CN102295370B - Treating system and method for waste liquid generated in washing of soil polluted by polycyclic aromatic hydrocarbons - Google Patents
Treating system and method for waste liquid generated in washing of soil polluted by polycyclic aromatic hydrocarbons Download PDFInfo
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Abstract
The invention provides a treating system and method for waste liquid generated in washing of soil polluted by polycyclic aromatic hydrocarbons. The treating system comprises a pretreatment unit, a coagulation and sedimentation unit, an ozone oxidation unit, an effluent reusing unit, a tail gas treatment unit and a sludge disposal unit in sequential connection. A water distributing system used in the invention is of an umbrella shape. An aeration system employed in the invention is a microporous titanium aerator. An ozone generator utilized in the invention comprises an air compressor set, a lyophilizer, an oxygen making set and an ozone generating unit. According to the invention, waste liquid generated in washing of soil polluted by polycyclic aromatic hydrocarbons is the target of the invention; based on the characteristic that the waste liquid contains fine soil particles and a great amount of polycyclic aromatic hydrocarbons, coagulation and sedimentation as well as ozone oxidation are used as main treating techniques to rapidly and effectively remove polycyclic aromatic hydrocarbons in the waste liquid, and treated liquid can be recycled in a soil washing system, thereby realizing zero discharge of waste water in the technology of soil washing.
Description
Technical field
The invention belongs to the field of waste water treatment in the contaminated soil washing recovery technique, be specifically related to a kind of system and method for the treatment of polycyclic aromatic hydrocarbons contaminated soil scrub raffinate.
Background technology
The soil washing technology is a kind of recovery technique of processing the polycyclic aromatic hydrocarbons contaminated soil, it is that the soil that contaminated site excavates is out mixed in the drip washing reactor with leacheate through after the pre-treatment, under certain condition, by assisting of the external force such as stirring, contaminated soil and leacheate are had an effect, after most of pollutent was transferred to liquid phase in soil, the soil of isolating after the washing carried out backfill or advanced treatment, simultaneously after treatment reuse of leacheate or qualified discharge.Therefore, whether leacheate is processed efficiently to have become and is weighed the key factor that can the soil washing technology be used.
Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons, PAHs) refer to contain in the molecule hydrocarbon polymer of two or more phenyl ring, it is the material that is found to have the earliest environmental carcinogenesis, extensively be present in the industry waste water such as coking, petroleum refining, gasification, if without suitable processing, with the serious harm environment, and can enter human body with crossing food chain, HUMAN HEALTH is caused grave danger.
The technology of most important two kinds of degrading polycyclic aromatic hydrocarbons is biological degradation and high-level oxidation technology at present, and the two mechanism in effect complements one another.Biological degradation mainly is to utilize screening or degrade through the biological enzyme that domestication obtains, and needs the synergy of a plurality of enzymes in this degradation process, and the product of degraded much is the biological inoculum needed various raw material of surviving.Although biological degradation is comparatively economical, the research that how to obtain best biological enzyme also is in laboratory stage; And high-level oxidation technology is the new technology of the processing Persistent organic pollutants that grew up in nearly two, 30 years, it can make the organic pollutant oxidative degradation of the difficult degradations such as polycyclic aromatic hydrocarbons in the waste water become the small-molecule substance of nontoxic or low toxicity, even directly mineralising is carbonic acid gas and water.Therefore, take high-level oxidation technology as the basis, develop efficient polycyclic aromatic hydrocarbons contaminated soil scrub raffinate treatment technology, and carry out the developing direction that industrial applications has become this field.
The present invention is take polycyclic aromatic hydrocarbons contaminated soil scrub raffinate as object, for containing tiny soil particle, a large amount of characteristics such as polycyclic aromatic hydrocarbons in the waste liquid, employing is removed polycyclic aromatic hydrocarbons in the water fast and effectively take coagulating sedimentation+ozone oxidation as main treatment technology, water outlet can recycle in the soil washing system after processing, and has realized the wastewater zero discharge of soil washing technology.
Summary of the invention
The purpose of this invention is to provide a kind of Polycyclic aromatic hydrocarbon type polluted soil waste washing liquid treatment system and method, solve the technical problem that traditional method is difficult to remove efficiently, fast polycyclic aromatic hydrocarbons in the contaminated soil scrub raffinate; And solve that traditional method brings expensive, be difficult to the problem that recycles, waste more.
