KR20090008839A - Apparatus for treatment of bank filtered water include nitrate nitrogen - Google Patents

Abstract

A processing unit of bank-filtered water including nitrate nitrogen is provided to remove completely nitrate nitrogen, iron, manganese, taste, odor cause matter and bacteria in the bank-filtered water and to improve quality of tap water. A nitrate nitrogen is removed in a denitrification filter pond(4) by dissolving hydrogen generated in an electrolysis device(12) into bank-filtered water transferred from an intake pump set up in a radial shaped inlet well. A part of oxygen generated in the electrolysis device is supplied to an aeration reaction bath(6). Iron and manganese are removed by a biological reaction and a physical screen filtering reaction of microorganisms in a biofilter(7). Harmful materials including residual organic matters are absorbed and disassembled in biological filtering pond.

Description

Apparatus for treatment of bank filtered water include nitrate nitrogen.

The present invention relates to an apparatus for treating riverside filtered water, and more particularly, to an apparatus for treating riverside filtered water including nitrate nitrogen using hydrogen and oxygen generated in an electrolysis device.

The present invention relates to a water treatment technology for riverside filtrate water purification plant, and more particularly, to a water purification technology for riverside filtrate water containing nitrate nitrogen, and relates to an improvement of the patent application No. 10-2007-0066544 (2007.07.03) of the company. .

Conventional tap water was mainly used as tap water by performing physical and chemical treatments in a water purification plant using raw water such as rivers, rivers, lakes and dams as raw water.

However, as environmental pollution progresses, the water quality of raw water also tends to deteriorate, and although many investments are made, such as advanced treatment, the reality is that the people still have low confidence in tap water.

In addition, the consumption of tap water is increased due to industrial development and improvement of living standards.In some local cities, it is difficult to secure water supply because there are no large reservoirs or rivers where water is easily secured. As demand continues, riverside filtration plants are on the rise.

River water filtered water has a constant water temperature compared to surface water, nitrification occurs due to microbial action, so there is little ammonia nitrogen, water fluctuations are small, and even when river water is contaminated, it is purified by microorganism decomposition and adsorption. Good.

On the other hand, raw water generally contains a large amount of iron and manganese, and the concentration of nitrate nitrogen is high in some regions.

The removal of iron and manganese is usually effective by oxidizing with chlorine or by manganese dioxide, and the reaction rate is fast, but the oxidation by chlorine may generate trihalomethane or its precursor, which is a carcinogen. Oxidation can be psychologically resistant in terms of increased treatment costs and the use of artificial chemicals, and methanol injection if there is a large amount of nitrate nitrogen, such as running water, but no organic material or other electron donors required for denitrification. In addition, microorganisms can be used to remove nitrogen, or sulfur denitrification and ion exchange denitrification. The former requires the injection of a large amount of expensive organic matter, such as expensive methanol. In case of sulfur denitrification, a large amount of sulfuric acid group (SO ₄ ^2- ) Since it remains, it is not suitable for tap water treatment, and the ion exchange denitrification method is difficult to apply due to the high cost of equipment, the problem of treating the ion exchange resin regeneration solution, and the excessive operation cost.

As a method of supplying hydrogen to the riverside filtrate containing a large amount of nitrate nitrogen, there is a method of dissolving hydrogen gas in water by using a fine bubble acid engine widely used for oxygen aeration, but this way most of the hydrogen gas supplied is air When released to the middle of the uneconomical, explosive hydrogen gas is released into the air there is a risk of explosion accidents, there was a problem that operation and maintenance is difficult.

Our prior application patent application No. 10-2007-0066544 (2007.07.03) solved this problem, but the utilization of oxygen was insufficient in the prior application patent.

It is an object of the present invention to provide an apparatus for treating riverside filtrate containing nitrate nitrogen, which produces economically and clean tap water by using hydrogen and oxygen generated in an electrolysis device in a whole water purification process.

According to the present invention, hydrogen generated from an electrolysis device and hydrogen in oxygen are dissolved in a hydrogen gas dissolving device to be used for denitrification, and some of the oxygen is supplied to the aeration reactor and some is supplied to the pure oxygen type ozone generator. Riverside containing nitrogen nitrate, iron and manganese, and nitrate nitrogen that effectively removes various odors and flavors in riverside filtration water by reuse of ozone generator in the whole water treatment process using generated hydrogen and oxygen. It is to provide a treatment apparatus for filtered water.

The present invention is economical by using all of the hydrogen and oxygen generated in the electrolysis device in the water purification process, and completely removes substances and bacteria that are nitrate nitrogen, iron, manganese, taste, and odor source in river water filtered water to remove the water quality of tap water. There is an effect to improve.

