CN104843902A - Integrated biological vector dephosphorizing reactor - Google Patents

Abstract

The invention discloses an integrated biological mediator phosphorus removal reactor. The reactor body is equipped with a water distribution area, a reaction area and a sedimentation area in sequence from bottom to top. The lower part of the water distribution area is equipped with a slag outlet and a sludge bucket. The water distribution area is equipped with an aeration device, a reflector and a ring distributor. , the aeration device includes an aeration tube, an aeration head, and the annular distributor includes a distribution plate and a distribution column; the reaction area is sequentially provided with a first reaction area, a central pipe, and a second reaction area from the inside to the outside, and the upper part of the first reaction area There are water inlet pipes, drug inlet pipes, expansion pipes at the bottom, material outlets at the lower part of the second reaction zone, and material inlets at the upper part; water outlet weirs and outlet pipes are provided in the sedimentation area, and sawtooth-shaped overflow weir. The invention integrates flocculation, adsorption and crystallization for phosphorus removal, and the functions of each unit are complementary, and the structure is compact, and the floor area is small; the gravity self-flowing is rapid flocculation, and the carrier area is slowly crystallized, which improves the efficiency of phosphorus removal and crystallization; the phosphorus in the product High content.

Description

Integrated biological mediator phosphorus removal reactor

technical field

The invention relates to a reactor for treating phosphorus-containing wastewater, in particular to an integrated biological mediator phosphorus removal reactor.

Background technique

my country's water bodies are seriously polluted, among which eutrophication pollution has caused ecological balance damage and a decline in drinking water quality, which has had a major impact on human life and production. Phosphorus is the main limiting factor causing water eutrophication. In recent years, on the one hand, phosphorus-containing wastewater has been increasing, causing environmental pollution and ecological damage; on the other hand, phosphorus resources tend to be exhausted due to large-scale mining. It is estimated that according to the current mining speed, the global phosphate rock resources can only last for 100-250 years. Therefore, phosphorus removal from wastewater and its resource recycling have become a major issue in the field of environment and resources.

Biological phosphorus removal is a commonly used wastewater phosphorus removal technology, but it has high requirements for wastewater components, low phosphorus removal rate, poor operation stability and flexibility, large amount of residual sludge and difficult disposal. Chemical precipitation phosphorus removal method is another important wastewater phosphorus removal technology. It has been found that the traditional chemical precipitation phosphorus removal method has disadvantages such as slow precipitation speed, poor solid-liquid separation, high sludge moisture content, and low sludge phosphorus content. Chemical crystallization phosphorus removal methods mainly include struvite (MAP) crystallization method and calcium carbonate (HAP) crystallization method. These methods can not only remove phosphorus, but also recover phosphorus, and are favored by academia and industry. However, the chemical crystallization phosphorus removal method is complex in operation and high in operating costs. So far, most researches are still at the laboratory level, and there are few engineering applications.

Combining the chemical precipitation phosphorus removal method with the crystallization phosphorus removal method, and using the interception, adsorption, and crystallization effects of the modified excess sludge (biological mediator), the development of a reactor integrating phosphorus removal and phosphorus recovery not only strengthens the The phosphorus removal effect of wastewater has realized the recovery of phosphorus resources, and the use of biological mediators as crystal nuclei has eased the pressure on excess sludge disposal.

Contents of the invention

The purpose of the invention is to overcome the deficiencies of the prior art and provide an integrated biological mediator phosphorus removal reactor.

The body of the integrated biological mediator phosphorus removal reactor is provided with a water distribution area, a reaction area and a precipitation area in sequence from bottom to top. The center of the reaction area and the precipitation area is provided with a central tube, and the lower end of the central tube is provided with an expansion tube for water distribution. The area is equipped with slag outlet, sludge hopper, aeration device, reflection plate and ring distributor in sequence from bottom to top. Aeration device includes aeration pipe, aeration head, and ring distributor includes distribution plate and distribution column. The reaction area is provided with the first reaction area and the second reaction area in sequence from the inside to the outside, extending from the upper third of the central tube to the expansion tube is the first reaction area, and the inner side of the upper part of the central tube is equipped with a water inlet pipe and a drug feeder. The upper part of the second reaction zone is provided with a material inlet, and the lower part is provided with a material outlet. The first reaction zone and the second reaction zone are connected through an annular distributor. The sedimentation zone is provided with a water outlet weir and an outlet pipe. There is a sawtooth overflow weir.