For achieving the above object, the present invention adopts following technical scheme:
A kind of Polycyclic aromatic hydrocarbon type polluted soil waste washing liquid treatment system is characterized in that: comprise that pretreatment unit, coagulating sedimentation unit, ozone oxidation unit, water outlet return for unit, tail gas treating unit and sludge disposal unit;
1), pretreatment unit: comprise equalizing tank and equalizing tank lift pump, the water-in of equalizing tank is communicated with the scrub raffinate water inlet pipe, is equipped with the equalizing tank lift pump in the equalizing tank, and the water outlet of equalizing tank lift pump is closed pipe and is communicated with the coagulating sedimentation unit;
2), coagulating sedimentation unit: comprise Cyclonic reactor, settling tank and coagulant drug-adding device, the Cyclonic reactor inlet duct is connected with coagulant drug-adding device, the Cyclonic reactor inlet duct is communicated with the import of settling tank, the supernatant liquor of settling tank goes out pipe and is communicated with intermediate pool, the bottom of settling tank is equipped with settling tank sludge lifting pump, and the riser tube of settling tank sludge lifting pump is communicated with the sludge disposal unit;
3), ozone oxidation unit: comprise intermediate pool, the intermediate pool lift pump, ozone contact tower and ozone generator group, the riser tube of intermediate pool lift pump is communicated with the water inlet pipe of ozone contact tower, the rising pipe of ozone contact tower returns for the unit with water outlet and is communicated with, the bottom pipeline of ozone contact tower is communicated with the ozone generator group, the ozone contact tower comprises the water distribution system of top of tower and the aerating system of tower inside, the ozone supply source of described aerating system is the ozone generator group, the ozone contact tower is encloses container, the top arranges offgas duct, and tail gas is connected to the aerofoil fan of tail gas treating unit by the tail gas connecting pipeline;
4), tail gas treating unit: comprise the aerofoil fan, catalyse pyrolysis tank and the chimney that are linked in sequence;
5), water outlet is returned for the unit: comprise that clean water basin and clean water basin return for pump, the waste water after the processing is stored in the clean water basin, and returns for the pump pump to soil washing system water spot by clean water basin;
6), sludge disposal unit: comprise sludge storage pool and be delivered to the sludge pump of sludge drying bed by sludge pipe.
Described water distribution system is the umbrella shape water distribution system.
Described aerating system is micropore titanium metal aerator.
Described ozone generator group comprises pneumatics unit, freeze drier, oxygenerator group and ozone generating unit.
A kind of polycyclic aromatic hydrocarbons contaminated soil scrub raffinate treatment process is characterized in that following steps are arranged:
Step 1, scrub raffinate are then delivered to the coagulating sedimentation unit by the equalizing tank lift pump with waste water from flowing in the equalizing tank, waste water in equalizing tank fully all with water quality and regulating pondage.
Step 2, in the Cyclonic reactor inlet duct by the coagulant drug-adding device dosing coagulant, make coagulating agent fully contact mixing with waste water, form flocks, and with waste water together from flowing into settling tank, tiny soil particle is able to remove from water by the gravity settling effect in settling tank, the gravity flow of settling tank supernatant liquor enters intermediate pool, and the settling tank substrate is promoted to the sludge disposal unit by settling tank sludge lifting pump.
Step 3, waste water are promoted to the ozone contact tower by the intermediate pool lift pump and react, polycyclic aromatic hydrocarbons is removed in this operation in the water, water outlet will be from flowing into back for the unit, residual ozone is passed through the tail gas connecting pipeline to the catalyse pyrolysis tank in the ozone contact tower, qualified discharge after treatment, the umbrella shape water distribution system of ozone contact top of tower reduce the water inlet flow velocity makes in the tower sewage fluidised form uniform and stable; The aerating system of ozone contact tower bottom mixes ozone by air chamber is set in tower, makes ozone be divided into some bubbles in small, broken bits by micropore titanium metal aerator again and enters tank body.
Waste water after step 4, the processing is stored in the clean water basin, and returns for the pump pump to soil washing system water spot by clean water basin.
