CN210894247U - VOCS on-line monitoring system - Google Patents
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Abstract
The utility model discloses a VOCS on-line monitoring system, include: the system comprises an explosion-proof grid VOCS automatic monitoring device, a VOCS early warning laser radar, a VOCS boundary monitoring station, a fixed pollution source VOCS automatic monitoring device, an online comparison monitoring device and a VOCS online control and early warning platform; the online contrast monitoring device receives monitoring data sent by the explosion-proof grid VOCS automatic monitoring device, the VOCS early warning laser radar, the VOCS boundary monitoring station and the fixed pollution source VOCS automatic monitoring device, processes and stores the data, and sends a processing result to a VOCS prior management and control and early warning platform. The utility model discloses a VOCS on-line monitoring system can directly gather the conveying by the terminal and type into emission data and pollutant data, realizes that the automation sum of data reports on the management aspect, and multiple data assembles the transmission, directly transmits the supervision platform, the comprehensive information evaluation service with data unification.
Description
Technical Field
The utility model relates to an environmental monitoring technical field, in particular to VOCS on-line monitoring system.
Background
In China, VOCs (volatile organic compounds) generally refer to organic compounds with saturated vapor pressure of more than 133.32Pa at normal temperature and boiling point of 50-260 ℃ below at normal pressure, or any organic solid or liquid capable of volatilizing at normal temperature and normal pressure.
When the concentration of Volatile Organic Compounds (VOCs) in indoor air is too high, acute poisoning is easily caused, and a light person can have headache, dizziness, cough, nausea, vomiting or a drunk shape; serious patients can have hepatotoxicity and even coma, and some of them can be life-threatening. Foreign medical research proves that the probability of fetal deformity of pregnant women living in the environment polluted by VOCs is far higher than that of ordinary people, and the influence on the future intelligence development of children is possibly caused. Meanwhile, VOCs in indoor air are important reasons for diseases of nervous system, blood system and acquired diseases of children. Therefore, it is very important to monitor the VOCs in the environment from time to time.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of the prior art, the embodiment of the utility model provides a VOCS on-line monitoring system. The technical scheme is as follows:
in one aspect, a VOCS online monitoring system includes: the system comprises an explosion-proof grid VOCS automatic monitoring device, a VOCS early warning laser radar, a VOCS boundary monitoring station, a fixed pollution source VOCS automatic monitoring device, an online comparison monitoring device and a VOCS online control and early warning platform;
the explosion-proof grid VOCS automatic monitoring device, the VOCS early warning laser radar, the VOCS boundary monitoring station and the fixed pollution source VOCS automatic monitoring device are respectively connected with the online contrast monitoring device through a wireless network, and the online contrast monitoring device is connected with the VOCS online control and early warning platform through a wireless or wired network;
and the online contrast monitoring device receives monitoring data sent by the explosion-proof grid VOCS automatic monitoring device, the VOCS early warning laser radar, the VOCS boundary monitoring station and the fixed pollution source VOCS automatic monitoring device, processes and stores the data, and sends a processing result to the VOCS prior control and early warning platform.
Further, a PID detector is arranged in the explosion-proof grid VOCS automatic monitoring device and is used for detecting the total VOCS amount and non-methane total hydrocarbons in the air; and the explosion-proof grid VOCS automatic monitoring device transmits the monitoring result to the online comparison monitoring device through a wireless network.
Further, the VOCS boundary monitoring station is used for monitoring conventional pollutants, characteristic pollutants VOCS, malodorous sulfides and meteorological parameters; the VOCS boundary monitoring station transmits a monitoring result to an online comparison monitoring device through a wireless network;
the common contaminants include: PM (particulate matter)10、PM2.5、SO2(H2S)、NOX(NH3) CO and O3(ii) a The characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons, benzene series, low volatility organics (C2-C6) and high volatility organics (C6-C12); the malodorous sulphide comprises: carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan, and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
Further, the system also comprises an environment sensitive point VOCS stink monitoring station; the environment sensitive point VOCS stink monitoring station is used for monitoring characteristic pollutants VOCS, stink sulfides and meteorological parameters; the environment sensitive point VOCS stink monitoring station transmits a monitoring result to an online comparison monitoring device through a wireless network;
the characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons and benzene series; the malodorous sulphide comprises: carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan, and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
Further, the system also comprises a mobile VOCS monitoring vehicle; the mobile VOCS monitoring vehicle is used for monitoring characteristic pollutants VOCS, malodorous sulfides and meteorological parameters; the mobile VOCS monitoring vehicle transmits a monitoring result to an online comparison monitoring device through a wireless network;
the characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons, benzene series, low volatility organics (C2-C6) and high volatility organics (C6-C12); the malodorous sulphide comprises: carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan, and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
Further, the VOCS early warning laser radar monitors VOCS and particulate matter concentration through laser scanning, including vertical scanning, horizontal scanning and section scanning; and the VOCS early warning laser radar transmits the monitoring result to an online comparison monitoring device through a wireless network.