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

In the lower part of the radial water inlet 1, four to six horizontal water collecting pipes 1-1 are installed in an equal angle radially in the upper layer and the lower part of the radial water inlet 1 and in the center of the radial water inlet 1 (2) is installed, and the raw water of the riverside filtered water is pumped to the hydrogen gas dissolution tank (3).

In order to dissolve the raw water pumped into the hydrogen gas dissolution tank with a saturated liquid of hydrogen gas, a line mixer 3-4 is installed in the middle of the discharge side pipe of the circulation pump 3-3, and the gas compressor 3-1 The compressed hydrogen gas is supplied to the line mixer 3-4 through the control valve 3-8. When the signal of the transmission level controller 3-2 is HWL (high water level), the control valve 3-8 is opened. When the water is automatically opened and the LWL (low water level) is closed, the control valve 3-8 is automatically closed so that the raw water stays in the hydrogen gas dissolution tank 3 at a pressure of 1.5 kg / cm 2 for about 2 minutes. It becomes saturated hydrogen gas.

The internal pressure of the hydrogen gas dissolution tank 3 adjusts the opening degree of the pressure regulating valve 3-9 so as to be a predetermined pressure.

Hydrogen gas supplied to the hydrogen gas dissolution tank is generated by electrolyzing tap water in the electrolysis device 12, and compressed in the gas compressor 3-1, and then hydrogen gas dissolution tank through the line mixer 3-4. It is supplied to (3).

In the hydrogen gas dissolution tank 3, raw water in which hydrogen gas is saturated is transferred to the denitrification filter paper 4.

The denitrification filter paper 4 has an upflow form to facilitate the dissipation of nitrogen gas generated during denitrification. A filter block 4-3 is provided at the lower part of the denitrification filter paper 4, and a particle diameter of 0.5 to 2.0 mm is thereon. The granular filter material 4-1 is laid at a thickness of 1,000 to 2,000 mm, and an air water washing strainer 4-4 is inserted into the filtration block 4-3, and the lower portion of the filtration block 4-3 is installed. An air bed partition (4-5) was installed, and an ORP measuring instrument (4-2) was installed in the upper water.

When the denitrification filter paper 4 is maintained above ORP -350 mV and operated anaerobicly, denitrification bacteria adhere to and grow on the granular filter material 4-1, and denitrification bacteria denitrify using hydrogen gas in raw water as an electron donor. .

When the filtration rate of the raw water passing through the denitration filter paper 4 is 100 to 120 m / day, 95 to 99% of the nitrate nitrogen in the raw water is removed.

The raw water passing through the denitrification filter paper 4 is moved along the raw water inlet pipe 6-1, which is extended to a height of 6 to 8 m from the lower water surface of the aeration reactor 6 by a transfer pump 6-5. , Through the dispersion nozzle 6-3 installed downwardly in the distribution pipe 6-2 horizontally or lattice-shaped at the end of the raw water inlet pipe, diffused widely and dispersed in a drop shape to form an oxidation chamber 6-6. Fall inside.

Part of the oxygen generated in the electrolysis device 12 is supplied to the lower portion of the oxidation chamber 6-4 of the aeration reactor 6 through the oxygen gas supply pipe 13.

The aeration reactor (6) has a cylindrical tower shape, but forms an exhaust port (6-5) of an appropriate size on the top.

In this case, the aeration reactor 6 becomes an airtight container having an exhaust port in the upper center, so that if the oxygen is continuously supplied from the lower part of the aeration reactor 6, the oxidation chamber 6-4 of the aeration reactor is filled with oxygen, As the partial pressure of oxygen increases, oxygen is well dissolved in the droplets of raw water freely falling into the oxidation chamber, thereby increasing the oxygen utilization rate.

In the present invention, 110% of the amount of oxygen required in the aeration reaction tank is supplied for efficient use of oxygen so that the inside of the aeration reaction tank ^) is always filled with oxygen.

If the dissolved oxygen concentration is increased to 5.0 mg / L or more in the aeration reactor 6 and the residence time of the aeration reactor 6 is 20 to 30 minutes, some iron such as iron bicarbonate is oxidized in the aeration reactor 6, Some of the volatile substances such as taste, smell and causative substances are released into the atmosphere and removed.

In the aeration reactor 6, the raw water having completed the oxidation reaction and the aeration is transferred to the biological filter paper 7.

The biological filter paper 7 has a particle size of 1.0 to 3.0 mm, a filtration layer thickness of 1,500 to 2,500 mm, a filtration speed of 120 to 150 m / day, and an air-water combined washing device.

