KR100818675B1 - Method of purifying wastewater - Google Patents

Abstract

A method for treating high-concentration organic wastewater is provided to treat the high-concentration wastewater for a short time, and produce organic manure needed for organic farming. Large-sized adulterations are filtered off from high-concentration wastewater and sludge containing fine suspended solids is separated the from high-concentration wastewater through a pretreatment process(S100). The wastewater passed by the pretreatment process is purified to form liquefied fertilizer through a liquefied fertilizer process(S200). The sludge discharged from the pretreatment process and the sludge discharged from the liquefied fertilizer process are deodorized to form manure through a manure process(S300). The wastewater discharged from the pretreatment process is completely purified and discharged, and a thickened liquid generated during purifying of the wastewater is transferred to the liquefied fertilizer process, through a biological treatment process(S400).

Description

Method of purifying wastewater in high concentrations

1 is a process chart for the treatment of high concentration organic wastewater according to the first embodiment of the present invention.

Figure 2 is a process chart for the treatment of high concentration organic wastewater according to a second embodiment of the present invention.

3 is a structural diagram of a fermentor for treating high concentration organic wastewater according to the present invention.

Figure 4 is a structural diagram of a microbial contact reaction stirrer for the treatment of high concentration organic wastewater according to the present invention.

* Description of the symbols for the main parts of the drawings *

S100, S500: pretreatment step S200, S600: liquefaction step

S300, S800: composting step S400, S700: biological treatment step

420,720: Microbial contact reaction stirrer

The present invention relates to a method for treating high concentration organic wastewater, and more particularly, to compost solid components from high concentration organic wastewater such as wastewater, manure and food wastewater discharged, to liquefy liquid components and to deodorize gaseous components. The present invention relates to a method for treating high concentration organic wastewater, which is intended to prevent air pollution while maximizing resource utilization by discharging.

In general, organic wastewater is separated by solid-liquid separation through screen separation, sedimentation, etc., and then discharged after biological treatment combining aerobic treatment, anaerobic treatment, and anoxic treatment.

As described above, the organic wastewater is removed from various organic substances composed of carbon as a constituent of carbon, which is a food source of microorganisms dissolved in the wastewater, as well as nitrogen compounds, phosphorus compounds derived from lipids, etc. resulting from protein decomposition. I would like to.

Hydrocarbons, which are food sources of microorganisms, are relatively easily removed by microorganisms, but nitrogen and phosphorus compounds are not easy to remove, and researches for biologically removing them have been conducted for a long time. It was confirmed that nitrification and denitrification could be carried out in the 1st stage activated sludge process of the 1950s, and biological phosphorus treatment process was removed by biochemical route of microorganism by changing the environmental conditions of the reactor as well as nitrogen removal. Many treatments have been proposed from the results of the study.

By the way, the microbial treatment method as described above shows a relatively excellent effect on the living sewage generated from the city having a relatively low content of organic nitrogen.

However, in the case of livestock wastewater from rural livestock farms, the treatment facilities had to be enormous due to the increase of nitrogen compounds due to the continuous decomposition of the sludge due to the excessive amount of sludge from the livestock. There was a problem that was not practical.

The removal of biological nitrogen is a method that induces cell synthesis and nitrification and denitrification reactions by the assimilation of microorganisms and converts them into nitrogen gas and removes them. The ammonia nitrogen compound is an assimilation of microorganisms such as nitrosomonas and nitrobacter. Is converted to nitrate nitrogen.

Nitrogen nitrogen is changed from anoxic state to a nitrogen gas state by an organic carbon source as an electron donor by heterotropes, which are random heterotrophic microorganisms.

A treatment method developed using the above principle includes a BNR (biological nutrient removal) process, which induces nitrification by maintaining aerobic inside the reactor, and denitrification of nitrified nitrogen under semi-anaerobic conditions. It depends on the arrangement of aerobic and semi-anaerobic reactors, and the research is conducted based on this BNR process, and the Bardenpho process, A / O process, A2 / O process, University of capetown process, Biodeny Biodenipho (Biodenipho) process, Bunnik Bunschoten (BB) process, Carrousel process and Oxidation ditch process have been developed.

However, although many processes have been developed for the treatment of biological nitrogen as described above, there are still many problems in the treatment of livestock manure caused by mass breeding of livestock farms containing a large amount of organic materials.