Step 5, ozone in the ozone contact tower with the abundant contact reacts of waste water after, unnecessary ozone is connected to aerofoil fan by the tail gas connecting pipeline, after the catalyse pyrolysis tank is processed by smoke stack emission to atmosphere.
Step 6, precipitation substrate are delivered to sludge drying bed through sludge pump and carry out drying and other treatment after further concentrating in sludge storage pool.
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention has overcome expensive that traditional method brings, be difficult to recycle, the shortcoming of many wastes, having solved traditional method is difficult to efficiently, remove fast the technical problem of polycyclic aromatic hydrocarbons in the contaminated soil scrub raffinate, take polycyclic aromatic hydrocarbons contaminated soil scrub raffinate as object, for containing tiny soil particle in the waste liquid, a large amount of characteristics such as polycyclic aromatic hydrocarbons, employing is removed polycyclic aromatic hydrocarbons in the water fast and effectively take coagulating sedimentation+ozone oxidation as main treatment technology, water outlet can recycle in the soil washing system after processing, and has realized the wastewater zero discharge of soil washing technology.
Description of drawings
Fig. 1 is flowage structure schematic diagram of the present invention.
Fig. 2 is ozone contact tower structure schematic diagram of the present invention.
Fig. 3 is umbrella shape water distribution system structural representation of the present invention.
Fig. 4 be among Fig. 3 A to diagrammatic cross-section.
Fig. 5 is aerating system structural representation of the present invention.
Fig. 6 be among Fig. 5 B to diagrammatic cross-section.
Fig. 7 is aerating system syndeton schematic diagram of the present invention.
Description of drawings: 1-scrub raffinate water inlet pipe, the 2-equalizing tank, 3-equalizing tank lift pump, the 4-under meter, the 5-Cyclonic reactor, the 6-coagulant drug-adding device, the 7-settling tank, 8-settling tank sludge lifting pump, the 9-intermediate pool, 10-intermediate pool lift pump, 11-ozone contact tower, 11.1-offgas duct, 11.2-water inlet pipe, 11.3-liquidometer, 11.4-manhole, 11.5-rising pipe, 11.6-drain, 11.7-ozone import, 11.8-connecting reinforcement, 11.9-umbrella shape water distribution system, 11.10-micropore titanium metal aerator, 11.11-perforation plate, 11.12-air chamber, 11.13-pad, 11.14-nut, 12-ozone generator group, the 13-clean water basin, the 14-clean water basin return for pump, 15-tail gas connecting pipeline, the 16-aerofoil fan, 17-catalyse pyrolysis tank, the 18-chimney, the 19-sludge storage pool, the 20-sludge pump.
Embodiment
Embodiment is referring to Fig. 1, shown in Figure 2, a kind of Polycyclic aromatic hydrocarbon type polluted soil waste washing liquid treatment system is characterized in that: comprise that pretreatment unit, coagulating sedimentation unit, ozone oxidation unit, water outlet return for unit, tail gas treating unit and sludge disposal unit;
1), pretreatment unit: comprise equalizing tank 2 and equalizing tank lift pump 3, the water-in of equalizing tank 2 is communicated with scrub raffinate water inlet pipe 1, is equipped with equalizing tank lift pump 3 in the equalizing tank 2, and the water outlet of equalizing tank lift pump 3 is closed pipe and is communicated with the coagulating sedimentation unit;
2), coagulating sedimentation unit: comprise Cyclonic reactor 5, settling tank 7 and coagulant drug-adding device 6, Cyclonic reactor 5 inlet ducts are connected with coagulant drug-adding device 6, Cyclonic reactor 5 inlet ducts are communicated with the import of settling tank 7, the supernatant liquor of settling tank 7 goes out pipe and is communicated with intermediate pool 9, the bottom of settling tank 7 is equipped with settling tank sludge lifting pump 8, and the riser tube of settling tank sludge lifting pump 8 is communicated with the sludge disposal unit;
3), ozone oxidation unit: comprise intermediate pool 9, intermediate pool lift pump 10, ozone contact tower 11 and ozone generator group 12, the riser tube of intermediate pool lift pump 10 is communicated with the water inlet pipe 11.2 of ozone contact tower 11, rising pipe 11.5 and the water outlet of ozone contact tower 11 returned for the unit and is communicated with, the bottom pipeline of ozone contact tower 11 is communicated with ozone generator group 12, ozone contact tower 11 comprises the water distribution system of top of tower and the aerating system of tower inside, the ozone supply source of described aerating system is ozone generator group 12, ozone contact tower 11 is encloses container, the top arranges offgas duct 11.1, and tail gas is connected to the aerofoil fan 16 of tail gas treating unit by tail gas connecting pipeline 15;
4), tail gas treating unit: comprise the aerofoil fan 16, catalyse pyrolysis tank 17 and the chimney 18 that are linked in sequence;
5), water outlet is returned for the unit: comprise that clean water basin 13 and clean water basin return for pump 14, the waste water after the processing is stored in the clean water basin 13, and returns for pump 14 pumps to soil washing system water spot by clean water basin;
6), sludge disposal unit: comprise sludge storage pool 19 and be delivered to the sludge pump 20 of sludge drying bed by sludge pipe.
