CN111170428A - High-turbidity wastewater purification method based on movable vehicle-mounted sewage treatment device - Google Patents
High-turbidity wastewater purification method based on movable vehicle-mounted sewage treatment device Download PDFInfo
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- CN111170428A CN111170428A CN201911202371.7A CN201911202371A CN111170428A CN 111170428 A CN111170428 A CN 111170428A CN 201911202371 A CN201911202371 A CN 201911202371A CN 111170428 A CN111170428 A CN 111170428A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/008—Mobile apparatus and plants, e.g. mounted on a vehicle
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Filtration Of Liquid (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a high-turbidity wastewater purification method based on a movable vehicle-mounted sewage treatment device, which adopts polypropylene plastic beads as filter materials to filter clarified water through the filter materials to obtain further purification.
Description
Technical Field
The invention relates to the technical field of high-turbidity wastewater purification methods based on a movable vehicle-mounted sewage treatment device, in particular to a high-turbidity wastewater purification method based on a movable vehicle-mounted sewage treatment device.
Background
Along with the development of decommissioning work of industrial system nuclear facilities in China and the wide application of high and new technologies, the development of a movable high-turbidity wastewater treatment device is particularly necessary and urgent, the movable high-turbidity wastewater treatment device can be used for treating high-turbidity wastewater, recovering and transforming polluted, aged and huge wastewater treatment facilities and wastewater pipe networks which are shut down for years, can solve the treatment problem of the high-turbidity wastewater generated in decommissioning of the wastewater treatment facilities, can also be used for purifying the high-turbidity wastewater generated in operation, scientific research, production development and production of the waste treatment facilities, can be used for industrial emergency treatment, can perform purification business of each waste liquid generation unit according to requirements, and can reduce the fixed investment of enterprises.
The movable vehicle-mounted high-turbidity wastewater purification treatment device can be used for treating byproducts of the industrialized society, such as industrial wastewater, resident sewer wastewater, slaughterhouse wastewater and the like, and has great harm to the environment after being discharged without treatment, and the purification method of the high-turbidity wastewater is a difficult problem which always troubles enterprises and governments and simultaneously hinders the development of the economic society. Along with the popularization of the movable vehicle-mounted high-turbidity wastewater purification treatment device, the government can provide higher purification standards for various kinds of high-turbidity wastewater.
At present, for high-turbidity wastewater with the suspended solid content of more than 500mg/L and even more than 5000mg/L, a few purification methods are adopted, and the cost is high. The prior art generally adopts a centrifugal treatment method, wherein one method is to adopt a centrifugal force and a series of blades to send fluid with certain kinetic energy into a rotating and purifying water purification system, but the system needs to have certain kinetic energy to keep the system rotating at high speed, the principle is complex and difficult to realize, foreign documents report a separator, which adopts the centrifugal acceleration to pass through a multi-layer filter to achieve solid-liquid separation, but the technology requires higher flow rate of wastewater, and suspended particles are easy to gather on the filter when the flow rate is lower to cause filter blockage, and in addition, some unique methods are also appeared in recent years to treat high-turbidity wastewater, such as: the use of live shrimps to swallow pollutants in a sludge pond, the use of a reverse osmosis membrane to filter high-flow-rate wastewater, and the like unfortunately, live shrimps die due to excessive pollution, and reverse osmosis membrane filters often suffer from the problem of filter membrane blockage, resulting in an increase in the cost of purifying wastewater. In view of the shortcomings of the prior art, it is urgent to find a high turbidity wastewater treatment system with low flow rate, low energy consumption, low clogging resistance, good purification effect and low cost, and therefore, an improved technique for solving the problems in the prior art is needed.
Disclosure of Invention
The invention aims to provide a high-turbidity wastewater purification method based on a movable vehicle-mounted sewage treatment device, the system has perfect automatic detection and self-protection functions, the running state or fault of equipment can be visually displayed on a large screen, and the operation and maintenance are convenient; the system is high in water quality and stable in water quality, the movable vehicle-mounted high-turbidity wastewater purification treatment device is close to and exceeds the level of similar products in foreign countries, and meanwhile compared with similar products used in foreign markets, the research product of the project has very obvious advantages and very strong competitiveness in the foreign countries and the foreign countries.