Further, the VOCS early warning laser radar further comprises photographing and camera shooting functions.
Further, the system also comprises a soil underground VOCS detection device; the soil underground VOCS detection device is used for monitoring non-methane total hydrocarbons, methane, petroleum hydrocarbons, carbon dioxide, oxygen, hydrogen sulfide, nitrous oxide, pressure, humidity and temperature at different depths of underground soil; the soil underground VOCS detection device transmits a monitoring result to an online comparison monitoring device through a wireless network; the underground soil VOCS detection device also has a soil sampling function.
Further, the system also comprises a natural gas wellhead VOCS monitoring device; the natural gas wellhead VOCS monitoring device is internally provided with a gas chromatograph, and the sulfur content, the content of malodorous gas and the components and heat value response of C1-C6 natural gas in the natural gas are monitored through the gas chromatograph; and the natural gas wellhead VOCS monitoring device transmits the monitoring result to the online comparison monitoring device through a wireless network.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the utility model discloses a VOCS on-line monitoring system monitors environmental pollution through explosion-proof type net VOCS automatic monitoring device, VOCS early warning laser radar, VOCS boundary monitoring station, fixed pollution sources VOCS automatic monitoring device, and monitoring result sends through wireless network and gathers for online contrast monitoring device and handle, and managers can look over the monitoring result that online contrast monitoring device obtained through VOCS online management and control and early warning platform. The utility model discloses a VOCS on-line monitoring system, can reduce the work load that environmental management personnel's data acquisition and report, directly gather the conveying by the terminal and type in emission data and pollutant data, realize the automation of data and gather and report on the management aspect, also can perfect and standardize the regional decomposition work and the data report work of reducing discharging responsibility target from this, multiple data assemble the transmission, directly transmit data to the supervision platform in unison, the comprehensive information evaluation service, to regional space geography in the whole, environmental data manages, the inquiry, the analysis, spatial distribution through analysis information, monitoring information's time sequence changes, make a large amount of abstractions, boring data become directly perceived, lively and easily understand, show various environment special subject content, data spatial distribution and quantity statistics law.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural diagram of a VOCS online monitoring system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, the utility model discloses a VOCS on-line monitoring system includes: VOCS online control and early warning platform 1, online contrast monitoring devices 2, explosion-proof type grid VOCS automatic monitoring devices 3, VOCS early warning laser radar 4, VOCS boundary monitoring station 5, fixed pollution source VOCS automatic monitoring devices 6, removal VOCS monitoring vehicle 7, environmental sensitivity point VOCS foul monitoring station 8, soil underground VOCS detection device 9 and natural gas well head VOCS monitoring devices 10.
Explosion-proof type net VOCS automatic monitoring device 3, VOCS early warning laser radar 4, VOCS border monitoring station 5, fixed pollution source VOCS automatic monitoring device 6, removal VOCS monitoring vehicle 7, environmental sensitivity point VOCS foul monitoring station 8, soil underground VOCS detection device 9 and natural gas well head VOCS monitoring device 10 are connected with online contrast monitoring device 2 through wireless network respectively. Each device can send the data collected to the online contrast monitoring device 2 for processing, and the online contrast monitoring device 2 can store the processed data together with the data sent by each device. After the online comparison monitoring device 2 processes the received data, the processed data can be sent to the online control and early warning platform 1 which can process the processed data VOCS. The online comparison monitoring device 2 is connected with the VOCS online control and early warning platform 1 through a wireless network or a wired network. In this embodiment, the wireless network may be 2G, 3G, 4G, or WIFI, and this application is not specifically limited.
