CN217148782U

CN217148782U - Desulfurization waste water discharge to reach standard processing apparatus

Info

Publication number: CN217148782U
Application number: CN202122043309.7U
Authority: CN
Inventors: 王峰; 许勇毅; 赵翠仙; 张�杰
Original assignee: Cpi Shentou Power Generation Co ltd; Clp Huachuang Power Technology Research Co ltd; Anhui Xinli Electric Technology Consulting Co Ltd
Current assignee: Cpi Shentou Power Generation Co ltd; Clp Huachuang Power Technology Research Co ltd; Anhui Xinli Electric Technology Consulting Co Ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-08-09
Anticipated expiration: 2031-08-27

Abstract

The utility model relates to a desulfurization waste water discharge to reach standard processing apparatus, the device include along desulfurization waste water treatment direction connect gradually reaction tank, sedimentation tank and the oxidation pond of setting, be equipped with the catalysis subassembly of built-in transition metal catalyst in the oxidation pond, still be equipped with the aeration subassembly in the bottom of oxidation pond. Compared with the prior art, the utility model discloses can effectively get rid of suspended solid, heavy metal, sulphide, COD in the desulfurization waste water and get rid of the fluoride in coordination, have that area is little, process flow is simple, with low costs, advantage such as efficient have the popularization meaning.

Description

Desulfurization waste water discharge to reach standard processing apparatus

Technical Field

The utility model belongs to the technical field of desulfurization waste water treatment, a desulfurization waste water discharge to reach standard processing apparatus is related to.

Background

In the coal-fired power generation industry, after ultra-low emission modification, a gypsum-limestone wet desulphurization process is widely used, and the wet desulphurization needs to maintain the chloride ion balance in a desulphurization tower by discharging a certain amount of waste water, namely the desulphurization waste water. The desulfurized wastewater has very large water quality fluctuation range and high salt content, especially Cl ^- 、SO ₄ ^2- 、Ca ²⁺ 、Mg ²⁺ 、F ^- The suspended matter content is high, the heavy metal content exceeds the standard, the COD content is high, and the wastewater has certain corrosivity, which is a difficult point of wastewater treatment in the thermal power industry. According to the standard DL/T997-.

At present, the most common treatment method for desulfurization wastewater is a 'triple box' process, wherein the triple box refers to a neutralization box, a reaction box and a flocculation box. Lime milk or sodium hydroxide is added into the neutralization tank, the pH value of the wastewater is adjusted through stirring, and most heavy metals form insoluble hydroxides to precipitate in the process. And the effluent water in the neutralization tank automatically flows to a reaction tank, organic sulfur and a coagulant are added into the reaction tank, residual heavy metals which cannot be precipitated in the hydroxide form are removed in the sulfide precipitation form, the effluent water of the reaction tank enters a flocculation tank, a coagulant aid is added into the flocculation tank for flocculation reaction, and the effluent water of the flocculation tank automatically flows into a clarifier. And 3, enabling flocs in the wastewater to further grow in the clarifier, performing precipitation separation through an inclined plate (or an inclined pipe), and enabling the upper clear water to automatically flow into a clear water tank after the pH value of the upper clear water is adjusted to 6-9 by adding acid. And conveying the sludge of the clarifier to a filter press for filter pressing. The desulfurization waste water treated by the method can basically reach the discharge standard.

However, the process has the disadvantages of multiple types of added chemicals, complex flow, complex control system, large occupied area and introduction of new pollutants. The addition of various (5 or more) medicaments is needed, the addition of a dosing system, particularly lime milk, is easy to fail, the overall dosing stability is poor, the operation of a clarification system is unstable, the adjustment and management difficulty is high, the SS, COD and heavy metal contents of effluent in operation are easy to exceed the standards, and the emission standard reaching rate is low; the number of running devices is large, and running management is relatively complex; the equipment is more, for example, dosing equipment, and the mud water solid content rate that the clarification technology came out is lower, can't directly get into the filter pressing unit mostly, needs supporting mud regulation, concentration and balanced system. In view of this, the utility model is especially provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a desulfurization waste water discharge to reach standard processing apparatus.