In order to achieve the purpose, the invention provides the following technical scheme: a movable vehicle-mounted high-turbidity wastewater purification treatment device comprises the following steps:
the method comprises the following steps: installing a sludge pump, a reaction tank and a main cylinder body in a carriage;
step two: before sewage enters the reaction tank from the sewage inlet, the sewage and a coagulant are uniformly mixed at the highest speed, and the medicine adding port is arranged at the sewage pump suction port for sucking the sewage;
step three: the sewage firstly enters a reaction tank to perform contact reaction with a ceramic ball layer in a reaction area, and then tangentially enters an inner cylinder body through a water bending pipe;
step four: entering a suspension zone to form alum floc, and gradually slowing down the stirring speed through a funnel partition plate;
step five: entering a clarification zone where alum floc settles;
step six: the water enters a filtering area, and the clarified water is filtered by a filtering material by using polypropylene plastic beads as the filtering material to obtain further purification;
step seven: the water which continuously rises flows through the filter head plate and enters the water collecting area, and then clear water is directly sent into a water tower or supplied to users through a water outlet pipe;
step eight: the settled sludge after condensation is concentrated towards the center of the main cylinder body, passes through a sludge barrel and enters a sludge concentration chamber through a radiant tube for settlement;
step nine: the pressure difference formed by the pressure difference forms bypass flow in the main cylinder body, namely alum blossom continuously enters the sludge concentration chamber, clear water at the upper part of the sludge concentration chamber is automatically pressed into the return pipe, enters the filtering area, is filtered by the upper half filtering area to become clear water and enters the water collecting area;
step ten: the settled sludge is concentrated in the sludge concentration chamber, and after a certain sludge concentration and working period are reached, the sludge discharge port is opened to discharge the sludge.
Preferably, the reaction tank in the second step is of a cuboid sealed container structure and is vertically installed.
Preferably, in the second step, the main cylinder is vertically installed.
Preferably, polypropylene plastic beads are adopted as filter materials in the filtering area in the sixth step.
Preferably, a funnel partition plate is arranged at the upper end of the inner cylinder in the third step, and the funnel partition plate at the upper end of the inner cylinder separates a suspension zone and a sludge concentration chamber in the main cylinder.
Preferably, in the eighth step, the upper end of the mud bucket is an opening and is set to be a cone larger than the bucket opening of the mud bucket, and the mud bucket is connected with the funnel partition plate at the upper end of the inner cylinder body through a plurality of radiation pipes and is communicated with the sludge concentration chamber through the radiation pipes.
Preferably, in the ninth step, two ends of the bottom of the return pipe are respectively connected with two sides of the main cylinder and communicated with the sludge concentration chamber, and the upper end of the return pipe is arranged in the filtering area of the main cylinder and is provided with a plurality of holes.
Compared with the prior art, the invention has the beneficial effects that:
(1) and the polypropylene plastic beads are used as a filter material, so that the clarified water is further purified by filtering through the filter material.
(2) The process adopts a movable vehicle-mounted sewage treatment device to integrate mixing, reaction, suspension clarification, sedimentation, filtration, clear water collection and sludge concentration into a whole, and is a high-efficiency movable vehicle-mounted high-turbidity sewage purifier;
(3) the device is designed as a movable vehicle-mounted high-turbidity wastewater treatment device, and has the advantages of small floor area, short delivery period and convenient transportation and installation;
(4) the vehicle-mounted mobile type has strong maneuverability, can realize continuous treatment of a plurality of areas and emergency guarantee of water source pollution accidents, and can be started and stopped along with the water treatment system, thereby greatly reducing the use cost.
(5) The water treatment technology, the automatic control technology and the computer technology are organically combined to treat the high-turbidity wastewater, so that the personnel organization and labor intensity are reduced, the automation level of an enterprise is improved, and the daily maintenance is simple and convenient.
