CN113603216A

CN113603216A - Efficient contact type anaerobic reactor and method for treating wastewater

Info

Publication number: CN113603216A
Application number: CN202110972839.1A
Authority: CN
Inventors: 彭吉成
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2021-11-05

Abstract

The invention relates to a high-efficiency contact type anaerobic reactor and a method for treating waste water, the reactor comprises an anaerobic reactor main body, the anaerobic reactor main body comprises a reaction zone at the front end and a separation zone at the rear end, the reaction zone and the separation zone are connected through a water passing zone, the reaction zone is formed by connecting more than one reaction chambers in series, the separation zone is provided with a built-in secondary mud-water separation zone through a support, the lower part of the separation zone is provided with a primary mud collection zone, the lower part of the built-in secondary mud-water separation zone is provided with a secondary mud collection zone, the lower side wall of the built-in secondary mud-water separation zone is provided with a water distribution port, the upper part of the built-in secondary mud-water separation zone is sequentially provided with two support frames, a water outlet groove, a water outlet and a water drainage groove along the water outlet direction, the support frames are provided with a three-phase separator and a filler, and the primary mud collection zone and the secondary mud collection zone are connected with a sludge pump. The invention has the advantages of large-range allowable water inlet SS, simple operation, strong adaptability, stable operation and greatly reduced suspended substances in the effluent of the system.

Description

Efficient contact type anaerobic reactor and method for treating wastewater

Technical Field

The invention relates to a high-efficiency contact type anaerobic reactor and a method for treating wastewater, belonging to the technical field of environment-friendly water treatment and purification.

Background

In recent years, with the gradual implementation of national environmental protection policies, the investment construction of industrial enterprises on sewage treatment systems is gradually strengthened. Because the available water volume of people in our country is relatively low, the use cost of industrial water is increased year by year, and the sewage discharge requirement is continuously improved and stricter.

Under the influence of waste paper import policy, most of raw materials used by enterprises for pulping and papermaking by waste paper in China are domestic waste, and domestic waste paper is recycled for multiple times, so that the quality of the raw materials is increasingly poor; in the production process of an enterprise, in order to ensure the quality of paper, a large amount of chemicals have to be added to ensure the product quality, and meanwhile, the waste paper box can contact with various substances in the using and turnover process. The pollutant load and total concentration of waste water generated in the process of recycling the waste paper are higher and higher, the pollutant components contained in the pulping and papermaking waste water tend to be complex, and the high-sulfur, high-salt, high-load and complex pollutant components become the characteristics of the part of the waste water, so the part of the waste water is industrial waste water with higher treatment difficulty.

At present common upflow anaerobic tower, as CN108147533A discloses an upflow anaerobic reactor, including sludge bed reactor and the three-phase separator of setting top in sludge bed reactor, be equipped with a plurality of baffle in the sludge bed reactor, divide into a plurality of compartment with sludge bed reactor, be equipped with water inlet and delivery port on the compartment of sludge bed reactor both sides, the delivery port is located the top of water inlet, a plurality of gas vent has been seted up to sludge bed reactor's top, the outside of compartment is equipped with heating device, still be equipped with circulation water inlet and circulation delivery port on the compartment, heating device and circulation water inlet and circulation delivery port intercommunication. In order to prevent the problems of scaling, blockage, sludge calcification and the like, the SS of the anaerobic influent water is required to be not higher than 400 mg/L. The prior pulping and papermaking wastewater, particularly the waste paper pulping and papermaking wastewater, has the COD load of sewage of 10000mg/L or more because the water consumption of clear water is reduced in the production process. Due to the fact that pollution load in the wastewater is high, SS of the wastewater is difficult to be reduced to be below 800-1000 mg/L by a common pretreatment mode, and if the concentration of suspended matters entering the anaerobic mode is strictly controlled to meet the requirement of conventional anaerobic mode, a large amount of medicines need to be added into the wastewater. Firstly, increased the treatment cost of waste water, secondly greatly increased salt content and sludge content in the sewage, because the increase of salt content, the waste water after handling can't the retrieval and utilization because the salt content in the retrieval and utilization aquatic is one of the key index that influences the retrieval and utilization of pulping and papermaking waste water. In the process of anaerobic wastewater treatment, if the inlet water SS is not well controlled, serious scaling and blockage phenomena can occur in the anaerobic process, so that an anaerobic system can not normally operate, and the normal production of enterprises is seriously influenced. The original upflow anaerobic treatment system is taken as the most important working section of sewage treatment, and is gradually not suitable for the technical process requirements of high-concentration high-suspended solids, low treatment cost, continuous and stable water treatment of the sewage of the present enterprises.