In the biological filter paper, iron bacteria adhere to the filter medium and multiply to oxidize iron and manganese in raw water, and the oxides are adsorbed by the iron bacteria to promote them. And oxidized manganese and suspended solids from the biological filter paper.

These removal substances are attached to the filtration layer of the biological filter paper 7 and then transferred to the effluent treatment tank 17 by washing.

The raw water that has passed through the biological filter paper 7 is in contact with ozone in the ozone reactor 8 to decompose various hardly decomposable substances and substances causing odor and taste.

The ozone reactor 8 is formed of a sealed reinforced concrete structure, and raw water flows into the inlet 8-1 to react with ozone, and then is transferred to the biological activated carbon filter paper 9 through the outlet 8-2. .

Ozone is injected into the ozone reactor 8 by using a highly efficient pure oxygen type ozone generator so that the ozone concentration is 10 to 12% O ₃ wt / O ₂ .

Conventionally, a large number of diffusers were used, but since the damage of the diffusers and the ozone dissolution rate are low, the ozone generating apparatus has become large and has not been used recently.

In the present invention, when oxygen is supplied to the pure oxygen-type ozone generator 40 to generate hydrogen in the electrolysis device 12, oxygen generated incidentally together is used so that a separate oxygen storage tank is not required.

Since the raw water of the ozone reactor 8 is almost at the level of saturated oxygen, 90% of the oxygen supplied with ozone is almost not dissolved and is discharged to the exhaust gas port of the ozone reactor 8. By recovering the oxygen in the drain water drain (8-3), and dried in the dryer 30 and reused in the ozone generator 40, the oxygen utilization rate was maximized.

In addition, the ozone injection concentration of the ozone reactor 8 of the water purification plant was relatively low as 1 to 3 mg / L, and the ozone solubility of water was 90 mg / L at 20 ° C., so that the outlet portion 8 of the ozone reactor 8 was used. -2) pumps the raw water into the circulation pump (60) and pumps it to the ozone dissolving tank (70). The ozone generated in the ozone generator (40) is supplied to the raw water through the ozone inhaler (50) and the ozone dissolving tank (70). Ozone is saturated in raw water for 2 to 3 minutes, and when ozone-saturated raw water is mixed with raw water in the mixer 110 and transferred to the ozone reactor 8, there is no ozone loss and the ozone concentration is 3 mg /. Is kept at L.

In this case, the capacity of the circulation pump 60 is very small as 3/90 = 3.4% of the amount of raw water of the riverside, ozone has a small Henry constant so that it can be dissolved in water, and the discharge pressure of the circulation pump can be operated at 10 m or less. In addition, the power required to dissolve ozone is also very small and economical.

When the raw water is kept in the ozone reaction tank 8 for 10 to 20 minutes, various trace organic substances that cause the taste and smell in the raw water are decomposed and removed, and bacteria such as E. coli are killed and removed.

The raw water passing through the ozone reactor 8 is transferred to the biological activated carbon filter paper 9.

The biological activated carbon filter paper 9 has a particle size of 1.0 to 2.0 mm, a filter layer thickness of 2,000 to 2500 mm, a filtration rate of 120 to 150 m / day, and an air-water combination washing method. And foreign substances in raw water are decomposed, adsorbed and removed by the action of microorganisms that adhere to the surface of activated carbon.

Raw water passed through the biological activated carbon filter paper (9) is chlorine disinfection in the disinfection tank (10),

The washing water generated in the denitrification filter paper 4, the biological filter paper 7, and the biological activated carbon filter paper 9 is separated into supernatant and sludge in the wastewater treatment tank 17, and the sludge is taken out and disposed of after dewatering in the dehydration apparatus 20. Effluent supernatant is transferred to the artificial reclaimed land 18 to infiltrate the riverside underground.

The washing water tank 5 is a place for storing the washing water for washing the denitrification filter paper 4, the biofilter paper 7, and the bioactive carbon filter paper 9.

An important point of the present invention will be described in detail as follows.

The process of dissolving hydrogen gas in water is shown in the following [Scheme 1].

[Scheme 1]

Wh = 2 × (f. P -1)

Where Wh: weight of hydrogen gas dissolved in water. mg / L

2: The hydrogen gas saturation concentration at 20 degreeC 1 atmosphere. mg / L

f: degree of saturation of gas at pressure P. 0.8 with agitation

P: Gauge operating pressure kg / ㎠.G + 1.013

In order to make the raw water into saturated hydrogen gas, the left side Wh of the reaction formula 1 is 2.0 mg / L of saturation concentration, f. P -1 = 1

f is 0.8 when stirring, so P = 2 / 0.8 = 2.5.

