the flow adjusting tank 160, and the flow rate is A secondary PH adjusting tank 170 and a centrifugation tank 180 are installed between the adjusting tank 160 and the aeration tank 190, and then the secondary biofilm tank 200 is installed after the aeration tank 190, and then The first settling tank 210, the third PH adjusting tank 220 and the aeration tank 190, the inner conveying tank 230, the flocculation tank 240 for spraying the treated water are installed in sequence, and the flocculation tank 240 and circulation Livestock wastewater, characterized in that a plurality of final sedimentation tanks 250 are installed between the water tanks 260, and a filtration tank 270 is installed between the circulation water tank 260 and the disinfection discharge tank 280. Purification treatment unit. According to claim 4, the primary biofilm tank 150 is installed in series or in parallel, such as anaerobic tank 140, the acid pipe is installed to supply oxygen about 0.1 ~ 1 PPM, and the anaerobic tank again in the next process Livestock wastewater purification treatment device, characterized in that 140 is installed.