Drawings
FIG. 1 is a schematic view of the sewage treatment process of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
In the figure: the device comprises a sewage inlet 1, a reaction tank 2, a ceramic ball layer 3, a water folding pipe 4, an inner cylinder 5, a suspension area 6, a clarification area 7, a filtration area 8, a water collection area 9, a mud bucket 10, a sludge concentration chamber 11, a mud discharge port 12, a backflow pipe 13, a main cylinder 14, a sewage pump 15 and a dosing port 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a high-turbidity wastewater purification method based on a movable vehicle-mounted sewage treatment device comprises the following steps:
the method comprises the following steps: installing a sludge pump, a reaction tank and a main cylinder body in a carriage;
step two: before sewage enters the reaction tank from the sewage inlet, the sewage and a coagulant are uniformly mixed at the highest speed, and the medicine adding port is arranged at the sewage pump suction port for sucking the sewage;
step three: the sewage firstly enters a reaction tank to perform contact reaction with a ceramic ball layer in a reaction area, and then tangentially enters an inner cylinder body through a water bending pipe;
step four: entering a suspension zone to form alum floc, and gradually slowing down the stirring speed through a funnel partition plate;
step five: entering a clarification zone where alum floc settles;
step six: the water enters a filtering area, and the clarified water is filtered by a filtering material by using polypropylene plastic beads as the filtering material to obtain further purification;
step seven: the water which continuously rises flows through the filter head plate and enters the water collecting area, and then clear water is directly sent into a water tower or supplied to users through a water outlet pipe;
step eight: the settled sludge after condensation is concentrated towards the center of the main cylinder body, passes through a sludge barrel and enters a sludge concentration chamber through a radiant tube for settlement;
step nine: the pressure difference formed by the pressure difference forms bypass flow in the main cylinder body, namely alum blossom continuously enters the sludge concentration chamber, clear water at the upper part of the sludge concentration chamber is automatically pressed into the return pipe, enters the filtering area, is filtered by the upper half filtering area to become clear water and enters the water collecting area;
step ten: the settled sludge is concentrated in the sludge concentration chamber, and after a certain sludge concentration and working period are reached, the sludge discharge port is opened to discharge the sludge.
As shown in fig. 2, the structure of the movable vehicle-mounted sewage treatment device and the connection relationship among the structures are as follows: the sewage inlet 1 is connected with one side of the bottom end of the reaction tank 2 through a sewage pump 15, a chemical adding port 16 is arranged at the position of the sewage inlet 1, which is positioned at a water suction port of the sewage pump 15, a ceramic ball layer 3 is arranged inside the reaction tank 2, the other side of the reaction tank 2 is connected with one end of a water folding pipe 4, the other end of the water folding pipe 4 is connected with the bottom of an inner cylinder 5, the inner cylinder 5 is arranged inside the bottom end of a main cylinder 14, the upper end of the inner cylinder 5 is positioned inside the main cylinder 14 and is provided with a suspension area 6, the upper end of the suspension area 6 is provided with a clarification area 7, the upper end of the clarification area 7 is provided with a filtration area 8, the upper end of the filtration area 8 is provided with a water collection area 9, the upper end of the inner cylinder 5 is provided with a mud barrel 10, a sludge concentration chamber 11 is arranged between the outer wall of the inner cylinder 5 and the inner wall of the bottom end of an outer cylinder, the mud barrel 10 is, the upper end of the return pipe 13 is arranged in the filtering area 8 of the main cylinder 14.
Wherein, retort 2 is cuboid sealed container structure and adopts vertical installation, and retort 2's container material is the carbon steel material, and the main barrel 14 adopts vertical installation.
Wherein, the filtering area 8 adopts polypropylene plastic beads as filtering materials.
Wherein, the upper end of the inner cylinder 5 is provided with a funnel baffle plate, and the funnel baffle plate at the upper end of the inner cylinder 5 separates the suspension zone 6 in the main cylinder 14 from the sludge concentration chamber 11.
Wherein, the upper end of the mud bucket 10 is an opening and is arranged as a cone body which is larger than the opening of the mud bucket 10, the mud bucket 10 is connected with the funnel baffle plate at the upper end of the inner cylinder 5 through a plurality of radiant tubes and is communicated with the sludge concentration chamber 11 through the radiant tubes.
Wherein, the upper end of the return pipe 13 is provided with a plurality of holes at the inner part of the main cylinder 14.
