CN211419883U - Hazardous waste landfill effluent disposal system - Google Patents
Hazardous waste landfill effluent disposal system Download PDFInfo
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- CN211419883U CN211419883U CN201922097321.9U CN201922097321U CN211419883U CN 211419883 U CN211419883 U CN 211419883U CN 201922097321 U CN201922097321 U CN 201922097321U CN 211419883 U CN211419883 U CN 211419883U
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Abstract
The utility model discloses a hazardous waste landfill wastewater treatment system, which comprises a pretreatment system, a membrane concentration system and an evaporation crystallization system which are sequentially connected with a wastewater adjusting tank, wherein the pretreatment system is provided with a dissolved air floatation system, a reduction neutralization reaction system, a sodium carbonate softening reaction tank and a coagulating sedimentation system which are sequentially connected; the membrane concentration system is provided with a multistage filtering device connected with a sewage outlet of the coagulating sedimentation system and a disc tube type reverse osmosis device connected with the multistage filtering device; fresh water of the disc-tube type reverse osmosis device and fresh water of the concentrated water tank are communicated to a next-level sewage treatment plant for water treatment; mother liquor separated by an MVR evaporator and a solid-liquid separator of the evaporative crystallization system is dried by spray drying equipment, and dried solid waste is sent to qualified units for independent treatment. The wastewater treatment system and the method can ensure that the wastewater of the hazardous waste landfill is treated efficiently and stably, and simultaneously reduce the impact of the hazardous waste landfill on the next-level sewage treatment plant.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment systems and methods, in particular to a hazardous waste landfill wastewater treatment system.
Background
The hazardous waste landfill wastewater mainly comes from the washing of transport vehicles and containers, the washing of temporary storage depots, the drainage of materialized workshops, the field washing, landfill leachate, initial rainwater and the like, and the main pollutants comprise chemical oxygen demand, suspended matters, total soluble solids, petroleum and pollutants specified in the Integrated wastewater discharge Standard (GB 8978-. The hazardous waste disposal center is positioned by the function of the hazardous waste disposal center, the received material components are complex, and the hazardous waste landfill wastewater has the characteristics of high total soluble solid concentration, high hardness, large fluctuation of water quality and water quantity, complex pollutant components, toxic and harmful substances, heavy metals and the like.
The hazardous waste landfill usually adopts the treatment process of air floatation, oxidation reduction, neutralization, flocculation precipitation and filtration, the effluent reaches the requirement of the third-level discharge standard in the Integrated wastewater discharge Standard (GB 8978-. In the process of actual operation, because the water quality fluctuation of the hazardous waste landfill is large, particularly the fluctuation of the concentration of total soluble solids is high, the hardness is high, the fluctuation of water quality and water quantity is large, the pollutant components are complex, and the concentration of toxic and harmful substances, heavy metals and the like is large, the impact on the next-stage sewage treatment plant is large, the operation efficiency is influenced, and even the next-stage sewage treatment plant is paralyzed and cannot operate in severe cases.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of above-mentioned prior art, the utility model provides a one set of treatment effect is good, the operation is stable to realized should adopt materialization preliminary treatment + advanced treatment technology to hazardous waste landfill waste water to handle, reduce the pollutant in the waste water, especially total solubility solid, heavy metal and poisonous and harmful substance's concentration, when guaranteeing high-efficient, stable processing hazardous waste landfill waste water, alleviateed a hazardous waste landfill waste water treatment system and waste water treatment method of landfill sewage to next-level sewage treatment plant's impact.
The utility model adopts the technical proposal that: the utility model provides a hazardous waste landfill effluent disposal system, includes the pretreatment systems, the concentrated system of membrane and the evaporative crystallization system that connect gradually on the waste water equalizing basin, wherein:
the pretreatment system is provided with a dissolved air flotation system, a reduction neutralization reaction system, a sodium carbonate softening reaction tank and a coagulating sedimentation system which are connected in sequence, wherein the reduction neutralization reaction system comprises a hydrochloric acid reaction tank, a reduction reaction tank and a neutralization reaction tank which are connected into a whole;
the membrane concentration system is provided with a multistage filtering device connected with a sewage outlet of the coagulating sedimentation system and a disc tube type reverse osmosis device connected with the multistage filtering device;
the dish-tube type reverse osmosis device is provided with a concentrated water outlet and a fresh water outlet, the concentrated water outlet is connected with a concentrated water tank, and the fresh water outlet is communicated to a next-stage sewage treatment plant for water treatment;
a concentrated water outlet of the concentrated water tank is connected with an evaporative crystallization system so as to lead the separated fresh water to a next-level sewage treatment plant for water treatment;
the evaporative crystallization system comprises an MVR evaporator and a solid-liquid separator which are sequentially connected, mother liquor separated by the MVR evaporator and the solid-liquid separator is dried by spray drying equipment, and dried solid waste is sent to qualified units for independent treatment.
