CN101618923B - Wastewater treatment method - Google Patents

Abstract

The invention relates to a sewage treatment method. Sewage treatment is carried out in an integrated sewage treatment device developed by ourselves: the water inlet pump is powered by a generator, and the sewage is driven into the sump, and the sewage flows into the anaerobic pool through the water device, and the anaerobic pool begins. Integrated sewage treatment of oxygen treatment, aerobic treatment, moving bed biofilm reactor treatment, secondary precipitation treatment, ozone catalytic oxidation treatment and chlorine dioxide disinfection treatment. Due to the adoption of the integrated sewage treatment device in the present invention, the integrated sewage treatment of anaerobic treatment, aerobic treatment, moving bed biofilm reactor treatment, secondary precipitation treatment, ozone catalytic oxidation treatment and chlorine dioxide disinfection treatment is carried out. While ensuring the water quality after treatment and avoiding new environmental pollution, it also solves the problems of local water intake, local treatment, and local reuse; it can timely go to temporary construction sites, emergency accidents, disaster prevention, disaster mitigation and other non-fixed sewage sites for sewage treatment It can be used for lawn, landscaping, toilet flushing and irrigation at any time.

Description

A kind of sewage treatment method

technical field

The invention belongs to the technical field of sewage treatment, in particular to a sewage treatment method.

Background technique

Most of the northern regions of my country are in arid or semi-arid state, and water resources have become so tight that they have become the main bottleneck restricting the rapid economic development of some regions in our country. On the one hand, water resources are scarce, and on the other hand, a large amount of untreated sewage cannot be used, and it also causes serious pollution to the environment and groundwater. Under the atmosphere of global commitment to environmental protection, the sewage treatment industry has become an emerging industry, and it is in the same important position as the production of tap water, water supply, and drainage industries.

After searching, it is found that the patent number is 02144524.9, the publication number is CN1422817A, and the patent name is: the invention patent of anaerobic-facultative-aerobic-aerobic integrated sewage treatment method and recycling equipment. The specification mentions various sewage treatment in the prior art and water reuse treatment methods, but there are respective deficiencies. The existing sewage treatment technologies mentioned in the patent include: treatment processes controlled separately by multi-stage equipment, such as: aerobic-aerobic-anaerobic treatment process; post-nitrification process, such as: anaerobic (denitrification)-aerobic ( organic carbon) - aerobic (nitrification) - return to the anaerobic section (partial discharge); sequencing batch activated sludge SBR process; continuous anaerobic - anoxic - aerobic treatment process; patent mentioned reuse Existing technologies for treatment include: biological method, electrolysis method, chemical oxidation method, adsorption method, physical separation method, organic and organic chemical precipitation method from inorganic salts, electrodialysis method, reverse osmosis method and application of membrane technology in water reuse treatment wait. In view of the above deficiencies, the patent discloses an anaerobic-facultative-aerobic-aerobic integrated sewage treatment method and recycling equipment. Through this equipment, an anaerobic-facultative-aerobic integrated treatment method can be realized. This method can be used according to different water quality requirements Treating different water quality can dehydrate the sludge and avoid new environmental pollution. However, because this method cannot meet the higher requirements of effluent water quality and relies on immovable equipment, it cannot handle sewage in non-fixed areas such as temporary construction sites, emergency accidents, and disaster prevention and mitigation.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a sewage treatment method. The method adopts an integrated sewage treatment device, which solves the problem of local water intake while ensuring the water quality after treatment and avoiding new environmental pollution. , On-site processing, and on-site reuse.

The present invention solves its technical problem and realizes by taking the following technical solutions:

A kind of sewage treatment method, carries out sewage treatment in integrated sewage treatment device, and its step comprises:

(1) Anaerobic treatment: pre-anaerobic treatment puts the sewage into the anaerobic tank, and the anaerobic bacteria carry out hydrolysis and acidification, and the macromolecular organic matter is degraded into small molecular substances, so as to realize the removal of part of COD;

(2) Aerobic treatment: enter the aerobic tank into the aerobic tank for treatment of the sewage; start the aeration fan in the aerobic tank, and directly inject the microbubbles into the sewage in the aerobic tank. Under the action of oxygen bacteria, the organic matter is degraded into inorganic matter;

