KR20170119520A - Apparatus for treating discharged wastewater of water treatment process and treatment method thereof - Google Patents

Abstract

The present invention relates to a water treatment apparatus and a treatment method for a water treatment process, and more particularly, to a water treatment apparatus and a treatment method for a water treatment process, which comprises a supply unit for transferring raw water to supply raw water, a flocculation unit for generating flocculation by injecting flocculant into raw water, A drain water treatment section for treating drainage water treated in the membrane filtration section, and a first input section for introducing drainage water and sludge from the membrane filtration section to the drainage treatment section. Therefore, the present invention uses the sludge generated in the membrane filtration section of the water treatment process for drainage water treatment, thereby reusing the sludge in the membrane filtration section, reducing the concentration of contaminants in the drainage water, and reducing the cost of treating waste sludge and effluent water do.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for treating wastewater and a method for treating wastewater,

The present invention relates to a drain water treatment apparatus and a treatment method in a water treatment process, and more particularly, to a drain water treatment apparatus and a treatment method in a water treatment process for additionally treating effluent discharged from a flocculation and membrane filtration process.

To reuse waste water such as treated wastewater and treated wastewater for various purposes in order to prevent the shortage of water, reuse process and system using wastewater from wastewater treatment plant or wastewater treatment plant as raw water are being studied.

In order to reuse discharged water as water, suspended solids, viruses, dissolved solids, refractory materials, odor, and color must be removed from the effluent. In general, a membrane separation process using a separation membrane or an activated carbon adsorption process is mainly used for reuse of effluent water.

However, the effluent contains a considerable amount of suspended matter that does not settle in the sedimentation tank after biological treatment of the sewage treatment plant or wastewater treatment plant. In addition, when the amount of suspended solids increases suddenly due to rainfall in a sewage treatment plant where a bulking phenomenon occurs at the treatment plant or a combined sewerage system is installed, not only the amount of suspended matters in the discharged water is increased but also various suspended matters and dissolved pollutants contained in the rainwater are discharged There is a problem involved.

These suspended substances are frequently adhered to the separation membrane or activated carbon applied to the wastewater treatment process, and these suspended materials not only deteriorate the treatment performance of the separation membrane, but also promote the exchange cycle such as separation membrane and adsorption media, .

Further, in the conventional wastewater treatment apparatus, when treating wastewater, sludge of large particles is separated and discharged in a pretreatment process in a treatment apparatus, that is, in a sedimentation tank applying a screen method or a gravity sedimentation method.

However, in such a conventional wastewater treatment apparatus, a pretreatment facility such as a settling tank is required in the treatment of substances which are harmful to microorganisms and strong acidic or strong alkaline wastewater, so that a facility space for the treatment is excessively required, There is a problem that the effluent treatment efficiency is lowered as well as discharged.

Generally, in the purification process, two types of discharge water are generated. One is the sediment discharge water and the sludge discharged from the sedimentation basin. The other is the backwash discharge water generated in the backwashing process.

The sewage treatment facility of domestic water treatment plant has difficulty in maintenance due to lack of design and operation experience. This is because the turbidity is uniformly applied to the design turbidity to estimate the sludge generation amount and the sludge concentration characteristic in determination of the concentration tank capacity This is because it is designed to uniformly reflect the solid load without fully reflecting it.

The effluent treatment facility that processes the backwashing effluent from the water treatment process is closely related to the water treatment process that produces the water. In order to reduce the raw water cost and recycle water resources, recycling the supernatant to the water treatment process increases the recovery rate It is more economical.

In addition, depending on the degree of treatment of backwashing effluent, it affects the efficiency of the water treatment process and affects the recovery rate of the entire system. In recent years, the discharged water quality standard has become stricter, The importance of washing wastewater treatment has been emphasized.

As a conventional technique for solving such a problem, a water treatment apparatus of Patent No. 10-1233696 and a wastewater treatment apparatus using the same are a water treatment apparatus for collectively treating neutralization and fine particle aggregation of wastewater from which solids have been removed, A second line mixer in which neutralized wastewater and an auxiliary coagulant are mixed, and a first line mixer in which a neutralizing agent and a flocculating agent are mixed, a neutralization reactor for neutralizing wastewater mixed with the neutralizing agent, A flocculation reactor, and a particle separator for separating particles from the coagulated wastewater, wherein the neutralization reactor, the flocculation reactor and the particle separator are kept in an enclosed state shielded from the outside.

