CN101402487A - Water treatment system in two-stage moving bed biomembrane reactor - Google Patents

Abstract

The invention belongs to the field of water treatment and relates to a water treatment system in a two-stage moving bed biofilm reactor. It is characterized in that the whole process adopts programmable PLC automatic control system, and the main processing structure is a two-stage series moving bed biofilm reactor. The lifting sequence enters the first and second MBBR reactors, and then the effluent enters the clear water tank in the sedimentation tank, and then is sterilized by circulating ultraviolet light and reused for toilet flushing and landscape water. The advantages of the invention are: 1. Good reclaimed water treatment effect, strong impact load resistance and stable effluent quality. 2. Simple operation and management, small footprint, convenient maintenance, and less residual sludge; PLC automatic control system is adopted, with a high degree of automation. 3. The mechanical aeration method is adopted, with low energy consumption and good oxygenation performance, and there is no need to set up blower equipment separately. 4. The cycle ultraviolet ray sterilization method is adopted, and there is no need to add chemicals in the whole process, which can avoid the occurrence of secondary pollution. 5. Wide range of applications.

Description

Water treatment system in a two-stage moving bed biofilm reactor

technical field

The invention belongs to the field of water treatment, and relates to a reclaimed water treatment system of a biological process, specifically a two-stage moving bed biofilm reactor (MBBR) reclaimed water treatment system.

Background technique

Reclaimed water mainly refers to non-potable miscellaneous water that can be reused within a certain range after urban sewage or domestic sewage has been treated to meet certain water quality standards, and its water quality is between that of upper water and sewage. At present, China is already the 13th water-poor country in the world. Water resources are very scarce. More than 400 cities are in a state of water shortage. A lot of inconvenience came. At the same time, a large amount of sewage discharge not only causes serious environmental pollution, but also wastes precious water resources. In today's increasingly scarce water resources, returning the treated water to greening, flushing vehicles and flushing toilets is an effective form of recycling sewage, and its application prospects are very broad.

In some existing reclaimed water treatment processes, the main treatment units are mostly coagulation sedimentation, air flotation or contact oxidation, membrane bioreactor, etc., according to literature (Industrial Safety and Environmental Protection, 2006, 32[6], 17) and literature (Journal of Nanjing Institute of Engineering, 2005, 3[4], 65) reported that they have disadvantages such as poor resistance to impact load, easy to block, unstable effluent quality, etc., which affect the quality of reclaimed water treatment. At the same time, the operation and maintenance costs High energy consumption and other factors also restrict the application of reclaimed water treatment equipment. On the other hand, its disinfection methods are mainly chlorine disinfection, ozone disinfection, chloramine disinfection and chlorine dioxide disinfection, and there is a risk of secondary pollution while adding drugs for disinfection.

Contents of the invention

The purpose of the present invention is to provide a reclaimed water treatment process with high degree of automation, small floor space, convenient maintenance, less residual sludge, and stable effluent quality; the whole process does not need to add chemicals, which can avoid the occurrence of secondary pollution.

A two-stage moving bed biofilm reactor water treatment system, characterized in that the process flow is as follows: domestic sewage enters the regulating tank 2 through the grid 1, is lifted by the submersible pump 8 and enters the first-stage MBBR reactor 3, and in the first-stage MBBR In the reactor 3, the mechanical surface aeration 10 is adopted to make the reactor in an aerobic state, and the multi-faceted hollow spherical filler 12 is added, and the suspended activated sludge and the biofilm attached to the filler coexist, except for the removal of organic matter and ammonia nitrogen. , the formation of facultative oxygen and anaerobic layers inside the biofilm can simultaneously remove nitrogen and phosphorus. The effluent enters the secondary MBBR reactor 4 as a gravity flow, and the cylinder outer screw 13 is added to the pool, and the rotating cage type aeration device 11 is used to further remove organic matter, nitrogen, and phosphorus, and make the process of the present invention have a strong impact load resistance ability. The effluent from the secondary MBBR reactor still enters the sedimentation tank 5 through gravity flow, and then overflows into the clear water tank 6, and then passes through the circulating ultraviolet disinfection device 8 to remove pathogenic microorganisms and then reuse it for toilet flushing and landscape water. The whole process adopts programmable PLC automatic control system.

The upper part of the above-mentioned secondary MBBR reactor pool body is a cuboid, the lower part is a semi-cylindrical body, the bottom is provided with a mud discharge port, and a rotating cage aeration device is used. The tank is provided with suspended fillers, and biofilms are attached to the fillers; The water outlets of the primary and secondary MBBR reactors are equipped with a mesh screen 18 with a slightly smaller pore size, which can retain the carrier and suspended sludge; according to the difference in water quality and water volume, the secondary MBBR reactor can be used alone or It can be used in parallel connection of 2-5.

The above-mentioned clean water pool is provided with a submersible pump 9, which circulates treated reclaimed water into the ultraviolet disinfection device; the ultraviolet disinfection device is several parallel ultraviolet lamp tubes.

The above-mentioned programmable PLC automatic control system can automatically control the height of the liquid level, the operation of the submersible pump, the aeration time, and the disinfection device.

In summary, compared with the previous reclaimed water treatment process, the present invention has the following advantages:

1) The reclaimed water treatment effect is good. In the moving bed biofilm reactor (MBBR) adopted in the present invention, the suspended activated sludge and the attached biofilm coexist. In addition to removing organic matter and ammonia nitrogen, the formation of facultative and anaerobic layers inside the biofilm can simultaneously remove nitrogen and denitrification. phosphorus. In addition, the use of two-stage MBBR makes this process have a strong ability to resist impact loads, and the effluent water quality is stable.

