CN204138447U - A kind of aeration horizontal-flow grit chamber - Google Patents

A kind of aeration horizontal-flow grit chamber Download PDF

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Publication number
CN204138447U
CN204138447U CN201420597538.0U CN201420597538U CN204138447U CN 204138447 U CN204138447 U CN 204138447U CN 201420597538 U CN201420597538 U CN 201420597538U CN 204138447 U CN204138447 U CN 204138447U
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Prior art keywords
aeration
horizontal
grit chamber
sand
flow grit
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CN201420597538.0U
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Inventor
熊建英
赵国志
杨姝君
戴小冬
沈昌明
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Abstract

The utility model provides a kind of aeration horizontal-flow grit chamber, relates to water-treatment technology field, cannot ensure desanding effect for existing horizontal-flow grit chamber, and carbon source loss is large; And aerated grit chamber easily causes excess aeration, all affect the problem of subsequent biological treatment technique, it comprises at least one group of single pond be set up in parallel; Often organize single pond comprise communicate successively inhalant region, aerated grit chamber, horizontal-flow grit chamber and exhalant region, aerated grit chamber comprises the aeration section and skimming district that communicate, and the sand collecting hopper be positioned at bottom aeration section, the top of aeration section first barricade is provided with into water drowned weir, between aeration section and skimming district, the top of the second barricade is provided with water outlet drowned weir, the water inlet training wall that skimming district is opened wide by bottom and horizontal-flow grit chamber are separated, and the top of the third gear wall of horizontal-flow grit chamber is provided with effluent weir; Be provided with aerating apparatus in aeration section, be provided with oil removing skimmer device in skimming district, in horizontal-flow grit chamber, be provided with sand removing device.

Description

A kind of aeration horizontal-flow grit chamber
Technical field
The utility model relates to water-treatment technology field, particularly a kind of aeration horizontal-flow grit chamber.
Background technology
There is the inorganic particle impurity such as the mud of some amount, sand, cinder in municipal effluent, be the interference preventing inorganic particle impurity from running biological treatment system and sludge treating system, settling pit need be set before sewage second-level process.
At present, common settling pit comprises horizontal-flow grit chamber and aerated grit chamber etc., for removing relative density 2.65, and the sand grains of more than particle diameter 0.2mm.Wherein, horizontal-flow grit chamber adopts the pattern of advection, and sand grains is in free sedimentation state, only need control suitable horizontal flow velocity and fashionable colors, and the sand grains being greater than a certain relative density and particle diameter just can be made to sink and remove.But in actual moving process; when water quality and quantity fluctuation is larger, horizontal-flow grit chamber cannot be guaranteed to the removal effect of sand grains, simultaneously; because horizontal-flow grit chamber does not possess the ability of separation of organic substances; there is the organism of nearly 15% can be attached to its sedimentation on sand grains in sewage, thus add the loss of water-inlet carbon source, be unfavorable for subsequent biological treatment technique; and; adhere to organic sand grains also to need to carry out special washed-out sand technique, to avoid environmental pollution, cause sand removing process using comparatively loaded down with trivial details.
Aerated grit chamber produces density difference by aeration, and make sewage laterally form eddy flow and helically stream is pushed ahead, aeration makes inorganic particle impurity mutually collide and rubs, thus removes the partial organic substances of inorganic particle surfaces attachment.Simultaneously; due to the centrifugal force that eddy flow produces; the inorganic particle that relative density is larger can be thrown toward pool wall and sink at the bottom of pond; relative density less organism is then gone out aerated grit chamber to the centre of current by water-band; therefore; sand setting and washed-out sand process can complete simultaneously in aerated grit chamber, finally obtain purer sand grains, are convenient to subsequent disposal.In addition, due to the air supporting effect of aeration, the oil substances in sewage can emerge, and reaches the object that water is separating of oil.But aerated grit chamber is difficult to control aeration rate in actual motion, often causes excess aeration, be that the biological treatment of anaerobism or anoxic condition is totally unfavorable to subsequent technique.
Therefore, how to develop a kind of settling pit that can reduce water-inlet carbon source loss while removing inorganic particle, become the problem that those skilled in the art constantly explore.