Further, the applicant's earlier patent document CN201258280Y discloses an integrated internal circulation anaerobic sludge reactor. Although the problems of poor efficiency, poor continuous operation performance, high treatment cost and the like are solved, when the SS of inlet water is higher than 800mg/L, the problems of blockage, collapse and the like can occur, and the SS of outlet water is correspondingly increased to influence the stable operation of the system.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the high-efficiency contact type anaerobic reactor and the method for treating the wastewater, which can improve the allowable range of the inlet water SS, and simultaneously meet the requirements of improving the wastewater treatment efficiency, reducing the outlet water SS and the like. By adopting the high-efficiency contact anaerobic reactor treatment method, the treatment effect is stable, the efficiency is high, the treatment cost is low, the management and operation are simple, and the SS of the treated effluent is greatly reduced. The method not only meets the treatment of the high-concentration and high-suspension pulping and papermaking wastewater, but also meets the requirements of high-concentration and high-suspension fermentation waste liquid such as fermentation and brewing.

The technical scheme of the invention is as follows:

a high-efficiency contact type anaerobic reactor comprises an anaerobic reactor main body, wherein the anaerobic reactor main body comprises a reaction area and a separation area, the reaction area is positioned at the front end of the anaerobic reactor, the separation area is positioned at the rear end of the anaerobic reactor, the reaction area is connected with the separation area through a water passing area, the reaction area is formed by connecting more than one reaction chambers in series, the separation area is provided with a built-in second-stage mud-water separation area through a support, the lower part of the separation area is provided with a first-stage mud collection area, the lower part of the built-in second-stage mud-water separation area is provided with a second-stage mud collection area, the lower side wall of the built-in second-stage mud-water separation area is provided with a water distribution port, the upper part of the built-in second-stage mud-water separation area is sequentially provided with a support frame 1#, a support frame 2#, a water outlet groove, a water outlet and a water discharge groove along the water outlet direction, a three-phase separator is arranged on the support frame 1#, a filler is arranged on the support frame 2#, the first-stage sludge collecting area and the second-stage sludge collecting area are respectively connected with a sludge pump.

According to the invention, preferably, the front end of the anaerobic reactor main body is provided with a water inlet pipe. Used for introducing the wastewater into the anaerobic reactor body.

According to the present invention, preferably, the reaction zone is composed of 1-6 reaction chambers connected in series; can be set according to the waste water quantity and the pollution load condition;

preferably, each reaction chamber is provided with a mechanical stirring device for uniformly stirring and mixing the wastewater and the anaerobic sludge so as to facilitate full reaction;

preferably, the upper part of each reaction chamber is provided with a gas collection chamber for collecting biogas generated by anaerobic reaction;

preferably, adjacent reaction chambers are separated by a retaining wall.

According to the invention, preferably, the water outlet groove is arranged on the inner side wall or the outer side wall of the rear end of the anaerobic reactor body.

According to the present invention, preferably, the material of the three-phase separator is glass fiber reinforced plastic, stainless steel or PP.

According to the invention, preferably, the filler is an inclined tube filler or an inclined plate filler; further preferably, the inclination angle of the filler is 45-78 degrees, and the vertical height of the filler is 200-1800 mm; more preferably, the material of the filler is selected from polypropylene, polyvinyl chloride, glass fiber reinforced plastic or stainless steel.

According to the invention, preferably, the volume load of the anaerobic reactor is up to 5-10 kgCOD/(m)³D)) the allowable range of the influent suspension can be as high as 1000 mg/L.

According to the invention, preferably, the primary sludge collecting area and the secondary sludge collecting area are connected with a sludge pump through sludge discharge pipes. For returning or discharging the sludge.

According to the present invention, preferably, the drainage channel is composed of a single drainage channel pipe or more than two drainage channel pipes; further preferably, the drainage system consists of 4-10 drainage channel pipelines.

According to the invention, the support is used for supporting the built-in secondary sludge-water separation area.

