CN102288457A - Portable system for collecting volatile gas in soil and collecting method thereof - Google Patents
Portable system for collecting volatile gas in soil and collecting method thereof Download PDFInfo
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Abstract
A portable system for collecting volatile gas in soil and a collecting method thereof are disclosed. The system comprises a gas guiding device, a gas guiding hose, a gas exhausting device and a collecting device, wherein the gas exhausting device is a portable collector which comprises a collector box, and a pressure gauge, a flowmeter, a gas exhausting pump, a battery, a gas inlet connecting pipe and a gas outlet connecting pipe which are all placed in the collector box; the pressure gauge and the flowmeter are arranged on the gas inlet connecting pipe; the gas exhausting pump is arranged on the gas outlet connecting pipe and driven by the battery; a gas inlet, a gas outlet, a gas return hole and a gas vent are formed on the collector box; and a standard quick joint is connected in each hole. The structure of the system is very simple, and the collection efficiency and collection effect thereof are very good; the collecting staff only needs to open a monitoring well and simply mounting the portable collector and a vacuum sampling box with the gas guiding hose without carrying lots of devices and without taking lots of time and labour for mounting in field; and the system is very simple and convenient to operate.
Description
Technical field
The invention belongs to contaminated site investigation and health risk assessment field, be specifically related to a kind of portable sampling device and a kind of method of gathering the contaminated site volatile organic gas that the contaminated site volatile organic gas is used of gathering.
Background technology
At present for the health risk assessment of volatility organic contamination in the contaminated site mainly based on the concentration of volatile organic matter in the soil, carry out simulation and forecast by RBCA_toolkit software, calculate different exposure concentrations and the health risks that expose crowd under the situations.But the evaluation result of a large amount of engineering practice both at home and abroad shows, adopts the risk result of this mode too conservative, and the final reparation target of formulating is too strict, causes rehabilitation cost too high.
For overcoming this problem that direct employing RBCA_toolkit brings, at present, one of external solution that adopts usually be gather in the Polluted area volatile organic gas and to paying close attention to the pollutant levels analysis, the corresponding migration models of substitution is afterwards calculated the exposure concentrations under the different situations, carries out follow-up health risk in conjunction with corresponding Risk Calculation model more at last and calculates.But so far, also do not have a kind of can the on-the-spot mancarried device of gathering the different depth volatile organic gas fast, after the collection personnel need carry large number quipments (pump housing, flowmeter etc.) and spend a large amount of time and efforts Installation and Debugging at the scene, just can collect volatile organic gas, and because very loaded down with trivial details and inconvenient of operation, may cause gathering gas concentration and actual gas concentration has certain deviation.
Summary of the invention
The purpose of this invention is to provide volatilization gas acquisition system and acquisition method thereof in a kind of portable soil, solve tradition and gather the equipment and the method complex structure of different depth volatile organic gas, manipulate loaded down with trivial details and not portative technical matters.
For achieving the above object, the present invention adopts following technical scheme: volatilization gas acquisition system in a kind of portable soil, include gas operated device, soft air-guide pipe, air extractor and gathering-device, wherein the inlet end of soft air-guide pipe is communicated with gas operated device, the outlet side of soft air-guide pipe is communicated with gathering-device by air extractor, also be provided with Sampler valves on the soft air-guide pipe, it is characterized in that: described air extractor is portable collector, this portable collector comprises the collector casing and is placed on the interior tensimeter of collector casing, flowmeter, aspiration pump, battery, inlet pipe connection, the connecting pipe of giving vent to anger, described tensimeter and flowmeter are located on the inlet pipe connection, described aspiration pump be located on the connecting pipe of giving vent to anger and aspiration pump by battery-operated, have air admission hole on the described collector casing, venthole, return-air hole and vent port be totally four holes, each Kong Zhongjun is connected with standard rapid-acting coupling, the inlet end of described inlet pipe connection is communicated with the outlet side of soft air-guide pipe by the standard rapid-acting coupling in the air admission hole, the outlet side of inlet pipe connection is connected with standard rapid-acting coupling in the venthole, the inlet end of the described connecting pipe of giving vent to anger is connected with standard rapid-acting coupling in the return-air hole, and the outlet side of the connecting pipe of giving vent to anger is communicated with ambient atmosphere by the standard rapid-acting coupling in the vent port.
Described gathering-device is the vacuum sampling box, has getter hole and aspirating hole on the vacuum sampling box, and also all is connected with standard rapid-acting coupling in getter hole and the aspirating hole.