As another prior art, Japanese Patent Registration No. 10-1523281 discloses a method for improving the quality of sewage and wastewater or polluted rivers and lakes with a large amount of dissolved substance, and treating a high total phosphorus (TP) , An adsorption reaction tank and a filtration tank, which constitute a system.

As another prior art, Patent No. 10-1001220 relates to an apparatus and method for treating effluent using automatic flocculation control and gravity type fiber filter by the measurement of effluent water quality, and more particularly, to an apparatus and method for treating effluent discharged from sand filtration or membrane filtration A flow rate regulating tank for keeping the flow rate of the effluent water constant; A mixing device for mixing the effluent discharged from the flow rate adjusting tank with a coagulant and a coagulant aid to be added and coagulating; And a gravity type fiber filter for filtering the effluent discharged from the admixture device and returning the treated water to the starting point of the water treatment plant.

However, such a conventional technique has a problem in that it takes a lot of time and cost to treat the effluent water, since a treatment agent such as a separate adsorbent is additionally added or a post-treatment process is required to treat effluent water.

Korean Patent No. 10-1233696 (Feb. 15, 2013) Korean Patent No. 10-1523281 (May 28, 2015) Korean Patent No. 10-1001220 (December 15, 2010)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a drain water treatment device for a water treatment process capable of reusing sludge in a membrane filtration part and reducing pollutant concentration in drain water, And a method for processing the same.

It is still another object of the present invention to provide a drain water treatment apparatus and a treatment method of a water treatment process which can reuse sludge in a settling portion, reduce the concentration of contaminants in drain water, and reduce the costs of treating waste sludge and drain water.

Another object of the present invention is to provide a drain water treatment apparatus and a treatment method of a water treatment process capable of adjusting the amount of the flocculant injected in consideration of the supply amount of the raw water or the contamination concentration of the raw water and the kinds and characteristics of the contaminants contained in the raw water .

Another object of the present invention is to provide a drain water treatment apparatus and a treatment method of a water treatment process capable of adjusting the amount of flocculant injected in consideration of the supply amount of drain water or the contamination concentration of drain water and the kind and characteristics of contaminants contained in drain water .

It is another object of the present invention to provide a drain water treatment apparatus and a treatment method of a water treatment process which can facilitate the mixing of raw water and flocculant or facilitate the mixing of drain water, sludge and flocculant, For other purposes.

According to an aspect of the present invention, there is provided an apparatus for supplying raw water, An agglomeration unit installed downstream of the supply unit and injecting coagulant into the raw water to produce agglomerates; A membrane filtration unit disposed downstream of the coagulation unit for filtering the raw water generated by the coagulation; A drain water treatment unit disposed downstream of the membrane filtration unit and treating drainage water treated in the membrane filtration unit; And a first charging unit installed between the membrane filtration unit and the drain water treatment unit and supplying the drain water and sludge of the membrane filtration unit to the drain water treatment unit.

In addition, the present invention provides a water treatment system comprising: a supply unit for transferring raw water; An agglomeration unit installed downstream of the supply unit and injecting coagulant into the raw water to produce agglomerates; A sedimentation unit installed downstream of the aggregation unit to precipitate aggregates generated in the aggregation unit; A membrane filtration unit disposed downstream of the settling unit for filtering the raw water settled with the aggregate; A drain water treatment unit disposed downstream of the membrane filtration unit and treating drainage water treated in the membrane filtration unit; And a second charging unit disposed downstream of the sedimenting unit and connected between the membrane filtration unit and the drainage treatment unit to inject sludge of the sedimentation unit into the drainage treatment unit.

The flocculating portion of the present invention comprises: a first flocculating tank for producing flocculant in raw water; A first flocculant infusion pump connected upstream of the first flocculation tank to inject the flocculant into the first flocculation tank; And a first flocculant reservoir connected upstream of the first flocculant injection pump and storing the flocculant to supply the flocculant by the first flocculant injection pump. The first flocculation tank of the present invention is characterized in that a stirrer for stirring the raw water and the flocculant is provided.