Furthermore, the multistage filtering device of the membrane concentration system comprises a multi-medium filter, an activated carbon filter and a cartridge filter which are connected in sequence.
Furthermore, a multistage filtering device of the membrane concentration system is pressurized by a high-pressure pump and then is conveyed into the disc-tube type reverse osmosis device.
Furthermore, a sludge outlet of a coagulating sedimentation system of the pretreatment system is connected with a sludge treatment system, the sludge treatment system comprises a sludge concentration tank and a plate-and-frame filter press which are sequentially connected with a sludge outlet of the coagulating sedimentation system, filtrate of the plate-and-frame filter press is returned to a wastewater adjusting tank for circular treatment, and sludge of the plate-and-frame filter press is subjected to centralized external treatment.
Furthermore, the dissolved air flotation system, the reduction neutralization reaction system, the sodium carbonate softening reaction tank and the coagulating sedimentation system of the pretreatment system are all provided with dosing devices, the dosing devices are respectively connected with the dissolved air flotation system, the reduction neutralization reaction system, the sodium carbonate softening reaction tank and the coagulating sedimentation system which correspond to the dosing devices, and are used for adding corresponding medicaments to each reaction system, and each dosing device is connected with the PLC control device.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the dangerous waste landfill wastewater treatment system carries out pretreatment, multi-stage filtration membrane concentration treatment, sludge separation and evaporative crystallization treatment on dangerous waste landfill wastewater containing toxic and harmful substances, heavy metals and the like, which is high in total soluble solid concentration, high in hardness, large in water quality and water quantity fluctuation, complex in pollutant components and contains toxic and harmful substances, heavy metals and the like in a dangerous waste landfill in advance, so as to realize preliminary decomposition of sewage and separation treatment of dangerous solid wastes, and reduce impact of the landfill sewage on a next-stage sewage treatment plant.
2. The utility model discloses a hazardous waste landfill effluent disposal system adopts disc tube formula reverse osmosis ware, compares with traditional formula reverse osmosis technology of book, requires lowly to the preliminary treatment, and the operation is stable, and the rate of recovery is high (disc tube formula reverse osmosis rate of recovery can reach 50-75%, and traditional reverse osmosis rate of recovery is generally only 45-50%), has reduced follow-up evaporation crystal system throughput, reduces the working costs.
3. The utility model discloses a hazardous waste landfill effluent disposal system discharges a small amount of mother liquor to realize controlling the effect of the medium and high boiling point material concentration of mother liquor, and then reach the mesh that control mother liquor boiling point rose. In addition, the evaporative crystallization system is provided with spray drying equipment to process a small amount of mother liquor discharged by the evaporative crystallization system so as to realize solid-liquid separation, and the separated solid waste is sent to a qualified unit for separate treatment, so that the purposes of full utilization and recovery are achieved, and the environment is not polluted.