Described gas operated device comprises stainless steel cylinder and is threaded in the stainless steel stifle of stainless steel cylinder upper end, described stainless steel cylinder comprises stainless steel base plate and stainless steel sidewall paneling, described stainless steel sidewall paneling is provided with vertical transverse joint spaced apart, and the inlet end of described soft air-guide pipe is connected with the stainless steel stifle by standard rapid-acting coupling.
The outlet side of the described connecting pipe of giving vent to anger is communicated with a gas outlet by the standard rapid-acting coupling in the vent port, and this gas outlet is communicated with atmosphere.
Be connected with handle on the described collector casing.
Getter hole on the described vacuum sampling box is communicated with the outlet side of a collector escape pipe by standard rapid-acting coupling, and the inlet end of collector escape pipe is communicated with the outlet side of inlet pipe connection by the standard rapid-acting coupling in the venthole on the portable collector; Aspirating hole on the described vacuum sampling box is communicated with the inlet end of a collector draft tube by standard rapid-acting coupling, and the outlet side of collector draft tube is communicated with the inlet end of the connecting pipe of giving vent to anger by the standard rapid-acting coupling in the return-air hole on the portable collector.
In the outside of collector casing, be connected with one between the standard rapid-acting coupling in the standard rapid-acting coupling in the described venthole and the return-air hole and be connected flexible pipe.
A kind of acquisition method of using volatilization gas acquisition system collection volatilization gas in the portable soil, it is characterized in that: step 1, bury gas operated device and soft air-guide pipe underground according to the projected depth of sampled point, and by corresponding standard construction monitor well, elevated above the soil in the outlet side of soft air-guide pipe, on soft air-guide pipe, connect Sampler valves simultaneously.
After step 2, monitor well are built up, close Sampler valves, stablize more than 48 hours.
Compared with prior art the present invention has following characteristics and beneficial effect: the invention provides a cover and can on-the-spotly gather the portable acquisition system of different depth volatile organic gas fast and use the method that this portable acquisition system is gathered volatile organic gas, after using acquisition system of the present invention and acquisition method to collect volatile organic gas, to paying close attention to the pollutant levels analysis, the corresponding migration models of substitution is afterwards calculated the exposure concentrations under the different situations, carry out follow-up health risk in conjunction with corresponding Risk Calculation model more at last and calculate, just can overcome that volatile organic matter causes the risk result too conservative in the direct employing RBCA_toolkit calculating contaminated site soil, it is too strict to repair target, the defective that rehabilitation cost is higher.
The structure of the acquisition system among the present invention is very simple, its collecting efficiency and collection effect are very good, the collection personnel need not to carry large number quipments and need not to spend at the scene a large amount of time and efforts to install, only need open monitor well, portable collector and vacuum sampling box and soft air-guide pipe simply installed get final product, operate very simple, convenience, and because operation becomes easy, so collection gas concentration and actual gas concentration deviation can not occur again yet.Described portable collector and vacuum sampling box can be carried use, and can being placed in the monitor well always, gas operated device, soft air-guide pipe and Sampler valves be not corroded, therefore can reuse for many years, greatly reduce the cost of gathering volatile organic gas.Described acquisition method can be gathered the volatile organic gas sample of Polluted area fast, makes more objective, the science of the investigation of contaminated site and risk assessment, has satisfied the needs that contaminated site carried out more objective pollution surveys and health risk assessment.
Description of drawings
The present invention will be further described in detail below in conjunction with accompanying drawing.
Fig. 1 is a synoptic diagram of the present invention.
Fig. 2 is the synoptic diagram of gas operated device.
Fig. 3 is the synoptic diagram of the portable collector among step 5 and six.
Fig. 4 is the synoptic diagram of the portable collector among step 3 and four.
Fig. 5 is the synoptic diagram of vacuum sampling box.
Reference numeral: 1-gas operated device, the 2-soft air-guide pipe, the 3-Sampler valves, the rapid-acting coupling of 4-standard, 5-collector casing, 5.1-air admission hole, 5.2-venthole, 5.3-return-air hole, 5.4-vent port, 6-vacuum sampling box, 6.1-getter hole, 6.2-aspirating hole, the 7-gas outlet, 8-gravel air guide layer, the dried bentonitic clay packed layer of 9-, the 10-bentonitic clay packed layer that wets, the 11-concrete layer, the 12-sleeve pipe, the 13-pipe cap, 14-stainless steel base plate, 15-stainless steel sidewall paneling, the 16-transverse joint, 17-stainless steel stifle, the 18-tensimeter, the 19-flowmeter, the 20-aspiration pump, the 21-battery, the 22-inlet pipe connection, 23-collector escape pipe, 24-collector draft tube, the 25-connecting pipe of giving vent to anger, 26-connects flexible pipe, the 27-handle.