However, since P is the operating pressure + 1.013, the operating pressure is 2.5-1.013 = 1.49kg / ㎠ and converted to the head of 14.9m is about 15m.

Since the saturation degree f depends on the operating conditions such as the hydrogen gas dissolution tank type and the stirring type, the optimum operating pressure also changes accordingly, so the optimum operating pressure may be appropriately adjusted according to the operating conditions.

Saturated dissolution of hydrogen gas in the pressure tank as described above has no leakage of hydrogen gas to the outside or bubbles in the denitrification filter 4, and there is no risk of explosion due to the release of hydrogen gas. It is very efficient and economical by using whole quantity.

As described above, the raw water saturated with hydrogen gas is transferred to the denitrification filter paper 4 and passed through the granular filter material 4-1 of the denitrification filter paper 4, and is attached to the granular filter material, thereby nitrate-forming by biological activity. Remove nitrogen.

There are two microorganisms (bacteria) that remove nitrate nitrogen, one is heterotrophic and one is autotrophic.

Heterotrophic denitrification bacteria are bacteria that denitrify using organic matter in the anaerobic state, and autotrophic denitrification bacteria are bacteria that denitrify using inorganic elements such as sulfur (S) or hydrogen (H ₂ ) as electron donors. to be.

Since raw water has almost no organic matter, the heterotrophic denitrification bacteria are expensive because they require an artificial supply of more than three times the amount of nitrate nitrogen, such as methanol, so that it can affect water quality. It is not preferable to use.

Even when autotrophic denitrification bacteria are used, there is no electron donor necessary for denitrification in the raw water of the riverside filtrate, so denitrification is impossible.

Since autotrophic denitrification sulfur denitrification using sulfur as an electron donor of the bacterium is a filtration layer laid sulfur with the particulate filter material shaped raw water is only nitrate is removed by passing through, driving the sulfate groups is relatively easy, but a process water (SO ₃ ) Remains and the pH decreases, which is not suitable for the denitrification of tap water.

Excess sulphate in tap water can cause diarrhea and taste, so tap water is limited to less than 200mg / L.

In the present invention, a denitrification method using hydrogen gas (H ₂ ) as an electron donor having no effect on water quality was used.

The supply of hydrogen gas is generally cheaper because commercial gas produced by decomposing natural gas (CH ₄ ) is cheaper, but when using commercial hydrogen gas, the hydrogen gas is stored in a large storage tank. Due to the nature of the explosive hydrogen gas, the facility cost is expensive and safety management is very difficult.

In the present invention, the water is decomposed by the electrolysis device 12 to generate hydrogen gas and oxygen gas, so that the hydrogen gas is denitrified by using the denitrification filter paper 4 as an electron donor of autotrophic denitrification bacteria, and the oxygen gas is abandoned. It was used to supply oxygen to the reactor 6 and the pure oxygen ozone generator 40.

Hydrogen gas generation by the electrolysis device uses the generated hydrogen gas at the same time, so there is no separate high-pressure storage facility, so the facility is simple, high in safety, and easy to maintain.

Independent nutrient denitrification bacteria are widely distributed in the natural world, and their growth rate is fast, and if cultured for a certain period of time, they adhere to the granular filter material (4-1), and by denitrification, nitrate nitrogen in raw water is decomposed into nitrogen gas and released into the atmosphere. Remove

The reaction of denitrification using hydrogen gas of autotrophic denitrification bacteria is shown in the following [Scheme 2].

[Scheme 2]

^{_{NO 3 - + 2.82H 2 + 0.1387CO}} 2 + 2.82H + = 0.027813C 5 H 7 O 2 N + 0.486N 2 + 3.2228H 2 O

The weight ratio of nitrate nitrogen removed to hydrogen gas consumed in [Scheme 2] is 0.4 g H ₂ / g N, and the amount of sludge generated is 22.4% of the weight of nitrogen removed. 50% of the amount of sludge produced during autotrophic denitrification is very small.

In riverside filtrate, iron is mainly in the form of ferrous bicarbonate, and trace amounts of colloidal iron combined with humic acid are also present.

Ferrous bicarbonate is easily oxidized and precipitated by insoluble ferric hydroxide, and the reaction is shown in [Scheme 3].

Scheme 3

2 Fe (HCO ₃ ) ₂ + H ₂ O + 1/2 O ₂ = 2Fe (OH) ₃ + 4CO ₂

Since the atomic weight of iron is 55.85 and the atomic weight of oxygen is 16, Reaction 3 shows that the amount of oxygen to be supplied for the oxidation of iron is 16 / 111.7 = 14.32% of iron.