Referring to Fig. 2, Fig. 3, Fig. 4, described water distribution system is shaped as umbrella shape, is that 3 connecting reinforcements 11.8 of 120 ° are connected with tower body by spacing.Umbrella shape water distribution system 11.9 bottom surface diameters are 400-700mm, and height is 200-350mm, are 300-500mm apart from the tower body highest point simultaneously.When waste water enters tower body by water inlet pipe 11.2, water distribution system is set had both reduced flow velocity, also change water intake mode, so that waste water becomes low speed and is multidirectional planar and ozone contact reaction by being single column enters tower body at a high speed.
Referring to Fig. 2, Fig. 5, Fig. 6, Fig. 7, described aerating system comprises perforation plate 11.11, micropore titanium metal aerator 11.10.Perforation plate 11.11 adopts welding process to be connected with tower body, can form the air chamber 11.12 with a constant volume, and it is 200-400mm apart from the tower body lowest part.Micropore titanium metal aerator 11.10 is that the high purity titanium metal-powder is through cold isostatic compaction, have the characteristics such as corrosion-resistant, anti-oxidant, lightweight, that bubble is even, its bottom is designed for outside screw, and employing thread connecting mode and perforation plate 11.11 are fixed by matching nut.During work, ozone is introduced into air chamber 11.12 by shock absorption, mixes, and by aerator ozone is cut into some bubbles in small, broken bits again, and is discharged into uniformly tower body, makes it fully to contact with waste water, has reached the purpose of removing pollutent.
Described coagulating agent is 26% polymerize aluminum chloride.
Described ozone generator group 12 comprises pneumatics unit, freeze drier, oxygenerator group and ozone generating unit.
A kind of polycyclic aromatic hydrocarbons contaminated soil scrub raffinate treatment process is characterized in that following steps are arranged:
Step 1, scrub raffinate are then delivered to the coagulating sedimentation unit by equalizing tank lift pump 3 with waste water from flowing in the equalizing tank 2, waste water equalizing tank 2 interior fully all with water quality and regulating pondage.。
Step 2, in Cyclonic reactor 5 inlet ducts by coagulant drug-adding device 6 dosing coagulants, make coagulating agent fully contact mixing with waste water, form flocks, and with waste water together from flowing into settling tank 7, tiny soil particle is able to remove from water by the gravity settling effect in settling tank 7, the gravity flow of settling tank supernatant liquor enters intermediate pool 9, and the settling tank substrate is promoted to the sludge disposal unit by settling tank sludge lifting pump 8.
Step 3, waste water are promoted to ozone contact tower 11 by intermediate pool lift pump 10 and react, polycyclic aromatic hydrocarbons is removed in this operation in the water, water outlet will be from flowing into back for the unit, ozone contact tower 11 interior residual ozone are passed through tail gas connecting pipeline 15 to catalyse pyrolysis tank 17, qualified discharge after treatment, the umbrella shape water distribution system 11.9 at ozone contact tower 11 tops reduce the water inlet flow velocitys makes in the tower sewage fluidised form uniform and stable; The aerating system of ozone contact tower 11 bottoms mixes ozone by air chamber 11.12 is set in tower, makes ozone be divided into some bubbles in small, broken bits by micropore titanium metal aerator 11.10 again and enters tank body.
Waste water after step 4, the processing is stored in the clean water basin 13, and returns for pump 14 pumps to soil washing system water spot by clean water basin.
