KR20220096414A - Apparatus for treating waste water using iron oxide powder - Google Patents

Abstract

The present invention relates to a water treatment device using powdered iron oxide that treats sewage or wastewater using powdered iron oxide. and a sludge treatment unit for recovering the powdered iron oxide contained in the sludge for reuse in the water treatment unit. Therefore, the present invention improves the sedimentation property primarily by increasing the contact between the microbial floc and the powdered iron oxide by injecting powdered iron oxide, and increases the integration and treatment efficiency in the sewage and wastewater treatment system according to the increase in the amount of microorganisms in the sludge returned from the settling pond It provides the effect that can achieve.

Description

Water treatment device using powdered iron oxide {APPARATUS FOR TREATING WASTE WATER USING IRON OXIDE POWDER}

The present invention relates to a water treatment apparatus using powdered iron oxide, and more particularly, to a water treatment apparatus using powdered iron oxide for treating sewage or wastewater using powdered iron oxide.

Recently, as the aggravation of water pollution in the water system continues and the limitations of available water resources are revealed, efforts are being made to secure water resources by improving the quality of the existing water system. As the standards are being strengthened step by step, the technology demand for a more efficient and reliable wastewater treatment system that can secure treatment stability is increasing.

In particular, it is very difficult to treat high-concentration organic wastewater from food processing plants to a level that meets the strengthened water quality standards, and since its incomplete treatment has a relatively large effect on the deterioration of water quality, it can be efficiently treated. There is an urgent need to develop such a system.

In order to treat such high-concentration organic wastewater, the domestically applied methods are largely an aerobic treatment method and anaerobic digestion. Mainly used

However, looking at the characteristics of the aerobic treatment methods described above, in the case of the continuous batch reactor, process management is convenient and has strong advantages in water quality and flow rate fluctuations. has the disadvantage that it is difficult to apply to facilities of It has a limitation in that it is difficult to apply to wastewater of

In the biological treatment technology, which is a representative treatment technology for organic substances and nutrients contained in sewage and wastewater, which is widely used at home and abroad, the treatment efficiency is determined by the amount of microorganisms maintained and managed in the bioreactor tank. High-integration technology including MBR (Membrane Bio-Reactor) technology for maintaining high concentration of microorganisms is being made in the direction of major technology development.

However, the high integration technology of the amount of microorganisms including the MBR technology is accompanied by various problems such as an increase in the initial investment cost of the membrane, a decrease in the microbial activity in the sludge, and an increase in the aeration cost.

On the other hand, high-integration sewage and wastewater treatment technology using powdered iron oxide applied at home and abroad, takes into consideration the injection, recovery, and reuse of powdered iron oxide in sewage and wastewater treatment systems, from high-concentration and high-viscosity microbial flocs. There were problems such as the difficulty of solid-liquid separation and deterioration of treatment performance due to the generation of suspension.

Republic of Korea Patent Registration No. 10-0667225 (January 15, 2007) Republic of Korea Patent Registration No. 10-0930929 (December 10, 2009) Republic of Korea Patent Registration No. 10-1268502 (June 07, 2013)

The present invention has been devised to solve the above problems in the prior art, and by injecting powdered iron oxide to increase the contact between microbial floc and powdered iron oxide to primarily improve sedimentation, and to increase the amount of microorganisms in the sludge returned from the sedimentation basin Accordingly, an object of the present invention is to provide a water treatment device using powdered iron oxide that can achieve high integration and increase treatment efficiency in sewage and wastewater treatment systems.

In addition, the present invention enhances the digestion efficiency of the digester by accelerating the transfer and transfer reaction, which is the main mechanism of the microbial reduction reaction in the digester, and unlike the sludge with high viscosity on the sewage and wastewater treatment system, the sludge with low viscosity by digestion. Another object of the present invention is to provide a water treatment device using powdered iron oxide, which can be easily separated from the powdered iron oxide in the solid-liquid separation device at the rear stage and reused in sewage and wastewater treatment systems.

