WO2007118425A1

WO2007118425A1 - A method and an apparatus for treating wastewater

Info

Publication number: WO2007118425A1
Application number: PCT/CN2007/001219
Authority: WO
Inventors: Dawei Zhang
Original assignee: Dawei Zhang
Priority date: 2006-04-13
Filing date: 2007-04-13
Publication date: 2007-10-25

Abstract

A method for treating wastewater comprises the wastewater flows through the activated carbon. The flow velocity of the wastewater is ≤0.05m/min, the flow quantity in per square meter section of the wastewater is ≤1m3/hour and granularity of activated carbon is ≤20 mesh. An apparatus for treating wastewater comprises an activated carbon absorber column with a feed port on the top of it and a discharge port at the bottom of it. The column is filled with the activated carbon whose granularity is ≤20 mesh. There are outlet pipes on both sides on the upper part of the column, one end of the outlet pipe is outlet, and the other end of it connects with the multi annular outlet pipes. There are outlet holes on the annular outlet pipes. There is an inlet pipe on one side at the lower part of the column, one end of the inlet pipe is water inlet, and the other end of it connects with the multi annular inlet pipes. There are inlet holes on the annular inlet pipes.

Description

Method and device for treating dirty ice

The invention belongs to the technical field of industrial wastewater and urban sewage treatment, and particularly relates to a method for treating industrial wastewater and urban sewage by using activated coke. The invention also relates to an apparatus for carrying out the above method. Background technique

At present, industrial wastewater and urban sewage treatment are treated with facilities such as grids, hydraulic screens, homogenization tanks, primary sedimentation tanks, aeration tanks, secondary sedimentation tanks, inclined tube sedimentation tanks, etc. The pesticides are subjected to biochemical and physical treatment such as sedimentation, flocculation, air flotation, activated sludge, aeration, anaerobic, fermentation, etc. The inadequacies of the above facilities and equipment are complicated technology, large floor space, and large power consumption. Operating costs髙, especially when dealing with industrial wastewater and waste liquids with high chemical oxygen demand (COD) values and complex composition, it is difficult to meet the required standards.

Active coke is a kind of carbon material with developed internal pore structure, large specific surface area and strong adsorption capacity. It is a good adsorbent material and is usually used for flue gas desulfurization. How to use industrial coke to treat industrial wastewater, urban sewage, etc., so that industrial wastewater, urban sewage and other treatments can reduce floor space, reduce power consumption, reduce processing costs and investment costs, and improve the processing capacity and quality of industrial wastewater and urban sewage. To meet the increasingly high environmental standards, it has not been reported so far. Summary of the invention

It is an object of the present invention to provide a sewage treatment method.

It is still another object of the present invention to provide an apparatus for implementing the above method.

In order to achieve the above object, the sewage treatment method provided by the present invention is:

The sewage is contacted with the activated coke, the flow rate of the sewage is ≤0.05m/min, and the flow rate of the sewage is ≤lm ³ /hour per square meter of the active coke cross-sectional area.

The sewage is industrial wastewater and urban sewage.

The particle size of the saliva is ≤ 20 mesh, and the active coke of particle size 30 does not exceed 20% of the total amount of active coke. The invention controls and adjusts the contact time of the sewage with the active coke during the treatment process by adjusting the water inflow amount of the sewage. According to another aspect of the present invention, there is provided a sewage treatment method comprising the steps of: setting active coke into a vessel, wherein the active coke has a particle size of ≤ 20 mesh; and inputting sewage into the vessel to make the sewage and the active Contact with the coke; and control the flow rate and flow rate of the sewage so that the flow of the sewage is 3⁄4 ≤ 0.05 m / min, and the flow rate of the sewage is per square meter According to still another aspect of the present invention, there is provided an apparatus for sewage treatment, comprising: an active coke adsorption tank body having a feed port at the top of the tank body; a discharge port at the bottom of the tank body, the tank body being filled with a particle size of ≤ 20 Purpose active coke;

A water outlet branch is arranged on the two sides of the upper part of the tank body, and one end of the water outlet branch pipe is a water outlet, and the other end is connected with a plurality of annular water outlet pipes in the tank body, and a water outlet hole is arranged on the annular water outlet pipe;

One side of the lower part of the tank body is provided with a water inlet branch pipe, one end of which is a water inlet, and the other end is connected with a plurality of annular inlet pipes in the tank body, and the inlet water pipe is provided with a water inlet hole;

The control of the water inlet pipe is wide, and is used for controlling the flow rate and flow rate of the sewage.

