CN102167472B - A combined MBR sewage treatment and reuse device for offshore platforms - Google Patents

Abstract

The invention relates to a combined MBR sewage treatment and reuse device for an offshore platform. The invention belongs to the technical field of environmental engineering. A combined MBR sewage treatment and reuse device for an offshore platform includes three boxes, the box I is a grease trap, and an oil retaining partition and an oil skimmer are arranged in the grease trap, and there is a water outlet connected to the regulating pool; The body II is divided into a septic tank and a regulating tank, the upper part of the septic tank is provided with an outlet pipe connected to the regulating tank, the regulating tank is provided with a coarse grille and an overflow pipe, and the bottom is provided with a submersible sewage pump and a water outlet pipe; A hydrolytic acidification pool and an MBR pool are installed in the Ⅲ. A fine grid is arranged inside the hydrolytic acidification pool. The upper part is provided with an outlet pipe connected to the MBR pool. The MBR membrane module is placed in the MBR pool, and the upper water collection pipe is connected to the reclaimed water pump. The aeration pipe is communicated with the air blower. The invention has the advantages of simple structure, high efficiency and energy saving, continuous and stable operation, fast assembly, automatic control, convenient operation and the like.

Description

A combined MBR sewage treatment and reuse device for offshore platforms

technical field

The invention belongs to the technical field of environmental engineering, in particular to a combined MBR sewage treatment and recycling device for offshore platforms.

Background technique

Offshore oil production platform groups generally have at least one staff life support system, and this system is embodied in the life module. The domestic sewage of the platform mainly has the following sources in the living module: 1. Toilet discharge water; 2. Bath discharge water; 3. Washing discharge water; 4. Kitchen discharge water; 5. Central air-conditioning discharge water. With the development of offshore oil, more and more attention has been paid to the pollution of marine environment by domestic sewage on offshore platforms.

Traditional platform domestic sewage treatment methods are mainly divided into three categories according to different principles: physical chemical method, biochemical method and electrolytic method. At present, domestic sewage treatment devices for biochemical, physical and chemical methods and electrolytic methods have been commercialized in my country, but there are some shortcomings in terms of device volume, types of treated sewage, and performance. The physicochemical method has small volume, low running and no-load mass, and convenient operation; however, with the addition of a large amount of chemicals, the operating cost is high, the device is easy to block, and needs to be cleaned regularly. The biochemical method has low investment and low operating costs, and is the most widely used. However, the device is bulky, the platform after construction is inconvenient to install, the sewage type is single, the shock load resistance is poor, and regular cleaning is required. The electrolysis method has the advantages of small size, small operation and no-load mass, comprehensive types of sewage treatment, system startup at any time, and simple operation and maintenance, but the one-time investment is large and the operating cost is high.

In response to the current society's demand for pollutant emission reduction and reclaimed water reuse, improving the utilization rate of water in daily life, especially increasing the reuse rate of water is the main way to save water.

Contents of the invention

The invention provides a combined MBR sewage treatment and recycling device for offshore platforms to solve the technical problems in the known technology.

The purpose of the present invention is to provide a device with simple structure, high efficiency and energy saving, convenient installation, zero emission, continuous and stable operation, fast and efficient, fast assembly, light and beautiful box body, high biomass concentration maintenance, automatic control, and convenient operation and management. Combined MBR sewage treatment and reuse device for offshore platforms with the same characteristics.

The technical solution taken by the combined MBR sewage treatment and reuse device for the offshore platform of the present invention to solve the technical problems existing in the known technology is:

The combined MBR sewage treatment and reuse device for offshore platforms is characterized by: the sewage treatment and reuse device includes three boxes, the box I is a grease trap, and an oil retaining baffle and an oil skimmer are installed in the grease trap. There is a water outlet connected to the regulating tank; a septic tank and a regulating tank are arranged separately in the box body II, and partitions and openings are arranged in the septic tank, and an outlet pipe connected to the regulating tank is arranged on the upper part of the septic tank, and a coarse water pipe is arranged in the regulating tank Grilles, overflow pipes, submersible sewage pumps and outlet pipes connected to the submersible sewage pumps are installed at the bottom of the regulating tank; a hydrolytic acidification tank and an MBR tank are arranged separately in the tank III, and a fine grid is arranged in the hydrolytic acidification tank, and the top of the hydrolysis acidification tank There is an outlet pipe connected to the MBR tank at the bottom, and the MBR membrane module is placed in the MBR tank. There is a water collection pipe on the upper part of the membrane module.

The combined MBR sewage treatment and reuse device for the offshore platform of the present invention can also adopt the following technical solutions:

The combined MBR sewage treatment and reuse device for offshore platforms is characterized in that an equipment room is separately arranged in the box body II, and a blower and a reclaimed water pump are arranged in the equipment room.