The drain water treatment section of the present invention comprises: a second flocculation tank for generating an aggregate in the drain water; A second flocculant infusion pump connected upstream of the second flocculation tank to inject the flocculant into the second flocculation tank; And a second flocculant reservoir connected upstream of the second flocculant injection pump and storing the flocculant to supply the flocculant by the second flocculant injection pump.

The second flocculation tank of the present invention is characterized in that an agitator for agitating the effluent and the flocculant is provided. The membrane filtration section of the present invention is characterized by comprising a submerged membrane filter or a pressurized membrane filter.

In addition, the present invention provides a method for supplying raw water, An aggregating step of injecting a coagulant into the supplied raw water to produce an aggregate; A membrane filtration step for membrane filtration of the raw water from which the aggregate is formed; A sludge charging step of charging the sludge in the membrane filtration step to the drain water treatment; And a drain water treatment step of treating the membrane filtration treated effluent with sludge.

In addition, the present invention provides a method for supplying raw water, An aggregating step of injecting a coagulant into the supplied raw water to produce an aggregate; A precipitation step of precipitating the aggregate produced in the raw water; A membrane filtration step of membrane filtration of the raw water in which the aggregate is deposited; A sludge injection step of injecting sludge in the sedimentation step into the effluent treatment; And a drain water treatment step of treating the membrane filtration treated effluent with sludge.

The flocculation step of the present invention is characterized in that the raw water and the flocculant are agitated by a stirrer to produce an aggregate. The effluent treatment step of the present invention is characterized in that the effluent and the sludge are agitated by an agitator to produce agglomerates. The effluent treatment step of the present invention is characterized in that coagulant is further injected into the effluent to produce an aggregate.

As described above, according to the present invention, the sludge generated in the membrane filtration unit of the water treatment process is used for the drain water treatment to reuse the sludge in the membrane filtration unit, reduce the concentration of contaminants in the drain water, Provides a possible effect.

In addition, the present invention uses the sludge generated in the sedimentation portion of the water treatment process for drainage water treatment, thereby reusing the sludge in the sedimentation portion, reducing the concentration of contaminants in the drainage water, and reducing the cost of disposal of waste sludge and effluent water .

Further, by providing the coagulation tank, the coagulant injection pump, and the coagulant storage tank as the coagulation unit, it is possible to control the amount of the coagulant to be injected in consideration of the supply amount of the raw water or the contamination concentration of the raw water, .

Further, by providing the flocculation tank, the flocculant injection pump, and the flocculant storage tank as the drain water treatment unit, it is possible to control the injection amount of the flocculant in consideration of the supply amount of the drain water or the contamination concentration of the drain water, and the kind and characteristics of the contaminants contained in the drain water.

Further, by providing the agitator in the flocculation tank, mixing of the raw water and the flocculant is facilitated, mixing of the effluent water, sludge and flocculant is facilitated, and treatment efficiency of raw water and effluent water is improved.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram showing a drain water treatment apparatus of a water treatment process according to a first embodiment of the present invention; Fig.
2 is a configuration diagram showing a water treatment apparatus for water treatment according to a second embodiment of the present invention.
FIG. 3 and FIG. 4 are graphs showing the treatment results of the water treatment apparatus of the water treatment process according to the first embodiment of the present invention. FIG.
5 is a flow chart showing a method of treating a wastewater in a water treatment process according to the first embodiment of the present invention.
6 is a flow chart showing a drainage water treatment method of the water treatment step according to the second embodiment of the present invention.

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

Fig. 1 is a configuration diagram showing a drain water treatment apparatus according to the first embodiment of the present invention, Fig. 2 is a configuration diagram showing a drain water treatment apparatus according to the second embodiment of the present invention, Fig. 3 And FIG. 4 is a graph showing the processing results of the drain water treatment apparatus of the water treatment process according to the first embodiment of the present invention, FIG. 5 is a flowchart showing the drain water treatment method of the water treatment process according to the first embodiment of the present invention, FIG. 6 is a flowchart showing a drainage water treatment method of the water treatment step according to the second embodiment of the present invention.