A drain pipe is installed on the other side of the tank corresponding to the inlet water port, and one end of the drain pipe is provided with a drain valve, and the other end is connected with a plurality of annular inlet pipes in the tank body.

In the active coke adsorption tank, the tank body is a cylinder, and the top and bottom are a head structure.

In the active coke adsorption tank, a feeding port cover is arranged on the feeding port, and a gasket is arranged between the two.

In the active coke adsorption tank, a discharge control valve is arranged at a lower portion of the discharge port at the center of the bottom.

The active coke adsorption tank has a discharge device below the discharge control valve.

The active coke adsorption tank, the discharge device is a screw pump, a plunger pump, a screw conveyor or a belt conveyor. In the active coke adsorption tank, the water outlet hole distributed on the annular water outlet pipe has a pore diameter of 3 mm to 5 mm _{; the} water inlet of the annular inlet pipe has a pore diameter of lmn! ~ 2mm.

In the active coke adsorption tank, the outer outlet of the annular outlet pipe is provided with a 30 mesh filter.

The active coke adsorption tank, the particle size of the filled body of the tank is 30, and the active coke does not exceed the total amount of active coke.

20%.

The active coke adsorption tank provided by the invention processes industrial wastewater, urban sewage, reduces chemical oxygen demand (COD), suspended matter (SS) value in wastewater and sewage, and processes chemical oxygen demand (COD) and suspended matter ( SS) High-value wastewater and sewage have good effects, which can improve the treatment quality of wastewater and sewage, reduce the power consumption of wastewater and sewage treatment, and save waste water and sewage treatment costs.

In detail, the plurality of annular outlet pipes and annular inlet pipes installed in the active coke adsorption tank provided by the present invention have a distance between the center lines of each of the two annular outlet pipes of 200 to 260 mm, and the outermost annular outlet pipe The horizontal distance between the center line and the inner wall of the active coke adsorption tank is 200~260mm, and the vertical distance between the center line of the annular outlet pipe and the lower edge of the top feeding port of the active coke adsorption tank is 300~350mni. All the annular outlet pipes are connected by the outlet pipe to the outlet pipe. Outside the active coke adsorption tank; the distance between the centerline of each two annular inlet pipes is 200~300mm, the outermost ring The horizontal distance between the center line of the shaped inlet pipe and the inner wall of the active coke adsorption tank is 200~300mm, and the vertical distance between the center line of the bottom annular inlet pipe and the upper edge of the discharge opening of the active coke adsorption tank is 300~400mm; the center line of the annular outlet pipe The vertical distance between the center line of the latest row of annular inlet pipes is 1,300~1,600mm. All the annular inlet pipes are connected by the inlet pipe to the outside of the active coke adsorption tank. The inlet pipe is equipped with the inlet valve. .

The volume of the active coke adsorption tank provided by the present invention is designed according to the amount of treated water. The water flow rate per square meter of the activated coke adsorption tank is ≤lm ³ /hour, and the contact time of the wastewater, sewage and activated coke in the activated coke adsorption tank should be ≥25 minutes, and the flow rate of the treated water is ≤0.05m/min. The inlet valve installed on the inlet branch pipe regulates the flow rate of wastewater and sewage in the activated coke adsorption tank, and controls and adjusts the contact time of the wastewater and sewage with the activated coke during the treatment process.

The specifications of the annular outlet pipe and the annular inlet pipe are designed according to the treated water flow rate. A hole of 3mm~.5mm is distributed on the annular outlet pipe, and the line spacing and spacing between the hole and the center line of the hole are 15mm~20mm, and the outer sleeve of the annular outlet pipe has a 30-mesh filter net. A hole of lmm~2mm is distributed on the annular inlet pipe, and the line spacing and spacing between the hole and the center line of the hole are 20mm~30nnn. The activated coke adsorption tank, annular outlet pipe and annular inlet pipe should be made of corrosion-resistant materials or treated with anti-corrosion treatment.

