CN1693237A

CN1693237A - High oxidizing filtering system

Info

Publication number: CN1693237A
Application number: CN 200410060141
Authority: CN
Inventors: 崔秀敏
Original assignee: SHOUXIN ENVIRONMENT ENGINEERING Co Ltd JILIN
Current assignee: SHOUXIN ENVIRONMENT ENGINEERING Co Ltd JILIN
Priority date: 2004-05-09
Filing date: 2004-07-02
Publication date: 2005-11-09

Abstract

High oxidizing filtering system includes: high oxidizing mixing tank, high oxidizing contacting reaction pitcher, filtering pump, diatomite film filtering tank. The characteristics is that the outlet of the high oxidizing contacting reaction pitcher connects to the inlet of the filtering pump, the outlet of the filtering pump connects to the inlet of the diatomite film filtering tank, the high oxidizing mixed tank connects to the bottom of the high oxidizing contacting reaction pitcher. There are eddy current pump, ozone generator, hydrogen peroxide injection box on the bottom of the oxidizing mixed tank. There are gasholder, diatomite box, diatomite mixing box inner the diatomite film filtering tank. The beneficial effect of this invention is that high oxidizing and diatomite film combine with each other, oxidizing and filtering go along simultaneous, reducing the SS CODcr BOD of the original water as well as flavor, decolorizing, decreasing turbidity, sterilization, the wastewater according to the sullage emission standard can be reused after treatment, the river water pond water as well as ground water can reach drinking water standard after treatment.

Description

High oxidation filtration system

Technical Field

The invention relates to the technical field of advanced wastewater treatment aiming at recycling, in particular to a system which can highly oxidize organic matters in wastewater and has higher filtering precision.

Background

The environmental protection work is a basic national policy in China, with the rapid development of economy, the ecological environment is protected while the industrialization is realized, and the environmental protection work of restoring the blue sky blue water is paid great attention by all levels of governments.

At present, the chemical oxidation method is receiving more and more extensive attention in the wastewater treatment, and the technology can transform harmful organic matters into harmless compounds such as water, carbon dioxide, inorganic salt and the like, and completely realize the complete removal and harmlessness of pollutants in water.

Oxychlorination is the earliest chemical oxidation process for water treatment for human application. The method is widely applied to water supply, swimming pool circulating water and various waste water treatments. However, the use of chlorine is limited because chlorine has little or no effect on the decomposition of many contaminants in water (such as heavy metal ions, organic solvents, etc.), and incomplete oxidation may also result in the formation of certain trihalomethanes and the like.

Ozone has been widely used in wastewater treatment in recent years because of its strong oxidizing power. However, due to the poor degradability of certain contaminants or the formation of products that cannot be further oxidized, new chemical oxidation treatments are needed to replace conventional oxidation.

Disclosure of Invention

In order to overcome the defects of the oxidation treatment process, a high-degree oxidation method of ozone and an enzyme promoter-hydrogen peroxide is combined with a jet back-flushing type spring diatomite membrane filter developed by our company to develop and design reclaimed water recycling equipment, which is greatly helpful for saving national funds and water sources

The technical scheme adopted by the invention for solving the technical problem comprises the following steps: a high oxidation mixing tank, a high oxidation contact reaction tank, a filter pump and a diatomite membrane filter tank. The device is characterized in that a water outlet of the high oxidation contact reaction tank is connected with a water inlet of a filter pump, and a water outlet of the filter pump is connected with a water inlet of a diatomite membrane filter tank; the high oxidation mixing tank is communicated with the bottom of the high oxidation contact reaction tank, and the lower part of the high oxidation mixing tank is provided with a vortex pump, an ozone generator and a hydrogen peroxide injection box; the diatomite membrane filtering tank is provided with an air storage tank, a diatomite box and a diatomite mixing box.

In this system, the high oxidation is achieved by using a special catalyst having a strong oxidizing propertyIon-hydroxide (OH)^-The oxidation treatment of pollutants, organic matters and toxic substances in water is a water treatment technology which is more advanced than before. The latest water treatment process uses ozone (O)₃) In addition, hydrogen ion (H)^-Or increasing hydrogen peroxide (H)₂O₂) Or ultraviolet rays and the like, has stronger oxidizing property than the prior oxidizing agents of chlorine, chlorine dioxide and potassium permanganate, and has higher economic benefit in water treatment than the method of singly using ozone.

While drinking water such as tap water is secondarily contaminated when it is treated with chemicals, the high oxidation treatment using ozone and hydrogen peroxide finally oxidizes and decomposes various toxic and hardly decomposable organic substances in water into CO₂And H₂O, so that secondary pollution does not occur.

The reaction of ozone and hydrogen peroxide produces hydroxyl radicals (OH)^-The process of (2) is as follows:

the high-degree oxidation technology is that the refractory organic compound such as benzene and phenol is composed of (OH)^-To decomposition and oxidation.

The oxidation of organic matter can be divided into two ways:

the direct mode comprises the following steps: is treated by ozone (O)₃) The way the molecules are directly decomposed.