Drawings
FIG. 1 is a block diagram of one embodiment of a hazardous waste landfill wastewater treatment system;
FIG. 2 is a block diagram of another embodiment of a hazardous waste landfill wastewater treatment system;
FIG. 3 is a functional block diagram of one embodiment of a pre-processing system;
wherein: 1-a wastewater adjusting tank, 2-a pretreatment system, 21-a dissolved air floatation system, 22-a reduction neutralization reaction system, 23-a sodium carbonate softening reaction tank, 24-a coagulating sedimentation system and 25-a dosing device; 3-membrane concentration system, 31-multi-media filter, 32-activated carbon filter, 33-cartridge filter, 34-disc-tube type reverse osmosis device, 35-high pressure pump; 4-a concentrated water tank, 5-an evaporative crystallization system, 51-an MVR evaporator, 52-a solid-liquid separator and 53-spray drying equipment; 6-sludge treatment system, 61-sludge concentration tank and 62-plate and frame filter press.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1, a hazardous waste landfill wastewater treatment system comprises a pretreatment system 2, a membrane concentration system 3 and an evaporative crystallization system 4 which are connected to a wastewater adjusting tank 1 in sequence, wherein:
the pretreatment system 2 is provided with a dissolved air flotation system 21, a reduction neutralization reaction system 22, a sodium carbonate softening reaction tank 23 and a coagulating sedimentation system 24 which are connected in sequence, wherein the reduction neutralization reaction system 22 comprises a hydrochloric acid reaction tank, a reduction reaction tank and a neutralization reaction tank which are connected into a whole;
the membrane concentration system 3 is provided with a multi-stage filtration device connected with the sewage outlet of the coagulating sedimentation system 24 and a disc-tube type reverse osmosis device 34 connected with the multi-stage filtration device;
the disc tube type reverse osmosis device 34 is provided with a concentrated water outlet and a fresh water outlet, the concentrated water outlet is connected with the concentrated water tank 4, and the fresh water outlet is communicated to a next-stage sewage treatment plant for water treatment;
a concentrated water outlet of the concentrated water tank 4 is connected with an evaporative crystallization system 5 so as to lead the separated fresh water to a next-level sewage treatment plant for water treatment;
the evaporative crystallization system 5 comprises an MVR evaporator 51 and a solid-liquid separator 52 which are connected in sequence, mother liquor separated by the MVR evaporator 51 and the solid-liquid separator 52 is dried by spray drying equipment 53, and dried solid waste is sent to qualified units for individual treatment. Enrichment (such as nitrate, calcium chloride, organic matter etc.) of high boiling point material can lead to the system boiling point constantly to rise in the MVR evaporimeter, and then influences evaporation efficiency, so at MVR evaporimeter operation in-process, can discharge a small amount of mother liquor, through the high boiling point material concentration in the control mother liquor to ensure that its boiling point risees in certain extent. This scheme design adopts spray drying treatment facility to handle MVR evaporimeter discharge mother liquor. The mother liquor is treated by spray drying treatment equipment to form solids, and the solids separated by the solid-liquid separator are sent to a qualification unit for treatment, so that the treatment pressure of a next-level sewage treatment plant is reduced.
The utility model discloses a waste water treatment system, the multistage filter equipment of membrane concentration system 3 is including the multimedium filter 31, activated carbon filter 32, the safety filter 33 that connect gradually, and the benefit that this system used is: firstly, a multi-medium filter is used for ensuring that water with higher turbidity passes through granular or non-granular materials with certain thickness under certain pressure, so that suspended impurities are effectively removed and the water is clarified, commonly used filter materials comprise quartz sand, anthracite, manganese sand and the like, and the multi-medium filter is mainly used for removing turbidity of water treatment, softening water, pre-stage pretreatment of pure water and the like, and the turbidity of the effluent can reach below 3 ℃; then, the water treated by the multi-medium filter is subjected to the active carbon filter to adsorb residual chlorine which cannot be removed in the previous stage of filtration so as to prevent a reverse osmosis membrane at the later stage from being oxidized and degraded, and simultaneously adsorb pollutant substances such as micromolecular organic matters leaked from the previous stage, so that the water has obvious adsorption and removal effects on peculiar smell, colloid, pigment, heavy metal ions and the like in the water and also has the effect of reducing COD; and finally, the device is used for realizing solid-liquid separation of various suspensions after the previous two times of filtration, efficiently removing water, oil mist and solid particles, and realizing purification of sewage.
The utility model discloses a wastewater treatment system, the multistage filter equipment of membrane concentration system 3 passes through and carries entering disc tubular reverse osmosis unit 34 after the pressure boost of high-pressure pump 35, the sewage play water SDI mud siltation index after the multistage filter equipment filters is less than 20, get into disc tubular reverse osmosis system after the high-pressure pump pressure boost, sewage separates through disc tubular reverse osmosis unit, divide into fresh water and dense water two parts wherein fresh water account for 75% of total water volume, dense water accounts for 25% of total water volume, the rate of recovery is 75% promptly, fresh water reaches tertiary emission standard requirement in "comprehensive discharge standard of sewage" GB 8978-.