The automatic monitoring device 3 for the explosion-proof grid VOCS is completely explosion-proof, and can meet the requirement of 6-level explosion prevention on site. The device has the advantages of integrated modularization, strong stability, long service life, strong environmental suitability and stable work in winter. The PID detector is arranged in the explosion-proof grid VOCS automatic monitoring device 3, the total VOC and non-methane total hydrocarbon in the air can be effectively detected by the PID detector, and the detection precision can reach the PPB level. The explosion-proof grid VOCS automatic monitoring device 3 can effectively monitor the concentration distribution conditions of Volatile Organic Compounds (VOCs) in industrial parks, gas stations and petrochemical tank areas in a point distribution mode, form a 600 m-600 m grid monitoring system and is favorable for troubleshooting and tracing pollution sources. Meanwhile, the explosion-proof grid VOCS automatic monitoring device 3 is provided with an over-standard alarm device, and plays roles of early warning and prompting. Through networking platform and combination GIS map, can effectively monitor VOCs's the pollution situation in the whole region, administer and investigate hidden danger for the later stage and provide data support. Monitoring data of the automatic monitoring device 3 for the VOCS of the explosion-proof grid can be butted with the VOCS early warning laser radar 4 to be used as a calibration point of the concentration level distribution of the total VOCS amount.
VOCS early warning laser radar 4 passes through laser scanning monitoring VOCS and particulate matter concentration, can carry out vertical scanning, horizontal scanning and tangent plane scanning. The vertical scanning can be used for three-dimensionally monitoring the high-altitude concentration distribution and migration rule of VOCs and particulate matters in the range of a factory and a park. The influence of VOCs and particulate matter concentration distribution, the pursuit pollutant inorganization emission to the surrounding environment in the horizontal scanning can the scanning zone, and the early warning monitoring tangent plane scanning that pollutes the traceability and pollutant diffusion dynamic tracking can the concentration change of pollutant diffusion scope, VOCs and particulate matter of tangent plane monitoring factory area and living area. VOCS early warning laser radar 4 can monitor the pollutant distribution in the petrochemical enterprise factory boundary, and the pollutant is carried across the boundary, and the pollution is traced to the source to and pollutant diffusion dynamic tracking's early warning monitoring, effectively monitor the concentration distribution of VOCs and particulate matter. The scanning radius of the VOCS pre-warning lidar 4 can typically reach 10 km. The VOCS early warning laser radar 4 also has the functions of photographing and shooting, and can be used for conveniently checking and monitoring the pollution emission process in the whole plant area.
The VOCS boundary monitoring station 5 is used to monitor general pollutants, characteristic pollutants VOCS, malodorous sulfides and meteorological parameters. Common contaminants include: PM (particulate matter)10、PM2.5、SO2(H2S)、NOX(NH3) CO and O3(ii) a The characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons, benzene series, low volatility organics (C2-C6) and high volatility organics (C6-C12); malodorous sulfides include: carbon disulfide, methyl mercaptan, ethyl mercaptan,Dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
The automatic monitoring device 6 for the fixed pollution source VOCS adopts a gas chromatography and combines an extraction sampling method smoke dry-based pretreatment technology, is suitable for detecting the total emission amount of organic waste gas such as non-methane total hydrocarbon, benzene series and the like in the fixed pollution emission source, and transmits various data through a data acquisition and communication system. The automatic monitoring device 6 for the fixed pollution source VOCS can comprise an acquisition unit, an analysis unit, a smoke parameter measurement unit and a data acquisition, processing and communication unit. The acquisition unit can comprise a detection acquisition device such as a smoke sampling probe. The analysis unit can comprise a methane/non-methane total hearing online monitor, a benzene series online monitor, a zero gas generator and the like. The smoke parameter measuring unit comprises a temperature and pressure flow integrated measuring instrument, a humidity measuring instrument and the like. The data acquisition unit and the communication unit package can acquire, process, store and display data, and transmit the acquired and processed data to the online comparison monitoring device 2. The fixed pollution source VOCS automatic monitoring device 6 adopts a gas chromatography, an analysis method meets the industrial requirements, the measurement precision is high, a pretreatment method meets the fixed pollution source waste gas monitoring requirements, the operation stability is good, the whole sampling process is medium-temperature heat tracing, cold drying dehumidification and stable work, the data repeatability is good, the interface is friendly, the operation is convenient, the functions are complete, the use is flexible and convenient, the explosion-proof configuration is optional, and the safety and the reliability are realized.
