CN210974183U - Dredging residual water treatment device - Google Patents
Dredging residual water treatment device Download PDFInfo
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- CN210974183U CN210974183U CN201921361039.0U CN201921361039U CN210974183U CN 210974183 U CN210974183 U CN 210974183U CN 201921361039 U CN201921361039 U CN 201921361039U CN 210974183 U CN210974183 U CN 210974183U
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Abstract
The utility model discloses a dredge surplus water treatment facilities, include: the inner cylinder is sequentially divided into a crystallization product concentration area, a crystallization area and a coagulation area from bottom to top; the outer cylinder is sleeved outside the inner cylinder, the top of the outer cylinder is provided with an overflow port, and the inner cylinder is sequentially divided into a sludge settling area and a solid-liquid separation area from bottom to top; the solid-liquid separation zone is positioned above the inner cylinder and is directly communicated with the coagulation zone, and the sludge concentration zone is positioned between the inner cylinder and the outer cylinder; the bottom of the crystallization area is provided with a water inlet and a magnesium salt inletAnd an alkali liquor inlet, wherein a stirring mechanism is arranged in the alkali liquor inlet, and an alkali liquor dosing pipe is arranged at the junction of the coagulation area and the crystallization area. The utility model discloses can realize dredging that suspended solid and nitrogen phosphorus in the residual water get rid of in step, and retrieve the device and the method of high integration, the easy automated control of part nitrogen phosphorus among them to NH3The removing effect of the-N and the P is stable, the occupied area is small, and the method is particularly suitable for treating the dredged residual water.
Description
Technical Field
The utility model belongs to the technical field of the surplus water treatment of dredging, especially, relate to a surplus water treatment facilities dredges.
Background
Environmental protection dredging is a main engineering measure for controlling water eutrophication and treating black and odorous water. The water content of dredged muddy water generated in the environment-friendly dredging process is up to more than 95 percent, and a large amount of dredged residual water is generated after solid-liquid separation. In a polluted bottom sediment dredging and pumping unit, pollutants existing in the solid phase of the bottom sediment are diffused into water on a large scale, so that the dredged residual water is always high in suspended matter concentration (SS) and ammonia Nitrogen (NH)3N) and high phosphorus (P), SS, NH in the dredged water, in the case of typical engineering, even by natural sedimentation of the dredged sediment stockyard3Average values of N and P are respectively as high as 1000 mg/L, 5 mg/L and 2 mg/L, if the sewage is directly discharged to a dredged water body, serious secondary pollution is generated, and for this reason, the dredged residual water needs to be correspondingly treated so as to meet the direct discharge standard.
At present, the common technical scheme for treating the dredged residual water is coagulation and chemical addition sedimentation promotion. A large amount of aluminum-series and iron-series coagulants are put into the dredging residual water to realize the destabilization and flocculation of suspended matters, then the suspended matters are removed after precipitation separation in the form of flocs, and the N and P in corresponding adsorption states or particle states are also removed. Meanwhile, the hydrolysate of the coagulant has strong adsorption performance on P, so that the P removal efficiency is very high, and the direct discharge standard can be ensured. But because of the high stability of suspended substances in the dredging residual water, the SS removing effect is limited after the addition of the chemical and the sedimentation promotion, and the soluble NH3N is hardly removed. The dosing and sedimentation promoting technology cannot realize the resource utilization of N and P in the dredging residual water.
The Chinese invention patent (CN104016546A) discloses an environment-friendly dredging residual water purification artificial wetland system, which can realize the efficient removal of suspended matters, N and P, but cannot realize the resource utilization of the pollution, the Chinese utility model patent (CN2017215042631) discloses an environment-friendly dredging tail water treatment device based on a membrane integration technology, the treatment effect is good, but the resource utilization of the suspended matters, the N and the P cannot be realized, the Chinese invention patent (CN101602535B) introduces a phosphorus recovery crystallization reactor and a phosphorus recovery method, the method adopts an ammoniomagnesium phosphate livestock and poultry crystallization method to recover the N and the P in sewage, but is mainly suitable for high-concentration nitrogen and phosphorus wastewater such as wastewater, the Chinese invention patent (CN104310641A) discloses a low-phosphorus removal method, the method adopts modified coral sand as seed crystal, through primary fluidized bed crystallization and secondary fixed bed crystallization, the phosphorus concentration in secondary effluent of a sewage plant can be reduced from 0.6-2.4 mg/L to below 0.2 mg/L, meanwhile, the residual phosphorus in the sewage is obtained in a form of a water depth recovery reaction time which is obviously longer than that the HAP is needed in the HAP recovery method.
In summary, no effective technical method for treating the dredging residual water, which can meet the relevant discharge standard and can effectively recover the N and the P in the dredging residual water, has been reported so far.