When the industrial waste water and the municipal sewage are treated by the active coke adsorption tank provided by the invention, the activity of the activated coke adsorption tank is filled with the particle size ≤ 20 mesh, wherein ≤ 30 mesh does not exceed 20%, from the feed port of the activated coke adsorption tank. focal.

If the industrial wastewater and urban sewage that need to be treated are large, and the treatment with a single activated coke adsorption tank cannot meet the requirements of the treated water volume, more than two active coke adsorption tanks can be used in parallel to meet the requirements of the treated water volume; Industrial wastewater and municipal wastewater have high organic content. When a single activated coke adsorption tank cannot be used to meet the required treatment targets, more than two active coke adsorption tanks can be used in series to meet the requirements for water quality treatment.

All the annular inlet pipes of the activated coke adsorption tank are connected to the sewage pipe to the outside of the active coke adsorption tank. The sewage pipe is equipped with a sewage valve, and the sewage valve is periodically opened to accumulate sediments, flocs and dirt in the annular inlet pipe. Discharge, avoid blockage of the annular inlet pipe.

When the activated coke in the activated coke adsorption tank is saturated for a certain period of time, it is replaced. When the activated coke is replaced, the discharge control valve installed at the discharge port below the activated coke adsorption tank is opened, and the active coke with large adsorption amount and saturated content in the lower part of the activated coke adsorption tank is discharged, and is discharged by the discharge device installed under the discharge control width. To discharge. DRAWINGS

1 is a schematic view showing the structure of an active coke adsorption tank of the present invention;

Figure 2 is a cross-sectional view taken along line AA of Figure 1; Figure 3 is a cross-sectional view taken along line BB of Figure 1. detailed description

The description of the present invention is intended to be illustrative of the present invention, and is not to be construed as limiting the scope of the invention.

As shown in Fig. 1, the active coke adsorption tank provided by the present invention comprises a can body 1, and the can body 1 is a cylinder which is fixed to the bracket 9. The top and bottom of the can body 1 have a head structure, the top end of the top head has a feed port 3, and the upper portion thereof has a feed port cover 4. There is a gasket between the feed port 3 and the feed port cover 4. The bottom of the bottom of the tank body 1 has a discharge port 8, and the lower portion of the discharge port 8 is provided with a discharge control valve 14. Below the discharge control valve 14 is a discharge device 7, and the discharge device 7 can be a screw pump, a plunger pump, a screw conveyor, or a belt conveyor. The can 1 of the activated coke adsorption tank is filled with active coke 13 .

A plurality of annular outlet pipes 11 and an annular inlet pipe 12 are installed in the activated coke adsorption tank. The distance between the center lines of each of the two annular outlet pipes 11 is 200 to 260 mm, and the horizontal distance between the center line of the outer ring annular outlet pipe 11 and the inner wall of the active coke adsorption tank is 200 to 260 mm, and the center line and the activity of the annular outlet pipe 11 The vertical distance of the lower edge of the feed port 3 of the coke adsorption tank is 300~350mm, and all the annular water outlet pipes 11 are connected by the water outlet pipe 15 to the outside of the active coke adsorption tank, and the other end of the water outlet pipe 15 is the water outlet 2; The distance between the center line of the annular inlet pipe 12 is 200~300mm, and the horizontal distance between the center line of the outermost annular inlet pipe 12 and the inner wall of the active coke adsorption tank is 200~300mm, and the center line and activity of the bottom annular inlet pipe 12 are active. The vertical distance of the upper edge of the discharge opening 8 at the bottom of the coke adsorption tank is 300 to 400 mm _; the vertical distance between the center line of the annular outlet pipe 11 and the center line of the nearest row of the annular inlet pipe 12 is 1,300 to 1,600 mm. All of the annular inlet pipes 12 are connected to the outside of the active coke adsorption tank by the inlet branch pipe 5, and the inlet port is provided on the inlet branch pipe 5, and the inlet pipe 5 is mounted with the inlet valve 16.