In addition, the throughput of the high concentration organic wastewater treated in the centrifugation and degassing step is limited, and there is a problem in separating the suspended solids in the wastewater more completely.

The present invention has been made to solve the above problems, an object of the present invention is to liquidize a portion of the organic waste water through the liquid liquefaction step, the sludge generated after this step and the sludge generated in the pretreatment step Fermentation, deodorization, and composting through the composting stage, and organic wastes are converted to fertilizer, which is a nutrient component of plants by fertilizing process, and organic wastes are concentrated in order to achieve fundamental purification measures of water resources. To provide a treatment method of.

The present invention for achieving the above object is a pretreatment step of filtering the relatively large contaminants in the wastewater of high concentration, and the pretreatment step of separating the sludge containing fine solids from the wastewater treatment, the sump tank and the centrifugal solid separator in order; The wastewater from which the contaminants are filtered in the step is purified by passing through the first flow adjusting tank, the microbial reaction stirrer for reacting the waste water with oxygen and activating the microorganisms in the order, and the second flow adjusting tank in order to liquefy liquid fertilizer. And the sludge discharged from the pretreatment step and the sludge discharged from the liquefaction step are stored in a tank and then fermented by injecting external air in an inner downward direction through an air supply pipe, and fermented through a deodorizing member provided at the upper portion of the tank. Deodorize the sludge by passing the odor generated during Microorganisms that filter the part of sludge that flows through the composting step of converting the wastewater, the wastewater discharged from the pretreatment step into a third flow rate adjustment tank and the wastewater by activating the microorganisms inside, and having an adsorption member therein. It includes a biological treatment step of completely purifying and discharged by passing through the contact reaction stirrer, the first settling tank, the active settling tank, the second settling tank, the fourth flow adjusting tank, and the oxidizing filter in order to discharge the concentrated liquid to the liquefaction step. It is characterized by being carried out.

Still another object of the present invention is a pretreatment step of filtering sludge containing relatively large contaminants in a high concentration of wastewater and separating fine sludge from the wastewater of a high concentration in order of a contaminant treatment unit, a sump tank, and a centrifugal solid-separator; A liquefaction step of purifying and filtering the wastewater by a first flow rate adjustment tank, a microbial reaction stirrer for reacting the waste water with oxygen and activating the microorganisms in this order, and then purifying the waste water to fertilize the liquid. The wastewater discharged from the liquefaction step is a centrifugal condensate dehydrator with a flocculant, a third flow adjusting tank, and the wastewater contained in the sludge to react with oxygen to activate microorganisms inside, and an adsorption member is provided to absorb the sludge inside. Microbial contact reaction stirrer to filter out part of sludge through propagation and desorption The biological treatment step of completely purifying by passing through the tank, the active tank, the second settling tank, the fourth flow adjusting tank, and the oxidizing filter in order, and storing the sludge discharged from the pretreatment step, the liquefaction step, and the biological treatment step in a tank. And a composting step of composting the sludge by deodorizing the sludge by injecting external air into the inner lower direction through an air supply pipe and passing the malodor generated during fermentation through a deodorizing member provided on the tank. It is done.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a process chart for the treatment of high concentration organic wastewater according to the first embodiment of the present invention, Figure 2 is a process chart for the treatment of high concentration organic wastewater according to a second embodiment of the present invention.

3 is a structural diagram of a fermentor for treating high concentration organic wastewater according to the present invention, and FIG. 4 is a structural diagram of a microbial contact reaction stirrer for treating high concentration organic wastewater according to the present invention.

As shown in FIG. 1, the method for treating high concentration organic wastewater according to the first embodiment of the present invention is a pretreatment step of separating high concentration sewage into sludge-containing solids containing relatively large contaminants and relatively fine solid suspended solids. (S100), the liquefaction step (S200) to purify the waste water after the pretreatment step (S100) to a part of the liquid fertilizer (S), the sludge generated in the pretreatment step (S100) and the liquefaction step (S200). Fermentation and deodorization by the composting step (S300) and the wastewater generated in the pre-treatment step (S100) to completely purify and discharged, and biological treatment step (S400) to guide the concentrated liquid generated to the liquefaction step (S200) It is characterized by performing in order.

Here, the pretreatment step (S100) is a step of separating the introduced high concentration wastewater into a sludge containing a relatively large contaminant and a relatively fine solid suspended solids.