Manganese is not oxidized by aeration in neutral water, and it is not oxidized by soluble rails having a form other than iron bicarbonate or by aeration. Therefore, iron and manganese are made of iron bacteria. Oxide and manganese are oxidized and deposited on the surface or body of bacteria as insoluble iron, manganese compounds, and iron bacteria and water are separated and removed from the sand filter layer of the biological filter paper.

The reason for giving up in the aeration reactor 6 is to oxidize iron which is easy to oxidize as in [Scheme 3], and to supply sufficient oxygen in the raw water so that the iron bacteria can proliferate well in the biological filter paper 7.

As described above, the amount of hydrogen and oxygen required to remove nitrate nitrogen and iron manganese will be examined.

For example, the economics of denitrification using methanol and denitrification using hydrogen gas in a water treatment plant producing tap water using 10,000 ㎥ / day riverside filtered water are as follows.

If the iron concentration in raw water is 3.0 mg / L, the manganese concentration is 1.0 mg / L, and the nitrate nitrogen concentration to be removed is 5.0 mg / L, the amount of iron and manganese in raw water is 30 kg / day and 10 Kg /, respectively. The amount of nitrate nitrogen to be removed is 50 kg / day, and the amount of hydrogen gas required to remove nitrate nitrogen is 0.4 times the amount of nitrate nitrogen according to [Scheme 2], so the required amount of hydrogen gas is 20 kg / day.

Since hydrogen gas is dissolved in raw water at a saturated concentration and there is no waste of hydrogen gas, the amount of hydrogen gas to be supplied is 20 kg / day.

In the electrolysis, the ratio of hydrogen gas and oxygen gas is 1 molecule of oxygen gas and 1 molecule of oxygen gas, so the weight ratio is 1: 8.

The total amount of oxygen gas to maintain iron oxidation and dissolved oxygen concentration of raw water at 5.0 mg / L or more in the aeration reactor is as follows.

Since the amount of oxygen required for iron oxidation by aeration is 14.32% of the weight of iron, the amount of oxygen for iron weight of 30 kg / day is 4.3 kg / day, and the amount of oxygen required to raise the dissolved oxygen concentration of raw water to 5.0 mg / L is 50 kg / day. The total amount of oxygen required to feed the aeration reactor is 54.3 kg / day.

110% of the required amount of oxygen is supplied to the lower portion of the aeration tank through the oxygen supply pipe 13 in 160 kg / day generated in the electrolysis device 12.

Since the oxygen gas generated in the electrolysis device 12 is supplied to the oxidation chamber 6-4 through the oxygen gas supply pipe 13 and the amount of oxygen supplied is larger than the required amount, the inside of the oxidation chamber 6-4 is It is filled with oxygen gas.

The Henry's constant of oxygen is 4.01 × 10 ⁴ at 20 ° C, which is smaller than the Henry's constant of 6.64 × 10 ^4. Therefore, oxygen is absorbed more efficiently in raw water than in air, resulting in an efficient aeration reaction and a smaller size of the aeration reactor.

Since the power required to generate hydrogen gas is generally about 60 kwh per kg of hydrogen gas, the power required to generate 20 kg of hydrogen gas per day = 20 kg × 60 kwh / 24 h = 50 kw, and the power required to dissolve hydrogen gas is 26 kw (flow rate 10,000 ㎥ / day, the power of a 15 meter pump), the total power required for hydrogen gas generation is (50 + 26) x 24 = 1,824 k trillion, and the power ratio is 91,200 won / day when 50 won per kwh is applied.

In the case of denitrification using methanol, the amount of methanol is three times that of nitrate nitrogen, so the amount of methanol required is 50 × 3 = 150kg / day and the price of 1kg of methanol is 150 × 720 = 108,000 won / day.

Denitrification using hydrogen gas is cheaper than methanol, less sludge is generated, and denitrification using hydrogen gas is more excellent as denitrification of raw water to produce tap water, considering that the quality of raw water is not affected.

The riverside filtrate, including nitrate nitrogen, iron, and manganese, enters the lower portion of the upstream denitrification filter paper 4 and moves upwards through the granular filter medium, and in the electrolysis device 12, an appropriate amount of hydrogen gas is transferred to the hydrogen gas. When the mixture is mixed with the raw water in the dissolution tank 3 and supplied to the raw water inlet pipe at the lower part of the denitrification filter paper, the granular filter material of the denitrification filter paper 4 is evenly distributed from the lower part of the filter paper through an air water washing strainer. While passing through 4-1), the autotrophic denitrification bacteria attached to the granular filter material 4-1 of the denitrification filter paper decompose nitrate nitrogen using hydrogen gas as an electron donor. It is converted to nitrogen gas and removed as it is released into the atmosphere.