(3) Moving bed biofilm reaction treatment: the sewage after aerobic treatment is placed in the moving bed biofilm reactor, the carrier in the reactor wraps the filler, the aeration fan is started, and the carrier is in a suspended state in the moving bed biofilm reactor , all-round freedom of movement;

(4) Secondary sedimentation treatment: the sewage treated by the moving bed biofilm reactor is placed in the secondary sedimentation tank, and after secondary sedimentation and filtration, suspended matter is removed in the secondary sedimentation tank;

(5) Ozone catalytic oxidation treatment: The sewage treated by the secondary sedimentation tank is placed in the ozone catalytic oxidation tank, and the ozone generator provides ozone to the ozone catalytic oxidation tank to oxidize refractory organic matter, further remove the refractory biodegradable substances, and obtain clear water ;

(6) Disinfection treatment: The clear water after ozone catalytic oxidation treatment is put into the clear water pool, and the chlorine dioxide generator provides chlorine dioxide to the clear water pool to disinfect the clear water to meet the residual chlorine requirements of the clear water.

Moreover, the sewage after pre-anaerobic treatment in (1) enters the next anaerobic tank for further hydrolysis and acidification to remove part of COD.

Moreover, (2) the sewage after aerobic treatment enters the next aerobic pool to remove most of the COD.

Moreover, (3) the carrier is casted from spherical polypropylene material, and the packing inside the carrier is porous granular filter material, and its main components include silicon, aluminum, calcium, sodium, magnesium, titanium, manganese, iron, nickel, cobalt and irregular porous light particles of molybdenum minerals and trace elements.

Advantage and positive effect of the present invention are:

1, the present invention is owing to adopted integrated sewage treatment device, carries out the integrated sewage treatment of anaerobic treatment, aerobic treatment, moving bed biofilm reactor treatment, secondary precipitation treatment, ozone catalytic oxidation treatment and disinfection treatment, in guaranteeing The quality of reused water after treatment avoids new environmental pollution, and at the same time solves the problems of on-site water intake, on-site treatment, and on-site reuse.

2. The present invention can timely go to temporary construction sites, emergency accidents, disaster prevention, disaster reduction and other non-fixed sewage sites for sewage treatment, and can be used for irrigation of lawns, landscaping, toilet flushing and agriculture at any time, saving a lot of tap water; greening on both sides of urban roads For water use, if this method is adopted, the water can be taken in situ, treated in situ, and reused in situ, which can reduce the large construction cost of laying pipelines, and also has broad application prospects.

Description of drawings

Fig. 1 is a process flow diagram of the sewage treatment method of the present invention;

Fig. 2 is the sewage treatment device schematic diagram that sewage treatment method of the present invention uses;

Fig. 3 is a schematic sectional view of A-A of Fig. 1;

Fig. 4 is the comparative figure of COD index after raw sewage of the present invention, anaerobic treatment, aerobic treatment;

Fig. 5 is a comparison chart of ammonia nitrogen content in raw sewage and clear water ammonia nitrogen content in the present invention.

Detailed ways

Below in conjunction with accompanying drawings 1-5, the present invention will be further described in detail through specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

The sewage treatment method of the present invention is to carry out sewage treatment in the integrated sewage treatment device developed by oneself:

Powered by the generator, the water inlet pump is turned on, the sewage is driven into the sump, and the sewage flows into the anaerobic tank through the water passing device, and anaerobic treatment, aerobic treatment, moving bed biofilm reactor treatment, secondary precipitation treatment, ozone catalysis are started Integrated sewage treatment of oxidation treatment and disinfection treatment, the steps include:

(1) Anaerobic treatment: Pre-anaerobic treatment is performed first to improve the biodegradability of sewage and achieve partial COD removal. Put the sewage into the anaerobic tank, where it is hydrolyzed and acidified by anaerobic bacteria, and most of the organic pollutants are degraded in it, and part of the COD is removed; the sewage after pre-anaerobic treatment enters the next anaerobic tank for further hydrolysis and acidification , part of the COD is removed again, and most of the organic pollutants are degraded. Since the anaerobic treatment does not consume power, the pre-anaerobic treatment not only greatly reduces the energy consumption of the subsequent aerobic treatment, but also reduces the load of the aerobic treatment;

(2) Aerobic treatment: enter the aerobic tank into the aerobic tank for treatment of the sewage; start the aeration fan in the aerobic tank, and directly inject the microbubbles into the sewage in the aerobic tank. Under the action of oxygen bacteria, the organic matter is degraded into inorganic matter;