In addition, in the high-integration sewage treatment system, powdered iron oxide injected into the bioreactor improves sedimentation as a sedimentation aid to secure a large amount of microorganisms, thereby achieving high integration of the sludge treatment tank, and electron transfer reaction in the digester, which is a sludge treatment system at the rear end. Another object of the present invention is to provide a water treatment device using powdered iron oxide that can contribute to improving digestion efficiency by promoting

In addition, in the present invention, powdered iron oxide finally used in sludge treatment is separated into solid-liquid by a solid-liquid separation device and reused, so that high-efficiency treatment of the existing biological treatment system with the same treatment capacity is possible, making it easy to retrofit an existing sewage treatment plant. ) to provide a water treatment device using powder iron oxide that can provide another object.

In addition, the present invention provides a water treatment device using powdered iron oxide that can solve the problems of increase in initial investment cost for maintaining high concentration of microorganisms in the bioreactor, the problem of lowering of biological activity, and the problems of recovery and reuse accompanied by sedimentation aid. It serves another purpose to provide.

The present invention for achieving the above object is a water treatment apparatus for treating sewage or wastewater using powdered iron oxide, comprising: a water treatment unit for water treatment by inputting powdered iron oxide; and a sludge treatment unit installed downstream of the water treatment unit to treat the sludge generated in the water treatment unit and recover the powdered iron oxide contained in the sludge for reuse in the water treatment unit.

The water treatment unit of the present invention, the anaerobic tank 10 for biologically denitrifying sewage or wastewater for water treatment; an aerobic tank 20 installed downstream of the anoxic tank 10 to remove organic matter and nitrify; a settling tank 30 installed downstream of the aerobic tank 20 to precipitate and separate sludge after water treatment; And it is connected to the aerobic tank 20, the input unit 40 for introducing powdered iron oxide into the aerobic tank 20; characterized in that it comprises a.

The sludge treatment unit of the present invention includes: a digester 50 connected downstream of the water treatment unit to digest and treat the sludge discharged from the water treatment unit; a dehydrator 60 connected downstream of the digester 50 to dewater the digested sludge; and a solid-liquid separation unit 70 installed between the digester 50 and the dehydrator 60 to separate the sludge into solid-liquid and recover the powdered iron oxide contained in the sludge.

The input unit 40 is installed in a pair on the upper side of the aerobic tank 20, it is preferable to put the iron oxide.

The input unit 40 includes a main body 41 formed on the upper side of the exhalation tank 20; It is preferable to include; the injection pipe 42 coupled to protrude downward from the lower surface of the main body 41 .

As described above, the present invention improves the sedimentation property primarily by increasing the contact between the microbial floc and the powdered iron oxide by injecting powdered iron oxide, and according to the increase in the amount of microorganisms in the sludge returned from the settling pond, it is used in sewage and wastewater treatment systems. It provides the effect of achieving high integration and processing efficiency increase.

In addition, it enhances the digestion efficiency of the digester by promoting the transfer and transfer reaction, which is the main mechanism of the microbial reduction reaction within the digester. It is easily separated from the solid-liquid separation device at the rear stage to provide the effect that it can be reused in sewage and wastewater treatment systems.

In addition, in the high-integration sewage treatment system, powdered iron oxide injected into the bioreactor improves sedimentation property as a sedimentation aid and secures a large amount of microorganisms to achieve high integration of the sludge treatment tank. It provides an effect that can contribute to improving digestion efficiency.

In addition, the powdered iron oxide finally used in the sludge treatment is separated into solid-liquid by a solid-liquid separation device and reused, so that high-efficiency treatment of the existing biological treatment system with the same treatment capacity is possible, providing easy retrofit of the existing sewage treatment plant. It provides a possible effect.

In addition, it provides the effect of solving the problems of the increase of the initial investment cost for maintaining the high concentration of microorganisms in the bioreactor, the decrease of biological activity, and the problems of recovery and reuse accompanied by the sedimentation aid.