Active focal volume of the canister ≤lm ³ / hr, the canister active coke wastewater treatment according to the design water flow rate of water, activated coke canister per square meter of cross-sectional area, the contact time with the water to be active coke for 25 minutes, treated water The flow rate was 0.05 m/min. The flow rate of waste water and sewage in the activated coke adsorption tank is adjusted by the water inlet on the water inlet pipe, and the contact time of the wastewater and the sewage with the filter material during the treatment process is controlled and adjusted.

The specifications of the annular outlet pipe 11 and the annular inlet pipe 12 are designed according to the treated water flow rate. 3mn on the annular outlet pipe 11! ~ 5mm hole, the line spacing and spacing between the hole and the hole center line is 15mm~20mm, and the outer outlet of the annular water outlet pipe 11 is provided with a 30 mesh filter. The lmn is distributed on the annular inlet pipe 12! ~ 2mm hole, the line spacing and spacing between the hole and the hole center line is 20mn! ~ 30mm. The inside of the tank 1, the annular outlet pipe 11, and the annular inlet pipe 12 should be made of corrosion-resistant materials or treated with anti-corrosion treatment. When the industrial waste water and the municipal sewage are treated by the active coke adsorption tank provided by the present invention, the tank body 1 is filled with a particle size of 20 mesh from the feed port 3 of the activated coke adsorption tank, wherein 30 mesh does not exceed 20% of the active coke 13 .

All the annular inlet pipes 12 of the activated coke adsorption tank are connected to the sewage pipe 10 to the outside of the active coke adsorption tank, and the sewage pipe 10 is provided with a sewage valve 6, and the sewage valve 6 is periodically opened to accumulate the sediment in the annular inlet pipe 12. , flocage, dirt discharge, to avoid blockage of the annular inlet pipe.

When the active coke 13 in the activated coke adsorption tank is saturated for a certain period of time, it is replaced. When the activated coke 13 is replaced, the discharge control valve 14 installed at the discharge port 8 below the activated coke adsorption tank is opened, and the active coke 13 having a large adsorption amount and saturated at the lower portion of the activated coke adsorption tank is discharged, and is installed by the discharge control valve 14 The discharge device 7 is discharged.

The operation of the activated coke adsorption tank of the present invention will be described below by way of example.

example 1 :

A paper mill uses 10 sets of 7.6-meter-diameter and 2.7-meter-high active coke adsorption tanks in parallel to deeply treat the wastewater after biochemical treatment and reuse it. The composition of the wastewater after biochemical treatment is:

Chemical oxygen demand (COD) 370mg/L, biochemical oxygen demand (BOD) 110mg/L, suspended solids (SS) 255mg/L, color 96 times, chloride 1130mg/L, alkalinity 12.4mg/L, Hardness 7mg / L, conductivity 5050, PH value 11.07.

Active coke adsorption tank parameters:

1, diameter: 7,600mm

2, height: 3,000mm

3. Handling water volume: 45m ³ / hour

4, water inlet: diameter 50mm

5, water outlet: diameter 60mm

6, annular inlet pipe: diameter 25mm

7, annular outlet pipe: diameter 32mm

There are 14 annular outlet pipes and 12 annular inlet pipes installed in the activated coke adsorption tank. The distance between the center line of each of the two annular outlet pipes is 260mm, and the center line of the outer ring annular outlet pipe and the inner wall of the active coke adsorption tank The distance is 200mm, the vertical distance between the center line of the annular outlet pipe and the lower edge of the top feeding port of the active coke adsorption tank is 300mm, and all the annular outlet pipes are connected by the outlet pipe to the outside of the activated coke adsorption tank; every two annular inlet pipe center lines The distance between the outermost annular inlet pipe center line and the inner wall of the active coke adsorption tank is 300mm, and the vertical distance between the bottom annular inlet pipe center line and the upper edge of the active coke adsorption tank bottom discharge port 8 is 300mm. 300mm; the vertical distance between the center line of the annular outlet pipe and the center line of the nearest annular inlet pipe is 1,600mm. All the annular inlet pipes are connected by the inlet pipe to the active coke adsorption tank, and the inlet branch pipe is installed. Inlet valve.