When autotrophic denitrifying bacteria denitrate, as in [Scheme 2], although the amount of sludge is very small, autotrophic denitrifying bacteria proliferates, adheres to the granular filter material, and its amount increases over time to block the filtration layer. Therefore, by periodically cleaning, to remove the excess nutrient denitrifying bacteria that have been excessively grown, and transported to the wastewater treatment tank 17 for treatment.

Since denitrification by autotrophic denitrification bacteria can in principle eliminate 100% of nitrate nitrogen without returning sludge, the nitrate nitrogen concentration in the treated raw water can be neglected only by passing through the denitrification filter (4). As low as it goes.

The raw water from which the nitrate nitrogen is removed from the denitrification filter paper 4 flows into the aeration reactor 6 and is injected into the oxidation chamber 6-4 from the dispersion nozzle 6-3 installed above the aeration reactor. Free fall in the shape, the oxygen gas generated in the electrolysis device 12 is supplied to the oxidation chamber 6-4 through the oxygen gas supply pipe 13 to increase the concentration of oxygen gas in the oxidation chamber, thereby The absorption of oxygen into the raw water occurs quickly, and the aeration reaction takes place effectively.

The raw water is kept in the aeration reaction tank 6 for 20 to 30 minutes, wherein the raw water is maintained at a dissolved oxygen concentration of 5 mg / L or more and a saturated concentration, and iron bicarbonate in the raw water is oxidized during the residence time. It becomes insoluble ferric hydroxide like [Scheme 3].

In addition to the oxidation of iron, the aeration reactor removes unpleasant odorous substances such as free carbonic acid removal, volatile organic chlorine compounds, and hydrogen sulfide.

In the aeration reactor 6, a part of iron is oxidized, odorous substances are removed, and raw water having a sufficient dissolved oxygen concentration is transferred to the biofilter paper 7 and flows downward from the top of the biofilter paper. 1) Iron and manganese in raw water that have not been partially oxidized due to the action of iron bacteria growing and adhering to it are oxidized, adsorbed into the living body of iron bacteria and sieve action of the granular filter media (7-1). The ferric hydroxide oxidized in the reactor is also suppressed by the filter layer of the granular filter medium and removed from the raw water.

In the biofilter 7, the iron and manganese are removed, and at the same time, other suspended solids in the raw water are also removed by the sieve of the filter layer.

The biological filter paper (7) is the iron bacteria in the filter layer of the granular filter medium (7-1) continues to proliferate over time to block the filter layer, so that the excessively attached iron bacteria on the filter layer by periodic air-water washing And iron oxide particles and other suspended matter, and the washing water is transferred to the wastewater treatment tank 17 for treatment.

The raw water passing through the biofilter paper 7 is transferred to the ozone reactor 8, where the hardly decomposable organic substances are decomposed by ozone, and then transferred to the next bioactive carbon filter paper 9, and the bioactive carbon filter paper 9 In uncontaminated harmful substances in raw water-for example taste. Odor-causing substances, synthetic detergents, phenols, trihalo methane and its precursors, volatile organic compounds and trace harmful substances such as pesticides are removed by the adsorption of activated carbon and the action of microorganisms that attach and proliferate on activated carbon.

Since the ozone injection concentration of the ozone reactor 8 is about 3 mg / L, the amount of ozone required per day is 30 kg / day, and in the pure oxygen ozone generator, the ratio of ozone is 10% of the amount of oxygen supplied, which is necessary for the ozone generator 40. The amount of oxygen is 300 kg / day.

However, the oxygen supplied to the ozone reactor 8 with ozone is not dissolved but is released to the doubled water, and assuming that the amount of released oxygen is 70% of the amount of oxygen supplied, the oxygen discharged to the exhaust gas outlet is recovered and returned to the ozone generator. When reused, the actual oxygen required is 100 kg / day.

If the amount of oxygen supplied to the aeration tank is subtracted from the oxygen generation amount of 160 kg / day of the electrolysis device 12, the amount of oxygen remaining is 100 kg / day, which is the same as the amount of oxygen actually needed, so the pure oxygen ozone generator is generated from the electrolysis device. Ozone can be generated by oxygen alone, so there is no need for a separate oxygen purchase or storage facility.

Since the price of commercial oxygen is 400 won / kg, the price of oxygen reused in the ozone generator is 40,000 won / day.

If the oxygen of doubled water is not reused, the amount of oxygen required for ozone generation is 300kg / day, so the price of oxygen is 120,000 won / day.