The utility model discloses a wastewater treatment system, can see from fig. 2, sludge treatment system 6 is even in the sludge outlet of the coagulating sedimentation system 24 of pretreatment systems 2, sludge treatment system 6 is including connecting gradually sludge thickening tank 61 and the filter press 62 in the sludge outlet of coagulating sedimentation system 24, the filtrating of filter press 62 returns to waste water equalizing basin 1 circulation and handles, the processing is put to the mud of filter press 62 is concentrated outward, also concentrate the independent processing, perhaps transport to special waste residue treatment unit and handle, realize the isolated processing alone, so that retrieve and prevent pollution.
As can be seen from fig. 3, the dissolved air flotation system 21, the reduction neutralization reaction system 22, the sodium carbonate softening reaction tank 23 and the coagulating sedimentation system 24 of the pretreatment system 2 are all provided with a dosing device 25, the dosing devices are respectively connected with the dissolved air flotation system 21, the reduction neutralization reaction system 22, the sodium carbonate softening reaction tank 23 and the coagulating sedimentation system 24 corresponding thereto, so as to add corresponding agents to the reaction systems, and each dosing device 25 is connected with a PLC control device, so as to uniformly control the content of the agents to be added to each system, thereby realizing centralized control dosing.
The utility model discloses a method that effluent disposal system used when carrying out waste water treatment is, dangerous waste landfill waste water gets into the waste water equalizing basin through collecting, then promote through the pump and get into dissolved air flotation system, dissolved air flotation system 21 is carrying out the during operation, after adding the coagulant and making tiny pollutant in the waste water congeal and gather together the abundant contact in dissolving air flotation system, adsorb in the suspended solid that the flocculation is good at the in-process that slowly rises afterwards, tiny pollutant density descends and floats to the surface of water in making the waste water, reach the purpose of getting rid of SS and CODcr.
After the effluent of the dissolved air floatation device of the wastewater treatment system of the utility model flows into the reduction neutralization reaction system, the reduction neutralization reaction system 22 works, firstly, the pH value is controlled, hydrochloric acid is added into the hydrochloric acid reaction tank, and the pH = 2-3 of the wastewater is controlled;
then, accelerating the reduction reaction, adding a reducing agent into the reduction reaction tank for reducing the oxidative pollutants in the wastewater, controlling the reduction reaction to be 25-35min, preferably 30min, and meanwhile, arranging a stirring device in the reduction reaction tank to fully mix the wastewater and the medicament so as to improve the efficiency of the reduction reaction;
and finally, carrying out acid-base neutralization reaction, adding liquid alkali into a neutralization reaction tank, controlling the pH to be = 11-12, reacting magnesium ions in the wastewater with hydroxide radicals to produce magnesium hydroxide precipitate, controlling the acid-base neutralization reaction time to be 40-50min, preferably 45min, and similarly, arranging a stirrer in the neutralization reaction tank to fully mix the wastewater with the medicament, thereby improving the mass transfer efficiency.
The utility model discloses a waste water treatment system also sets up the mixer in the sodium carbonate softens the reaction tank 23, and the calcium ion reaction in sodium carbonate and the waste water produces calcium carbonate and deposits to reaction time after adding the sodium carbonate in the sodium carbonate softens reaction tank 23 is 45min, makes waste water and medicament intensive mixing, improves mass transfer efficiency.
In the wastewater treatment system of the utility model, the coagulating sedimentation system 24 is provided with a coagulating area and a settling area, a coagulant and a flocculant are respectively added into the coagulating area, then solid-liquid separation is carried out in the settling area, the supernatant fluid of the settling area enters a water collecting tank for temporary storage, and the sludge generated in the settling area enters a sludge treatment system for treatment; the reaction time of the coagulation zone is 15 min; the reaction time of the flocculation zone is 30min, the sedimentation time of the sedimentation zone is 6h, and sludge generated by sedimentation enters a sludge treatment system for treatment.
The embodiment of the present invention discloses a preferred embodiment, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention according to the above embodiment, and make different extensions and changes, but do not depart from the spirit of the present invention, all of which are within the protection scope of the present invention.