1 is a block diagram showing a water treatment apparatus using powdered iron oxide according to an embodiment of the present invention.
Figure 2 is a perspective view of the input unit coupled to the exhalation tank according to an embodiment of the present invention;
3 is a perspective view of an input unit according to an embodiment of the present invention;

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

1 is a block diagram showing a water treatment apparatus using powdered iron oxide according to an embodiment of the present invention.

As shown in Fig. 1, the water treatment apparatus using powdered iron oxide according to this embodiment includes a water treatment unit and a sludge treatment unit. It is a water treatment device that highly intensively treats sewage or wastewater using powdered iron oxide.

The water treatment unit is a water treatment means for water treatment by injecting powdered iron oxide into a bioreactor of sewage or wastewater, and includes an anoxic tank 10 , an aerobic tank 20 , a settling tank 30 , and an input unit 40 .

The anoxic tank 10 is a treatment means for biologically denitrifying sewage or wastewater to treat water, such as nitrite nitrogen (NO2-N) or nitrate nitrogen (NO3-N) in an anoxic state with little dissolved oxygen The nitrogen (N) component contained in the inorganic nitrogen is reduced to nitrogen gas (N2) using denitrifying microorganisms and released into the water.

In such anoxic tanks, biological nitrogen removal in sewage and wastewater treatment systems is performed for the purpose of water conservation and erosion prevention. Biological nitrogen removal is performed through a series of nitrification and denitrification processes.

Specifically, organic nitrogen compounds are converted into ammonia form by biological decomposition, ammonia nitrogen is oxidized to nitrate nitrogen through nitrification, and nitrate nitrogen is removed by reduction to nitrogen gas by denitrification process.

In addition, this denitrification process is generally performed in an anoxic tank. In this anoxic tank, the residence time of the influent is about 3 hr, and in order to increase the denitrification efficiency, an internal recycle ratio of 200 to 400% with the nitrification tank (aeration tank) It is preferable to circulate the influent to the furnace.

The aerobic tank 20 is installed downstream of the anoxic tank 10 and is a treatment means for removing organic matter and nitrifying, and agitation by aeration is actively performed in the bioreactor of the sewage and wastewater treatment system.

In the aerobic tank 20, a carrier to which aerobic bacteria is attached is installed, but it is not easy to replace, and there is a fear that sewage that has not been sufficiently removed to contaminants may be discharged due to separation of the installed carrier, etc. It is possible to remove contaminants such as etc., and an aerobic tank that can be easily fixed and separated is used.

In particular, during the biological water treatment process of sewage and wastewater, the primary treated water treated in the first settling tank flows into the aerobic tank 20 and activates aerobic microorganisms to remove colloidal and soluble organics contained in sewage and wastewater to remove organic pollutants. disassemble and remove.

In addition, the aerobic tank is an important process that determines whether the secondary treatment is appropriate among the water treatment unit processes by the standard activated sludge method.

The input unit 40 is installed in a pair on the upper side of the aerobic tank 20, and specifically for inputting iron oxide, the input unit 40 includes a body part 41 formed on the upper side of the aerobic tank 20; It includes;

In particular, in the maintenance and management of the aerobic tank, sufficient oxygen supply to properly maintain dissolved oxygen (DO) and aeration function for uniform mixing of sewage are most important to promote the purification function of activated sludge by activating microorganisms will do

In addition, the reason for injecting air into the aerobic tank is to supply oxygen to the aerobic microorganisms to facilitate activities such as oxidation and adsorption. This is to prevent sedimentation of activated sludge with the effect of mixing the mixed solution.

The settling tank 30 is installed downstream of the aerobic tank 20 and is a settling means for precipitating and separating the sludge after water treatment. It is an essential facility for the purification and treatment of sewage and wastewater discharged from

In the settling tank 30 of this water treatment, a device for collecting sedimented sludge, that is, semi-liquid semi-solid sludge, is installed at the bottom of the water tank. It operates by pushing the sludge settling into the settling tank to either the starting point or the end point on the end of the settling tank, and the sludge collected in this way is discharged to the outside of the settling tank through a suction pipe or a discharge pipe.