Summary of the invention
For existing horizontal-flow grit chamber when water quality and quantity fluctuation is larger, desanding effect cannot be ensured, and carbon source loss is large, is unfavorable for subsequent biological treatment technique; And aerated grit chamber easily causes excess aeration, affect the problem of the biological treatment of follow-up anaerobism or anoxic, the purpose of this utility model is to provide a kind of aeration horizontal-flow grit chamber, and its sand setting is effective, can reduce water-inlet carbon source loss while desanding.
The utility model solves the aeration horizontal-flow grit chamber that its technical problem adopts, and comprises at least one group of parallel and single pond be set up in parallel, often organize described single pond comprise communicate successively inhalant region, aerated grit chamber, horizontal-flow grit chamber and exhalant region, described aerated grit chamber comprises the aeration section and skimming district that communicate, and the sand collecting hopper be positioned at bottom described aeration section, described skimming district is positioned between described aeration section and described horizontal-flow grit chamber, the top of first barricade away from side, described skimming district of described aeration section is provided with into water drowned weir, between described aeration section and described skimming district, the second barricade is set, and the top of described second barricade is provided with water outlet drowned weir, and the height of described water outlet drowned weir is lower than the height of described water inlet drowned weir, the water inlet training wall that described skimming district is opened wide by bottom and described horizontal-flow grit chamber are separated, the top of third gear wall relative with described water inlet training wall in described horizontal-flow grit chamber is provided with effluent weir, be provided with aerating apparatus in described aeration section, be provided with oil removing skimmer device in described skimming district, in described horizontal-flow grit chamber, be provided with sand removing device.
Preferably, described aeration section comprises the sediment by aeration district and oily water separation district that communicate, arrange the partition wall that bottom opens wide and separate, and described oily water separation district is near described skimming district between described sediment by aeration district and described oily water separation district.
When described single pond for organizing more, the inhalant region in described single pond communicates, and the exhalant region in described single pond also communicates.
Better, described aeration section cross section is in square, and described sand collecting hopper is orthopyramid shape, and the angle of its sidewall and horizontal plane is 55 ° ~ 60 °.
Preferably, the sidewall of described sand collecting hopper is also provided with sand suction pipe, and described sand suction pipe stretches into the bottom of described sand collecting hopper, and described sand suction pipe is communicated with the external sand pump be arranged at outside described aeration section.
Preferably, described sand removing device comprises the suction sand purlin car be arranged in described horizontal-flow grit chamber and the sand pump be installed on the car of suction sand purlin, and described suction sand purlin car is communicated with the sand catcher of encorbelmenting outside described horizontal-flow grit chamber.
Preferably, described aeration horizontal-flow grit chamber also comprises grit water separator, and described grit water separator is communicated with described sand suction pipe with described sand catcher respectively.
Preferably, described aerating apparatus comprises aeration tube and aeration pump, and described aeration tube is installed on the sidewall of the first barricade in described sediment by aeration district, and described aeration tube is connected with blower fan, arranges described aeration pump in described oily water separation district.
The bottom of described water inlet training wall has one near the kink of described second barricade, and the axis of described kink and the axis of described water inlet training wall have an angle α, and 20 °≤α≤40 °.
Better, described angle α is 30 °.
Effect of the present utility model is: aeration horizontal-flow grit chamber of the present utility model; by the aeration pre-treatment in aerated grit chamber aeration section; the organic granular impurity in sewage is made to be in suspended state; sand grains rubs mutually and bears the shearing force of aeration; the organic pollutant that sand grains adheres to is removed; be conducive to isolating comparatively pure inorganic grit; under the centrifugal action of eddy flow; the inorganic grit that density is larger is thrown toward aeration section outside and sinks to sand collecting hopper to discharge outside pond, and the less organism of density is then with flowing into skimming district before current direction.Aeration section realizes oily water separation by air supporting effect, oil slick after oily water separation and scum silica frost are discharged outside pond by skimming district again that be communicated with aeration section, solve the problem of the oil removing slagging-off of organic granular impurity in waste water, sewage after skimming district oil removing slagging-off enters horizontal-flow grit chamber, fail to continue to be deposited at horizontal-flow grit chamber at the sand grains of aeration section sedimentation, the sand setting quality of horizontal-flow grit chamber is guaranteed, therefore, aeration horizontal-flow grit chamber of the present utility model overcomes traditional horizontal-flow grit chamber cannot remove organism on inorganic grit, and the water yield cannot be adapted to fluctuate large defect, enhance the removal ability of the inorganic particle impurity to particle diameter < 200 μm.