Embodiment
Embodiment is referring to shown in Fig. 1-4, volatilization gas acquisition system in this portable soil, include gas operated device 1, soft air-guide pipe 2, air extractor and gathering-device, wherein the inlet end of soft air-guide pipe 2 is communicated with gas operated device 1, the outlet side of soft air-guide pipe 2 is communicated with gathering-device by air extractor, also is provided with Sampler valves 3 on the soft air-guide pipe 2.In the present embodiment, soft air-guide pipe 2 is the PU soft air-guide pipe, and is high pressure resistant corrosion-resistant, and the internal diameter of soft air-guide pipe is 6mm.
Referring to Fig. 1, Fig. 2, described gas operated device 1 comprises stainless steel cylinder and is threaded in the stainless steel stifle 17 of stainless steel cylinder upper end, described stainless steel cylinder comprises stainless steel base plate 14 and the stainless steel sidewall paneling 15 that is welded on the stainless steel base plate, described stainless steel sidewall paneling 15 is provided with vertical transverse joint 16 spaced apart, and the inlet end of described soft air-guide pipe 2 is connected with stainless steel stifle 17 by standard rapid-acting coupling 4; In the present embodiment, the internal diameter of gas operated device 1 is 60mm, high 285mm, stainless steel base plate 14, stainless steel sidewall paneling 15 and stainless steel stifle 17 all are to adopt thickness to make for the 3mm corrosion resistant plate, durable, the upper end of stainless steel sidewall paneling 15 is an external thread, and the internal thread corresponding with external thread arranged on the stainless steel stifle 17, and the upper end of stainless steel sidewall paneling 15 is threaded with stainless steel stifle 17; Stainless steel base plate 14 adopts no seam welding with stainless steel sidewall paneling 15 in the junction, the seam width of transverse joint 16 is 0.5mm, and the kerf spacing of transverse joint and transverse joint is 5mm.
Referring to Fig. 1, Fig. 3, Fig. 4, described air extractor is portable collector, this portable collector comprises collector casing 5 and the tensimeter 18 that is placed in the collector casing 5, flowmeter 19, aspiration pump 20, battery 21, inlet pipe connection 22, the connecting pipe 25 of giving vent to anger, described tensimeter 18 and flowmeter 19 are located on the inlet pipe connection 22, described aspiration pump 20 is located on the connecting pipe 25 of giving vent to anger and aspiration pump 20 is driven by battery 21, have air admission hole 5.1 on the described collector casing 5, venthole 5.2, return-air hole 5.3 and vent port 5.4 be totally four holes, each Kong Zhongjun is connected with standard rapid-acting coupling 4, the inlet end of described inlet pipe connection 22 is communicated with the outlet side of soft air-guide pipe 2 by the standard rapid-acting coupling in the air admission hole 5.1, the outlet side of inlet pipe connection 22 is connected with standard rapid-acting coupling in the venthole 5.2, the inlet end of the described connecting pipe 25 of giving vent to anger is connected with standard rapid-acting coupling in the return-air hole 5.3, and the outlet side of the connecting pipe 25 of giving vent to anger is communicated with ambient atmosphere by the standard rapid-acting coupling in the vent port 5.4; The outlet side of the described connecting pipe 25 of giving vent to anger is communicated with a gas outlet 7 by the standard rapid-acting coupling in the vent port 5.4, and this gas outlet 7 is communicated with atmosphere.Described standard rapid-acting coupling 4 is finished products of buying from market, and in the present embodiment, the internal diameter of standard rapid-acting coupling 4 is 6mm.The described collector casing 5 whole thickness that adopt are made for the 3mm corrosion resistant plate, also are connected with handle 27 on the collector casing 5.
Referring to Fig. 1, Fig. 3, Fig. 5, described gathering-device is a vacuum sampling box 6, has getter hole 6.1 and aspirating hole 6.2 on the vacuum sampling box 6, and also all is connected with standard rapid-acting coupling 4 in getter hole 6.1 and the aspirating hole 6.2.Vacuum sampling box 6 also is the standard device of outsourcing.
The volatilization gas acquisition system is gathered the acquisition method of volatilization gas in this application portable soil, and its step is as follows.
Referring to Fig. 4, in above-mentioned steps three and step 4,, be connected with one between the standard rapid-acting coupling in the standard rapid-acting coupling in the described venthole 5.2 and the return-air hole 5.3 and be connected flexible pipe 26 in the outside of collector casing 5.