1, the drain water treatment apparatus of the water treatment process according to the first embodiment of the present invention includes a supply unit 10, a flocculation unit 20, a membrane filtration unit 40, a first charging unit 50, And a drainage water treatment unit 60. The drainage water treatment apparatus of the water treatment process reuses the sludge generated in the flocculation and membrane filtration water treatment process to the drain water treatment.

The supply unit 10 is preferably a raw water transfer pump for supplying raw water and supplying raw water such as wastewater or contaminated water introduced from the outside by pumping.

The flocculating portion 20 is provided downstream of the supplying portion 10 to inject flocculant into the raw water to produce flocculant. The flocculating portion 20 includes a first flocculating tank 21, a first flocculant infusion pump 22, And a storage tank 23.

The first flocculation tank 21 is a reaction tank for reacting the raw water and the flocculant so as to generate the flocculant in the raw water. The first flocculation tank 21 is provided with the stirrer 21a for stirring the raw water and the flocculant desirable.

The coagulant is a chemical agent which is added to the treated water to precipitate raw water by sedimentation in the water and wastewater treatment so as to facilitate sedimentation in the water treatment. As the agent, polyaluminum chloride, aluminum sulfate, iron sulfate, and sodium aluminate are widely used.

The first flocculant injection pump 22 is connected to the upstream side of the first flocculation tank 21 to inject the flocculant into the first flocculation tank 21, And a coagulant infusion pump that is pumped and pumped into the first flocculation tank 21.

It is needless to say that the first coagulant infusion pump 22 can adjust the infusion amount of the flocculant by the pumping amount of the infusion pump in consideration of the supply amount of the raw water or the contaminant concentration of the raw water and the kind and characteristics of contaminants contained in the raw water .

The first flocculant reservoir 23 is storage means connected upstream of the first flocculant infusion pump 22 and storing the flocculant to supply a predetermined amount of flocculant by the first flocculant infusion pump 22.

The membrane filtration unit 40 is a membrane filtration unit that is provided downstream of the coagulation unit 20 to filtrate the raw water from which coagulation has been generated. The membrane filtration unit 40 includes a submerged membrane filter or a pressurized membrane filter It goes without saying that it can be used.

Particularly, since a large amount of floc is left on the bottom of the submerged membrane filter and a large amount of flocc is left on the bottom of each membrane module of the pressurized membrane filter, It is taken out and treated with sludge.

The first charging unit 50 is disposed between the membrane filtration unit 40 and the drain water treatment unit 60 and supplies sludge such as cohesive flocs or the like treated in the membrane filtration unit 40 to the drain water treatment unit 60, It goes without saying that it is also possible to introduce the sludge and drain water treated in the membrane filtration unit 40 into the drain water treatment unit 60 or to introduce the drain water into the drain water treatment unit 60 through a separate route.

The sludge of the membrane filtration unit 40 is pumped into the drainage treatment unit 60 or the sludge and drainage water of the membrane filtration unit 40 are pumped by the pump, It is also possible to use a transfer pump for input to the processing unit 60.

The effluent treatment section 60 is a effluent treatment section disposed downstream of the membrane filtration section 40 to treat effluent water treated in the membrane filtration section 40. The effluent treatment section 60 includes a second flocculation tank 61, 62 and a second coagulant storage tank 63.

The second flocculation tank 61 is a reaction tank for reacting the effluent water and the flocculant so as to generate an aggregate in the effluent water. The second flocculation tank 61 is provided with an agitator 61a for agitating the effluent and the flocculant desirable.

Such coagulants are polyaluminum chloride, aluminum sulfate, iron sulfate, and the like, which are put into the drain water to facilitate sedimentation in the water treatment by separating the drain water from the drainage water by the flocculation. ), Sodium aluminate and the like are widely used.

The second flocculant injection pump 62 is connected to the upstream side of the second flocculation tank 61 and serves as a flocculant supply means for injecting the flocculant into the second flocculation tank 61, And a coagulant infusion pump which is pumped and pumped into the second flocculation tank (61).

It is needless to say that such a second coagulant infusion pump 62 can control the infusion amount of the flocculant by the pumping amount of the infusion pump in consideration of the supply amount of the raw water or the contamination concentration of the raw water, .

The second flocculant reservoir 63 is storage means connected upstream of the second flocculant infusion pump 62 and storing the flocculant to supply a predetermined amount of the flocculant by the second flocculant infusion pump 62.

