CN210620508U

CN210620508U - A zero-discharge system for comprehensive treatment of oily sewage in subway depots

Info

Publication number: CN210620508U
Application number: CN201920870818.7U
Authority: CN
Inventors: 唐芬; 熊园林; 吴锐
Original assignee: Wuhan Xinda Innovation Water Treatment Technology Co ltd
Current assignee: Wuhan Xinda Innovation Water Treatment Technology Co ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-05-26
Anticipated expiration: 2029-06-11

Abstract

The utility model discloses a zero-discharge system for comprehensive treatment of oily sewage in subway depots, comprising a first waste water conditioning tank, oil separation and sedimentation equipment, air flotation equipment, a quartz sand filter and an activated carbon filter; There is an oil absorption device, and the suction port of the oil absorption device moves up and down with the liquid level; the effluent of the activated carbon filter and the domestic sewage enter the second waste water conditioning tank, and the effluent of the second waste water conditioning tank enters the integrated membrane system equipment, The effluent from the clean water pool of the integrated membrane system equipment enters the clean water recycling pool. The oil absorption equipment can increase the removal rate of heavy oil in the car washing wastewater of the depot; at the same time, the production wastewater and the domestic sewage are separated by quality, and finally meet the standard in "Urban Miscellaneous Water Quality" GBT_18920‑2002 and reused for car washing and greening in the car wash workshop.

Description

Railcar section oily sewage comprehensive treatment zero discharge system

Technical Field

The utility model relates to a railcar section oily waste water of production and domestic sewage integrated treatment zero discharge system.

Background

The subway vehicle section is a comprehensive maintenance base for parking, overhauling and maintaining vehicles. The maintenance, detection and management work of each process equipment is carried out. The system mainly comprises a comprehensive office building, an application warehouse, an overhaul warehouse, a material main warehouse, a traction voltage-reduction substation and other auxiliary rooms, and covers more than twenty major fields such as buildings, rails, power supply, communication, signals, low voltage, water supply and drainage, ventilation and air conditioning, gas fire extinguishing, fire alarm, environment and equipment monitoring and the like.

The daily sewage generated by the subway vehicle section is mainly divided into the following types according to components and sources:

(1) production wastewater: mainly comes from cleaning parts such as steering frames, wheel sets and the like in a production workshop and a small amount of alkaline wastewater generated between storage batteries. Mainly contains oil stain, metal detergent, suspended matters and the like.

(2) Domestic sewage: the sewage is mainly from flushing sewage generated in toilets in daily life and office processes, canteen oily wastewater, and mainly carbon-containing organic matters, suspended matters, vegetable oil and the like.

According to the relevant national laws and regulations. The sewage of the subway vehicle section must be treated before being discharged to a nearby municipal sewage pipe network or river.

The waste water of the vehicle section enters a regulating tank through a pipe network or a water channel, and is lifted by a pump to enter an oil separation sedimentation tank to remove larger suspended matters and silt. Adding the discharged water into the chemicals, coagulating, and making the mixture enter an air flotation tank, wherein the air flotation adopts a pressurized air dissolving method. A large amount of micro-bubbles released by suddenly decompressing the pressurized gas dissolving water are adhered with alum floc formed by coagulation to form a carrier with air bubbles, the density of the carrier is less than that of water, and the carrier floats to the water surface to form scum, thereby achieving the purpose of removing oil and purifying water quality. The car washing wastewater is treated by a sedimentation tank to remove a large amount of silt, is treated by an air flotation tank to remove oil stain, micro particles and colloid, is treated by coagulation, air flotation and sedimentation in a double-air-flotation comprehensive water purifier, is filtered in a filter tank, is further filtered by quartz sand and an active carbon filter to remove impurities, and is treated by adding sodium hypochlorite to disinfect before a water storage tank, wherein the turbidity, BOD5, COD and the like of the water reach the standard of recycled water.

The process usually adopts an integrated equipment structure to realize the standard-reaching treatment and discharge of the waste water of the vehicle section. Because of the water quality characteristics of the subway sewage and no system for comprehensive treatment, the subway sewage treatment work often cannot achieve the expected effect, and further causes the problems of environmental pollution, environmental protection, investment waste and the like.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is overcome among the prior art subway vehicle section sewage treatment's the poor defect of deoiling effect, the utility model provides a sewage treatment system of new branch matter reposition of redundant personnel to improve subway vehicle section sewage treatment effect.