The use principle is as follows: in the first stage, before sewage enters the reaction tank 2 from the sewage inlet 1, the sewage and a coagulant are uniformly mixed at the highest speed, the dosing port 16 is arranged at the suction port of the sewage pump 15 for sucking the sewage, and a water pump impeller rotating at a high speed can play a good role in stirring. The sewage firstly enters the reaction tank 2 to perform contact reaction with the ceramic ball layer 3 in the reaction zone, then enters the inner cylinder body 5 through the water folding pipe 4 in a tangential direction, and the sewage in a turbulent flow state starts to rotate and plays a role in stirring. Then entering the suspension zone 6 is an area where the alum blossom forms and grows gradually, the structure of the area is designed to be a conical structure (a funnel partition plate) with gradually reduced flow speed, and the stirring speed is required to be gradually reduced so as to avoid breaking the large alum blossom. Then enters a clarification zone 7, wherein the sectional area of the tank body is the largest, so that the upward flow velocity is the slowest, and the settlement of alum floc is facilitated. Then the water enters a filtering area 8, and the clarified water is filtered by a filter material by using polypropylene plastic beads as the filter material to obtain further purification. In order to increase the relative flow speed of the filter layer, the pressure difference for forming the bypass return flow is increased, and simultaneously, the separation capacity of the sludge entering the sludge concentration chamber 11 is improved, so that the effect of large purified water amount and high speed is achieved. The water which continuously rises flows through the filter head plate and enters the water collecting area 9, and then the clear water is directly sent into a water tower or a user by the water outlet pipe. The device is also provided with a sludge concentration chamber 11 and a return pipe 13, so that the settled sludge after condensation is concentrated towards the center of the main cylinder 14 and enters the sludge concentration chamber 11 through the radiation pipe for settlement after passing through the sludge barrel 10. In order to improve the amount and speed of sludge entering the mud bucket 10, the upper part of the mud bucket 10 is arranged to be a mud discharge bucket cone which is larger than the bucket opening, so that the area of the upper opening of the mud discharge bucket is enlarged, and the speed of sludge rising in the suspension area 6 is slowed down. The pressure difference formed by the pressure difference forms bypass flow in the main cylinder 14, namely alum blossom continuously enters the sludge concentration chamber 11, and clear water at the upper part of the sludge concentration chamber 11 is automatically pressed into the return pipe 13, enters the filtering area 8, is filtered by the upper half filtering area 8 and becomes clear water to enter the water collecting area 9. The settled sludge is concentrated in the sludge concentration chamber 11, so that the sludge discharge period is prolonged, the water content of the sludge is reduced, and the total water yield is relatively increased. When the sludge concentration and the working period reach a certain value, the sludge discharge port 12 is opened to discharge the sludge.
According to the mechanics principle of filtering water, the filtering area adopts the filter bed formed by polypropylene foam plastic beads and the flow velocity of water, under the state of the flow velocity, the theoretical calculated value of the head loss of the filter material is more than 6.6 meters of water column, and the theoretical calculated value of the resistance loss in the forced water outlet backflow pipe is only 0.5 meters of water column, and by the pressure difference formed by the pressure difference of the two, the bypass flow in the tank body is formed, namely alum blossom continuously enters the sludge concentration chamber, cleaner water at the upper part of the concentration chamber is automatically pressed into the forced water outlet backflow pipe, enters the filtering area, and is filtered by the upper half filtering area to become clean water which enters the water collecting area.
The design is based on chemical coagulation, pressure filtration and hydraulics principle. The device consists of a reaction tank, a main cylinder body, a mud bucket, a pipe and the like. According to the characteristics of the coagulation process, the sewage and the coagulant are required to be uniformly mixed at the highest speed, the dosing port is arranged at the sewage pumping port for sucking the sewage, and a water pump impeller rotating at high speed can play a good role in stirring. The sewage firstly enters the reaction tank to perform contact reaction with the ceramic ball layer in the reaction zone, then tangentially enters the inner cylinder body through the water bending pipe, and the sewage in a turbulent flow state starts to rotate and plays a role in stirring.
The clarified water is further purified by filtering with filter material of polypropylene-ethylene plastic beads. In order to increase the relative flow speed of the filter layer, increase the pressure difference for forming bypass return, and improve the separation capacity of sludge entering the sludge concentration chamber, the upper filtering area of the main cylinder is arranged as a cylinder, so as to achieve the effect of large purified water amount and high speed. The rising water flows through the filter head plate into the water collection area.
The whole device is designed into a movable vehicle-mounted high-turbidity wastewater treatment device, so that the occupied area is reduced, the delivery period is shortened, and the transportation and installation are convenient.
A sewage purifier integrates mixing, reaction, suspension clarification, precipitation, filtration, clear water collection and sludge concentration and can treat high turbidity. Has the ideal effects of high purification efficiency and short process flow.
An integrated dosing device is reserved in the device system, and can be adjusted in time according to the water quality of inlet and outlet water.