The combined MBR sewage treatment and reuse device for offshore platforms is characterized in that: the tank I is connected to the regulating tank of the tank II through the pipeline, and the regulating tank of the tank II is connected to the tank III through the submersible sewage pump and the pipeline The hydrolytic acidification pool is connected.

The combined MBR sewage treatment and reuse device for offshore platforms is characterized in that: the box body II and the box body III are connected by connecting pieces.

The combined MBR sewage treatment and reuse device for offshore platforms is characterized in that: the upper part of the hydrolytic acidification tank is provided with an overflow pipe connected with the regulating tank.

The combined MBR sewage treatment and reuse device for offshore platforms is characterized in that: the overflow pipe in the adjustment pool is in the shape of a trumpet, and the outlet pipe of the overflow pipe is provided with a trap with a cleaning port.

The combined MBR sewage treatment and reuse device for offshore platforms is characterized in that: 1 to 4 sets of MBR membrane modules are placed in the MBR pool.

The combined MBR sewage treatment and recycling device for offshore platforms is characterized in that it adopts high-strength stamped steel plates and is combined and installed on site.

The advantages and positive effects that the present invention has are:

Compared with the existing technology, the combined MBR sewage treatment and reuse device for offshore platforms has the following characteristics due to the adoption of the new technical solution of the present invention:

According to the characteristics of domestic sewage water quality and water quantity, the invention designs toilet discharge water (black water) to enter the septic tank and enter the adjustment tank after treatment; kitchen discharge water enters the grease trap and enters the adjustment tank after treatment; other discharge water enters the adjustment tank . The domestic sewage enters the biochemical treatment unit after the above pretreatment, which overcomes the unevenness of sewage production and water quality, ensures that the biochemical treatment system can run stably and continuously for a long time, and exerts a fast, stable and efficient treatment effect. At least 2 sets of membrane modules are installed in parallel in the MBR pool, and the number of operating membrane modules is selected according to the number of people on the platform, which increases the load resistance capacity of the MBR pool.

The upper part of the hydrolytic acidification tank of the present invention is provided with an overflow pipe connected with the adjustment tank, and the inside of the adjustment tank is provided with a "horn" overflow port. The flow to the regulating tank reduces the chance of sewage overflow and discharge, and the overflow design is more reasonable.

The invention adopts a high-strength stamped steel box structure, and the evenly distributed tension bars in the box make the box body bear pressure evenly, and the overall structure is unique and reasonable. The standard stamping plate can be combined and assembled at will, and assembled on site without hoisting equipment. The construction is convenient and fast, and the box is light and beautiful, which overcomes the limitation of the platform size on the sewage treatment device. The above-mentioned boxes can be placed according to the space of the platform to form a split or integrated sewage treatment device.

The invention adopts the MBR process, and the membrane bioreactor (MBR) is a new high-efficiency sewage treatment process formed by combining biological treatment and membrane separation. Its working principle is to use the aerobic microorganisms in the reactor to degrade the organic pollutants in the sewage, and at the same time use the nitrifying bacteria in the reactor to convert the ammonia nitrogen in the sewage. The MBR process maintains a high biomass concentration through the interception of the membrane, and the amount of residual sludge is small, which increases the removal efficiency of ammonia nitrogen. The MBR membrane can not only intercept suspended solids, but also intercept bacteria, and can greatly remove bacteria and viruses. The effluent meets the national discharge standards and reclaimed water reuse indicators.

The whole process system of the present invention realizes PLC automatic control, and the operation and management are simple and convenient.

Description of drawings

Fig. 1 is the schematic diagram of the plane structure of the combined MBR sewage treatment and reuse device for the offshore platform of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of a combined MBR sewage treatment and reuse device for an offshore platform of the present invention.

In the figure, A-cabinet I, B-cabinet II, C-cabinet III, 1-grease trap, 2-kitchen water inlet pipe, 3-oil skimmer, 4-oil baffle, 5-separator Oil tank outlet pipe, 6-regulating tank, 7-coarse grille, 8-septic tank, 9-equipment room, 10-toilet discharge water inlet pipe, 11-septic tank partition, 12-septic tank outlet pipe , 13-overflow pipe, 14-trap with cleaning port, 15-wash water, bath water inlet pipe, 16-submersible sewage pump, 17-submersible sewage pump outlet pipe, 18-hydrolysis acidification tank, 19-MBR Pool, 20-fine grid, 21-outlet pipe of hydrolytic acidification tank, 22-overflow pipe of hydrolytic acidification tank, 23-MBR membrane module, 24-collection pipe, 25-membrane outlet pipe, 26-reclaimed water pump, 27-exposure Trachea, 28-air pipe pipeline, 29-blower, 30-automatic control system.