Step 5, ozone in ozone contact tower 11 with the abundant contact reacts of waste water after, unnecessary ozone is connected to aerofoil fan 16 by tail gas connecting pipeline 15, after catalyse pyrolysis tank 17 is processed by smoke stack emission to atmosphere.
Step 6, precipitation substrate are delivered to sludge drying bed through sludge pump 20 and carry out drying and other treatment after further concentrating in sludge storage pool 19.
The concrete example that uses of this invention: this system is used for certain coke-oven plant's polycyclic aromatic hydrocarbon pollution washing technology and processes engineering, and this project is that discontinuity is processed, and it produces wastewater flow rate is 10m
3/ d is therefore the Waste Water Treatment scale is 1m
3/ h.Main technologic parameters is as follows:
Equalizing tank basin's effective volume: 10m
3
The Cyclonic reactor residence time: 10min
The settling tank residence time: 2h
Intermediate pool basin's effective volume: 3m
3
The ozone contact tower residence time: 2h
Ozone generator group outlet ozone concn: be not less than 40mg/L
Total polycyclic aromatic hydrocarbons starting point concentration is 1800-2000 g/L in the actual waste liquid, is 1116-1240 g/L through going out water concentration behind the coagulation process, and clearance is 38%, is 72-80 g/L through final outflow water concentration behind the ozonation technology, and total clearance is 96%.
Claims (4)
1. Polycyclic aromatic hydrocarbon type polluted soil waste washing liquid treatment system is characterized in that: comprise that pretreatment unit, coagulating sedimentation unit, ozone oxidation unit, water outlet return for unit, tail gas treating unit and sludge disposal unit;
1), pretreatment unit: comprise equalizing tank (2) and equalizing tank lift pump (3), the water-in of equalizing tank (2) is communicated with scrub raffinate water inlet pipe (1), be equipped with equalizing tank lift pump (3) in the equalizing tank (2), the rising pipe of equalizing tank lift pump (3) is communicated with the coagulating sedimentation unit;
2), coagulating sedimentation unit: comprise Cyclonic reactor (5), settling tank (7) and coagulant drug-adding device (6), Cyclonic reactor (5) inlet duct is connected with coagulant drug-adding device (6), Cyclonic reactor (5) outlet conduit is communicated with the import of settling tank (7), the rising pipe of settling tank (7) is communicated with intermediate pool (9), the bottom of settling tank (7) is equipped with settling tank sludge lifting pump (8), and the riser tube of settling tank sludge lifting pump (8) is communicated with the sludge disposal unit;
3), ozone oxidation unit: comprise intermediate pool (9), intermediate pool lift pump (10), ozone contact tower (11) and ozone generator group (12), intermediate pool lift pump (10) is connected between intermediate pool (9) and the ozone contact tower (11), the riser tube of intermediate pool lift pump (10) is communicated with the water inlet pipe (11.2) of ozone contact tower (11), rising pipe (11.5) and the water outlet of ozone contact tower (11) returned for the unit and is communicated with, the bottom pipeline of ozone contact tower (11) is communicated with ozone generator group (12), ozone contact tower (11) comprises the water distribution system of top of tower and the aerating system of tower bottom, the ozone supply source of described aerating system is ozone generator group (12), ozone contact tower (11) is encloses container, the top arranges offgas duct (11.1), and the tail gas that offgas duct is discharged is connected to the aerofoil fan (16) of tail gas treating unit by tail gas connecting pipeline (15);
4), tail gas treating unit: comprise the aerofoil fan (16), catalyse pyrolysis tank (17) and the chimney (18) that are linked in sequence;
5), water outlet is returned for the unit: comprise that clean water basin (13) and clean water basin return for pump (14), the waste liquid after the processing is stored in the clean water basin (13), and returns for pump (14) pump to soil washing system water spot by clean water basin;
6), sludge disposal unit: comprise sludge storage pool (19) and be delivered to the sludge pump (20) of sludge drying bed by sludge pipe;
Described aerating system is micropore titanium metal aerator (11.10);
Described ozone generator group (12) comprises pneumatics unit, freeze drier, oxygenerator group and ozone generating unit.