Accompanying drawing explanation
Fig. 1 is the plot plan on the utility model one embodiment aeration horizontal-flow grit chamber upper strata;
Fig. 2 is the plot plan of the utility model one embodiment aeration horizontal-flow grit chamber lower floor;
Fig. 3 is the sectional view of the utility model one embodiment aeration horizontal-flow grit chamber;
Fig. 4 is another sectional view of the utility model one embodiment aeration horizontal-flow grit chamber.
Embodiment
Below in conjunction with the drawings and specific embodiments, a kind of aeration horizontal-flow grit chamber that the utility model proposes is described in further detail.According to explanation below and claims, advantage of the present utility model and feature will be clearer.Below by cited embodiment by reference to the accompanying drawings, technology contents of the present utility model and feature will be described in detail.Need to illustrate in addition, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, aid illustration the utility model embodiment lucidly.For sake of convenience, hereinafter described " on ", D score, "left", "right" be consistent with the direction of the upper and lower, left and right of accompanying drawing, but this can not become the restriction of technical solutions of the utility model.
Composition graphs 1 to Fig. 4 illustrates aeration horizontal-flow grit chamber of the present utility model, and it comprises two groups of parallel and single ponds 100 be set up in parallel, and it is identical often to organize scale.Often organize single pond 100 and comprise the inhalant region 10 communicated successively, aerated grit chamber, horizontal-flow grit chamber 40 and exhalant region 50, aerated grit chamber comprises the aeration section 20 and skimming district 30 that communicate, and the sand collecting hopper 28 be positioned at bottom aeration section 20, skimming district 30 is between aeration section 20 and horizontal-flow grit chamber 40, aeration section 20 is provided with into water drowned weir 23' away from the top of first barricade 23 of side, skimming district 30 (being right side in figure), second barricade 24 is set between aeration section 20 and skimming district 30, and the top of the second barricade 24 is provided with water outlet drowned weir 24', and the height of water outlet drowned weir 24' is lower than the height of water inlet drowned weir 23', the water inlet training wall 31 that skimming district 30 is opened wide by bottom is separated with horizontal-flow grit chamber 40, the top of third gear wall 41 relative with water inlet training wall 31 in horizontal-flow grit chamber 40 is provided with effluent weir 41', and, be provided with aerating apparatus in aeration section 20, in skimming district 30, be provided with oil removing skimmer device, in horizontal-flow grit chamber 40, be provided with sand removing device.
Aeration horizontal-flow grit chamber of the present utility model; by the aeration pre-treatment in aerated grit chamber aeration section 20; the organic granular impurity in sewage is made to be in suspended state; sand grains rubs mutually and bears the shearing force of aeration; the organic pollutant that sand grains adheres to is removed; be conducive to isolating comparatively pure inorganic grit; under the centrifugal action of eddy flow; the inorganic grit that density is larger is thrown toward aeration section 20 outside and sinks to sand collecting hopper 28 to discharge outside pond, and the less organism of density is then with flowing into skimming district 30 before current direction.Aeration section 20 realizes oily water separation by air supporting effect, oil slick after oily water separation and scum silica frost are discharged outside pond by skimming district 30 again that be communicated with aeration section 20, solve the problem of the oil removing slagging-off of organic granular impurity in waste water, sewage after skimming district 30 oil removing slagging-off enters horizontal-flow grit chamber 40, fail to continue to be deposited at horizontal-flow grit chamber 40 at the sand grains of aeration section 20 sedimentation, the sand setting quality of horizontal-flow grit chamber 40 is guaranteed, therefore, aeration horizontal-flow grit chamber of the present utility model overcomes traditional horizontal-flow grit chamber cannot remove organism on inorganic grit, and the water yield cannot be adapted to fluctuate large defect, enhance the removal ability of the inorganic particle impurity to particle diameter < 200 μm.