Detailed ways

In order to further understand the technical content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Refer to accompanying drawing 1 and Fig. 2.

Example 1

The combined MBR sewage treatment and reuse device for offshore platforms includes box Ⅰ, box Ⅱ and box Ⅲ. The cabinet Ⅰ is designed as a grease trap 1. The kitchen drain water enters the grease trap 1 through the kitchen water inlet pipe 2. An oil skimmer 3 and an oil retaining partition 4 are installed in the grease trap, and the grease trap is cleaned regularly through the oil skimmer 3. For the internal oil slick, the upper part of the grease trap is provided with a grease trap outlet pipe 5 that communicates with the adjustment tank 6 through the pipeline, and the outlet water enters the adjustment tank after passing through the coarse grille 7 of the adjustment tank. The box body Ⅰ is placed at the kitchen sewage discharge main pipe .

A septic tank 8, a regulating tank 6 and an equipment room 9 are arranged separately in the box body II, and the toilet discharge water enters the septic tank 8 through the toilet discharge water inlet pipe 10, and a septic tank partition 11 is arranged in the septic tank and a hole is opened for septic tank. The upper part of the septic tank 8 is provided with a septic tank outlet pipe 12 connected to the regulating tank 6, and the outlet water enters the regulating tank 6 after passing through the coarse grille 7 of the regulating tank, and the coarse grille 7 and the "horn" overflow pipe 13 are arranged in the regulating tank. The outlet nozzle of the overflow pipe is provided with a trap 14 with a cleaning port, and washing water, bath water, etc. enter the regulating pool through the coarse grille 7 of the regulating pool through the washing water, bathing water inlet pipe 15, and when the sewage in the regulating pool 6 passes through For a long time, it can be discharged from the overflow pipe 13, and the bottom of the adjustment tank is provided with a submersible sewage pump 16 and a submersible sewage pump outlet pipe 17 communicated with the submersible sewage pump.

A hydrolysis and acidification pool 18 and an MBR pool 19 are separately arranged in the box body III, and a fine grid 20 is arranged in the hydrolysis and acidification pool. The upper part of the pool is provided with a hydrolytic acidification pool outlet pipe 21 communicating with the MBR pool 19, and the upper part of the hydrolysis acidification pool is provided with a hydrolysis acidification pool overflow pipe 22 connected with the regulating pool 6. When the hydrolysis acidification pool 18 or MBR pool 19 sewage is too much, It can flow back from the overflow pipe 22 of the hydrolysis acidification tank to the regulating tank 6. A group of MBR membrane modules 23 are placed in the MBR tank 19. The water collection pipe 24 on the upper part of the membrane module communicates with the reclaimed water pump 26 through the membrane outlet pipe 25. The exposure at the bottom of the membrane module The air pipe 27 communicates with the air blower 29 through the air duct pipe 28 . The outlet water of the grease trap 1 of the tank I flows into the regulating tank 6 of the tank II by gravity through the connecting pipeline 5, and the regulating tank 6 of the tank II passes through the submersible sewage pump 16 and the outlet pipe 17 of the submersible sewage pump and the hydrolysis and acidification of the tank III The pool 18 is connected, and the box body II and the box body III are connected through a top plate connecting piece. The reclaimed water pump 26, blower 29, and automatic control system 30 are placed in the equipment room 9. Box Ⅰ, box Ⅱ and box Ⅲ are made of standard stamped steel plates, which are combined and assembled on site without hoisting equipment. The construction is convenient and fast, and the box is light and beautiful.

As a transformation of this embodiment, the box body I can be selected to be placed together with the box body II and the box body III according to the site space conditions of the platform, and connected by connectors to form an integrated combined sewage treatment and recycling device; according to the platform capacity And the platform has the largest number of personnel to increase the number of membrane modules.

The present invention is equipped with a clean water pool according to the site conditions of the platform, and domestic sewage enters the clean water pool after passing through the grease trap, septic tank, regulating tank, hydrolytic acidification pool, and MBR pool of the present invention; Disinfection device, if the running water in the clean water pool is kept, the disinfection device may not be provided. Each pool body effect of the present invention:

(a) Grease trap: separate oil from water to remove oil and some food and other residues;

(b) Septic tank: remove fecal residues, paper fibers and suspended solids with larger particle sizes;

(c) Regulating pool: adjust the water quality, water quantity and water temperature of sewage;

(d) Hydrolytic acidification pool: hydrolytic acidification reaction, precipitation;

(e) MBR pool: aerobic biodegradation reaction, nitrogen and phosphorus removal, removal of SS, turbidity, bacteria and viruses, etc.