Indirect mode: quilt hydroxyl (OH)^-The way of decomposition.

When the pollutants strongly reacting with ozone molecules are abundant in the water treatment, the sewage is treated in a direct mode; the reaction with ozone is relatively slow, using indirect means, and is rapidly increasing (OH)^-Adding the promoter-hydrogen peroxide.

In the system, high oxidation and filtration are separated, a jet back-flushing type diatomite membrane filter is arranged behind the high oxidation process, the jet back-flushing type diatomite membrane filter comprises a diatomite supply device, a diatomite mixing box, a filter pump, a filter tank, a jet back-flushing device and the like, a tubular filter material which is internally sleeved with PP and PE by a spring and is externally, a mixture of diatomite, powdered activated carbon and the like which is mixed with water is circulated by the filter pump, a membrane with the thickness of about 3-5mm is formed on the filter material of the filter tank, and when raw water passes through the filter, micro-particles with the thickness of more than 0.5 mu m are filtered.

A first engineering:

a certain amount (600-²) Adding diatomite as filtering agent into diatomite mixing box, mixing with running water, circulating to filtering tank, and attaching diatomite to filtering material to form filtering layerAnd (3) a film forming process. Filtering after 10-15 minutes.

Purpose of filter film formation:

① prevent and protect against clogging of the filter material by suspended matter and colloidal particles.

② the filter is backwashed thoroughly.

③ the type of filter aid and the thickness of the membrane can be set according to the characteristics of the suspended matter.

And a second engineering:

after the membrane formation the valve was adjusted to start the filtration and the clean water from the filtration tank was added to the kieselguhr mixing tank (this was in preparation for the next membrane formation). In the filtering process, the suspended matter of more than 0.5 micron is filtered completely in the filtering layer, the filtering pressure rises along with the increase of the suspended matter on the filtering material, the pressure sensor arranged on the filtering tank gives out a signal, the filtering pump stops automatically, and the system enters the next engineering, namely the backwashing engineering.

The purpose of the filtering engineering is as follows:

① the suspended matter contained in the raw water is filtered to obtain clean water.

② the filter aid can be used to treat organic substances, color and turbidity.

③ ultraviolet lamp tube is installed at the water outlet of the filter for sterilizing the filtered water.

Third step of

The valve at the lower end of the canister was opened and compressed air (6 kg/cm) was blown from the upper end²) And discharging the filter aid and the foreign matters in the filter tank to the outside, and opening a clean water injection device valve at the lower end of the filter tank according to the properties of the raw water plankton to completely flush the foreign matters attached to the filter materials. The system enters the first project from the beginning.

There are two problems in general diatomaceous earth filtration that affect filtration efficiency:

one is that the filtration efficiency is reduced due to the pollution of the diatomite membrane and the deposition of the suspended matters on the filtration membrane influences the filtration efficiency;

the other is that the concentration of raw water increases as the filtration time increases when the raw water passes through the filtration membrane due to concentration polarization phenomenon, which causes the filtration pressure to increase, and thus the filtration efficiency is lowered. However, this does not permanently damage the filter membrane or reduce the filtration efficiency, which can be restored by backwashing.

At present, fluid mechanics is considered, and researches and developments are being made on various particle sizes and permeabilities of the diatomite to minimize the concentration polarization phenomenon. The fouling of the filtration membrane is due to the nature of the fed precipitation, on the surface of the filtration membrane, the deposition of fouling substances, and therefore the filtration efficiency is reduced. That is, the filtration rate is relatively high at the beginning, and the filtration rate is reduced gradually with the lapse of time, which is a cause of deposition of contaminants after formation of the contaminated layer.

The invention has the advantages that the high oxidation and the jet back flushing type diatomite membrane filter are combined together, and the oxidation and the filtration are carried out simultaneously, so that toxic organic matters such as SS, CODcr, BOD, odor removal, decoloration, turbidity, sterilization, benzene, PHENOL (Phenol) and the like contained in raw water are completely removed, and therefore, the domestic wastewater and the factory wastewater which meet the discharge standard after being treated are reused for domestic water and factory water after being treated by the system; and the device treats river water, pond water, underground water and the like to reach the standard of drinking water, and compared with similar products, the system has more superiority in technology, efficiency and economy.

The equipment can effectively treat the petrochemical wastewater which is difficult to treat and the wastewater which is difficult to decompose; and the concentration polarization phenomenon of the diatomite filter can be inhibited, and the backwashing period is prolonged, so that the cost is reduced and the treatment efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of a high oxidation filtration system.

Fig. 2 is a view showing the internal structure of the canister.

Fig. 3 is a view showing the internal structure of the spring-diatomite membrane filter stick.