(3) Moving bed biofilm reactor treatment: The sewage after aerobic treatment is placed in a moving bed biofilm reactor, which contains a carrier, and the carrier is wrapped with filler; the filler is a porous granular filter material, and its main component is Dozens of minerals and trace elements such as silicon, aluminum, calcium, sodium, magnesium, titanium, manganese, iron, nickel, cobalt and molybdenum, appear as irregular particles, dark brown in color, porous and light; start aeration The fan and the carrier are suspended in the moving bed biofilm reactor and move freely in all directions; the basic design idea of the moving bed biofilm reactor is to be able to run continuously, without clogging, without backwashing, with small head loss, and biological Carriers have a larger radiant area and can grow on smaller carrier units through biofilms.

(4) Secondary sedimentation treatment: the sewage treated by the moving bed biofilm reactor is put into the secondary sedimentation tank, and after secondary filtration, the suspended solids are removed in the secondary sedimentation tank;

(5) Ozone catalytic oxidation treatment: The sewage treated by the secondary sedimentation tank is placed in the ozone catalytic oxidation tank, and the ozone generator provides ozone to the ozone catalytic oxidation tank to oxidize refractory organic matter, further remove the refractory biodegradable substances, and obtain clear water ;

(6) Disinfection treatment: Put the clean water after ozone catalytic oxidation treatment into the clean water pool, and the chlorine dioxide generator provides chlorine dioxide to the clean water pool to disinfect the clean water, so as to meet the requirements of residual chlorine in the clean water and achieve various reuse water quality Finally, the treated water will be stored in the clear water pool. After the test of the water quality testing instrument, the index of the treated water is COD≤50mg/L, SS≤10mg/L ammonia nitrogen≤8mg/L, which meets the national standard and can be widely used Applied to toilet flushing, greening, car washing, road flushing, crop irrigation, etc.

Comparison of Influent Water Quality Index and Outlet Water Quality Index of the present invention

The device preparation process that is used for above-mentioned sewage treatment method:

The device selects a box body 31 made of automobile oil tank or glass fiber reinforced plastics. There is a movable cover on the box body. Four lifting lugs 5 are fixed on both sides of the box body. A hole is punched at both ends of the box body, and one end is connected to the water inlet 1 and the other. One end is connected to the water outlet 19, and a partition made of glass fiber reinforced plastic is used to separate the sump 2, the reaction unit and the clean water pool 18 in sequence from the water inlet to the water outlet in the box, and then the partition is used to separate the reaction unit from the adjacent sump. Sequentially divided into two anaerobic pools 6, two aerobic pools 9, a moving bed biofilm reactor 12, a secondary sedimentation tank 15 and a catalytic oxidation tank 17, in order to effectively flow the treated water in the reaction tank to the phase The next adjacent reaction tank has a water passing device in each reaction tank; the water passing device in the anaerobic tank is composed of anaerobic cloth water tank 3 and anaerobic cloth water pipe 4, wherein the anaerobic cloth water tank is horizontally fixed on the top of the partition , There is a row of holes at the bottom, and a row of anaerobic cloth water pipes are perpendicular to the lower end of the bottom hole of the anaerobic cloth tank; the water passing device in the aerobic pool adjacent to the anaerobic pool is a good one fixed horizontally on the adjacent partitions of the two pools Oxygen distribution tank 8; there is a water outlet 10 on the adjacent clapboard between the two aerobic tanks as a water outlet; The water device is a secondary settling tank inlet pipe 13 with one port located in the moving bed biofilm reactor and the other port connected to the secondary settling tank central pipe 14; The water outlet 16 makes the treated water in the secondary sedimentation tank flow to the ozone catalytic oxidation tank, and then flow to the clean water tank through the holes on the adjacent partition plates of the ozone catalytic oxidation tank and the clean water tank. The connection between the secondary settling tank and the aerobic tank is connected by a return pipe 11, and there is a return pipe regulating valve 7 on the return pipe, so that the sludge treated in the secondary settling tank flows to the aerobic tank through the return pipe.