Referring to Fig. 1, Fig. 3, Fig. 5, in above-mentioned steps five and step 6, getter hole 6.1 on the described vacuum sampling box 6 is communicated with the outlet side of collector escape pipe 23 by standard rapid-acting coupling, and the inlet end of collector escape pipe 23 is communicated with the outlet side of inlet pipe connection 22 by the standard rapid-acting coupling in the venthole on the portable collector 5.2; Aspirating hole 6.2 on the described vacuum sampling box 6 is communicated with the inlet end of collector draft tube 24 by standard rapid-acting coupling, and the outlet side of collector draft tube 24 is communicated with by the inlet end of the standard rapid-acting coupling in the return-air hole on the portable collector 5.3 with the connecting pipe 25 of giving vent to anger.
Described monitor well comprise be arranged at underground gravel air guide layer 8(gravel diameter 3mm), dried bentonitic clay packed layer 9, wet bentonitic clay packed layer 10 and concrete layer 11, and be inserted in the sleeve pipe 12 on the concrete layer 11 and cover pipe cap 13 in sleeve pipe 12 upper ends, the inlet end of described soft air-guide pipe 2 passes wet bentonitic clay packed layer 10 and dried bentonitic clay packed layer 9 backs successively, is inserted in the gravel air guide layer 8 from the lower ends downward of sleeve pipe 12.When not using, the upper end of soft air-guide pipe 2 and Sampler valves 3 are placed in the sleeve pipe 12.Pipe cap 13 is stamped in the upper end of described sleeve pipe 12, can be rainproof, can also make marks on the pipe cap 13 simultaneously, and play the sign effect.Described sleeve pipe 12 is the UPVC sleeve pipe, and is not only solid, also corrosion-resistant.
Invention of the present invention has been used for the gas collecting of certain coke-oven plant's health risk assessment process benzene Polluted area.According to the pollution situation of benzene in this coke-oven plant's soil and the underground water, in the crude benzol workshop and tar subsidiary factory region be provided with 7 sampled points, sampling depth is below ground 1.5m place.After using the present invention to gather volatile organic gas, volatile organic gas is sent to lab analysis pays close attention to pollutant benzene, and be benchmark with the benzene concentration, in conjunction with corresponding diffusion model and Risk Calculation model the population health risk in these two zones is calculated; Simultaneously, the result is directly adopted RBCA_Toolkit software with tradition, and benzene concentration is that the risk result that benchmark calculates under the corresponding exposure situation compares discovery in the underground water to reach in the soil, the former value-at-risk is low than the latter, the former value-at-risk of putting of difference maximum is the latter's 3%, the former value-at-risk of putting of difference minimum is the latter's 43%, and the mean value of both differences is that the former value-at-risk is the latter's 15%.
Claims (7)
1. volatilization gas acquisition system in the portable soil, include gas operated device (1), soft air-guide pipe (2), air extractor and gathering-device, wherein the inlet end of soft air-guide pipe (2) is communicated with gas operated device (1), the outlet side of soft air-guide pipe (2) is communicated with gathering-device by air extractor, also be provided with Sampler valves (3) on the soft air-guide pipe (2), it is characterized in that:
Described air extractor is portable collector, this portable collector comprises collector casing (5) and is placed on the interior tensimeter (18) of collector casing (5), flowmeter (19), aspiration pump (20), battery (21), inlet pipe connection (22), the connecting pipe (25) of giving vent to anger, described tensimeter (18) and flowmeter (19) are located on the inlet pipe connection (22), described aspiration pump (20) is located on the connecting pipe of giving vent to anger (25) and aspiration pump (20) is driven by battery (21), have air admission hole (5.1) on the described collector casing (5), venthole (5.2), return-air hole (5.3) and vent port (5.4) be totally four holes, each Kong Zhongjun is connected with standard rapid-acting coupling (4), the inlet end of described inlet pipe connection (22) is communicated with the outlet side of soft air-guide pipe (2) by the standard rapid-acting coupling in the air admission hole (5.1), the outlet side of inlet pipe connection (22) is connected with standard rapid-acting coupling in the venthole (5.2), the inlet end of the described connecting pipe of giving vent to anger (25) is connected with standard rapid-acting coupling in the return-air hole (5.3), and the outlet side of the connecting pipe of giving vent to anger (25) is communicated with ambient atmosphere by the standard rapid-acting coupling in the vent port (5.4);
Described gathering-device is vacuum sampling box (6), has getter hole (6.1) and aspirating hole (6.2) on the vacuum sampling box (6), and also all is connected with standard rapid-acting coupling (4) in getter hole (6.1) and the aspirating hole (6.2).