Hereinafter, a drain water treatment apparatus of the water treatment process according to the second embodiment of the present invention will be described in detail with reference to the drawings.

2, the drain water treatment apparatus of the water treatment process according to the second embodiment of the present invention includes a supply unit 10, a flocculation unit 20, a sedimentation unit 30, a membrane filtration unit 40, An input unit 70 and a drain water treatment unit 60. The sludge generated in the flocculation and membrane filtration water treatment process is reused in the treatment of drain water.

The supply unit 10 is preferably a raw water transfer pump for supplying raw water and supplying raw water such as wastewater or contaminated water introduced from the outside by pumping.

The flocculating portion 20 is provided downstream of the supplying portion 10 to inject flocculant into the raw water to produce flocculant. The flocculating portion 20 includes a first flocculating tank 21, a first flocculant infusion pump 22, And a storage tank 23.

The first flocculation tank 21 is a reaction tank for reacting the raw water and the flocculant so as to generate the flocculant in the raw water. The first flocculation tank 21 is provided with the stirrer 21a for stirring the raw water and the flocculant desirable.

The coagulant is a chemical agent which is added to the treated water to precipitate raw water by sedimentation in the water and wastewater treatment so as to facilitate sedimentation in the water treatment. As the agent, polyaluminum chloride, aluminum sulfate, iron sulfate, and sodium aluminate are widely used.

The first flocculant injection pump 22 is connected to the upstream side of the first flocculation tank 21 to inject the flocculant into the first flocculation tank 21, And a coagulant infusion pump that is pumped and pumped into the first flocculation tank 21.

It is needless to say that the first coagulant infusion pump 22 can adjust the infusion amount of the flocculant by the pumping amount of the infusion pump in consideration of the supply amount of the raw water or the contaminant concentration of the raw water and the kind and characteristics of contaminants contained in the raw water .

The first flocculant reservoir 23 is storage means connected upstream of the first flocculant infusion pump 22 and storing the flocculant to supply a predetermined amount of flocculant by the first flocculant infusion pump 22.

The sedimenting section 30 is a sedimenting means provided downstream of the aggregating section 20 for sedimenting the aggregates generated in the aggregating section 20 and serves as sedimentation means for keeping the flow rate of the raw water discharged from the aggregating section 20 gently And a sedimentation tank for precipitating the aggregate produced in the raw water.

These sediments are treated with waste sludge and discharged to the outside to be buried or to be treated as waste or to be discharged to the effluent treatment section 60 by the second charging section 70 and reused.

The membrane filtration unit 40 is a membrane filtration unit that is disposed downstream of the settling unit 30 to filter the raw water on which the aggregate has settled. As the membrane filtration unit 40, a submerged membrane filter or a pressurized membrane filter It goes without saying that it can be used.

Particularly, since a large amount of floc is left on the bottom of the submerged membrane filter and a large amount of flocc is left on the bottom of each membrane module of the pressurized membrane filter, It is of course possible to take out and treat it with sludge.

The second input portion 70 is provided downstream of the precipitating portion 30 and is connected between the membrane filtration portion 40 and the drain water treatment portion 60 so that the sludge of the precipitate portion 30 flows into the drain water treatment portion 60 The sludge treated in the settling section 30 is transferred to the drain water treatment section 60 and then introduced.

Needless to say, the second input portion 70 may include a transfer pump for pumping the sludge of the settling portion 30 into the drainage processing portion 60.

The effluent treatment section 60 is a effluent treatment section disposed downstream of the membrane filtration section 40 to treat effluent water treated in the membrane filtration section 40. The effluent treatment section 60 includes a second flocculation tank 61, 62 and a second coagulant storage tank 63.

The second flocculation tank 61 is a reaction tank for reacting the effluent water and the flocculant so as to generate an aggregate in the effluent water. The second flocculation tank 61 is provided with an agitator 61a for agitating the effluent and the flocculant desirable.

Such coagulants are polyaluminum chloride, aluminum sulfate (ium sulfate), iron sulfate (iron sulfate), iron sulfate (iron sulfate) and the like, which are used as drainage agents to facilitate sedimentation during water treatment by sedimentation- sulfate, and sodium aluminate are widely used.