FIG. 4 is a view showing the internal structure of a diatomaceous earth stirring tank

Wherein: 1 mixing tank, 2 reaction tank, 3 vortex pump, 4 hydrogen peroxide injection box and 5 ozone generator. 6 residual ozone heating decomposer, 7 diatomite boxes, 8 diatomite stirring boxes, 9 filter pumps, 10 filter tanks, 11 gas storage tanks, 12 spring-diatomite membrane filter rods, 13 counter-flow spray heads, 14 spring-diatomite membrane filter rod pressing plates, 15 spring-diatomite membrane filter rod sleeve plates, 16 stainless steel bolts, 17 stainless steel springs, 18 filter cloth bags, 19 diatomite membranes, 20 nylon ribbons and 21 internal gas inlet pipes.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

As shown in fig. 1, 2, 3, and 4. Raw water enters from the top of the mixing tank 1, ozone and hydrogen peroxide in the ozone generator 5 enter into a solution and water in the tank 4 from the bottom thereof through the vortex pump 3 to be mixed with the raw water and then enter into the reaction tank 2 to complete high oxidation contact reaction, and the filter pump 9 and the filter tank 10 are sequentially arranged behind the reaction tank 2 through pipelines. The residual ozone heating decomposer 6 is a discharge device for treating the gas generated in the ozone oxidation into harmless gas, and is arranged at the upper part of the reaction tank 2; when the filtration resistance is increased to a set value, the filtration work is stopped, a back washing program is started, firstly, a blow-down valve at the lower part of the filter tank 10 is opened, compressed air in the air storage tank 11 is blown into the filter bag from the water outlet of the spring-diatomite membrane filter rod 12 from top to bottom through the air inlet at the upper part of the filter tank 10, the diatomite membrane 19 adsorbed on the spring-diatomite membrane filter rod 12, filter residues and water are discharged together, and then the filter bag 18 and the tank are cleaned by injecting clean water into the reverse flow nozzle 13; when the membrane is prepared, a blow-off valve at the lower part of the filter tank 10 is closed, the diatomite filled in the diatomite tank 7 is fed into the diatomite stirring tank 8 through a screw feeding device, a certain amount of water is stored in the diatomite stirring tank 8, compressed air enters through an internal air inlet pipe 21 to be stirred into slurry, the slurry enters the filter tank 10 from the lower outlet of the diatomite stirring tank 8 through the water inlet of the filter tank 10, the diatomite slurry with even pressure in the filter tank 10 is adsorbed on the surface of the filter cloth bag 18 to form a diatomite membrane with the thickness of 3-5mm, and clear water is collected from the inside of the spring-diatomite membrane filter rod 12 from bottom to top and discharged from the top of the filter tank 10 and enters the diatomite stirring tank 8 to form the process of circularly preparing the diatomite membrane.

As shown in fig. 2, the housing of the filtering tank 10 is made of stainless steel material and is welded, the spring-diatomite membrane filtering rod pressing plate 14 is made of stainless steel material and is provided with through holes for water passing; the spring-diatomite membrane filter stick sleeve plate 15 is made of nylon materials,through holes are formed in the spring-diatomite membrane filter stick sleeve plate for mounting the spring-diatomite membrane filter stick 12, and the filter stick pressing plate 14 is connected with the filter stick sleeve plate 15 through stainless steel screws 16. The spring-diatomite membrane filter rod 12 is used for filtering water.

As shown in fig. 3, the stainless spring 17 is made of stainless steel, the filter cloth bag 18 is woven of PE, the diatomite membrane 19 is made of diatomite, and the nylon ribbon 20 is made of nylon. The filter cloth bag 18 is sleeved on the surface of the stainless steel spring 17, the bell mouth of the spring is fastened with the filter cloth bag by heat seal, the other end of the spring is fastened by a nylon binding belt 20, and the surface is attached with a diatomite membrane 19.

As shown in FIG. 4, the diatomite stirring tank 8 is made of stainless steel material by welding, and is internally provided with a compressed air inlet pipe 21 and a diatomite dilute slurry outlet, and water and diatomite in the tank enter compressed air through the compressed air inlet pipe 21 and are stirred into dilute slurry.

Claims

The high oxidation filtration system comprises a high oxidation mixing tank, a high oxidation contact reaction tank, a filtration pump and a diatomite membrane filtration tank. The device is characterized in that a water outlet of the high oxidation contact reaction tank is connected with a water inlet of a filter pump, and a water outlet of the filter pump is connected with a water inlet of a diatomite membrane filter tank; the high oxidation mixing tank is communicated with the bottom of the high oxidation contact reaction tank, and the lower part of the high oxidation mixing tank is provided with a vortex pump, an ozone generator and a hydrogen peroxide injection box; the diatomite membrane filtering tank is provided with an air storage tank, a diatomite box and a diatomite mixing box.
The system of claim 1, wherein: the spring-diatomite membrane filter rod is arranged in the diatomite membrane filter tank and consists of a stainless steel spring, a filter cloth bag, a diatomite membrane and a nylon ribbon.
The system of claim 1, wherein: a reverse flow spray head is arranged inside the diatomite membrane filtering tank.
The system of claim 1, wherein: the diatomite stirring box is provided with an internal air inlet pipe.