The cost required for denitrification using methanol and the pure oxygen type ozone generator purchased outside is 228,000 won / day, and the cost required for the pure oxygen type ozone generator that reuses oxygen from the hydrogen gas using denitrification and exhaust gas of the present invention is 131,200 won / day. It is inexpensive and considerably economical considering the need for oxygen gas storage facilities.

The ozone reactor 8 can be omitted if the quality of the raw water is good. If the ozone reactor is installed, the bioactive carbon filter paper 9 is a biological activated carbon in which the decomposition of microorganisms attached to the media and the adsorption of activated carbon are performed in parallel. When the ozone reactor is omitted, it acts as an activated carbon adsorption filter paper mainly using adsorption of activated carbon.

The raw water that has passed through the biological activated carbon filter paper 9 is disinfected in the disinfection tank 10 and then transferred to the purified water 11 after storage, and water is supplied to the home.

The biological activated carbon filter paper (9) is a microorganism continues to multiply in the activated carbon particles as time passes, clogging the filter layer by periodically cleaning the air-water combined to remove excess adhered microorganisms and other suspended solids and , The washing water is transferred to the wastewater treatment tank 17 for treatment.

The washing water generated in the denitrification filter paper 4, the biological filter paper 7, and the biological activated carbon filter paper 9 is gravity precipitated in the wastewater treatment tank 17, and the sludge is transferred to the sludge storage tank 19, and the dewatering apparatus 20 Dehydrate and dispose in

The supernatant of the wastewater treatment tank is transported to the artificial reclaimed land 18 to infiltrate underground.

If the dissolved oxygen concentration in the raw water of the riverside filtrate is high, denitrification bacteria cannot actively act due to the inhibition of dissolved oxygen in the denitrification filter paper (4). In this case, methanol is mixed with hydrogen gas in the line mixer (3-4). By injecting the appropriate amount, normal denitrification can be achieved (not shown).

Detailed Description of the Invention The present invention has a side biased with respect to embodiments of a specific structure by the detailed description by way of the drawings, and those skilled in the art can make infinite modifications such as changing the size or thickness of the filter medium without departing from the spirit of the present invention. Or modifications will be possible, and all such modifications and variations should be construed as being included in the protection scope of the present invention.

1 is a block diagram showing a process relationship of the present invention.

2 is a cross-sectional view of a horizontal radial water well.

3 is a configuration diagram of a hydrogen gas dissolving device.

4 is a block diagram of denitrification filter paper.

5 is a cross-sectional view of the aeration reactor.

6 is a cross-sectional view of a biological filter paper.

7 is a block diagram of an ozone reactor.

8 is a configuration diagram of an ozone generator.

<Description of the code | symbol about the principal part of drawing>

1. Horizontal Radial Water Well 1-1. Horizontal collecting pipe 1-2. valve

2. Intake pump

3. Hydrogen gas dissolution tank 3-1. Gas Compressor 3-2. Transmission level controller

3-3. Circulation pump 3-4. Line Mixer 3-5. Safety valve

3-6. Injection Plate 3-7. Pressure gauge 3-8. Control valve

3-9. Pressure regulating valve

4. Denitrification filter paper 4-1. Granular Filtrate 4-2. ORP measuring instrument

4-3. Filtration Block 4-4. Strainers for Air and Water Washing

4-5. Air layer bulkhead 4-6. Aftermath Trough

5. Wash bath

6. Aeration reactor 6-1. Raw Water Inlet Pipe 6-2. Distribution pipe

6-3. Dispersion Nozzle 6-4. Oxidation chamber 6-5.

6-6. Raw Water Outflow Pipe 6-7. Transfer pump

7. Bio filter paper 7-1. Granular Filtrate 7-2. Filtration trough

7-3. Water and Air Bottle Washing Strainers

8. Ozone Reactor 8-1.Inlet 8-2. Outlet

8-3. Ship gas sphere

9. Biological Activated Carbon Filter Paper

10. Disinfectant

11. Water purification

12. Electrolysis device

13. Oxygen gas supply pipe

14. Denitrification filter paper washing water

15. Biofilter Washing Water

16. Biological activated carbon filter paper washing water

17. Effluent treatment tank

18. Artificial Reclaimed Land 18-1. Sand Gravel 18-2. Slope

18-3. Effluent supernatant inlet pipe

19. Sludge Reservoir

20. Dewatering device

30. Dryer

40. Ozone Generator

50. Ozone Inhaler

60. Circulation pump

70. Ozone Dissolution Tank

80. Ozone Flow Meter

90. Flow control valve

100. Pressure regulating valve

110. Mixer

Claims (1)