According to the invention, the method for treating wastewater by using the high-efficiency contact anaerobic reactor comprises the following steps:

the method comprises the steps of enabling waste water to be treated to enter an anaerobic reactor main body, enabling the waste water to be in contact reaction with anaerobic sludge, enabling the waste water to enter a separation area through a water area, enabling the sludge to be naturally settled and concentrated into a first-stage sludge collection area and to flow back to the front end of the anaerobic reactor main body through a sludge pump or to be discharged to a sludge treatment system, enabling supernatant to enter a built-in second-stage sludge-water separation area through a water distribution port, enabling the sludge to be naturally settled and concentrated into a second-stage sludge collection area and flow back to the front end of the anaerobic reactor main body through the sludge pump or to be discharged to the sludge treatment system after separation is completed through a three-phase separator and a filler, and enabling clear water to be collected into a water outlet groove and discharged through a water outlet and a water drainage groove.

The invention has not been described in detail, but is in accordance with the state of the art.

The invention has the beneficial effects that:

1. according to the invention, the mechanical stirring device is arranged in the high-efficiency anaerobic reactor main body, so that muddy water is fully contacted and mixed, the action of anaerobic microorganisms is exerted as far as possible, the anaerobic removal efficiency is greatly improved, the methane yield is also improved, and the recycling of methane energy also brings economic benefits for a sewage treatment system.

2. The invention sets a secondary sludge-water separation zone in the main body of the high-efficiency anaerobic reactor, the secondary sludge-water separation zone adopts the theory of high concentration and filler composite precipitation, the sewage entering the secondary sludge-water separation zone is separated by the filler, the sludge falls into a secondary sludge collection zone at the lower part of the filler, the sewage separated from the primary sludge collection zone directly enters the secondary sludge collection zone through a water distribution port at the lower side wall of the built-in secondary sludge-water separation zone, the sludge in the sewage collides, is adhered and adsorbed with the sludge with higher concentration in the sludge collection zone, and then the sludge in the sewage is intercepted in the sludge collection zone. The water after the sludge separation moves upwards, is further separated by a filler area and is discharged by a drainage system.

Not only saves land resources and pipeline and management cost, but also improves the allowable range of water inlet SS, improves the precipitation efficiency and reduces the water outlet SS. Pollutant in the waste water is efficiently removed in the system, suspended impurities in the water are precipitated in the inclined plate or inclined tube packing, the water flows upwards along the inclined plate or inclined tube packing, the separated sludge slides downwards to a sludge collecting area along the inclined plate or inclined tube packing under the action of gravity, and the deposition of sludge at the bottom of the tank and a sludge discharge pipeline is reduced.

3. The invention adopts the built-in secondary sludge-water separation area, solves the problem that the conventional anaerobic system requires low SS of inlet water, reduces the dosing cost of the pretreatment system at the early stage, saves the dosing cost of the sewage treatment system, greatly reduces the generation and treatment of sludge, and greatly saves valuable land resources.

4. The rear-end main body of the anaerobic reactor is provided with the two-stage sludge collection area, so that the sludge falling into the sludge collection area can be continuously, uniformly or intermittently discharged through the sludge discharge device, the sludge accumulation cannot be caused, and the continuous and stable operation of the system is ensured.

Drawings

FIG. 1 is a schematic structural view of the high-efficiency contact anaerobic reactor of the present invention.

Wherein: 1. the anaerobic reactor comprises an anaerobic reactor main body, 2, a water inlet pipe, 3, a mechanical stirring device, 4, a gas collection chamber, 5, a retaining wall, 6, a water passing zone, 7, a support, 8, a primary sludge collection zone, 9, a secondary sludge collection zone, 10, a water distribution port, 11, support frames 1#, 12, a three-phase separator, 13, support frames 2#, 14, a filler, 15, a water outlet groove, 16, a water outlet, 17, a water drainage groove, 18 and a sludge pump.

Detailed Description

The present invention is further illustrated by, but is not limited to, the following specific examples.