2) Easy operation and management. The MBBR process is adopted, which occupies a small area, is easy to maintain, and has a small amount of residual sludge; it adopts a PLC automatic control system with a high degree of automation.

3) The present invention adopts a mechanical aeration method, which has low energy consumption, can make the carrier present a good fluidization state, has good oxygenation performance, and does not need a separate blower device.

4) The cyclic ultraviolet sterilization and disinfection method can ensure the stability of the effluent water quality. There is no need to add chemicals in the whole process, which can avoid the occurrence of secondary pollution.

5) It has a wide range of applications, and can flexibly change the series-parallel connection mode and size of MBBR reactors according to the treatment requirements and the treatment water quality.

Description of drawings

Fig. 1 is a process flow diagram of the present invention

Fig. 2 is a schematic diagram of a process device of the present invention

Fig. 3 is a schematic diagram of a primary MBBR reactor device of the present invention

Fig. 4 is the front view of the secondary MBBR reactor device of the present invention

Fig. 5 is the side view of secondary MBBR reactor device of the present invention

Detailed ways

As shown in Figures 1 and 2, the domestic sewage enters the regulating tank 2 through the grid 1, and then enters the first-level MBBR reactor 3 and the second-level MBBR reactor 4 in sequence through the pump 8, and then the effluent overflows into the clear water in the sedimentation tank 5 The pool 6 is reused after passing through the circulating ultraviolet disinfection device 7. Depending on the quality and quantity of treated water, the secondary MBBR reactor 4 can be connected in multiple parallel ways.

As shown in Fig. 4 and Fig. 5, the upper part of the secondary MBBR reactor pool body is a cuboid, the lower part is a semi-cylindrical body, and the bottom is provided with a mud discharge port, and the rotating cage type aeration device 14 (rotating cage), 16 ( motor), 17 (chain), the pool is provided with suspended filler 15, with biofilm attached on the filler; the water outlet of the reactor is provided with a mesh screen 18 with a slightly smaller aperture size to retain carrier and suspended sludge.

Implementation example

As shown in Figure 2, the domestic sewage enters the regulating tank 2 through the grid 1, and is lifted into the primary MBBR reactor 3 by the submersible pump 8. In the primary MBBR reactor 3, the mechanical surface aeration 10 is adopted to make the reactor In an aerobic state, multi-faceted hollow sphere filler 12 is added, and the suspended activated sludge and the biofilm attached to the filler coexist. In addition to removing organic matter and ammonia nitrogen, the facultative and anaerobic layers formed inside the biofilm can simultaneously remove nitrogen and nitrogen. phosphorus. The effluent enters the secondary MBBR reactor 4 as a gravity flow, and the cylinder outer screw 13 is added to the pool, and the rotating cage type aeration device 11 is used to further remove organic matter, nitrogen, and phosphorus, and make the process of the present invention have a strong impact load resistance ability. The effluent still enters the sedimentation tank 5 through gravity flow, and then overflows into the clear water tank 6, and then passes through the circulating ultraviolet disinfection device 8 to remove pathogenic microorganisms and reuse it for flushing toilets and landscape water. Since the amount of residual sludge in the process of the present invention is small, there is no need to return the sludge. After the treatment of the above processes, the indicators of the effluent are better than the requirements of the national recycling standard.

Claims (4)

1. water treatment system in the two-stage moving bed biomembrane reactor, it is characterized in that technical process is: sanitary sewage enters equalizing tank (2) through grid (1), enter one-level MBBR reactor (3) through submersible pump (8) lifting, in one-level MBBR reactor (3), adopt mechamical xurface aeration (10) mode, make reactor be in oxygen condition, add multiaspect hollow ball filler (12), the microbial film coexistence of adhering on active sludge that suspends and the filler, except removing organism and ammonia nitrogen, inner hold concurrently oxygen and the anaerobic layer energy while denitrogenation dephosphorizing of forming of microbial film; Water outlet is that gravity flows to into secondary MBBR reactor (4), adds cylinder external spiral (13) in the pond, adopts rotating cage type aerating apparatus (11), further removes organism, nitrogen, phosphorus; The water outlet of secondary MBBR reactor still enters clean water basin (6) for gravity flows to into the overflow of settling tank (5) back, again by carrying out reuse behind round-robin apparatus for ultraviolet disinfection (8) the removal pathogenic micro-organism, is used to flush the toilet, landscape water; Technology whole process using programmable PLC automatic control system.

2. water treatment system in a kind of two-stage moving bed biomembrane reactor as claimed in claim 1, it is characterized in that secondary MBBR reactor cell body top is rectangular parallelepiped, the lower section is a semicylinder, the bottom is provided with mud discharging mouth, adopt the rotating cage type aerating apparatus, be provided with floating stuffing in the pond, have microbial film on the filler; The water outlet of firsts and seconds MBBR reactor is equipped with a small-bore mesh screen (18), can hold back carrier and suspended sludge; Different according to the water quality treatment and the water yield can singlely be used, and can adopt 2--5 mode in parallel to use again.

3. water treatment system in a kind of two-stage moving bed biomembrane reactor as claimed in claim 1 is characterized in that being provided with in the clean water basin submersible pump (9), with squeezing in the apparatus for ultraviolet disinfection of the middle water cycle after handling; Apparatus for ultraviolet disinfection is a 2-8 quartz burner in parallel.

4. water treatment system in a kind of two-stage moving bed biomembrane reactor as claimed in claim 1 is characterized in that the programmable PLC automatic control system can control automatically to height, the running of submersible pump, aeration time, the sterilizing unit of liquid level.

Images