SUMMERY OF THE UTILITY MODEL
The present application is directed to solving at least one of the problems in the prior art. Therefore, an object of the present invention is to provide a dredging residual water treatment device capable of synchronously removing suspended matters and nitrogen and phosphorus in the dredging residual water and realizing nitrogen and phosphorus recovery.
In order to solve the technical problem, the following technical scheme is adopted in the application:
a dredging remainder water treatment apparatus comprising:
the inner cylinder is sequentially divided into a crystallization product concentration area, a crystallization area and a coagulation area from bottom to top;
the outer cylinder is sleeved outside the inner cylinder, the top of the outer cylinder is provided with an overflow port, and the inner cylinder is sequentially divided into a sludge settling area and a solid-liquid separation area from bottom to top;
the solid-liquid separation zone is positioned above the inner cylinder and is directly communicated with the coagulation zone, and the sludge concentration zone is positioned between the inner cylinder and the outer cylinder;
the bottom of the crystallization area is provided with a water inlet, a magnesium salt inlet and an alkali liquor inlet, the inner part of the crystallization area is provided with a stirring mechanism, and the junction of the coagulation area and the crystallization area is provided with an alkali liquor dosing pipe.
Furthermore, a pH adjusting area is further arranged above the coagulation area in the outer barrel, and an acid liquor dosing pipe is arranged at the junction of the pH adjusting area and the coagulation area.
Furthermore, the acid liquor dosing pipe is spirally distributed in the outer cylinder in a plane.
Furthermore, the crystallization product concentration area is in an inverted cone shape, and the bottom of the crystallization product concentration area is provided with a slag discharge pipe extending to the outside of the outer cylinder.
Furthermore, a stirring mechanism is arranged in the coagulation area.
Furthermore, the water inlet, the magnesium salt inlet and the alkali liquor inlet share the same inlet, and a pipeline mixer is arranged on the inlet.
Furthermore, the alkali liquor dosing pipe is distributed in the inner cylinder in a plane spiral shape.
Furthermore, the bottom of the sludge settling area is in an inverted cone shape to form a sludge concentration area.
Furthermore, a sludge discharge pipe is arranged at the bottom of the sludge concentration area.
Compared with the prior art, the utility model discloses the beneficial effect who has lies in:
1. realizes the suspended substances and NH in the dredging residual water3-synchronous removal of N and P. Wherein the forced agglomeration crystallization process can remove part of suspended substances and NH3-N and PO4 3-The flocculation and sedimentation concentration process of the form of P and magnesium salt can remove residual suspended substances and non-PO4 3-Form P.
2. Low concentration of dredging residual waterDegree NH3And resource utilization is realized by-N and P. The utility model discloses in through force stirring and the induced agglomeration crystallization of forcing of high concentration silt, show to reduce the required activation energy of crystallization reaction for the reaction can be gone on under lower supersaturation, the NH of low concentration promptly3The generation of MAP with destabilized sediment particles as cores under the conditions of-N and P effectively overcomes the defect that MAP crystallization can only be carried out at high concentration of NH3The technical difficulties which can only occur under N and P conditions.
3、NH3The removal effect of-N and P is stable. The utility model discloses well make full use of dredges the silt particle of surplus aquatic, regards it as the inducer, need not to throw the inducer outward and can maintain the high particulate matter number density of crystallization system, ensures going on smoothly of forced agglomeration crystallization, NH3The removal effect of-N and P is stable.
4. The system has simple structure and high integration, and is convenient for realizing automatic control. The device adopts a fluidized bed structure type, integrates the functions of forced agglomeration crystallization, magnesium salt coagulation, solid-liquid separation, precipitation, sludge concentration and the like, and is convenient for realizing automatic control.
5. The device has the characteristics of small floor area, vehicle-mounted movement and short running period, and is particularly suitable for dredging residual water. The total hydraulic retention time of the whole treatment device is controlled to be about 15min, the system has small occupied area, vehicle-mounted movement can be realized, and permanent structures do not need to be built.
To sum up, the utility model discloses a can realize dredging that suspended solid and nitrogen phosphorus in the residual water get rid of in step, and retrieve the device and the method of high integration, the easy automated control of part nitrogen phosphorus among them to NH3the-N and P removal effect is stable, the floor area is small, the vehicle-mounted mobile device can be moved on a vehicle, and the device is particularly suitable for the treatment of the dredged residual water.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the device for treating the dredging residual water adopts a fluidized bed structure type and is divided into an inner cylinder 1 and an outer cylinder 2 sleeved outside the inner cylinder 1, wherein the bottom of the outer cylinder 2 is supported by supporting legs 3, the top of the outer cylinder is provided with a stirrer 4, and the inner cylinder 1 is connected and fixed in the outer cylinder 2 by a connecting piece 5.