The second flocculant injection pump 62 is connected to the upstream side of the second flocculation tank 61 and serves as a flocculant supply means for injecting the flocculant into the second flocculation tank 61, And a coagulant infusion pump which is pumped and pumped into the second flocculation tank (61).

It is needless to say that such a second coagulant infusion pump 62 can control the infusion amount of the flocculant by the pumping amount of the infusion pump in consideration of the supply amount of the raw water or the contamination concentration of the raw water, .

The second flocculant reservoir 63 is storage means connected upstream of the second flocculant infusion pump 62 and storing the flocculant to supply a predetermined amount of the flocculant by the second flocculant infusion pump 62.

Therefore, in the experimental example in which the effluent was treated using the effluent treatment apparatus of the water treatment process according to the first and second embodiments of the present invention, as shown in Figs. 3 and 4, the effluent water was sampled and placed on a laboratory scale .

First, the lake water was filtered to form drainage water. Lake water was flocculated and precipitated to form sludge. The sludge was put into drain water, and rapid stirring and slow stirring were carried out to measure water quality.

In this experiment, the turbidity was measured with a turbidimeter after filtration with a 0.45 mm filter, which represented the amount of colloidal material in water, and UV254 was the absorbance measured at 254 nm As shown in FIGS. 3 and 4, the effluent treatment apparatus of the present invention can confirm that the turbidity of the effluent water is reduced by about 8% and the UV254 of the effluent water is reduced by about 19% , It can be seen that the water treatment performance is improved by injecting waste sludge into the effluent.

Hereinafter, a waste water treatment method using the waste water treatment apparatus of the water treatment process according to the first embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG.

As shown in Figs. 1 and 5, the effluent treatment method using the effluent treatment apparatus of the water treatment process according to the first embodiment of the present invention includes a raw water supply step S10, an agglomeration step S20, a membrane filtration step S40 ), A sludge injection step (S50), and a drainage water treatment step (S60). The sludge generated in the flocculation and membrane filtration water treatment process is reused in the treatment of drainage water.

The raw water supply step (S10) is a step of feeding raw water and supplying raw water such as wastewater or contaminated water introduced from the outside by pumping raw water.

The flocculating step S20 is a step of injecting an aggregating agent into the raw water supplied in the raw water supplying step S10 downstream of the raw water supplying step S10 to generate an aggregate. The raw water and the flocculating agent are stirred by a stirrer to produce an aggregate Of course it is also possible

In addition, the coagulant supplied to the raw water to produce the coagulum in the raw water is a medicament to be fed into the treated water to precipitate and separate the raw water by coagulation in the water and wastewater treatment and to facilitate sedimentation in the water treatment, ), Aluminum sulfate, iron sulfate, sodium aluminate, and the like are widely used.

The membrane filtration step (S40) is a step of filtrating the raw water in which coagulation has been generated in the coagulation step (S20) downstream of the coagulation step (S20), using a submerged membrane filter or a pressurized membrane filter, A large amount of floc is left on the bottom of the filter and a large amount of floc is left in the lower part of each membrane module of the pressurized membrane filter. Therefore, such a large amount of coagulated flocs is taken out and treated with sludge .

The sludge inputting step S50 is a step of injecting the sludge of the membrane filtration step S40 downstream of the membrane filtration step S40 into the drain water treatment so that the sludge such as the coagulated flocs or the like treated in the membrane filtration step S40, It is also possible to put the waste water into the drain water treatment step S60 or to introduce the drain water into the drain water treatment step S60 through a separate route.

In this sludge introduction step S50, the sludge in the membrane filtration step S40 is pumped by the pumping pump to enter the drain water treatment step S60, or the sludge and drain water in the membrane filtration step S40 are pumped It is also possible to pressurize the waste water and add it to the drain water treatment step S60.

The draining water treatment step (S60) is a step of treating draining water subjected to the membrane filtration in the membrane filtering step (S40) by the sludge, and it is also possible to generate the aggregate by stirring the draining water and the sludge by the stirrer.