The diameter-to-height ratio of the reactor is 3-5, and the volume ratio of the water distribution area, the reaction area and the precipitation area is 1: 3-6: 2-4. The first reaction zone and the second reaction zone are concentric cylinders with equal heights; the ratio of the cross-sectional area of the first reaction zone to the second reaction zone is 1:10~30. The aeration head is located directly below the reflector, the reflector is located directly below the expansion tube, the distance is 10-30mm, and the diameter of the reflector is 1.3-1.8 times the diameter of the expansion port. The distribution plate is connected and fixed with the expansion tube, and is 20-30° from the horizontal line. The lowest point is 50-150mm from the bottom of the reactor. A distribution column with a height of 40~80mm is vertically installed in the hole, the bottom of the distribution column is open, the upper end is closed, and small holes of φ10~20mm are evenly opened on the side. The water inlet pipe and drug inlet pipe are located at the upper center of the first reaction zone.

Compared with the prior art, the present invention has beneficial effects: 1) The reactor is divided into three units from bottom to top: water distribution area, reaction area and precipitation area, and the adjacent units have complementary functions, compact structure, and small footprint; 2) The reaction zone is divided into the first reaction zone and the second reaction zone, which integrates flocculation, adsorption and crystallization for phosphorus removal; 3) The second reaction zone is equipped with biological mediators to accelerate the process of adsorption and crystallization, while improving Crystalline phosphorus content; 4) The annular distributor distributes water evenly; 5) The overflow weir in the sedimentation area adopts a zigzag weir to ensure uniform flow in the sedimentation area.

Description of drawings

Fig. 1 is a structural schematic diagram of an integrated phosphorus removal reactor;

Figure 2 is a sectional view of the structure A-A of the integrated phosphorus removal reactor

In the figure: slag outlet 1, sludge hopper 2, aeration pipe 3, aeration head 4, reflection plate 5, distribution plate 6, distribution column 7, first reaction zone 8, expansion pipe 9, central pipe 10, inlet Water pipe 11, drug inlet pipe 12, feed pipe 13, material outlet 14, second reaction zone 15, overflow weir 16, water outlet pipe 17.

Detailed ways

As shown in Figures 1 and 2, the body of the integrated biological mediator phosphorus removal reactor is sequentially provided with water distribution area I, reaction area II and precipitation area III from bottom to top, and the center of reaction area II and precipitation area III is set The central pipe 10, the lower end of the central pipe 10 is provided with an expansion pipe 9, and the water distribution area I is provided with a slag outlet 1, a sludge bucket 2, an aeration device, a reflector 5 and an annular distributor in order from bottom to top, and the aeration The device includes an aeration tube 3 and an aeration head 4. The annular distributor includes a distribution plate 6 and a distribution column 7. The reaction zone II is sequentially provided with a first reaction zone 8 and a second reaction zone 15 from the inside to the outside. One-third of the upper part of the 10 extends to the expansion tube 9, which is the first reaction zone 8, and the inner side of the upper part of the center tube 10 is provided with a water inlet pipe 11 and a medicine feeding pipe 12. There is a discharge port 14, the first reaction zone 8 and the second reaction zone 15 are connected through an annular distributor, the sedimentation zone III is provided with a water outlet weir and a water outlet pipe 17, and a zigzag overflow weir 16 is provided on the upper part of the water outlet weir.

The diameter-to-height ratio of the reactor is 3-5, and the volume ratio of the water distribution zone I, the reaction zone II and the precipitation zone III is 1: 3-6: 2-4. The first reaction zone 8 and the second reaction zone 15 are concentric cylinders with equal heights; the ratio of the cross-sectional area of the first reaction zone 8 to the second reaction zone 15 is 1: 10 ~ 30. The aeration head 4 is located directly below the reflecting plate 5, and the reflecting plate 5 is located directly below the expansion tube 9, with a distance of 10-30mm. The diameter of the reflecting plate 5 is 1.3-1.8 times the diameter of the expanding port 9. The distribution plate 6 is connected and fixed with the expansion tube 9, and is 20-30° from the horizontal line. The lowest point is 50-150mm from the bottom of the reactor. 200 distribution columns 7 with a height of 40-80mm are vertically installed in the holes. The bottom of the distribution columns 7 is open, the upper end is closed, and small holes of φ10-20mm are evenly opened on the side. The water inlet pipe 11 and the drug inlet pipe 12 are located at the upper center of the first reaction zone 8 .