In this embodiment, the inner cylinder 1 is divided into a crystallization product concentration region 101, a crystallization region 102 and a coagulation region 103 from bottom to top, and an alkali liquor dosing pipe 6 is arranged at the junction of the crystallization region 102 and the coagulation region 103. The wall of the alkali liquor dosing tube 6 is evenly provided with alkali liquor dosing holes. The outer cylinder 2 is divided into a pH adjusting zone 201, a solid-liquid separation zone 202, a sludge settling zone 203 and a sludge concentration zone 204 from top to bottom. Wherein, the bottom of the solid-liquid separation zone 202 is directly communicated with the top of the coagulation zone 103, and an acid liquor dosing pipe 7 is arranged at the junction of the pH adjusting zone 201 and the solid-liquid separation zone 202. Acid liquor feeding holes are uniformly distributed on the pipe wall of the acid liquor feeding pipe 7.
Referring to fig. 1, the stirring shaft of the stirring machine 4 extends vertically downwards from the top of the inner barrel 1 to the crystallization area 102 of the inner barrel 1, and stirring paddles are arranged on the stirring shafts of the crystallization area 102 and the coagulation area 103, and are divided into an upper stirring paddle 401 for stirring the coagulation area 103 and a lower stirring paddle 402 for stirring the crystallization area 102. The concrete structure of the stirrer is the existing structure, and is not described herein again.
It is contemplated that in one embodiment, the crystallized product concentrating region 101 is in an inverted cone shape, and the bottom of the crystallized product concentrating region is provided with a slag discharging pipe 8 extending out of the outer cylinder, the sludge concentrating region 204 is also in an inverted cone shape, and the bottom of the inverted cone-shaped sludge concentrating region 204 is provided with a sludge discharging pipe 9.
In practical application, in order to improve the uniformity of dosing, the alkali liquor dosing pipe 6 and the acid liquor dosing pipe 7 are respectively distributed in a plane spiral shape in the inner cylinder and the outer cylinder.
Referring to fig. 1, a water inlet, a magnesium salt inlet and an alkali liquor inlet are arranged at the bottom of the crystallization area 102, and dredged residual water, magnesium salt and alkali liquor are respectively introduced into the crystallization area from the water inlet, the magnesium salt inlet and the alkali liquor inlet. Specifically, in this embodiment, the water inlet, the magnesium salt inlet and the alkali liquor inlet share the same inlet, the pipeline mixer 12 is disposed on the inlet, and the dredged residual water, the magnesium salt and the alkali liquor are fully mixed in the pipeline mixer 12 and then enter the crystallization area 102. The dredged residual water, the magnesium salt and the alkali liquor are fully mixed in the pipeline mixer in advance, so that the subsequent clustering reaction is facilitated.
The residual water treatment process of the dredging residual water treatment device is as follows: dredging residual water and MgCl2After the solution and NaOH solution were mixed in the line mixer 12, the pH was adjusted to 9.5 and the low concentration PO was added4 3-、NH3-N and Mg2+MAP molecular cluster is generated rapidly, and the double electric layers of the silt particles are Mg2+Is compressed under the action of the pressure, becomes destabilized particles and then enters the crystallization area 102 from the bottom of the crystallization area 102 provided with a water inlet. Under the action of the lower stirring paddle 402 in the crystallization zone 102, MAP molecular agglomeration and high-particle number density destabilizing sand grains are agglomerated and crystallized (Beck R, Andreassen J P. subepitricity Growth of calcium carbonate. Crystal Growth)&Design,2010,10: 2935-2947) to produce a crystalline product MAP with destabilized silt particles as core. As the crystallization process continues, the product particles gradually increase in size and settle into the crystallized product concentration zone 103. The crystallized product MAP is concentrated and then discharged from a slag discharge pipe 8.
Under the action of the ascending water flow, residual Mg in the water2+And destabilized silt particles enter the coagulation zone 103. The pH value of the dredged residual water is adjusted to 11 by NaOH solution from the alkali liquor feeding pipe 6. Under the stirring action of the upper stirring paddle 401, Mg2+Fully hydrolyzed into Mg (OH)2The floc plays roles of adsorption and net capture and sweeping, and destabilized silt particles are coagulated into sludge floc. The sludge floc is subjected to solid-liquid separation with the dredged residual water in the solid-liquid separation zone 202 due to the reduction of the ascending flow velocity, the formed supernatant is mixed with the HCl solution from the acid liquor dosing pipe 7, the pH value is adjusted to 8.5 in the pH value adjusting zone 201, and then the mixture enters the water collecting tank 10 and is discharged out of the water discharging pipe 11 after reaching the standard. The sludge flocs are deposited in the sludge settling zone 203 and then in the sludge concentration zone 204, gravity concentration, and discharging the concentrated sludge through a sludge discharge pipe 9.