The mobile VOCS monitoring vehicle 7 is used for monitoring characteristic pollutants VOCS, malodorous sulfides and meteorological parameters. The characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons, benzene series, low volatility organics (C2-C6) and high volatility organics (C6-C12); malodorous sulfides include: carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan, and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
And the environment sensitive point VOCS stink monitoring station 8 is used for monitoring characteristic pollutants VOCS, stink sulfides and meteorological parameters. The characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons and benzene series; malodorous sulfides include: carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan, and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
Soil underground VOCS detection device 9 can 24 hours incessant monitoring underground soil different degree of depth (2 meters, 4 meters, 6 meters, 8 meters and 10 meters) not methane total hydrocarbon, methane, petroleum hydrocarbon, carbon dioxide, oxygen, hydrogen sulfide, nitrous oxide, indexes such as pressure, humidity and temperature, and the measuring accuracy can reach the PPB rank, through wireless network, transmits monitoring result for online contrast monitoring devices 2. The soil underground VOCS detection device 9 is also provided with a deep well sampling system, can effectively ensure the effectiveness and the representativeness of sample gas, and is an effective tool for soil pollution general survey, soil pollution remediation and soil pollution early warning.
The natural gas wellhead VOCS monitoring device 10 can be usually installed at a natural gas wellhead, a gas chromatograph arranged in the natural gas wellhead VOCS monitoring device 10 is utilized to effectively monitor the sulfur content, the malodorous gas content and the component and heat value response of C1-C6 natural gas in the natural gas, data support is provided for the follow-up natural gas tail gas treatment, the VOCs total emission reduction and tax payment basis and the recovery of natural gas organic gas, and the natural gas wellhead VOCS monitoring device 10 is usually required to be provided with an explosion-proof cabin during installation
The utility model discloses a VOCS on-line monitoring system monitors environmental pollution through explosion-proof type net VOCS automatic monitoring device, VOCS early warning laser radar, VOCS boundary monitoring station, fixed pollution sources VOCS automatic monitoring device, and monitoring result sends through wireless network and gathers for online contrast monitoring device and handle, and managers can look over the monitoring result that online contrast monitoring device obtained through VOCS online management and control and early warning platform. The utility model discloses a VOCS on-line monitoring system, can reduce the work load that environmental management personnel's data acquisition and report, directly gather the conveying by the terminal and type in emission data and pollutant data, realize the automation of data and gather and report on the management aspect, also can perfect and standardize the regional decomposition work and the data report work of reducing discharging responsibility target from this, multiple data assemble the transmission, directly transmit data to the supervision platform in unison, the comprehensive information evaluation service, to regional space geography in the whole, environmental data manages, the inquiry, the analysis, spatial distribution through analysis information, monitoring information's time sequence changes, make a large amount of abstractions, boring data become directly perceived, lively and easily understand, show various environment special subject content, data spatial distribution and quantity statistics law.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
- VOCS on-line monitoring system, characterized by that includes: the system comprises an explosion-proof grid VOCS automatic monitoring device, a VOCS early warning laser radar, a VOCS boundary monitoring station, a fixed pollution source VOCS automatic monitoring device, an online comparison monitoring device and a VOCS online control and early warning platform;the explosion-proof grid VOCS automatic monitoring device, the VOCS early warning laser radar, the VOCS boundary monitoring station and the fixed pollution source VOCS automatic monitoring device are respectively connected with the online contrast monitoring device through a wireless network, the online contrast monitoring device is connected with the VOCS online control and early warning platform through a wireless or wired network, and the wireless network comprises 2G, 3G, 4G or WIFI;and the online contrast monitoring device receives monitoring data sent by the explosion-proof grid VOCS automatic monitoring device, the VOCS early warning laser radar, the VOCS boundary monitoring station and the fixed pollution source VOCS automatic monitoring device, processes and stores the data, and sends a processing result to the VOCS online control and early warning platform.
- 2. The system according to claim 1, wherein a PID detector is arranged in the explosion-proof grid VOCS automatic monitoring device and is used for detecting VOCS total amount and non-methane total hydrocarbon in air; and the explosion-proof grid VOCS automatic monitoring device transmits the monitoring result to the online comparison monitoring device through a wireless network.