In order to solve the technical problem, the utility model provides a following technical scheme:

a subway vehicle section oily sewage comprehensive treatment zero-emission system comprises a first wastewater adjusting tank, an oil separation and precipitation device, an air floatation device, a quartz sand filter and an activated carbon filter; the production wastewater of the first wastewater adjusting tank enters oil removal and precipitation equipment, and the oil removal and precipitation equipment is connected with air floatation equipment; supernatant effluent of the air floatation device enters a quartz sand filter, effluent of the quartz sand filter enters an activated carbon filter for filtration, the first wastewater adjusting tank is provided with an oil absorption device, and a suction inlet of the oil absorption device moves up and down along with the liquid level; and the effluent of the activated carbon filter and the domestic sewage enter a second wastewater regulating tank, the effluent of the second wastewater regulating tank enters the integrated membrane system equipment, and the effluent in a clean water tank of the integrated membrane system equipment enters a clean water reuse tank.

The oil suction equipment utilizes the buoyancy difference between the inner liquid surface and the outer liquid surface, and the suction inlet always fluctuates up and down along with the change of the liquid surface to effectively absorb the surface layer floating oil.

Further, the oil separation tank of the oil separation settling equipment is an inclined tube type oil separation tank. The production wastewater is lifted into a first wastewater adjusting tank for homogenization before treatment, enters an oil separation and sedimentation device, enters a working area after being distributed with water and homogenized by a perforated wall in a water inlet area, flows at a uniform speed on the cross section of the tank, and floats naturally by the difference of the density of the floatable oil in the wastewater and the density of the water in the flowing process. When the floating oil reaches a certain thickness, the oil scraping mud scraper and the oil collecting pipe are operated to collect the dirty oil, so as to achieve the purpose of oil-water separation. Meanwhile, mechanical impurities with density larger than that of water, such as sand grains and the like, are removed and sink to the bottom of the tank to achieve the effect of separating water.

The air floatation device mainly plays a role in solid-liquid separation (can reduce COD, BOD, chroma and the like at the same time). Micro bubbles in the dissolved air water generated by the dissolved air system are bonded with suspended matter flocs in the water, so that the suspended matter rises to the water surface along with the micro bubbles to form scum, and the suspended flocs in the water are removed. The clear water passes through the jet flow suction device, under the condition of certain working pressure, the air is dissolved into the water to the maximum extent, and small bubbles with the diameter of about 30-50 um are formed through rapid decompression and release.

Adding flocculant PAC or PAM into raw water, and carrying out effective flocculation reaction for 5-20 min. The time, dosage and flocculation effect of the method are determined by experiments, and raw water enters a contact area through flocculation reaction. In the contact area, the micro bubbles and flocs in raw water are adhered to each other and enter the separation area, and the flocs and bubbles rise to the liquid level together under the action of bubble buoyancy to form scum. The scum is scraped to a sludge area by a foam scraper.

The supernatant effluent of the air floatation tank enters a quartz sand filter, and the equipment is widely used for mainly removing mechanical impurities, colloids, microorganisms, organic matters, active chlorine and the like in the water treatment process. Meanwhile, the method is used for the pre-stage pretreatment of a feed water treatment turbidity removal, reverse osmosis and ion exchange softening desalination system, and can also be used for removing silt from surface water and underground water. The equipment has simple structure, easy operation and high safety performance; the operation is stable; easy maintenance.

And the effluent of the quartz sand filter passes through an activated carbon filter, mechanical impurities, colloid, microorganisms, organic matters, active chlorine and the like are removed, the effluent enters a second wastewater regulating tank, and meanwhile, domestic sewage also enters the second wastewater regulating tank together. Furthermore, a stirrer and a liquid level meter are arranged on the second wastewater adjusting tank. The liquid level meter is used for regulating the amount of water entering the integrated membrane system equipment.