Example 1

A high-efficiency contact type anaerobic reactor is shown in figure 1, and comprises an anaerobic reactor body 1, wherein a water inlet pipe 2 is arranged at the bottom of the anaerobic reactor body 1, the anaerobic reactor body 1 comprises a reaction zone and a separation zone, the reaction zone and the separation zone are positioned at the front end and the rear end of the anaerobic reactor, the reaction zone and the separation zone are connected through a water passing zone 6, the reaction zone is formed by connecting two reaction chambers in series, and each reaction chamber is provided with a mechanical stirring device 3 for uniformly stirring and mixing waste water and anaerobic sludge so as to facilitate full reaction; the upper part of each reaction chamber is provided with a gas collection chamber 4 for collecting biogas generated by anaerobic reaction; the two reaction chambers are separated by a retaining wall 5; the separation area is provided with a built-in secondary sludge-water separation area through a support 7, the lower part of the separation area is provided with a primary sludge collection area 8, the lower part of the built-in secondary sludge-water separation area is provided with a secondary sludge collection area 9, the side wall of the lower part of the built-in secondary sludge-water separation area is provided with a water distribution port 10, the upper part of the built-in secondary sludge-water separation area is sequentially provided with a support frame 1#11, a support frame 2#13, a water outlet groove 15, a water outlet 16 and a water drainage groove 17 along the water outlet direction, the support frame 1#11 is provided with a three-phase separator 12, and the support frame 2#13 is provided with a filler 14; the first-stage sludge collecting area 8 and the second-stage sludge collecting area 9 are respectively connected with a sludge pump 18 through sludge discharge pipes;

the filler 14 is an inclined plate filler, the inclination angle of the filler 14 is 60 degrees, the vertical height of the filler 14 is 800mm, and the filler 14 is made of polyvinyl chloride.

The water outlet groove 15 is arranged on the inner side wall or the outer side wall of the rear end of the internally arranged anaerobic reactor body 1.

Example 2

A method of treating wastewater using the high efficiency contact anaerobic reactor of example 1, comprising the steps of:

wastewater to be treated enters an anaerobic reactor main body 1 through a water inlet pipe 2, anaerobic sludge is arranged in a reaction zone, the wastewater is uniformly mixed with the anaerobic sludge under the stirring action of a mechanical stirring device 3, the anaerobic sludge is completely contacted with the wastewater, generated methane rises and is collected in a gas collection chamber 4, the wastewater flows from a water passing zone 6 to a separation zone at the rear end, the sludge is naturally settled and concentrated to a primary sludge collection zone 8, and the sludge flows back to the front end of the anaerobic reactor main body 1 through a sludge pump 18 or is discharged to a sludge treatment system; supernatant enters a built-in secondary sludge-water separation zone through a water distribution port 10, after separation is completed by a three-phase separator 12 and a filler 14, sludge is naturally settled and concentrated in a secondary sludge collection zone 9, and flows back to the front end of the anaerobic reactor body 1 through a sludge pump 18 or is discharged to a sludge treatment system, and clear water is collected in a water outlet tank 15 and is discharged through a water outlet 16 and a water discharge tank 17.

Example 3

As described in example 1, except that:

the filler 14 is an inclined tube made of polypropylene, the inclination angle is set to be 75 degrees, and the vertical height of the filler 14 is 1500 mm.

Example 4

As described in example 1, except that:

the filler 14 is an inclined tube made of glass fiber reinforced plastic, the inclination angle is set to be 60 degrees, and the vertical height of the filler 14 is 200 mm.

Comparative example 1

An upflow anaerobic reactor treatment system, wherein wastewater enters an anaerobic reactor for anaerobic treatment, water inlet SS is strictly controlled, otherwise, the continuous long-term operation easily causes the problems of system blockage, treatment effect reduction, sludge leakage, water outlet SS rising and the like, and the system cannot continuously and stably operate and cannot meet the requirement of discharge standard.

Comparative example 2

The integrated anaerobic reactor disclosed in patent document CN201258280Y is used for treating wastewater, and the middle section adopts an up-flow type, and is not provided with a built-in secondary sludge-water separation zone.

Test example 1

The wastewater treatment methods in example 1 and comparative examples 1 to 2 were each subjected to an effect test.

The sewage to be treated is high-suspended matter concentration wastewater after physical and chemical treatment, the concentration of suspended matters in the wastewater is 1500mg/L, the tests are respectively carried out according to the methods of example 1 and comparative examples 1-2, and the test data are detailed in Table 1.