An integrated biological mediator phosphorus removal reactor can be made of PVC board and steel plate, and its working process is as follows: firstly, the carrier is loaded through the feed port 13, and the large-sized crushed stone or glass balls are first filled to the height of the distribution column 7, and then Fill the pretreated biological carrier to a distance of about 30-80mm from the feed port 13; the water inlet pipe 11 and the drug inlet pipe 12 are fed with water and medicine at the same time, and are fully mixed in the first reaction zone 8. The flocculation and phosphorus removal reaction is carried out in zone 8; the sediment produced by the reaction partly enters the bottom sludge hopper 2 and is discharged through the slag discharge port 1, and part of the sediment flows upward through the reflection plate 5 and aeration with the water flow, and passes through the annular distributor After uniform water distribution, it enters the second reaction zone 15; due to the increase in cross-sectional area of the second reaction zone 15, the water flow velocity slows down in the second reaction zone 15, fully contacts with the biological carrier, carries out adsorption and crystallization reaction, and intercepts suspended solids, Solid-liquid separation is carried out; the effluent from the second reaction zone 15 is settled and separated in the precipitation zone III, and the effluent after clarification is discharged through the overflow weir 16 and the water outlet pipe 17.

The key to the phosphorus removal and crystallization recovery of the reactor in the present invention lies in flow rate control. Through the proportion design of the cross-sectional area of the first reaction zone 8 and the second reaction zone 15, the rapid flocculation and dephosphorization of the influent in the first reaction zone 8 is controlled. Slowly flow upward in the reaction zone 15 to achieve the effect of adsorption and crystallization for phosphorus removal.

Claims (6)

1. An integrated biological mediator phosphorus removal reactor, characterized in that: the reactor body is provided with a water distribution area (I), a reaction area (II) and a precipitation area (III) sequentially from bottom to top, and the reaction area (II) and the center of the sedimentation area (III) are provided with a central pipe (10), and the lower end of the central pipe (10) is provided with an expansion pipe (9), and the water distribution area (I) is sequentially provided with slag outlets from bottom to top (1), sludge hopper (2), aeration device, reflection plate (5) and annular distributor, the aeration device includes aeration pipe (3), aeration head (4), and the annular distributor includes a distribution plate ( 6) and the distribution column (7), the reaction zone (II) is provided with the first reaction zone (8) and the second reaction zone (15) sequentially from the inside to the outside, from the upper third of the central tube (10) Extending to the expansion tube (9) is the first reaction zone (8), the inner side of the upper part of the center tube (10) is provided with a water inlet pipe (11) and a drug inlet pipe (12), and the upper part of the second reaction zone (15) is provided with a feed outlet (13), the lower part is provided with a discharge port (14), the first reaction zone (8) and the second reaction zone (15) are connected through an annular distributor, and the sedimentation zone (III) is provided with a water outlet weir and a water outlet pipe ( 17), the upper part of the outlet weir is provided with a zigzag overflow weir (16). 2. An integrated biological mediator phosphorus removal reactor according to claim 1, characterized in that: the diameter-to-height ratio of the reactor is 3~5, the water distribution area (I), the reaction area (II) and The volume ratio of the precipitation zone (III) is 1 : 3~6 : 2~4. 3. An integrated biological mediator phosphorus removal reactor according to claim 1, characterized in that: the first reaction zone (8) and the second reaction zone (15) are concentric cylinders, and the height of both is Equal; the ratio of the cross-sectional area of the first reaction zone (8) to the second reaction zone (15) is 1: 10~30. 4. An integrated biological mediator phosphorus removal reactor according to claim 1, characterized in that: the aeration head (4) is located directly below the reflection plate (5), and the reflection plate (5) is located in the expansion tube Directly below (9), the distance is 10-30mm, and the diameter of the reflecting plate (5) is 1.3-1.8 times the diameter of the expansion port (9). 5. An integrated biological mediator phosphorus removal reactor according to claim 1, characterized in that: the distribution plate (6) is connected and fixed with the expansion tube (9), and is 20~30° from the horizontal line, the minimum The distance from the point to the bottom of the reactor is 50~150mm. The distribution plate (6) has circular holes of φ2~10mm, 50~200 per unit area, and the distribution column (7) with a height of 40~80mm is vertically installed in the hole. The lower part of the post (7) is open, the upper end is closed, and small holes of φ10-20mm are evenly opened on the side. 6. An integrated biological mediator phosphorus removal reactor according to claim 1, characterized in that: the water inlet pipe (11) and the drug inlet pipe (12) are located in the upper center of the first reaction zone (8).