2. volatilization gas acquisition system in the portable soil according to claim 1, it is characterized in that: described gas operated device (1) comprises stainless steel cylinder and is threaded in the stainless steel stifle (17) of stainless steel cylinder upper end, described stainless steel cylinder comprises stainless steel base plate (14) and stainless steel sidewall paneling (15), described stainless steel sidewall paneling (15) is provided with vertical transverse joint (16) spaced apart, and the inlet end of described soft air-guide pipe (2) is connected with stainless steel stifle (17) by standard rapid-acting coupling (4).
3. volatilization gas acquisition system in the portable soil according to claim 1, it is characterized in that: the outlet side of the described connecting pipe of giving vent to anger (25) is communicated with a gas outlet (7) by the standard rapid-acting coupling in the vent port (5.4), and this gas outlet (7) is communicated with atmosphere.
4. volatilization gas acquisition system in the portable soil according to claim 1 is characterized in that: be connected with handle (27) on the described collector casing (5).
5. according to volatilization gas acquisition system in claim 1 or 2 or the 3 or 4 described portable soils, it is characterized in that: the getter hole (6.1) on the described vacuum sampling box (6) is communicated with the outlet side of a collector escape pipe (23) by standard rapid-acting coupling, and the inlet end of collector escape pipe (23) is communicated with by the outlet side of the standard rapid-acting coupling in the venthole on the portable collector (5.2) with inlet pipe connection (22); Aspirating hole (6.2) on the described vacuum sampling box (6) is communicated with the inlet end of a collector draft tube (24) by standard rapid-acting coupling, and the outlet side of collector draft tube (24) is communicated with by the inlet end of the standard rapid-acting coupling in the return-air hole on the portable collector (5.3) with the connecting pipe of giving vent to anger (25).
6. according to volatilization gas acquisition system in claim 1 or 2 or the 3 or 4 described portable soils, it is characterized in that: be connected with one between the standard rapid-acting coupling in the outside in collector casing (5), the standard rapid-acting coupling in the described venthole (5.2) and return-air hole (5.3) and be connected flexible pipe (26).
7. use the acquisition method that volatilization gas acquisition system in the portable soil is gathered volatilization gas for one kind, it is characterized in that:
Step 1, bury gas operated device (1) and soft air-guide pipe (2) underground, and build monitor well, elevated above the soil in the outlet side of soft air-guide pipe (2), go up at soft air-guide pipe (2) simultaneously and connect Sampler valves (3) by corresponding standard according to the projected depth of sampled point;
After step 2, monitor well are built up, close Sampler valves (3), stablize more than 48 hours;
Step 3, the standard rapid-acting coupling (4) in the air admission hole (5.1) on the outlet side of soft air-guide pipe (2) and the portable collector is connected, soft air-guide pipe (2) is communicated with inlet pipe connection (22), the outlet side of inlet pipe connection (22) is communicated with the inlet end of the connecting pipe of giving vent to anger (25), is i.e. connects flexible pipe (26) between the standard rapid-acting coupling in standard rapid-acting coupling in venthole (5.2) and the return-air hole (5.3);
Step 4, the aspiration pump of opening in the portable collector (20) are bled, and when the gas bleeding volume is about 3～5 times of active volume of gas operated device (1) and soft air-guide pipe (2), close aspiration pump (20);
Step 5, disconnection inlet pipe connection (22) is communicated with the connecting pipe of giving vent to anger (25), the inlet end of collector escape pipe (23) is connected with standard rapid-acting coupling in the venthole (5.2), the outlet side of collector escape pipe (23) is connected with standard rapid-acting coupling in getter hole (6.1), inlet pipe connection (22) is communicated with vacuum sampling box (6), simultaneously the outlet side of collector draft tube (24) is connected with standard rapid-acting coupling in the return-air hole (5.3), the inlet end of collector draft tube (24) is connected with standard rapid-acting coupling in the aspirating hole (6.2), the connecting pipe of giving vent to anger (25) is communicated with vacuum sampling box (6);
Step 6, open aspiration pump (20) and carry out sample collecting, and will gather good sample and in 24 hours, be sent to the laboratory and carry out follow-up analysis on monitoring result and health risk calculating.
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| CN 201110121263 CN102288457B (en) | 2011-05-11 | 2011-05-11 | Portable system for collecting volatile gas in soil and collecting method thereof |
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| CN 201110121263 CN102288457B (en) | 2011-05-11 | 2011-05-11 | Portable system for collecting volatile gas in soil and collecting method thereof |
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