Further, as shown in Figure 3, aeration section 20 comprises the sediment by aeration district 21 and oily water separation district 22 that communicate, the partition wall 25 that bottom opens wide is set between sediment by aeration district 21 and oily water separation district 22, namely oily water separation district 22 is separated with sediment by aeration district 21 by the partition wall 25 stretched in water, and oily water separation district 22 is near skimming district 30.The setting of partition wall 25 makes aeration reflux, and is convenient to sewage and fully mixes with aeration, is more conducive to carry out oxygenolysis to the organism in sewage.
For increasing work efficiency, in the present embodiment, the inhalant region 10 in two groups of list ponds 100 communicates, and the exhalant region 50 in two groups of list ponds 100 also communicates, make the sewage in inhalant region 10 can flow into each single pond 100 respectively and carry out oily water separation and sand removing process using, the sewage after having processed imports exhalant region 50 by each single pond 100 again.
As depicted in figs. 1 and 2, aeration section 20 is for cross section is in pond type that is square or approximating square, namely its long-width ratio is preferably 1:1, during aeration peak flow, in aeration section 20, the aeration residence time should be greater than 2min, especially be good with about 3min, available depth is preferably 3m ~ 4m, and the aeration rate processing every cubic metre of sewage is preferably 0.1m 3~ 0.2m 3air, because the aeration residence time is short, thus decreases the floor space of aeration section 20.Correspondingly, sand collecting hopper 28 is in orthopyramid shape, and the angle of its sidewall and horizontal plane is 55 ° ~ 60 °, is beneficial to sand grains and slips into sand collecting hopper 28 and collect.Further, as shown in Figure 3, the inwall of sand collecting hopper 28 is provided with sand suction pipe 29, and sand suction pipe 29 stretches into bottom sand collecting hopper 28, sand suction pipe 29 is communicated with the external sand pump 80 being arranged at aeration section 20 outside, is discharged the sand setting in sand collecting hopper 28 by sand suction pipe 29 and external sand pump 80.In the present embodiment, transform pond type cross section long and narrow for traditional aeration section 20 as square or approximating square, sand collecting hopper 28 also changes orthopyramid shape into by rectangle, therefore, without the need to arranging sand catcher at pool side and inhaling sand purlin car, only need sand suction pipe 29 be stretched into bottom sand collecting hopper 28, by the directly sediment outflow of the external sand pump 80 outside aeration section 20, not only be more conducive to deposition and the discharge of sand grains, and simplify desanding device, improve economic benefit.
As shown in Figures 2 to 4, above-mentioned sand removing device is inhale sand purlin car 43 and be installed on the sand pump (not shown) of inhaling on sand purlin car 43, inhale sand purlin car 43 to be communicated with the sand catcher 60 of encorbelmenting outside horizontal-flow grit chamber 40, by inhaling moving around of sand purlin car 43 sand setting in horizontal-flow grit chamber 40 bottom sand trap 42 entered sand catcher 60, in horizontal-flow grit chamber 40 during sewage peak flow, its residence time should be not less than 1min, cross-sectional flow is preferably 0.15m/s ~ 0.2m/s, and available depth is preferably 0.8m ~ 1m.Better, aeration horizontal-flow grit chamber also comprises grit water separator 70, grit water separator 70 is communicated with sand suction pipe 29 with sand catcher 60 respectively, the sand grains that sand grains in sand catcher 60 and sand collecting hopper 28 are discharged all enters grit water separator 70 to carry out sand water and is separated, this setup, collecting and processing more concentrated sand grains, reduce energy consumption.
Aerating apparatus in above-mentioned aeration section 20 adopts mechanical aeration and blast aeration, please continue to refer to Fig. 3, in the present embodiment, aerating apparatus comprises aeration tube 26 and aeration pump 27, aeration tube 26 is installed vertically on the sidewall of sediment by aeration district 21 first barricade 23, and aeration tube 26 passes through connected outside roots blower 81 to air feed in sediment by aeration district 21.Arrange aeration pump 27 in oily water separation district 22, aeration pump 27 is made up of submersible pump and ejector, and its composition and annexation are prior art content, repeat no more herein.The setting of aeration pump 27, can make a large amount of oxygen enter oily water separation district 22 with current, is conducive to sewage in oily water separation district 22 and realizes oily water separation by air supporting effect.More excellent, the bottom of aeration tube 26 and aeration pump 27 is all near the bottom of aeration section 20, and the bottom 60cm ~ 90cm of distance aeration section 20.