2. Polycyclic aromatic hydrocarbon type polluted soil waste washing liquid treatment system according to claim 1, it is characterized in that: described water distribution system is umbrella shape water distribution system (11.9), is that 3 connecting reinforcements (11.8) of 120 ° are connected with tower body by spacing; Umbrella shape water distribution system (11.9) bottom surface diameter is 400-700mm, and height is 200-350mm, is 300-500mm apart from the tower body highest point simultaneously; When waste liquid, arranges water distribution system and both reduced flow velocity when entering tower body by water inlet pipe (11.2), also change water intake mode, so that waste liquid becomes low speed and is multidirectional planar and ozone contact reaction by being single column enters tower body at a high speed.
3. polycyclic aromatic hydrocarbons contaminated soil scrub raffinate treatment process is characterized in that following steps are arranged:
Step 1, scrub raffinate are then delivered to the coagulating sedimentation unit by equalizing tank lift pump (3) with waste liquid from flowing in the equalizing tank (2), waste liquid in equalizing tank (2) abundant all with water quality and regulating pondage;
Step 2, in Cyclonic reactor (5) inlet duct of coagulating sedimentation unit by coagulant drug-adding device (6) dosing coagulant, make coagulating agent fully contact mixing with waste liquid, form flocks, and with waste liquid together from flowing into settling tank (7), tiny soil particle is able to remove from water by the gravity settling effect in settling tank (7), the gravity flow of settling tank supernatant liquor enters intermediate pool (9), and the precipitation substrate is promoted to the sludge disposal unit by settling tank sludge lifting pump (8);
Step 3, waste liquid are promoted to ozone contact tower (11) by intermediate pool lift pump (10) and react, polycyclic aromatic hydrocarbons is removed in this operation in the water, water outlet will be from flowing into back for the unit, the interior residual ozone of ozone contact tower (11) is connected to aerofoil fan (16) by tail gas connecting pipeline (15), after catalyse pyrolysis tank (17) is processed by smoke stack emission to atmosphere, the umbrella shape water distribution system (11.9) at ozone contact tower (11) top reduces the water inlet flow velocity makes the interior sewage fluidised form of tower uniform and stable; The aerating system of ozone contact tower (11) bottom mixes ozone by air chamber (11.12) is set in tower, makes ozone be divided into some bubbles in small, broken bits by micropore titanium metal aerator (11.10) again and enters tank body;
Waste liquid after step 4, the processing is stored in the clean water basin (13), and returns for pump (14) pump to soil washing system water spot by clean water basin;
Step 5, ozone in ozone contact tower (11) with the abundant contact reacts of waste liquid after, residual ozone is connected to aerofoil fan (16) by tail gas connecting pipeline (15), after catalyse pyrolysis tank (17) processing by smoke stack emission to atmosphere;
Step 6, precipitation substrate are delivered to sludge drying bed through sludge pump (20) and carry out drying and other treatment after further concentrating in sludge storage pool (19).
4. polycyclic aromatic hydrocarbons contaminated soil scrub raffinate treatment process according to claim 3, it is characterized in that: coagulating agent described in the step 2 is 26% polymerize aluminum chloride.
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| CN105000710A (en) * | 2015-07-15 | 2015-10-28 | 上海康恒环境股份有限公司 | Multi-mode mobile integrated wastewater treating equipment for repairing polluted soil and groundwater |
| CN105399180A (en) * | 2015-12-31 | 2016-03-16 | 杭州电子科技大学 | Method for recovering surfactant in soil eluting solution |
| CN105993726A (en) * | 2016-05-05 | 2016-10-12 | 上海师范大学 | Vegetable disease control method |
| CN108033591A (en) * | 2017-11-23 | 2018-05-15 | 南京大学 | A kind of coagulation-ozone oxidation combination carries out VB12The device and method of Wastewater Pretreatment |
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| US5330658A (en) * | 1993-03-17 | 1994-07-19 | Westinghouse Electric Corporation | Solution decontamination method using precipitation and flocculation techniques |
| EP1591422A4 (en) * | 2003-01-31 | 2007-10-03 | Idemitsu Kosan Co | Method of treating wastewater containing hardly decomposable harmful substances |
| CN100439256C (en) * | 2007-03-29 | 2008-12-03 | 浙江大学 | Preparing tea powder for treating waste water polluted by polycyclic aromatic hydrocarbon, and method of application |
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