The amount of treated water per square meter of activated coke adsorption tank is lm ³ /hour, the contact time of wastewater, sewage and activated coke in the activated coke adsorption tank is 30 minutes, and the flow rate of treated water is 0.05 m/min. The inlet valve installed on the inlet pipe, for example, by adjusting the opening of the inlet valve, regulates the flow rate and flow rate of water in the activated coke adsorption tank, and controls and adjusts the contact time of the water with the activated coke during the treatment.

A 3 mm hole is distributed in the annular outlet pipe, the line spacing and spacing between the hole and the hole center line is 15 mm, and the outer outlet of the annular outlet pipe is provided with a 30 mesh filter. A 2 mm hole is distributed on the annular inlet pipe, and the line spacing and spacing between the hole and the hole center line are 30 mm. The tank body, the annular outlet pipe and the annular inlet pipe are made of stainless steel.

When the water is treated by the activated coke adsorption tank, the tank is filled with a particle size of 20 mesh from the feed port of the activated coke adsorption tank, wherein 30 mesh does not exceed 20% of the activated coke.

After biochemical treatment, the wastewater is transported by the water pump to the influent main pipe. The inlet of each active coke adsorption tank is connected to the influent main pipe, and the wastewater enters the active coke adsorption tank through the inlet of each active coke adsorption tank. The holes in the annular inlet pipe in the active coke adsorption tank are hooked out, go up through the active coke adsorption layer, enter the annular outlet pipe through the hole in the annular outlet pipe, and then flow out through the water outlet to enter and absorb each active coke The outlet pipe connected to the tank outlet is discharged through the outlet pipe.

Each annular inlet pipe of each active coke adsorption tank is connected to the sewage pipe to the outside of the active coke adsorption tank. The sewage pipe is equipped with a #soil valve, and the sewage valve of each active coke adsorption tank is periodically opened to be concentrated in the annular water inlet. The sediment, floc and dirt in the pipe are discharged to avoid blockage of the annular inlet pipe.

After deep treatment with active coke adsorption tank, the composition of water is - chemical oxygen demand (COD) 63mg / L, biochemical oxygen demand (BOD) 20mg / L, suspended solids (SS) 17mg / L, color is 16 times Chloride 512mg/L, alkalinity 2.4mg/L, hardness 7mg/L, conductivity 2150, PH value 7.07.

When the activated coke in the activated coke adsorption tank is saturated for a certain period of time, it is replaced. When replacing the activated coke, open the discharge control valve installed at the discharge port below the activated coke adsorption tank, and place the active coke adsorption tank. The large amount of adsorption, saturated active coke discharge, and discharged by the discharge device (screw pump) installed under the discharge control valve, and sent to the centrifugal dehydrator installed in the water treatment plant for dehydration. The saturated activated coke after dehydration is thermally regenerated, activated, and reused, and the dehydrated saturated coke can also be made into boiler fuel. Refilling the tank with a particle size of ≤20 mesh through the feed port at the top of the activated coke adsorption tank, wherein ≤30 mesh does not exceed 20% of the active coke.

While the present invention has been described in detail with reference to the embodiments of the present invention, it will be understood by those skilled in the art

Claims

Rights request

1. A sewage treatment method: contacting sewage with active coke, the flow rate of sewage is ≤0.05m/min, and the flow rate of sewage is the flow rate per square meter of active coke cross-sectional area ≤lm ³ /hour; wherein the particle size of active coke is ≤ 20 mesh.

2. The sewage treatment method according to claim 1, wherein the sewage is industrial wastewater and municipal sewage.

The sewage treatment method according to claim 1, wherein the active coke of the particle size 30 does not exceed 20% of the total amount of the active coke.

4. The sewage treatment method according to claim 1, wherein the contact time of the sewage with the activated coke during the treatment is controlled and adjusted by adjusting the amount of water entering the sewage.

5. A sewage treatment method comprising the steps of:

Setting active coke into a container, wherein the active coke has a particle size of ≤ 20 mesh;

Injecting sewage into the vessel to bring the sewage into contact with the active coke;

The flow rate and flow rate of the sewage are controlled so that the flow rate of the sewage is ≤0.051^1^1!, and the flow rate of the sewage is the flow rate of the active focal length per square meter ≤lm ³ /hour.