As shown in Figure 3, aeration horizontal-flow grit chamber is discharged for ease of the oil slick that will produce after oily water separation process and scum silica frost, oil removing skimmer device is also provided with on the top in skimming district 30, preferred electronic oil removing skimmer 32 in the present embodiment, to remove the oil slick and the scum silica frost that fly at top layer, skimming district 30, to ensure the sand setting quality of follow-up horizontal-flow grit chamber 40, certainly, above-mentioned electronic oil removing skimmer 32 is only an example, also can adopt the equipment of other similar functions.
Continue with reference to figure 3, water inlet training wall 31 bottom has one near the kink 31' of the second barricade 24, compare vertical training wall, kink 31' can avoid the oil slick in skimming district 30 and scum silica frost to flow into horizontal-flow grit chamber 40, the axis of kink 31' has an angle α with the axis of water inlet training wall 31, and 20 °≤α≤40 °, in the present embodiment, angle α preferably 30 °, can either stop that oil slick and scum silica frost flow into horizontal-flow grit chamber 40, the current that can not affect in skimming district 30 enter in horizontal-flow grit chamber 40 and continue sand setting again.
Above-mentioned horizontal-flow grit chamber 40 is cross sections is rectangular settling pit, and design current velocity is 0.15m/s ~ 0.3m/s, and hydraulic detention time should be greater than 30 seconds, and sand setting water ratio is 60%, unit weight 1.5t/m 3because aeration section 20 designs the shortening of the residence time, fail at the sand grains of aeration section 20 sedimentation, continuation to be deposited at horizontal-flow grit chamber 40, horizontal-flow grit chamber 40 designs the residence time and is about 1min ~ 2min, because the organism be adsorbed on sand grains is removed in aeration section 20, the sand setting quality of horizontal-flow grit chamber 40 is ensured.
Composition graphs 1 to Fig. 4 illustrates the working process of aeration horizontal-flow grit chamber of the present utility model: sewage is after the preliminary scrubbing of the fine fack in inhalant region 10, enter aeration section 20 through water inlet drowned weir 23' and carry out preaeration, by aeration effect, the organism being attached to inorganic particle contaminant surface is divested, specifically, sewage removes in sediment by aeration district 21 part that in inorganic particle impurity, particle diameter is relatively little, the centrifugal force produced by eddy flow is thrown to pool wall and is sunk to the sand collecting hopper 28 of bottom, subsequently, sewage enters oily water separation district 22, by the operation of aeration pump 27 under water, oil slick scum silica frost is made to be floated to sewage surface through air supporting effect, sewage behind oily water separation district 22 is crossed water outlet drowned weir 24' with submerge discharging flow form and is entered skimming district 30, the oil slick that oily water separation produces and scum silica frost training wall 31 of being intake are blocked in skimming district 30, and discharge outside pond by the electronic oil removing skimmer 32 in skimming district 30, organism is then suspended in sewage and enters follow-up horizontal-flow grit chamber 40 with current, the sand trap 42 that sand grains in sewage sinks to bottom horizontal-flow grit chamber 40 collects, by inhaling sand purlin car 43, the sand setting bottom sand trap 42 is entered sand catcher 60, the sand grains that sand grains in sand catcher 60 and sand collecting hopper 28 are discharged all enters grit water separator 70 to carry out sand water and is separated, sewage after horizontal-flow grit chamber 40 sand setting then enters exhalant region 50 through effluent weir 41', discharge finally by water outlet 51, complete oily water separation and the sand setting process of sewage.
Foregoing description is only the description to the utility model preferred embodiment; any restriction not to the utility model scope; any change that the those of ordinary skill in the utility model field does according to above-mentioned disclosure, modification, all belong to the protection domain of claims.