- 3. The system of claim 1, wherein the VOCS boundary monitoring station is configured to monitor normal pollutants, characteristic pollutants VOCS, malodorous sulfides, and meteorological parameters; the VOCS boundary monitoring station transmits a monitoring result to an online comparison monitoring device through a wireless network;the common contaminants include: PM (particulate matter)10、PM2.5、SO2NOX, CO and O3(ii) a The characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons, benzene series, low volatile organic compounds and high volatile organic compounds; the malodorous sulphide comprises: carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan, and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
- 4. The system of claim 1, further comprising an environmental sensitive point VOCS malodor monitoring station; the environment sensitive point VOCS stink monitoring station is used for monitoring characteristic pollutants VOCS, stink sulfides and meteorological parameters; the environment sensitive point VOCS stink monitoring station transmits a monitoring result to an online comparison monitoring device through a wireless network;the characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons and benzene series; the malodorous sulphide comprises: carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan, and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
- 5. The system of claim 1, further comprising a mobile VOCS monitoring vehicle; the mobile VOCS monitoring vehicle is used for monitoring characteristic pollutants VOCS, malodorous sulfides and meteorological parameters; the mobile VOCS monitoring vehicle transmits a monitoring result to an online comparison monitoring device through a wireless network;the characteristic contaminant VOCS includes: methane, non-methane total hydrocarbons, benzene series, low volatile organic compounds and high volatile organic compounds; the malodorous sulphide comprises: carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, dimethyl disulfide, diethyl sulfate, isopropyl mercaptan, and tert-butyl mercaptan; the meteorological parameters include: wind direction, wind speed, temperature, humidity, and pressure.
- 6. The system of claim 1, wherein the VOCS pre-warning laser radar monitors VOCS and particulate matter concentration by laser scanning, including vertical scanning, horizontal scanning, and sectional scanning; and the VOCS early warning laser radar transmits the monitoring result to an online comparison monitoring device through a wireless network.
- 7. The system of claim 1, wherein the VOCS early warning lidar further comprises camera and video capabilities.
- 8. The system of claim 1, further comprising a subsurface VOCS detection device; the soil underground VOCS detection device is used for monitoring non-methane total hydrocarbons, methane, petroleum hydrocarbons, carbon dioxide, oxygen, hydrogen sulfide, nitrous oxide, pressure, humidity and temperature at different depths of underground soil; the soil underground VOCS detection device transmits a monitoring result to an online comparison monitoring device through a wireless network; the underground soil VOCS detection device also has a soil sampling function.
- 9. The system of claim 1, further comprising a natural gas wellhead VOCS monitoring device; the natural gas wellhead VOCS monitoring device is internally provided with a gas chromatograph, and the sulfur content, the content of malodorous gas and the components and heat value response of C1-C6 natural gas in the natural gas are monitored through the gas chromatograph; and the natural gas wellhead VOCS monitoring device transmits the monitoring result to the online comparison monitoring device through a wireless network.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111831781A (en) * | 2020-07-24 | 2020-10-27 | 北京环拓科技有限公司 | Method for acquiring high-precision VOC concentration distribution data |
| CN112816541A (en) * | 2020-12-31 | 2021-05-18 | 山西清环能创环境科技有限公司 | Poisonous and odorous gas detection and monitoring system containing VOCs |
| CN113311090A (en) * | 2021-06-03 | 2021-08-27 | 南京霍普斯科技有限公司 | Online integrated monitoring system and detection method for volatile organic compounds and malodorous substances of fixed pollution source |
| CN113533683A (en) * | 2021-06-02 | 2021-10-22 | 广东新泓环境咨询有限公司 | Surface soil petroleum hydrocarbon pollution early warning method and system |
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2019
- 2019-05-17 CN CN201920720446.XU patent/CN210894247U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111831781A (en) * | 2020-07-24 | 2020-10-27 | 北京环拓科技有限公司 | Method for acquiring high-precision VOC concentration distribution data |
| CN111831781B (en) * | 2020-07-24 | 2024-05-21 | 河北富湾科技有限公司 | Method for acquiring high-precision VOC concentration distribution data |
| CN112816541A (en) * | 2020-12-31 | 2021-05-18 | 山西清环能创环境科技有限公司 | Poisonous and odorous gas detection and monitoring system containing VOCs |
| CN113533683A (en) * | 2021-06-02 | 2021-10-22 | 广东新泓环境咨询有限公司 | Surface soil petroleum hydrocarbon pollution early warning method and system |
| CN113311090A (en) * | 2021-06-03 | 2021-08-27 | 南京霍普斯科技有限公司 | Online integrated monitoring system and detection method for volatile organic compounds and malodorous substances of fixed pollution source |
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