The water treatment technology, the automatic control technology and the computer technology are organically integrated to treat the culture tail water, so that the personnel establishment and labor intensity are reduced, the automation level of an enterprise is improved, and the daily maintenance is simple and convenient.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A high-turbidity wastewater purification method based on a movable vehicle-mounted sewage treatment device is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: installing a sludge pump, a reaction tank and a main cylinder body in a carriage;
step two: before sewage enters the reaction tank from the sewage inlet, the sewage and a coagulant are uniformly mixed at the highest speed, and the medicine adding port is arranged at the sewage pump suction port for sucking the sewage;
step three: the sewage firstly enters a reaction tank to perform contact reaction with a ceramic ball layer in a reaction area, and then tangentially enters an inner cylinder body through a water bending pipe;
step four: entering a suspension zone to form alum floc, and gradually slowing down the stirring speed through a funnel partition plate;
step five: entering a clarification zone where alum floc settles;
step six: the water enters a filtering area, and the clarified water is filtered by a filtering material by using polypropylene plastic beads as the filtering material to obtain further purification;
step seven: the water which continuously rises flows through the filter head plate and enters the water collecting area, and then clear water is directly sent into a water tower or supplied to users through a water outlet pipe;
step eight: the settled sludge after condensation is concentrated towards the center of the main cylinder body, passes through a sludge barrel and enters a sludge concentration chamber through a radiant tube for settlement;
step nine: the pressure difference formed by the pressure difference forms bypass flow in the main cylinder body, namely alum blossom continuously enters the sludge concentration chamber, clear water at the upper part of the sludge concentration chamber is automatically pressed into the return pipe, enters the filtering area, is filtered by the upper half filtering area to become clear water and enters the water collecting area;
step ten: the settled sludge is concentrated in the sludge concentration chamber, and after a certain sludge concentration and working period are reached, the sludge discharge port is opened to discharge the sludge.
2. The method for purifying high-turbidity wastewater based on the movable vehicle-mounted sewage treatment device according to claim 1, characterized in that: and in the second step, the reaction tank is of a cuboid sealed container structure and is vertically installed.
3. The method for purifying high-turbidity wastewater based on the movable vehicle-mounted sewage treatment device according to claim 1, characterized in that: and in the second step, the main cylinder body is vertically installed.
4. The method for purifying high-turbidity wastewater based on the movable vehicle-mounted sewage treatment device according to claim 1, characterized in that: and in the sixth step, polypropylene plastic beads are adopted as filter materials in the filtering area.
5. The method for purifying high-turbidity wastewater based on the movable vehicle-mounted sewage treatment device according to claim 1, characterized in that: and in the third step, the upper end of the inner cylinder is provided with a funnel partition plate, and the funnel partition plate at the upper end of the inner cylinder separates a suspension area in the main cylinder from the sludge concentration chamber.
6. The method for purifying high-turbidity wastewater based on the movable vehicle-mounted sewage treatment device according to claim 1, characterized in that: and in the step eight, the upper end of the mud bucket is provided with an opening and is arranged to be a cone body larger than the bucket opening of the mud bucket, and the mud bucket is connected with the funnel partition plate at the upper end of the inner cylinder body through a plurality of radiation pipes and is communicated with the sludge concentration chamber through the radiation pipes.
7. The method for purifying high-turbidity wastewater based on the movable vehicle-mounted sewage treatment device according to claim 1, characterized in that: in the ninth step, two ends of the bottom of the return pipe are respectively connected with two sides of the main cylinder body and communicated with the sludge concentration chamber, and the upper end of the return pipe is arranged in the filtering area of the main cylinder body and is provided with a plurality of holes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911202371.7A CN111170428A (en) | 2019-11-29 | 2019-11-29 | High-turbidity wastewater purification method based on movable vehicle-mounted sewage treatment device |
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| CN201911202371.7A CN111170428A (en) | 2019-11-29 | 2019-11-29 | High-turbidity wastewater purification method based on movable vehicle-mounted sewage treatment device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2217013Y (en) * | 1995-04-10 | 1996-01-10 | 杨昌力 | High efficiency apparatus for treating high turbidity waste water |
| CN1821123A (en) * | 2006-03-12 | 2006-08-23 | 胡旭清 | Device and method for anaerobic treating waste water and method of propagating active granular bacteria strain at normal termperature |
-
2019
- 2019-11-29 CN CN201911202371.7A patent/CN111170428A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2217013Y (en) * | 1995-04-10 | 1996-01-10 | 杨昌力 | High efficiency apparatus for treating high turbidity waste water |
| CN1821123A (en) * | 2006-03-12 | 2006-08-23 | 胡旭清 | Device and method for anaerobic treating waste water and method of propagating active granular bacteria strain at normal termperature |
Non-Patent Citations (1)
| Title |
|---|
| 中国环境保护产业协会: "《突发水污染事件应急处置技术与装置》", 30 November 2013, 北京：中国环境出版社 * |
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Application publication date: 20200519 |