In particular, the pre-treatment step (S100) to filter the relatively large contaminants from the waste water while passing the wastewater to the contaminant treatment unit 110, to collect the wastewater filtered the contaminants in the water collecting tank 120, centrifugal solid separator (130) Centrifugation of relatively small contaminants.

At this time, the contaminant treatment unit 110 is a known device to filter out relatively large contaminants contained in the waste water, such as manure, nutrients, livestock waste water, domestic waste water.

In addition, the sump tank 120 collects the wastewater that has filtered some large contaminants from the contaminant treatment unit 110, and the centrifugal solid separator 130 rotates at a high speed to form a centrifugal force field to form a large contaminant larger than the wastewater. It is a common device to allow the sediment to be discharged to the outlet at the same time as the sediment is sedimented, while the separated wastewater is flowed in reverse to the sediment.

In addition, the liquefaction step (S200) is a step of preliminarily purifying the wastewater from which the contaminants have been filtered and converting a part of the liquid into a liquid fertilizer.

In particular, the liquefaction step (S200) is to temporarily store the wastewater discharged from the centrifugal solid separator 130 of the pretreatment step (S100) in the first flow rate adjustment tank 210 to adjust the flow rate, the microbial reaction stirrer 220 The waste water reacts with oxygen and activates microorganisms in the inside, and also temporarily stores the microorganism-activated wastewater in the second flow adjusting tank 230 and uses a portion thereof as a liquid ratio.

At this time, the first flow rate adjustment tank 210 stores the wastewater and serves to stably supply the wastewater to the microbial reaction stirrer 220.

In addition, the microbial reaction stirrer 220 is a general apparatus for liquefying by injecting air therein to activate the microorganisms in the waste water.

On the other hand, the composting step (S300) is a process for fermenting and deodorizing the sludge generated in the pretreatment step (S100) and liquefaction step (S200).

At this time, in the liquefaction step (S200), the wastewater generated after the treatment is recycled to the pretreatment step (S100).

In particular, the composting step (S300) is provided with a fermenter 310 to ferment and deodorize the sludge introduced and then compost.

As shown in FIG. 3, the fermenter 310 has a tank 10 forming an external shape, an inlet 11 formed in the tank 10 to introduce sludge, and discharged sludge for composting in a fermented state. To the outlet 12, the tank 10 is inserted into the inside of the air supply tube 13, the air supply pipe 13 for fermenting the sludge by activating microorganisms inside the sludge by introducing external air into the inside, the end of the air supply pipe 13 It is formed to discharge the outside air in the lower direction of the tank 10 to penetrate into the sludge by the air discharge nozzle 14 for maximizing the fermentation and the odor generated during fermentation formed in the upper portion of the tank 10 to filter And made of a deodorizing member (15) for discharging.

At this time, the tank 10 is provided with a condensation receiver 16 in the tank 10 corresponding to the lower portion of the deodorizing member 15 and the relatively low temperature outside air introduced through the deodorizing member 15; Receives condensation water generated when contacting relatively high temperature internal air, and discharges the condensed water to the outside through the discharge port 17 formed on the circumferential surface of the tank 10 to bring the temperature inside the tank 10 to a high temperature Maintaining will shorten the fermentation time.

On the other hand, the biological treatment step (S400) is a process of purifying the final discharge of a portion of the wastewater generated in the centrifugal solid separator 130 and the liquefaction step (S200) of the pretreatment step (S100).

Here, the biological treatment step (S400) is the wastewater generated in the pretreatment step (S100) of the third flow rate adjustment tank 410, microbial contact reaction stirrer 420, the first settling tank 430, the active tank 440, It is a step of completely purifying while passing through the two settling tank 450, the fourth flow rate adjusting tank 460 and the oxidizing filter 470 in order.

More specifically, the biological treatment step (S400) temporarily stores the wastewater generated in the pretreatment step (S100) in the third flow adjusting tank 410, and the growth and desorption of sludge by adsorption in the microbial contact reaction stirrer 420. Part of the sludge is filtered through, and the wastewater is temporarily stored to settle the sludge sludge contained in the wastewater in the first settling tank 430, and the wastewater is activated in the active tank 440.

Thereafter, the second settling tank 450 precipitates the sludge once more, and the fourth flow adjusting tank 460 temporarily stores some of the purified wastewater as the sludge is settled, and the oxidizer 470 The waste water is completely purified and discharged.

And, as shown in Figure 4, the microbial contact reaction stirrer 420 forms an appearance with the body (20).