In the lower part of the radial water inlet 1, four to six horizontal water collecting pipes 1-1 are installed in an equal angle radially in the upper layer and the lower part of the radial water inlet 1 and in the center of the radial water inlet 1 (2) is installed to feed raw water into the hydrogen gas dissolution tank 3; In order to dissolve the hydrogen gas, a line mixer 3-4 is installed in the middle of the discharge side pipe of the circulation pump 3-3, and the control valve 3-8 is connected to the hydrogen gas compressed by the gas compressor 3-1. To the line mixer 3-4, and when the signal of the transmission level controller 3-2 is HWL (high water level), the control valve 3-8 is automatically opened, and when it is LWL (low water level), the control valve ( 3-8) is automatically closed, the pressure inside the hydrogen gas dissolving tank 3 is controlled by a pressure regulating valve 3-9, and the residence time is 2 minutes or more to make the raw water saturated with hydrogen gas. ; The raw water having passed through the hydrogen gas dissolution tank 3 is transferred to the denitrification filter paper 4, and the denitrification filter paper 4 is an upflow type, and the filter block 4-3 is installed at the lower part thereof, and the particle size is 0.5 thereon. A granular filter material 4-1 of ˜2.0 mm is laid at a thickness of 1,000 to 2,000 mm, and an air water washing strainer 4-4 is inserted into the filtration block 4-3, and the filtration block 4 is installed. In the lower part of 3), an air layer bulkhead 4-5 is installed, and an ORP measuring instrument 4-2 is installed in the upper water, it is kept anaerobic, denitrification bacteria adhere to the granular filter material 4-1, Denitrification bacteria denitrify using hydrogen gas in raw water; The filtration speed of the raw water passing through the denitrification filter paper 4 is 100 to 120 m / day; The raw water passing through the denitrification filter paper 4 is moved along the raw water inlet pipe 6-1, which is extended to a height of 6 to 8 m from the lower water surface of the aeration reactor 6 by a transfer pump 6-7. , Through the dispersion nozzle 6-3 installed downward in the distribution pipe 6-2 installed horizontally or lattice horizontally at the end of the raw water inlet pipe and dispersed in a drop shape to form an oxidation chamber 6-6. By falling inside, contacting with oxygen and simultaneously colliding with the lower surface of the water, bubbles are generated and oxygen gas is supplied to the raw water, thereby causing the oxidation reaction of iron, and simultaneously increasing the dissolved oxygen concentration of the raw water to 5.0 mg / L or more. The residence time of the aeration reactor 6 is 20 to 30 minutes; Hydrogen gas of hydrogen and oxygen generated in the electrolysis device 12 is supplied to the line mixer 3-4 through a gas compressor 3-1, and a part of oxygen is given up through the oxygen gas supply pipe 13 Supplied to the lower part of the oxidation chamber 6-4 of the reactor 6, and the remaining oxygen is supplied to the pure oxygen ozone generator 40; The raw water after the oxidation reaction and the aeration in the aeration reactor (6) has a median particle size of 1.0 to 3.0 mm, a filtration layer thickness of 1,500 to 2,500 mm, a filtration rate of 120 to 150 m / day, and an air-water combined washable biological filter paper (7) Filtration and oxidation of microorganisms to remove iron, manganese and suspended solids; Raw water passing through the biological filter paper 7 is in contact with ozone in the ozone reaction tank 8 to decompose various hardly decomposable substances and substances causing odor and taste; The ozone generator 40 is a pure oxygen ozone generator, and supplies necessary oxygen to oxygen of an electrolysis device and oxygen recovered from an exhaust gas outlet, and provides a circulation pump 60, an ozone inhaler 50, and an ozone dissolving tank 70. Using ozone saturated water to supply to the ozone reactor (8); Raw water passed through the ozone reactor 8 has a median particle size of 1.0 to 2.0 mm, a filtration layer thickness of 2,000 to 2,500 mm, a filtration rate of 120 to 150 m / day, and a foreign activated carbon filter paper (9) of washing with air-water. Decomposed and adsorbed and removed; Raw water passing through the biological activated carbon filter paper 9 is chlorine sterilized in the disinfection tank 10; Washing water generated in the denitrification filter paper 4, the biological filter paper 7, and the biological activated carbon filter paper 9 is separated into the supernatant and the sludge in the wastewater treatment tank 17, and the sludge is taken out after being dehydrated in the dehydration apparatus 20; And Effluent supernatant is transported to the artificial reclaimed land 18 to infiltrate the riverside underground, the device for treating riverside filtrate containing nitrate nitrogen

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