The integrated membrane system device is a novel water treatment technology organically combining anaerobic and membrane separation technologies with biotechnology, active sludge and macromolecular organic matters in a biochemical reaction tank are retained by utilizing the membrane separation equipment, and a secondary sedimentation tank is omitted. The integrated membrane system equipment process greatly strengthens the function of the bioreactor through the separation technology of the membrane, greatly improves the concentration of the activated sludge, and can respectively control the Hydraulic Retention Time (HRT) and the Sludge Retention Time (SRT) for further removing COD in the wastewater; and the outlet water in the clean water tank of the integrated membrane system equipment enters a reuse water tank.

Furthermore, the effluent of the clean water reuse tank is reused for overhauling a car washing workshop and greening irrigation through a variable-frequency water supply pump.

The utility model discloses the beneficial effect who reaches is: the utility model adds an oil absorption device in the first wastewater adjusting tank, increases the removal rate of heavy oil in the vehicle section car washing wastewater, reduces the burden of removing the oil for the oil separation sedimentation tank and the air floatation device which remove the oil at the back, and simultaneously achieves the removal effect of the heavy oil and the emulsified oil; meanwhile, the production wastewater and the domestic sewage are divided according to the quality, the production wastewater and the domestic sewage are treated firstly and then enter a biochemical system together, the non-biochemical property of the production wastewater is avoided, and the domestic sewage enters a later-stage integrated membrane treatment device for further degrading COD (chemical oxygen demand) and nitrogen and phosphorus, so that the standard of 'urban miscellaneous water quality' GBT _18920 plus 2002 is reached and the production wastewater and the domestic sewage are recycled to a car washing workshop for car washing and greening irrigation.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

In the drawings:

FIG. 1 is a block diagram of a prior art wastewater treatment system;

fig. 2 is a system block diagram of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Example 1

As shown in fig. 1, a system for comprehensive treatment and zero discharge of oily sewage at a metro vehicle section comprises a first wastewater adjusting tank 1, an oil removal and precipitation device 2, an air flotation device 3, a quartz sand filter 4 and an activated carbon filter 6; the production wastewater enters a first wastewater adjusting tank 1 for adjusting and then enters an oil separation precipitation device 2, and the oil separation precipitation device 2 is connected with an air flotation device 3; supernatant effluent of the air floatation device 3 enters a quartz sand filter 4, effluent of the quartz sand filter 4 enters an activated carbon filter 6 for filtering, an oil absorption device 3 is arranged in the first wastewater adjusting tank, and a suction inlet of the oil absorption device 3 moves up and down along with the liquid level; the effluent of the activated carbon filter 6 and domestic sewage enter a second wastewater regulating tank 7 together, the effluent of the second wastewater regulating tank 7 enters an integrated membrane system device 8, and the effluent in a clean water tank of the integrated membrane system device 8 enters a clean water reuse tank.

The treated water of the system reaches the standard in 'urban general service water quality' GBT _18920-2002 and is reused for car washing and greening irrigation in a car washing workshop.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A subway vehicle section oily sewage comprehensive treatment zero-emission system comprises a first wastewater adjusting tank, an oil separation and precipitation device, an air floatation device, a quartz sand filter and an activated carbon filter; the production wastewater of the first wastewater adjusting tank enters oil removal and precipitation equipment, and the oil removal and precipitation equipment is connected with air floatation equipment; supernatant effluent of the air floatation equipment enters a quartz sand filter, and effluent of the quartz sand filter enters an activated carbon filter for filtration, and the device is characterized in that the first wastewater adjusting tank is provided with an oil absorption device, and a suction inlet of the oil absorption device moves up and down along with the liquid level; and the effluent of the activated carbon filter and the domestic sewage enter a second wastewater regulating tank, the effluent of the second wastewater regulating tank enters the integrated membrane system equipment, and the effluent in a clean water tank of the integrated membrane system equipment enters a clean water reuse tank.

2. The system for the comprehensive treatment and zero discharge of oily sewage of the metro vehicle section according to claim 1, wherein a stirrer and a liquid level meter are arranged on the second wastewater adjusting tank.

3. The system for comprehensively treating oily sewage and zero discharge in the metro vehicle section according to claim 1, wherein the effluent of the clean water reuse tank is reused by a variable frequency water supply pump.

4. The system for the comprehensive treatment and zero discharge of oily sewage of the metro vehicle section according to claim 1, wherein the oil separation tank of the oil separation and precipitation equipment is an inclined tube type oil separation tank.