Of course, the sludge collecting device for the water treatment settling tank may have a structure in which a wire or chain circulating on the longitudinal cross-section of the settling tank is built, and a plate body for sludge transfer is mounted to these circulation wires or chains.

The input unit 40 is connected to the upstream of the aerobic tank 20 and is an input means for inputting powdered iron oxide into the aerobic tank 20, and powdered iron oxide such as magnetite is introduced into the aerobic tank 20 as a sedimentation aid. .

The sludge treatment unit is installed downstream of the water treatment unit to treat the sludge generated in the water treatment unit and recover the powdered iron oxide contained in the sludge for reuse in the water treatment unit. It consists of a part (70).

The digester 50 is connected to the downstream of the water treatment unit and is a treatment means for digesting and treating the sludge discharged from the water treatment unit. The sludge is biologically degraded by anaerobic microorganisms present in the sludge.

In addition, the digester 50 is, for example, a sewage treatment plant, landfill leachate, living manure, food waste, livestock manure, purified water treatment plant concentrated sludge, alcohol distillation waste liquid or yeast manufacturing waste liquid, slaughter treatment waste and other organic matter biological treatment system Biomass contained in wastewater is decomposed into carbon dioxide or methane by anaerobic microorganisms.

When the sludge in the wastewater being treated in the digester rises to the surface over time and hardens on the surface, it forms a thick scum layer. will decrease the efficiency of

And when a separate air or liquid is injected from the outside of the digester to remove or pulverize the scum, the anaerobic reaction atmosphere in the digester cannot be maintained, so that the treatment efficiency by anaerobic microorganisms is reduced.

The dehydrator 60 is connected to the downstream side of the digester 50 and is used as a treatment means for dewatering the digested sludge, and is used in the dehydration process for separating the moisture contained in the sludge.

Here, as the dewatering process of sludge, a filter cloth dewatering method in which the sludge is filtered by pressing with a filter such as a filter cloth or an electroosmotic dewatering method in which an active force is applied to dewater by a voltage difference is used.

In addition, it is of course possible to extract the sludge by injecting it into a centrifugal dehydrator so that the sludge generated in the water and wastewater treatment process or the process of treating livestock wastewater can be concentrated and dehydrated by physical centrifugal force.

In this centrifugal dehydrator, the injected sludge is extracted according to the operation of the screw conveyor. In the case of a centrifugal separator, water and solid matter contained in the sludge is injected into a rotating outer bowl, and centrifugal force is applied with a small power to obtain water and solid matter. this is separated

The solid-liquid separation unit 70 is installed between the digester 50 and the dehydrator 60 to separate the sludge into solid-liquid into solid and liquid, and to recover powdered iron oxide contained in the sludge. Various industrial wastewater and sewage, And since pig manure contains solids such as sludge, the purification process cannot be performed properly without separating and removing these solids. iron oxide is recovered.

Therefore, the water treatment device of the present invention is a device related to the high integration of the amount of microorganisms in the bioreactor, which is the direction of biological sewage and wastewater treatment technology, and is a sedimentation aid in the aerobic tank in which aeration is actively performed in the bioreactor of the sewage and wastewater treatment system. By injecting powdered iron oxide through the injection part of phosphorus powdered iron oxide, the contact between microbial flocs and powdered iron oxide is increased to improve sedimentation primarily, and as the amount of microorganisms in the sludge returned from the settling pond increases, it is used in sewage and wastewater treatment systems. high integration and processing efficiency increase.

In addition, the powdered iron oxide contained in the waste sludge promotes the transfer and transfer reaction, which is the main mechanism of the microbial reduction reaction, in the digester, which is a secondary sludge treatment system, thereby increasing the digestion efficiency of the digester, and sludge with high viscosity in the sewage and wastewater treatment system. In contrast to this, powder iron oxide contained in sludge with low viscosity by digestion is easily separated in a solid-liquid separation device at the rear stage and reused in sewage and wastewater treatment systems, including powder iron oxide circulation.

The highly integrated sewage and wastewater treatment system including the above unit operation is a single sewage and wastewater treatment system in which a system including a sludge treatment system for large sewage and wastewater treatment plants and a downstream sludge treatment system for small and medium-sized sewage and wastewater treatment plants are deleted. system will be included.