In addition, the main body 20 has an inlet 20a formed at the lower periphery, a discharge pipe 26 formed at the upper periphery, and has an outlet 21 for discharging gas.

On the other hand, the raw water inlet pipe 22 is inserted into the inlet (20a) of the main body 20.

At this time, each of the raw water inlet pipe 22 is provided with a raw water control valve 23 to adjust the flow control and flow rate of the raw water.

In particular, the raw water inlet pipe 22 is connected to each other by the air inlet pipe 24 at the same time.

Thus, each of the raw water inlet pipe 22 mixes the raw water and the air introduced through the air inlet pipe 24 to guide the inside of the main body 20.

Here, the air flowing into the main body 20 serves to activate and purify the waste water inside the main body 20 with microorganisms.

In addition, the air inlet pipe 24 is provided with an air control valve 25 to control the flow state and flow amount of air.

In addition, the raw water inlet pipe 22 is provided with an air pump (29).

In addition, the main body 20 includes a drain pipe 27 at a lower portion thereof.

In particular, the main body 20 is provided with a discharge pipe 30 in the lower portion of the inside to forcibly eject the water from the outside to improve the solubility in the air air introduced into the interior through the raw water inlet pipe 22 do.

In addition, an ejector 28 is provided at the connection portion between the raw water inlet pipe 22 and the air inlet pipe 24, and the ejector 28 efficiently mixes raw water and air to maximize oxygen dissolution efficiency. Device.

In particular, the main body 20 has a partition member 31 disposed in parallel with each other therein.

As an example, the partition member 31 forms a plurality of flow holes 32 so that the waste water treatment liquid can flow by communicating with the upper and lower portions.

At this time, the flow hole 32 is formed in each partition member 31 to cross each other in the vertical direction, so that the residence time of the inside of the main body 20 of the air rising to be discharged through the outlet 21 of the main body 20 is Is increased.

Thus, microbial activity is enhanced.

On the other hand, the partition member 31 is continuously formed with depressions 33 recessed in the upper direction, respectively.

The depression 33 serves to circulate according to the circulating action performed inside the body 20 while sufficiently storing the air contained in the wastewater treatment liquid at the bottom.

Thus, the body 20 is able to promote the microbial reaction inside.

In addition, as another example, the partition member 31 is formed in each of the independent hatshade shape is connected to the inner surface of the main body 20, it is possible to perform the above action by gaps between each other.

In addition, the main body 20 includes an adsorption member 34 inside the lower portion of the discharge pipe 26 to purify the sludge contained in the waste water to be purified and discharged to the discharge pipe 26.

In addition, the oxidizing filter 470 is a general device for removing the residual audio (COD).

Therefore, the high concentration organic wastewater is treated as part of the liquid while passing through the wastewater generated after the pretreatment step (S100) to the liquid liquefaction step (S200), while the generated sludge goes through the composting step (S300) and the odor It will be deodorized and discharged into the air.

In addition, some of the wastewater generated in the pretreatment step (S100) is purified and discharged while passing through the biological treatment step (S400) to increase resource recycling and reduce air pollution.

In particular, the concentrate generated in the biological treatment step (S400) is transferred to the liquefaction step (S200) and recycled.

On the other hand, as shown in Figure 2, the method for treating high concentration organic wastewater according to the second embodiment of the present invention is to separate the high concentration of wastewater into a sludge containing a relatively large contaminant and relatively fine solid suspended solids After the pretreatment step (S500), after the pretreatment step (S500) to purify the waste water to a part of the liquid liquefaction step (S600), the waste water other than the wastewater used as the liquid ratio in the liquid liquefaction step (S600) completely purify The composting step (S800) of fermentation and deodorization of the sludge generated in the biological treatment step (S700) and the pretreatment step (S500), the liquefaction step (S600), and the biological treatment step (S700) to compost is performed in order. It features.

In the pretreatment step (S500), the wastewater is separated into a contaminant treatment unit 510, a collection tank 520, and a centrifugal solid separator 530 in order to separate the introduced high concentration wastewater into sludge containing relatively large contaminants and relatively fine solid suspended solids. In order to pass in order, the same as the pre-processing step (S100) described above.

In addition, the liquefaction step (S600) is a first flow rate adjustment tank 610, microbial reaction stirrer 620, the second flow rate in order to purify the wastewater from which the contaminant is filtered and to partially convert the liquid into a liquid fertilizer. The step of passing through the adjustment tank 630 in order, the same as the above-described liquefaction step (S200).