There are aeration fan 26, water inlet pump 27, ozone generator 28 and chlorine dioxide generator 29 in the space below the sump in the box; the aeration fan is connected to the fan inlet 30, preferably through a metal or PVC aeration pipe 22 The oxygen tank and the moving bed biofilm reactor provide air, and there is an aeration pipe regulating valve 23 on the aeration pipe. 25; the water inlet pump leads to the water inlet; the ozone generator leads to the ozone catalytic oxidation tank to provide ozone to oxidize refractory organic matter; the chlorine dioxide generator leads to the clean water tank to provide chlorine dioxide to disinfect the treated clean water to meet the Residual chlorine requirements for clean water.

The moving bed biofilm reactor (MBBR) has the characteristics of high processing capacity, small footprint, compact structure, and no sludge expansion. In the biofilm reactor, as the active carrier of microorganisms, relying on the lifting effect of aeration and water flow, the carrier is in a suspended and fluidized state, and can move freely in all directions without fixing, just set up a retention net at the water outlet ; The active carrier is cast from polypropylene material, which has the characteristics of corrosion resistance and high strength. The filler added in the carrier is a porous granular filter material, and its main components are dozens of minerals and trace elements such as silicon, aluminum, calcium, sodium, magnesium, titanium, manganese, iron, nickel, cobalt and molybdenum. Irregular particles, dark brown in color, light in porosity; the proportion of each component in the filler needs to be determined through experiments according to the characteristics of wastewater quality and high-efficiency composite bacteria, not only to increase the holding amount of microorganisms on the carrier (so that The removal efficiency of COD, ammonia nitrogen, etc. is above 90%), and it is necessary to prevent the rapid growth of microorganisms and cause blockage, and the treatment time is short, reducing energy consumption and reducing the amount of excess sludge.

There is a pump room 21 for storing temporary water pipes and pumps at the bottom of the secondary settling tank, and a mud discharge port 24 for the secondary settling tank; there are vents 20 at the lower ends of the sides of each tank. Reactors can be mounted on vehicles or buried underground.

The microorganisms suitable for removing the pollutants in the treated sewage are selected from the activated sludge and artificially expanded and cultivated, and then added to the anaerobic tank, aerobic tank and moving bed biofilm reactor.

Working principle of sewage treatment method of the present invention:

Sewage is hydrolyzed and acidified in anaerobic tank, treated in aerobic tank, and then enters the moving bed biofilm reactor, where most of the organic pollutants are degraded, filtered through the filter to remove suspended solids, and then enters the ozone catalytic oxidation tank to make difficult organisms The degraded substances are further removed to meet various water quality requirements.

Claims (3)

1. sewage water treatment method, it is characterized in that: carry out sewage disposal in integrated sewage treating apparatus, its step comprises:

(1) anaerobic treatment: preposition anaerobic treatment is inserted anaerobic pond with sewage, and by the anerobe acidifying that is hydrolyzed, larger molecular organics is degraded into small-molecule substance, realizes the removal of portion C OD;

(2) aerobic treatment: will enter Aerobic Pond and handle through the sewage of anaerobic treatment by aerobic bacteria; In Aerobic Pond, start Aeration fan, microbubble is directly injected the sewage of Aerobic Pond, under the effect of aerobic bacteria, organic matter degradation is become inorganics;

(3) moving-bed biofilm reaction treatment: the sewage after the aerobic treatment is inserted in the MBBR, and carrier parcel filler starts Aeration fan in the reactor, and carrier is in suspended state in MBBR, and is comprehensive free movable;

(4) secondary sedimentation is handled: the sewage after MBBR is handled is inserted second pond, through secondary sedimentation, filtration, removes suspended substance in second pond;

(5) catalytic ozonation is handled: the sewage after second pond is handled is inserted the catalytic ozonation pond, and ozonizer provides ozone to the catalytic ozonation pond, and the oxidation hardly degraded organic substance is further removed the material of difficult for biological degradation, obtains clear water;

(6) disinfect: the clear water after catalytic ozonation is handled is inserted clean water basin, and chlorine dioxide generator provides dioxide peroxide to clean water basin, clear water is carried out disinfection, to satisfy the chlorine residue requirement of clear water.

2. sewage water treatment method according to claim 1 is characterized in that: the sewage in (1) after the preposition anaerobic treatment enters the further acidication of next anaerobic pond again, removes portion C OD.

3. sewage water treatment method according to claim 1 is characterized in that: the sewage after (2) aerobic treatment enters next Aerobic Pond again and removes most COD.

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