It goes without saying that, in the drain water treatment step (S60), not only the sludge but also the flocculant may be further injected into the drain water to produce an aggregate. Such coagulants are polyaluminum chloride, aluminum sulfate (ium sulfate), iron sulfate (iron sulfate), iron sulfate (iron sulfate) and the like, which are used as drainage agents to facilitate sedimentation during water treatment by sedimentation- sulfate, and sodium aluminate are widely used.

Hereinafter, referring to Figs. 2 and 6, the waste water treatment method using the waste water treatment apparatus of the water treatment process according to the second embodiment of the present invention will be described in detail.

2 and 6, the effluent treatment method using the effluent treatment apparatus of the water treatment process according to the second embodiment of the present invention includes a raw water supply step S10, an agglomeration step S20, a sedimentation step S30, , A membrane filtration step (S40), a sludge input step (S70), and a drain water treatment step (S60), and the sludge generated in the flocculation and membrane filtration water treatment process is reused in the treatment of drain water .

The raw water supply step (S10) is a step of feeding raw water and supplying raw water such as wastewater or contaminated water introduced from the outside by pumping raw water.

The flocculating step S20 is a step of injecting an aggregating agent into the raw water supplied in the raw water supplying step S10 downstream of the raw water supplying step S10 to generate an aggregate. The raw water and the flocculating agent are stirred by a stirrer to produce an aggregate Of course it is also possible

In addition, the coagulant supplied to the raw water to produce the coagulum in the raw water is a medicament to be fed into the treated water to precipitate and separate the raw water by coagulation in the water and wastewater treatment and to facilitate sedimentation in the water treatment, ), Aluminum sulfate, iron sulfate, sodium aluminate, and the like are widely used.

The sedimentation step S30 is a step of precipitating the agglomerates generated in the raw water in the agglomeration step S20 so as to keep the flow rate of the raw water discharged in the agglomeration step 20 gently to maintain the aggregate produced in the raw water in the sedimentation tank .

The sediment is treated with waste sludge, discharged to the outside, buried or treated with waste, or sludge is injected into the effluent treatment step S60 through a sludge injection step S70 and reused.

The membrane filtration step S40 is a step of filtrating the raw water precipitated with the agglomerate in the sedimentation step S30 downstream of the sedimentation step S30 using a submerged membrane filter or a pressurized membrane filter, A large amount of floc is left on the bottom of the filter and a large amount of floc is left in the lower part of each membrane module of the pressurized membrane filter. Therefore, such a large amount of coagulated flocs is taken out and treated with sludge .

The sludge injection step S70 is a step of injecting the sludge in the sedimentation step S30 downstream of the sedimentation step S40 into the effluent treatment in the effluent treatment step S60 and the sedimentation step S30, Sludge such as floc is introduced into the drain water treatment step S60.

In the sludge input step S70, the sludge in the settling step S30 is pumped by the pumping pump to enter the drain water treatment step S60, and reacts with the drain water discharged in the membrane filtration step S40, .

The draining water treatment step S60 is a step of reprocessing the drained water subjected to the membrane filtration in the membrane filtration step S40 by the sludge, and it is also possible to generate the aggregate by stirring the draining water and the sludge by the stirrer.

In addition, in the drain water treatment step (S60), it is also possible to add flocculant as well as sludge to the drained water subjected to the membrane filtration in the membrane filtration step (S40). Such coagulants are polyaluminum chloride, aluminum sulfate (ium sulfate), iron sulfate (iron sulfate), iron sulfate (iron sulfate) and the like, which are used as drainage agents to facilitate sedimentation during water treatment by sedimentation- sulfate, and sodium aluminate are widely used.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the sludge generated in the membrane filtration section of the water treatment process is used for the drain water treatment to reuse the sludge in the membrane filtration section to reduce the concentration of contaminants in the drain water, Provides a possible effect.

In addition, the present invention uses the sludge generated in the sedimentation portion of the water treatment process for drainage water treatment, thereby reusing the sludge in the sedimentation portion, reducing the concentration of contaminants in the drainage water, and reducing the cost of disposal of waste sludge and effluent water .

Further, by providing the coagulation tank, the coagulant injection pump, and the coagulant storage tank as the coagulation unit, it is possible to control the amount of the coagulant to be injected in consideration of the supply amount of the raw water or the contamination concentration of the raw water, .