In addition, the biological treatment step (S700) is the centrifugal concentration dehydrator 710, the third flow adjustment tank 720, the microbial contact reaction stirrer 730, the first settling tank for wastewater other than the wastewater treated in the liquefaction step (S600) 740, the active tank 750, the second settling tank 760, the fourth flow rate adjusting tank 770 and the oxidizing filter 780 in order to purify and finally discharged.

Here, the concentrated condensate dehydrator performs the same function as the centrifugal solid separator 530, but completely cleans the wastewater by administering a drug that is a microbial flocculant therein.

In addition, the microbial contact reaction stirrer 730 is the same as the above configuration and a detailed description thereof will be omitted.

In addition, the nitrifier 780 is a general device provided to convert ammonia nitrogen remaining by aerobic microorganisms into nitrate nitrogen.

 On the other hand, the composting step (S800) is a sludge generated in the pre-treatment step (S500), liquefaction step (S600) and biological treatment step (S700) and fermented to use as a compost and deodorizing the odor generated during fermentation into the air It is a process of discharging.

In particular, in the composting step (S800), the sludge is fermented and deodorized in the fermentor 810, the fermenter 810 is replaced with the above.

As described above, the method for treating high concentration organic wastewater according to the present invention separates and removes the particle sludge into a relatively small centrifugal (solid-liquid) separator in the pretreatment process of the wastewater, and uses the separated wastewater as a liquid ratio by activating microorganisms. By providing a microbial reaction stirrer, it is possible to treat high concentration of wastewater in a short time, and also organic fertilizer can be supplied with organic fertilizer necessary for organic farming by composting solids with water by centrifugal (concentrated dehydration) separator. It has an effect.

Claims (2)

A pretreatment step of filtering a relatively large contaminant from the wastewater of high concentration by sequentially passing the contaminant treatment unit, the sump tank, and the centrifugal solid separator, and separating the sludge containing the fine solid suspension; In the pretreatment step, the wastewater from which the contaminants are filtered is purified by passing through the first flow regulating tank, the microbial reaction stirrer for reacting the waste water with oxygen, and activating the microorganisms in the inside, and the second flow regulating tank to fertilize the liquid. Liquefaction step; The sludge discharged from the pretreatment step and the sludge discharged from the liquefaction step are stored in a tank and then fermented by injecting external air in an inner downward direction through an air supply pipe, which is generated during fermentation through a deodorizing member provided at the top of the tank. Composting step of composting the sludge by deodorizing by passing the odor; The microbial contact reaction stirrer for filtering the wastewater discharged from the pretreatment step to a third flow rate adjustment tank, the wastewater reacts with oxygen to activate the microorganisms inside, and to filter a portion of the sludge flowing therein with an adsorption member therein. And a biological treatment step of clarifying and discharging the concentrated liquid through the settling tank, the activating tank, the second settling tank, the fourth flow adjusting tank, and the oxidizing filter in order. High concentration organic wastewater treatment method. A pretreatment step of filtering a relatively large contaminant from the wastewater of high concentration by sequentially passing the contaminant treatment unit, the sump tank, and the centrifugal solid separator, and separating the sludge containing the fine solid suspension; In the pretreatment step, the wastewater from which the contaminants are filtered is purified by passing through the first flow regulating tank, the microbial reaction stirrer for reacting the waste water with oxygen, and activating the microorganisms in the inside, and the second flow regulating tank to fertilize the liquid. Liquefaction step; The wastewater discharged from the liquefaction step is a centrifugal condensate dehydrator, a third flow rate adjusting tank, and a sludge containing the sludge to react with oxygen to activate the microorganisms inside, and an adsorption member is provided to absorb the internal microorganisms. A biological treatment step of completely purifying by passing through a microbial contact reaction stirrer, a first settling tank, an active tank, a second settling tank, a fourth flow adjusting tank, and an oxidizer filter in order to filter out a portion of the sludge through the growth and desorption of the sludge; The sludge discharged from the pretreatment step, the liquid liquefaction step, and the biological treatment step is stored in a tank and then fermented by injecting external air in an inner downward direction through an air supply pipe, and generated during fermentation through a deodorizing member provided on the tank. And a composting step of composting the sludge after deodorization by passing the malodor.

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