TABLE 1

Item	Example 1	Comparative example 1	Comparative example 2
				Anaerobic influent suspended matter mg/L	1500	1500	1500
Anaerobic effluent suspended matter mg/L	260	800	750
				Whether or not to block	Can not	Often times, the heat exchanger is not used for heating	Sometimes, the pressure is increased
Stability in handling	Stabilization	Is very unstable	Is not too stable
				Processing the request	Satisfy the requirement of	Not meet the requirements of	Not meet the requirements of

The sewage to be treated is high-pollution load wastewater after physicochemical treatment, the COD value in the wastewater is 8000mg/L, the tests are respectively carried out according to the methods of example 1 and comparative examples 1-2, and the test data are detailed in Table 2.

TABLE 2

Item	Example 1	Comparative example 1	Comparative example 2
				Water inlet COD (mg/L) before treatment	8000	8000	8000
COD (mg/L) of the effluent after treatment	2200	3200	2400
				Stability of operation treatment	Stabilization	Is very unstable	Basic stabilization

As can be seen from the data in Table 1, the treatment method of the high-efficiency contact anaerobic reactor can meet the requirement of wastewater treatment with high suspended matter concentration, and solves the problem that the common anaerobic reactor requires low concentration (generally not higher than 400mg/L) of the suspended matter of the inlet water.

As can be seen from the data in Table 2, the treatment method of the high-efficiency contact anaerobic reactor can more stably and better treat the wastewater with high pollution load and higher SS, solves the problem that the common anaerobic reactor needs to dilute the wastewater with high pollution load by the return secondary sedimentation water, reduces the dilution, greatly reduces the floor area, reduces the aerobic biochemical treatment capacity and improves the treatment efficiency.

Through tables 1 and 2, compared with the integrated high-efficiency anaerobic reactor disclosed in CN201258280Y, the invention has wider accommodation range for the SS of the inlet water, can allow the waste water with higher SS to directly enter, and has more stable treatment effect.

Claims

1. A high-efficiency contact type anaerobic reactor is characterized by comprising an anaerobic reactor main body, wherein the anaerobic reactor main body comprises a reaction area and a separation area, the reaction area is positioned at the front end of the anaerobic reactor, the separation area is positioned at the rear end of the anaerobic reactor, the reaction area is connected with the separation area through a water passing area, the reaction area is formed by connecting more than one reaction chambers in series, the separation area is provided with a built-in secondary mud-water separation area through a support, the lower part of the separation area is provided with a primary mud collection area, the lower part of the built-in secondary mud-water separation area is provided with a secondary mud collection area, the lower side wall of the built-in secondary mud-water separation area is provided with a water distribution port, the upper part of the built-in secondary mud-water separation area is sequentially provided with a support frame 1#, a support frame 2#, a water outlet groove and a water outlet groove, a water outlet groove and a water discharge groove along the water outlet direction, and the support frame 1#, the support frame 2# on be provided with the filler, first-stage sludge collection district and second grade sludge collection district connect the sludge pump respectively.

2. The anaerobic reactor according to claim 1, characterized in that the front end of the anaerobic reactor body is provided with a water inlet pipe.

3. The high efficiency contact anaerobic reactor according to claim 1, wherein the reaction zone consists of 1-6 reaction chambers connected in series;

preferably, each reaction chamber is provided with a mechanical stirring device.

4. The high-efficiency contact anaerobic reactor according to claim 1, wherein the upper part of each reaction chamber is provided with a gas collection chamber.

5. The anaerobic reactor according to claim 1, wherein adjacent reaction chambers are separated by a retaining wall.

6. The anaerobic reactor according to claim 1, wherein the water outlet groove is arranged on the inner side wall or the outer side wall of the back end of the anaerobic reactor body.

7. The anaerobic reactor according to claim 1, wherein the material of the three-phase separator is glass fiber reinforced plastic, stainless steel or PP.

8. The anaerobic reactor according to claim 1, characterized in that the packing is a tube packing or a plate packing;

preferably, the inclination angle of the filler is 45-78 degrees, and the vertical height of the filler is 200-1800 mm;

preferably, the material of the filler is selected from polypropylene, polyvinyl chloride, glass fiber reinforced plastics or stainless steel.

9. The anaerobic reactor according to claim 1, wherein the drainage channel is composed of a single drainage channel pipe or more than two drainage channel pipes;

preferably, the drainage system consists of 4-10 drainage channel pipelines.

10. A method of treating wastewater comprising using the high efficiency contact anaerobic reactor of claim 1, comprising the steps of: