CN219098923U

CN219098923U - Sewage treatment system for mixed salt, high organic matters and fluoride

Info

Publication number: CN219098923U
Application number: CN202223356405.8U
Authority: CN
Inventors: 陈永勤; 薛帅
Original assignee: Suzhou Hongsheng Environmental Protection Technology Co ltd
Current assignee: Suzhou Hongsheng Environmental Protection Technology Co ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-05-30
Anticipated expiration: 2032-12-12

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment system for mixed salt, high organic matters and fluoride; comprises a mixed salt pretreatment module, an MVR module and a single-effect evaporation module; the mixed salt pretreatment module removes fluoride and partial organic matters by adding sodium hydroxide, calcium chloride, PAC, PAM and fluorine removing agent into sewage, and the concentration of salt in MVR concentrated water obtained by the MVR module treatment is controlled to be 18% -22%; the single-effect evaporation module is used for evaporating and concentrating the MVR concentrated water obtained by the MVR module; the MVR module has low operation cost, less steam consumption in the single-effect evaporation module, efficiency and energy consumption, and better benefit and applicability, and meanwhile, the MVR module is prevented from being blocked in the MVR evaporator.

Description

Sewage treatment system for mixed salt, high organic matters and fluoride

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment system for mixed salt, high organic matters and fluoride.

Background

In the salt-containing wastewater, high-salt, high-organic wastewater and fluoride are wastewater which is difficult to treat, if salt is directly discharged in an MVR system, the concentration multiple of the wastewater is gradually increased in the evaporation process, and the wastewater contains a large amount of organic matters and has complex components, so that jelly is easy to form to cause blockage, the MVR evaporation and crystallization salt product is relatively poor, most of the cases must be treated as dangerous waste, the cost of the external treatment is high, and the problems of blockage of the evaporation system and high energy consumption are also caused; a system for treating sewage containing mixed salt, high-organic matter and fluoride is disclosed to solve the problems existing in the prior art.

Disclosure of Invention

The utility model aims at: provides a sewage treatment system for mixed salt, high organic matters and fluoride, which solves the related problems in the prior art.

The technical scheme of the utility model is as follows: a sewage treatment system for mixed salt, high organic matters and fluoride comprises a mixed salt pretreatment module, an MVR module and a single-effect evaporation module; the mixed salt pretreatment module is used for removing fluoride and part of organic matters by adding sodium hydroxide, calcium chloride, PAC, PAM and fluorine removing agents into sewage, and the concentration of salt in MVR concentrated water obtained by the MVR module treatment is controlled to be 18% -22%; the single-effect evaporation module is used for evaporating and concentrating the MVR concentrated water obtained by the MVR module.

Preferably, the concentration of salt in the MVR concentrated water obtained by the MVR module treatment is controlled to be 20%.

Preferably, the mixed salt pretreatment module comprises an adjusting tank, a sodium hydroxide delivery tank, a calcium chloride delivery tank, a PAC and PAM delivery tank, a defluorinating agent delivery tank, a sedimentation tank and an intermediate tank.

Preferably, the MVR module comprises a plate type preheater, a condensate water tank, a heater, a separator, an MVR concentrated solution collecting tank and a forced circulation pump, wherein a water inlet of the plate type preheater is communicated with the middle tank.

Preferably, the single-effect evaporation module comprises a preheater, a heating chamber, a separation chamber and a condenser, wherein a water inlet of the preheater is communicated with the MVR concentrated solution collecting tank.

Preferably, a vacuum pump is connected to the condenser.

Compared with the prior art, the utility model has the advantages that:

according to the sewage treatment system for mixed salt, high organic matters and fluoride, the concentration of salt in MVR concentrated water obtained by treatment of the MVR module is controlled to be 18% -22%, so that the wastewater is effectively concentrated and is not blocked, then MVR concentrated liquid is conveyed to the single-effect evaporation module, and as the concentrated liquid amount in the MVR concentrated liquid is greatly reduced, the wastewater can be further evaporated by using less steam to obtain final mother liquor and condensed water. The MVR module has low operation cost, less steam consumption in the single-effect evaporation module, efficiency and energy consumption, and better benefit and applicability, and meanwhile, the MVR module is prevented from being blocked in the MVR evaporator.

Drawings

The utility model is further described below with reference to the accompanying drawings and examples:

FIG. 1 is a flow chart of a system for treating wastewater containing salt, high organic matters and fluoride according to the embodiment;

fig. 2 is a schematic structural diagram of a sewage treatment system with mixed salt, high organic matters and fluoride according to the embodiment.

Wherein: 1. the device comprises an adjusting tank, 2, a sodium hydroxide delivery tank, 3, a calcium chloride delivery tank, 4, PAC and PAM delivery tanks, 5, a defluorinating agent delivery tank, 6, a sedimentation tank, 7, an intermediate tank, 8, a plate-type preheater, 9, a condensate water tank, 10, a heater, 11, a separator, 12, an MVR concentrated solution collecting tank, 13, a forced circulation pump, 14, a preheater, 15, a heating chamber, 16, a separation chamber, 17, a condenser, 18 and a vacuum pump.

Detailed Description

The following describes the present utility model in further detail with reference to specific examples:

in the description of the utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

As shown in figure 1, the system for treating the sewage of the mixed salt, the high organic matters and the fluoride comprises a mixed salt pretreatment module, an MVR module and a single-effect evaporation module; the mixed salt pretreatment module removes fluoride and partial organic matters by adding sodium hydroxide, calcium chloride, PAC, PAM and fluorine removing agent into sewage, and the concentration of salt in MVR concentrated water obtained by the MVR module treatment is controlled to be 18% -22%; and the single-effect evaporation module is used for evaporating and concentrating the MVR concentrated water obtained by the MVR module. In this embodiment, the concentration of salt in the MVR concentrate obtained by the MVR module treatment is controlled to be 20%. As shown in fig. 2, the mixed salt pretreatment module comprises an adjusting tank 1, a sodium hydroxide putting tank 2, a calcium chloride putting tank 3, a PAC and PAM putting tank 4, a fluorine removing agent putting tank 5, a sedimentation tank 6 and an intermediate tank 7. The MVR module comprises a plate-type preheater 8, a condensate water tank 9, a heater 10, a separator 11, an MVR concentrated solution collecting tank 12 and a forced circulation pump 13, wherein a water inlet of the plate-type preheater 8 is communicated with the middle tank 7. The single-effect evaporation module comprises a preheater 14, a heating chamber 15, a separation chamber 16 and a condenser 17, wherein a water inlet of the preheater 14 is communicated with the MVR concentrated solution collection tank 12. The condenser 17 is connected with a vacuum pump 18.

The working principle of the sewage treatment system for the mixed salt, the high organic matters and the fluoride in the embodiment is as follows: the sewage firstly removes large-particle suspended substances and then enters an adjusting tank 1 to adjust the water quantity and the water quality; the sewage regulated by the regulating tank 1 passes through a sodium hydroxide delivery tank 2, a calcium chloride delivery tank 3, a PAC and PAM delivery tank 4, a defluorinating agent delivery tank 5, a sedimentation tank 6 and an intermediate tank 7, so that fluoride and partial organic matters in the sewage are removed, the sewage is softened, and then the sewage enters an MVR module; the softened sewage is preheated by the plate type preheater 8 and then enters the heater 10, the steam after heating treatment is discharged to the separator 11 from the top end of the heater 10, the non-volatile fluid in the heater 10 falls into the bottom end of the heater 10, the steam discharged from the heater 10 flashes in the separator 11, the steam in the separator 11 is discharged from the upper part of the separator 11, the fluid falls under resistance and is converged at the bottom of the separator 11, the fluid at the bottom of the separator 11 is sucked into the heater 10 by the forced circulation pump 13, circulation is continued, and when the concentration of the fluid salt in the separation pipe reaches 20%, the MVR concentrated solution is obtained by discharging from the bottom of the separator 11, so that the sewage is effectively concentrated and no blocking phenomenon is caused; and then the MVR concentrated solution is conveyed to a single-effect evaporation module, and as the concentrated solution amount in the MVR concentrated solution is greatly reduced, the wastewater can be further evaporated by using less steam to obtain final mother solution and condensed water.

The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same according to the content of the present utility model, and are not intended to limit the scope of the present utility model. It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments and that the present utility model may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present utility model be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A sewage treatment system of mixed salt, high organic matter and fluoride is characterized in that: comprises a mixed salt pretreatment module, an MVR module and a single-effect evaporation module; the mixed salt pretreatment module is used for removing fluoride and part of organic matters by adding sodium hydroxide, calcium chloride, PAC, PAM and fluorine removing agents into sewage, and the concentration of salt in MVR concentrated water obtained by the MVR module treatment is controlled to be 18% -22%; the single-effect evaporation module is used for evaporating and concentrating the MVR concentrated water obtained by the MVR module.

2. The system for treating sewage containing mixed salt, high organic matters and fluoride according to claim 1, wherein the system comprises the following components: the concentration of salt in MVR concentrated water obtained by the MVR module treatment is controlled at 20%.

3. The system for treating the sewage containing the mixed salt, the high organic matters and the fluoride according to claim 2, wherein the system is characterized in that: the mixed salt pretreatment module comprises an adjusting tank, a sodium hydroxide delivery tank, a calcium chloride delivery tank, a PAC and PAM delivery tank, a fluorine removal agent delivery tank, a sedimentation tank and an intermediate tank.

4. A system for treating contaminated water with impurities, high organic matters and fluorides according to claim 3, wherein: the MVR module comprises a plate type preheater, a condensate water tank, a heater, a separator, an MVR concentrated solution collecting tank and a forced circulation pump, wherein a water inlet of the plate type preheater is communicated with the middle tank.

5. The system for treating sewage containing mixed salt, high organic matters and fluoride according to claim 4, wherein the system comprises the following components: the single-effect evaporation module comprises a preheater, a heating chamber, a separation chamber and a condenser, wherein a water inlet of the preheater is communicated with the MVR concentrated solution collecting tank.

6. The system for treating sewage containing mixed salt, high organic matters and fluoride according to claim 5, wherein the system comprises the following components: the condenser is connected with a vacuum pump.