As described above, in the case of a single sewage and wastewater treatment system in which the sludge treatment system at the rear stage is deleted, improvement in sludge dewatering performance including centrifugal dehydration is achieved according to the decrease in water content in the waste sludge.

In addition, the present invention was devised to solve the problems of the conventional high-density technology such as MBR, and in order to prevent the installation of an additional aeration device in sewage and wastewater treatment systems, powder iron oxide in an aeration tank or aerobic tank in an existing biological reaction tank High recovery rate operation is possible by considering the injection device of , resulting in energy savings.

As described above, according to the present invention, by injecting powdered iron oxide to increase the contact between microbial floc and powdered iron oxide, the sedimentation property is primarily improved, and according to the increase in the amount of microorganisms in the sludge returned from the settling pond, it is used in sewage and wastewater treatment systems. It provides the effect of achieving high integration and processing efficiency increase.

In addition, it enhances the digestion efficiency of the digester by promoting the transfer and transfer reaction, which is the main mechanism of the microbial reduction reaction within the digester. It is easily separated from the solid-liquid separation device at the rear stage to provide the effect that it can be reused in sewage and wastewater treatment systems.

In addition, in the high-integration sewage treatment system, powdered iron oxide injected into the bioreactor improves sedimentation property as a sedimentation aid and secures a large amount of microorganisms to achieve high integration of the sludge treatment tank. It provides an effect that can contribute to improving digestion efficiency.

In addition, the powdered iron oxide finally used in the sludge treatment is separated into solid-liquid by a solid-liquid separation device and reused, so that high-efficiency treatment of the existing biological treatment system with the same treatment capacity is possible, providing easy retrofit of the existing sewage treatment plant. It provides a possible effect.

In addition, it provides the effect of solving the problems of the increase of the initial investment cost for maintaining the high concentration of microorganisms in the bioreactor, the decrease of biological activity, and the problems of recovery and reuse accompanied by the sedimentation aid.

The present invention described above can be embodied in various other forms without departing from the technical spirit or main characteristics thereof. Accordingly, the above embodiments are merely examples in all respects and should not be construed as limiting.

10: anaerobic tank 20: aerobic tank
30: sedimentation tank 40: input unit
50: digester 60: dehydrator
70: solid-liquid separation unit

Claims (3)

As a water treatment device for treating sewage or wastewater using powdered iron oxide,
a water treatment unit for water treatment by adding stagnant powdered iron oxide to the iron by-products; and
A sludge treatment unit installed downstream of the water treatment unit to treat the sludge generated in the water treatment unit and to recover the powdered iron oxide contained in the sludge for reuse in the water treatment unit;
The water treatment unit,
anoxic tank 10 for biologically denitrifying sewage or wastewater to treat water;
an aerobic tank 20 installed downstream of the anoxic tank 10 to remove organic matter and nitrify;
a settling tank 30 installed downstream of the aerobic tank 20 to precipitate and separate sludge after water treatment; and
and an input unit 40 connected to the aerobic tank 20 to inject powdered iron oxide into the aerobic tank 20;
The sludge treatment unit,
a digester 50 connected to the downstream of the water treatment unit to digest and treat the sludge discharged from the water treatment unit;
a dehydrator 60 connected downstream of the digester 50 to dewater the digested sludge; and
Water treatment using powder iron oxide comprising a; a solid-liquid separation unit 70 installed between the digester 50 and the dehydrator 60 to separate the sludge into solid-liquid and recover the powdered iron oxide contained in the sludge Device. According to claim 1,
The input unit 40 is installed in a pair on the upper side of the aerobic tank 20, and a water treatment apparatus using powdered iron oxide, characterized in that the iron oxide is introduced. 3. The method of claim 2,
The input unit 40 is
The body portion 41 formed on the upper side of the exhalation tank 20;
The water treatment apparatus using powder iron oxide comprising a; a spray pipe (42) coupled to protrude downward from the lower surface of the main body (41).

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