Further, by providing the flocculation tank, the flocculant injection pump, and the flocculant storage tank as the drain water treatment unit, it is possible to control the injection amount of the flocculant in consideration of the supply amount of the drain water or the contamination concentration of the drain water, and the kind and characteristics of the contaminants contained in the drain water.

Further, by providing the agitator in the flocculation tank, mixing of the raw water and the flocculant is facilitated, mixing of the effluent water, sludge and flocculant is facilitated, and treatment efficiency of raw water and effluent water is improved.

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, the above embodiments are merely illustrative in all respects and should not be construed as limiting.

10: supply part 20:
30: settling portion 40: membrane filtration portion
50: first charging unit 60: discharging water treatment unit
70:

Claims (12)

A supply unit for transferring and supplying seawater;
An agglomeration unit installed downstream of the supply unit and injecting coagulant into the raw water to produce agglomerates;
A membrane filtration unit disposed downstream of the coagulation unit for filtering the raw water generated by the coagulation;
A drain water treatment unit disposed downstream of the membrane filtration unit and treating drainage water treated in the membrane filtration unit; And
And a first charging unit installed between the membrane filtration unit and the drain water treatment unit for charging drain water and sludge of the membrane filtration unit to the drain water treatment unit. A feeder for feeding and supplying raw water;
An agglomeration unit installed downstream of the supply unit and injecting coagulant into the raw water to produce agglomerates;
A sedimentation unit installed downstream of the aggregation unit to precipitate aggregates generated in the aggregation unit;
A membrane filtration unit disposed downstream of the settling unit for filtering the raw water settled with the aggregate;
A drain water treatment unit disposed downstream of the membrane filtration unit and treating drainage water treated in the membrane filtration unit; And
And a second charging unit installed downstream of the sedimenting unit and connected between the membrane filtration unit and the drainage treatment unit to inject sludge of the sedimentation unit into the drainage treatment unit. 3. The method according to claim 1 or 2,
The coagulation unit may include:
A first flocculating tank for producing flocculant in raw water;
A first flocculant infusion pump connected upstream of the first flocculation tank to inject the flocculant into the first flocculation tank; And
And a first flocculant reservoir connected upstream of the first flocculant injection pump and storing the flocculant to supply the flocculant by the first flocculant injection pump. The method of claim 3,
Wherein the first flocculation tank is provided with an agitator for agitating the raw water and the flocculant. 3. The method according to claim 1 or 2,
The drain water treatment section
A second flocculation tank for generating flocculation in the drain water;
A second flocculant infusion pump connected upstream of the second flocculation tank to inject the flocculant into the second flocculation tank; And
And a second flocculant reservoir connected upstream of the second flocculant injection pump and storing the flocculant to supply the flocculant by the second flocculant injection pump. 6. The method of claim 5,
Wherein the second flocculation tank is provided with an agitator for agitating the effluent and the flocculant. 3. The method according to claim 1 or 2,
Wherein the membrane filtration unit comprises a submerged membrane filter or a pressurized membrane filter. A raw water supply step of transferring and supplying raw water;
An aggregating step of injecting a coagulant into the supplied raw water to produce an aggregate;
A membrane filtration step for membrane filtration of the raw water from which the aggregate is formed;
A sludge charging step of charging the sludge in the membrane filtration step to the drain water treatment; And
And a drain water treatment step of treating the membrane filtration treated effluent with sludge. A raw water supply step of transferring and supplying raw water;
An aggregating step of injecting a coagulant into the supplied raw water to produce an aggregate;
A precipitation step of precipitating the aggregate produced in the raw water;
A membrane filtration step of membrane filtration of the raw water in which the aggregate is deposited;
A sludge injection step of injecting sludge in the sedimentation step into the effluent treatment; And
And a drain water treatment step of treating the membrane filtration treated effluent with sludge. 10. The method according to claim 8 or 9,
Wherein the flocculating step comprises agitating the raw water and the flocculant with a stirrer to produce an aggregate. 10. The method according to claim 8 or 9,
Wherein the effluent treatment step comprises agitating the effluent and the sludge by an agitator to produce an agglomerate. 12. The method of claim 11,
Wherein the effluent treatment step further comprises the step of injecting a coagulant into the effluent to produce an agglomerate.

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