Claims (10)

1. an aeration horizontal-flow grit chamber, is characterized in that, comprising:
At least one group of parallel and single pond be set up in parallel;
Often organize described single pond comprise communicate successively inhalant region, aerated grit chamber, horizontal-flow grit chamber and exhalant region;
Described aerated grit chamber comprises the aeration section and skimming district that communicate, and the sand collecting hopper be positioned at bottom described aeration section, described skimming district is positioned between described aeration section and described horizontal-flow grit chamber, the top of first barricade away from side, described skimming district of described aeration section is provided with into water drowned weir, between described aeration section and described skimming district, the second barricade is set, and the top of described second barricade is provided with water outlet drowned weir, and the height of described water outlet drowned weir is lower than the height of described water inlet drowned weir, the water inlet training wall that described skimming district is opened wide by bottom and described horizontal-flow grit chamber are separated, the top of third gear wall relative with described water inlet training wall in described horizontal-flow grit chamber is provided with effluent weir, be provided with aerating apparatus in described aeration section, be provided with oil removing skimmer device in described skimming district, in described horizontal-flow grit chamber, be provided with sand removing device.
2. aeration horizontal-flow grit chamber according to claim 1, it is characterized in that: described aeration section comprises the sediment by aeration district and oily water separation district that communicate, arrange the partition wall that bottom opens wide between described sediment by aeration district and described oily water separation district to separate, and described oily water separation district is near described skimming district.
3. aeration horizontal-flow grit chamber according to claim 1 and 2, is characterized in that: when described single pond for organizing more, the inhalant region in described single pond communicates, and the exhalant region in described single pond also communicates.
4. aeration horizontal-flow grit chamber according to claim 1 and 2, is characterized in that: described aeration section cross section is in square, and described sand collecting hopper is orthopyramid shape, and the angle of its sidewall and horizontal plane is 55 ° ~ 60 °.
5. aeration horizontal-flow grit chamber according to claim 4, it is characterized in that: the sidewall of described sand collecting hopper is also provided with sand suction pipe, and described sand suction pipe stretches into the bottom of described sand collecting hopper, and described sand suction pipe is communicated with the external sand pump be arranged at outside described aeration section.
6. aeration horizontal-flow grit chamber according to claim 5, it is characterized in that: described sand removing device comprises the suction sand purlin car be arranged in described horizontal-flow grit chamber and the sand pump be installed on the car of suction sand purlin, and described suction sand purlin car is communicated with the sand catcher of encorbelmenting outside described horizontal-flow grit chamber.
7. aeration horizontal-flow grit chamber according to claim 6, is characterized in that: described aeration horizontal-flow grit chamber also comprises grit water separator, and described grit water separator is communicated with described sand suction pipe with described sand catcher respectively.
8. aeration horizontal-flow grit chamber according to claim 1 and 2, it is characterized in that: described aerating apparatus comprises aeration tube and aeration pump, described aeration tube is installed on the sidewall of the first barricade in described sediment by aeration district, and described aeration tube is connected with blower fan, in described oily water separation district, described aeration pump is set.
9. aeration horizontal-flow grit chamber according to claim 1 and 2, it is characterized in that: the bottom of described water inlet training wall has one near the kink of described second barricade, the axis of described kink and the axis of described water inlet training wall have an angle α, and 20 °≤α≤40 °.
10. aeration horizontal-flow grit chamber according to claim 9, is characterized in that: described angle α is 30 °.
CN201420597538.0U 2014-10-16 2014-10-16 A kind of aeration horizontal-flow grit chamber Active CN204138447U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105396334A (en) * 2015-12-07 2016-03-16 宋德安 A staged aerated grit washing and removing device used for an aerated grit chamber
CN105502548A (en) * 2015-12-07 2016-04-20 宋德安 Aerated grit chamber with fixed tail end for grit discharge
CN105692737A (en) * 2016-04-21 2016-06-22 上海市城市建设设计研究总院 Aerated grit chamber with integrated functions of grit removing, skimming and oil removing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105396334A (en) * 2015-12-07 2016-03-16 宋德安 A staged aerated grit washing and removing device used for an aerated grit chamber
CN105502548A (en) * 2015-12-07 2016-04-20 宋德安 Aerated grit chamber with fixed tail end for grit discharge
CN105396334B (en) * 2015-12-07 2017-06-16 宋德安 A kind of washed-out sand desanding device of aeration stage by stage for aerated grit chamber
CN105692737A (en) * 2016-04-21 2016-06-22 上海市城市建设设计研究总院 Aerated grit chamber with integrated functions of grit removing, skimming and oil removing

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