6. The sewage treatment method according to claim 5, wherein the sewage is industrial wastewater and municipal sewage.

The sewage treatment method according to claim 5, wherein the active coke having a particle diameter of 30 does not exceed 20% of the total amount of the active coke.

8. The sewage treatment method according to claim 5, wherein the step of inputting sewage into the vessel comprises: providing a water inlet branch connected to the vessel, the sewage entering the vessel through the inlet branch pipe in.

9. The sewage treatment method of claim 8, wherein the step of controlling the flow rate and flow rate of the sewage comprises:

Providing a control valve on the water inlet pipe, and controlling the flow rate and flow of the sewage by adjusting the control valve

10. The sewage treatment method according to claim 9, wherein:

By adjusting the control valve, the contact time of the sewage and the activated coke is ≥ 25 minutes.

11. The sewage treatment method according to claim 5, further comprising the steps of:

A water outlet branch connected to the container is provided, and sewage that has been in contact with the active coke is discharged to the outside of the container through the water outlet branch.

The sewage treatment method according to claim 5, wherein the vessel is an active coke adsorption tank, the tank The body is a cylinder, and the top and bottom are a head structure.

13. The sewage treatment method according to claim 12, wherein:

The top of the tank body is provided with a feeding port, and the activated coke is added to the container through the feeding port; a discharge port is arranged at the bottom of the tank body, and the activated coke which is in contact with the sewage and reaches a saturated state is discharged through the discharge port. To the outside of the tank.

14. The sewage treatment method according to claim 8, wherein:

The container is further provided with a sewage pipe connected to the water inlet pipe.

15. The sewage treatment method according to claim 12, wherein:

One end of the water outlet pipe is a water outlet, and the other end is connected with a plurality of annular water outlet pipes in the tank body, wherein the water outlet hole is distributed on the annular water outlet pipe;

One end of the water inlet pipe is a water inlet, and the other end is connected with a plurality of annular inlet pipes in the tank body, and the inlet water pipe is distributed on the annular water inlet pipe.

16. A device for sewage treatment, comprising:

The active coke adsorption tank body has a feeding port at the top of the tank body; the bottom of the tank body has a discharge port, and the tank body is filled with active coke having a particle diameter of ≤20;

a control valve disposed on the water inlet pipe for controlling a flow rate and a flow rate of the sewage. .

17. The apparatus for sewage treatment according to claim 16, wherein - the other side of the water inlet is provided with a sewage pipe, one end of the sewage pipe is provided with a sewage valve, and the other end is connected with a plurality of rings in the tank body. The water pipes are connected.

18. The apparatus for sewage treatment according to claim 16, wherein the can body is a cylinder, and a top and a bottom thereof are a head structure.

19. The apparatus for sewage treatment according to claim 16, wherein the feed port is provided with a filler cap with a gasket therebetween.

20. The apparatus for sewage treatment according to claim 16, wherein a discharge control valve is provided at a lower portion of the discharge port at the center of the bottom of the tank body. '

21. The apparatus for sewage treatment according to claim 20, wherein a discharge setting is provided below the discharge control valve Ready.

22. Apparatus for sewage treatment according to claim 21 wherein the discharge device is a screw pump, a plunger pump, a screw conveyor or a belt conveyor.

23. The apparatus for sewage treatment according to claim 16, wherein the water outlet hole distributed on the annular water outlet pipe has a pore diameter of 3 _{mm to 5} mm; and the water inlet port distributed on the annular inlet pipe has a pore diameter of 1 mm to 2 mm.

24. Apparatus for sewage treatment according to claim 16 or 23, wherein the outer portion of the annular outlet pipe is provided with a 30 mesh filter.

The apparatus for sewage treatment according to claim 16, wherein in the activated coke filled in the can body, the active coke having a particle diameter of ≤ 30 or more does not exceed 20% of the total amount of the active coke.

26. The apparatus for sewage treatment according to claim ¹⁴ , wherein: .

The vertical distance between the center line of the annular outlet pipe and the center line of the nearest annular inlet pipe is 1,300~1, 600mm