Compare current treatment facility, this application has following advantage:
1. realizes the suspended substances and NH in the dredging residual water3-synchronous removal of N and P. Wherein the forced agglomeration crystallization process can remove part of suspended substances and NH3-N and PO4 3-The flocculation and sedimentation concentration process of the form of P and magnesium salt can remove residual suspended substances and non-PO4 3-Form P.
2. For low concentration NH in the dredged residual water3And resource utilization is realized by-N and P. The utility model discloses in through force stirring and the induced agglomeration crystallization of forcing of high concentration silt, show to reduce the required activation energy of crystallization reaction for the reaction can be gone on under lower supersaturation, the NH of low concentration promptly3The generation of MAP with destabilized sediment particles as cores under the conditions of-N and P effectively overcomes the defect that MAP crystallization can only be carried out at high concentration of NH3The technical difficulties which can only occur under N and P conditions.
3、NH3The removal effect of-N and P is stable. The utility model discloses well make full use of dredges the silt particle of surplus aquatic, regards it as the inducer, need not to throw the inducer outward and can maintain the high particulate matter number density of crystallization system, ensures going on smoothly of forced agglomeration crystallization, NH3The removal effect of-N and P is stable.
4. The system has simple structure and high integration, and is convenient for realizing automatic control. The device adopts a fluidized bed structure type, integrates the functions of forced agglomeration crystallization, magnesium salt coagulation, solid-liquid separation, precipitation, sludge concentration and the like, and is convenient for realizing automatic control.
5. The device has the characteristics of small floor area, vehicle-mounted movement and short running period, and is particularly suitable for dredging residual water. The total hydraulic retention time of the whole treatment device is controlled to be about 15min, the system has small occupied area, vehicle-mounted movement can be realized, and permanent structures do not need to be built.
The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.
Claims (9)
1. A dredged residual water treatment apparatus, comprising:
the inner cylinder is sequentially divided into a crystallization product concentration area, a crystallization area and a coagulation area from bottom to top;
the outer cylinder is sleeved outside the inner cylinder, the top of the outer cylinder is provided with an overflow port, and the inner cylinder is sequentially divided into a sludge settling area and a solid-liquid separation area from bottom to top;
the solid-liquid separation zone is positioned above the inner cylinder and is directly communicated with the coagulation zone, and the sludge settling zone is positioned between the inner cylinder and the outer cylinder;
the bottom of the crystallization area is provided with a water inlet, a magnesium salt inlet and an alkali liquor inlet, the inner part of the crystallization area is provided with a stirring mechanism, and the junction of the coagulation area and the crystallization area is provided with an alkali liquor dosing pipe.
2. A dredging residual water treatment apparatus according to claim 1, characterized in that: and a pH adjusting area is also arranged above the coagulating area in the outer barrel, and an acid liquor dosing pipe is arranged at the junction of the pH adjusting area and the coagulating area.
3. A dredging residual water treatment apparatus according to claim 2, characterized in that: the acid liquor dosing pipe is spirally distributed in the outer barrel in a plane.
4. A dredging residual water treatment apparatus according to claim 1, characterized in that: the crystallization product concentration zone is in an inverted cone shape, and the bottom of the crystallization product concentration zone is provided with a slag discharge pipe extending to the outside of the outer cylinder.
5. A dredging residual water treatment apparatus according to claim 1, characterized in that: and a stirring mechanism is arranged in the coagulation area.
6. A dredging residual water treatment apparatus according to claim 1, characterized in that: the water inlet, the magnesium salt inlet and the alkali liquor inlet share the same inlet, and a pipeline mixer is arranged on the inlet.
7. A dredging residual water treatment apparatus according to claim 1, characterized in that: the alkali liquor dosing pipe is distributed in the inner barrel in a plane spiral shape.
8. A dredging residual water treatment apparatus according to claim 1, characterized in that: the bottom of the sludge settling area is in an inverted cone shape, and a sludge concentration area is formed.
9. A dredging residual water treatment apparatus according to claim 8, characterized in that: and a sludge discharge pipe is arranged at the bottom of the sludge concentration area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921361039.0U CN210974183U (en) | 2019-08-21 | 2019-08-21 | Dredging residual water treatment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921361039.0U CN210974183U (en) | 2019-08-21 | 2019-08-21 | Dredging residual water treatment device |
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| CN210974183U true CN210974183U (en) | 2020-07-10 |
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| CN201921361039.0U Active CN210974183U (en) | 2019-08-21 | 2019-08-21 | Dredging residual water treatment device |
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