The combined form of the MBR sewage treatment device and the manufacturing method of the box in this embodiment have breakthroughs in the following aspects in the sewage treatment technology of offshore platforms:

1. Combined MBR sewage treatment and reuse device, according to the characteristics of domestic sewage water quality and water volume, design toilet discharge water (black water) enters the septic tank, kitchen discharge water enters the grease trap, and the two are treated and then enter the regulating tank; other The discharge water goes directly into the regulating tank. Coarse grilles are set in the adjustment tank, and the incoming water passes through the grilles to remove paper fibers, hairs and larger particles of impurities, prevent pump blockage and damage, adjust water volume, and homogenize water quality to ensure long-term stable and continuous operation of the biochemical treatment system. Fast, stable and efficient processing effect. The fine grid of the hydrolytic acid pool intercepts hair and paper fibers again to prevent such impurities from clogging and damaging the membrane.

2. The high-strength stamped steel box structure, the evenly distributed tension bars in the box make the box bear even pressure, and the overall structure is unique and reasonable. The standard stamping plate can be combined and assembled at will, and assembled on site without hoisting equipment. The construction is convenient and fast, and the box is light and beautiful, which overcomes the limitation of the platform size on the sewage treatment device. Each box can be placed according to the platform space to form a split or integrated sewage treatment device.

3. At least 2 sets of membrane modules are installed in parallel in the MBR pool, and the number of operating membrane modules is selected according to the number of people on the platform, which increases the load resistance capacity of the MBR pool.

4. The upper part of the hydrolytic acidification tank is provided with an overflow pipe connected to the adjustment tank, and the inside of the adjustment tank is provided with a "horn" overflow port. When there is too much sewage in the hydrolysis acidification tank or the MBR tank, the sewage overflows into the adjustment tank. When the adjustment tank When there is too much sewage, the sewage overflows and is discharged outside. This overflow design reduces the probability of sewage overflowing and discharges, and the design is more reasonable.

5. Using the MBR process, the removal of organic matter by the membrane bioreactor (MBR) is the result of the joint action of the biochemical reaction of the activated sludge and the retention of the membrane module. MBR can maintain a high biomass concentration through the interception effect of the membrane, reduce the amount of residual sludge, and increase the removal efficiency of ammonia nitrogen. The removal of SS, turbidity and bacteria by MBR relies on the synergistic interception of the biofilm deposition layer formed by the membrane pores and the membrane surface, and the effluent can reach the standard of reclaimed water reuse.

Claims (7)

1. A combined MBR sewage treatment and reuse device for offshore platforms, characterized in that: the sewage treatment and reuse device includes three boxes, box I is a grease trap, and oil retaining baffles and oil skimming are arranged in the grease trap The upper part of the tank is equipped with a water outlet connected to the regulating tank; the tank II is divided into a septic tank and a regulating tank, and the septic tank is equipped with a partition and a hole, and the upper part of the septic tank is provided with an outlet pipe connected to the regulating tank. Coarse grids and overflow pipes are set in the regulating tank, and a submersible sewage pump and an outlet pipe connected to the submersible sewage pump are set at the bottom of the regulating tank; a hydrolytic acidification tank and an MBR tank are separately set in the tank III, and a fine grid is set in the hydrolytic acidification tank , the upper part of the hydrolytic acidification tank is provided with an outlet pipe connected to the MBR tank. The MBR membrane module is placed in the MBR tank. . 2. The combined MBR sewage treatment and reuse device for offshore platforms according to claim 1, characterized in that: a separate equipment room is arranged in the box body II, and a blower and a reclaimed water pump are installed in the equipment room. 3. According to claim 1 or 2, the combined MBR sewage treatment and reuse device for offshore platforms is characterized in that: the tank body I has pipelines connected with the tank body II, and the tank body II tank is connected through the submerged tank. The sewage pump and pipeline are connected with the hydrolytic acidification tank of the tank III. 4. The combined MBR sewage treatment and reuse device for offshore platforms according to claim 1 or 2, characterized in that: the overflow pipe in the adjustment pool is in the shape of a trumpet, and the outlet pipe of the overflow pipe is provided with a trap with a cleaning port . 5. The combined MBR sewage treatment and recycling device for offshore platforms according to claim 1 or 2, characterized in that: the box body II and the box body III are connected by connecting pieces. 6. The combined MBR sewage treatment and reuse device for offshore platforms according to claim 1 or 2, characterized in that: the upper part of the hydrolysis acidification tank is provided with an overflow pipe communicating with the adjustment tank. 7. The combined MBR sewage treatment and reuse device for offshore platforms according to claim 1 or 2, characterized in that: 1 to 4 sets of MBR membrane modules are placed in the MBR pool.

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