Claims (5)
1. The utility model provides a hazardous waste landfill effluent disposal system which characterized in that: including connect gradually pretreatment systems (2), membrane concentration system (3) and evaporation crystallization system (4) on waste water equalizing basin (1), wherein:
the pretreatment system (2) is provided with a dissolved air flotation system (21), a reduction neutralization reaction system (22), a sodium carbonate softening reaction tank (23) and a coagulating sedimentation system (24) which are sequentially connected, wherein the reduction neutralization reaction system (22) comprises a hydrochloric acid reaction tank, a reduction reaction tank and a neutralization reaction tank which are integrally connected;
the membrane concentration system (3) is provided with a multi-stage filtration device connected with a sewage outlet of the coagulating sedimentation system (24) and a disc-tube type reverse osmosis device (34) connected with the multi-stage filtration device;
the disc tube type reverse osmosis device (34) is provided with a concentrated water outlet and a fresh water outlet, the concentrated water outlet is connected with the concentrated water tank (4), and the fresh water outlet is communicated with a next-level sewage treatment plant for water treatment;
a concentrated water outlet of the concentrated water tank (4) is connected with an evaporative crystallization system (5) so as to lead the separated fresh water to a next-level sewage treatment plant for water treatment;
the evaporative crystallization system (5) comprises an MVR evaporator (51) and a solid-liquid separator (52) which are sequentially connected, and mother liquor separated by the MVR evaporator (51) and the solid-liquid separator (52) is dried by spray drying equipment (53).
2. The hazardous waste landfill wastewater treatment system of claim 1, wherein: the multistage filtering device of the membrane concentration system (3) comprises a multi-medium filter (31), an activated carbon filter (32) and a cartridge filter (33) which are connected in sequence.
3. The hazardous waste landfill wastewater treatment system of claim 2, wherein: the multistage filtering device of the membrane concentration system (3) is pressurized by a high-pressure pump (35) and then is conveyed into a disc-tube type reverse osmosis device (34).
4. The hazardous waste landfill wastewater treatment system of any one of claims 1 to 3, wherein: the sludge outlet of the coagulating sedimentation system (24) of the pretreatment system (2) is connected with a sludge treatment system (6), the sludge treatment system (6) comprises a sludge concentration tank (61) and a plate and frame filter press (62) which are sequentially connected with the sludge outlet of the coagulating sedimentation system (24), filtrate of the plate and frame filter press (62) is returned to the wastewater adjusting tank (1) for circular treatment, and sludge of the plate and frame filter press (62) is subjected to centralized external treatment.
5. The hazardous waste landfill wastewater treatment system of claim 4, wherein: the dissolved air flotation system (21), the reduction neutralization reaction system (22), the sodium carbonate softening reaction tank (23) and the coagulating sedimentation system (24) of the pretreatment system (2) are all provided with a dosing device (25), the dosing devices are respectively connected with the dissolved air flotation system (21), the reduction neutralization reaction system (22), the sodium carbonate softening reaction tank (23) and the coagulating sedimentation system (24) which correspond to the dosing devices, the dosing devices are used for adding corresponding medicaments to the reaction systems, and the dosing devices (25) are connected with a PLC control device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922097321.9U CN211419883U (en) | 2019-11-29 | 2019-11-29 | Hazardous waste landfill effluent disposal system |
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| CN201922097321.9U CN211419883U (en) | 2019-11-29 | 2019-11-29 | Hazardous waste landfill effluent disposal system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112225372A (en) * | 2020-09-17 | 2021-01-15 | 广东闻扬环境科技有限公司 | Landfill leachate wastewater treatment system and treatment method |
| CN114835338A (en) * | 2022-04-24 | 2022-08-02 | 东莞市新东欣环保投资有限公司 | Method for treating percolate concentrated solution of refuse landfill |
-
2019
- 2019-11-29 CN CN201922097321.9U patent/CN211419883U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112225372A (en) * | 2020-09-17 | 2021-01-15 | 广东闻扬环境科技有限公司 | Landfill leachate wastewater treatment system and treatment method |
| CN112225372B (en) * | 2020-09-17 | 2021-11-23 | 广东闻扬环境科技有限公司 | Landfill leachate wastewater treatment system and treatment method |
| CN114835338A (en) * | 2022-04-24 | 2022-08-02 | 东莞市新东欣环保投资有限公司 | Method for treating percolate concentrated solution of refuse landfill |
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Address after: 210012 rooms 602, 603, 604 and 605, building 1, No. 32, Dazhou Road, Yuhuatai District, Nanjing City, Jiangsu Province Patentee after: Jiangsu Zhenyi Environmental Protection Technology Co.,Ltd. Address before: 210012 rooms 602, 603, 604 and 605, building 1, No. 32, Dazhou Road, Yuhuatai District, Nanjing City, Jiangsu Province Patentee before: JIANGSU ZHENYI ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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