The purpose of the utility model can be realized through the following technical scheme:

one of the technical scheme of the utility model provides a desulfurization waste water discharge to reach standard processing apparatus, include reaction tank, sedimentation tank and the oxidation pond that connects gradually the setting along desulfurization waste water treatment direction, be equipped with the catalysis subassembly of built-in transition metal catalyst in the oxidation pond, still be equipped with the aeration subassembly in the bottom of oxidation pond.

Furthermore, the top of the reaction tank is also provided with a medicine storage box internally provided with a reaction and precipitation medicine.

Furthermore, the medicine storage box is also connected with a medicine feeding pump.

Furthermore, a stirring component is also arranged in the reaction tank.

Furthermore, a sludge treatment assembly is arranged at the bottom of the sedimentation tank.

Furthermore, the catalytic assembly is a porous plate box fixed on the side wall of the oxidation pond, water permeable holes are distributed on the porous plate box, and the transition metal catalyst is filled in the porous plate box.

Further, the pore diameter of the transition metal catalyst is not smaller than that of the water permeable pores.

Furthermore, the perforated plate box is horizontally arranged on the inner wall of the oxidation pond.

Furthermore, the perforated plate box adopts a modular design.

The second technical scheme of the utility model provides a desulfurization waste water discharge to reach standard processing method, it adopts as above arbitrary processing apparatus, this processing method includes following step:

(1) feeding the desulfurization wastewater into a reaction tank, mixing the desulfurization wastewater with an added reaction precipitation reagent, and reacting, wherein the obtained treated wastewater after reaction is continuously fed into a precipitation tank for precipitation;

(2) and discharging the supernatant in the sedimentation tank into an oxidation tank for oxidation treatment, discharging the supernatant to the outside through a bottom purified water outlet, and discharging and collecting the precipitated sludge obtained in the sedimentation tank to finish the process.

Compared with the prior art, the utility model has the advantages of it is following:

(1) compared with the traditional triple box technology, the technical scheme has the advantages of small occupied area, low cost and high automation degree;

(2) only one medicament is added in the treatment process, the dosage is less, and the slag amount is less;

(3) the process is simple and short in flow, equipment can be designed and assembled in a modularized manner, the treatment efficiency is high, the effect is remarkable, the removal rate of suspended matters and heavy metals reaches over 99 percent, the COD of effluent is less than or equal to 150mg/L, the treatment requirement of desulfurization wastewater can be completely met, and the method is worthy of popularization and application.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic structural view of a treatment apparatus according to the present invention;

FIG. 3 is a schematic structural view of a catalytic assembly;

the notation in the figure is:

1-desulfurization wastewater inlet water, 2-dosing pump, 3-medicine storage tank, 4-reaction tank, 5-stirring component, 6-sedimentation tank, 7-sludge treatment component, 8-oxidation tank, 9-catalysis component, 901-porous plate box, 902-water permeable hole, 10-purified water outlet and 11-aeration component.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

In the following examples, the adopted reaction precipitation medicament is DBS medicament purchased from penicillin in environmental protection or other medicaments of the same type and transition metal catalysts, and is directly prepared according to the patent application number CN 201910613987.7.

And the rest of the functional components or structures which are not specifically described indicate the conventional components or structures adopted by the field for realizing the corresponding functions.

Example 1:

the embodiment provides a desulfurization waste water discharge treatment device up to standard, and its structure is seen in fig. 2, including connecting gradually reaction tank 4, sedimentation tank 6 and the oxidation pond 8 that sets up along desulfurization waste water treatment direction, be equipped with the catalysis subassembly 9 of built-in transition metal catalyst in the oxidation pond 8, still be equipped with aeration subassembly 11 in the bottom of oxidation pond 8. The top of the reaction tank 4 is also provided with a medicine storage box 3 with a built-in reaction precipitation medicine. The medicine storage box 3 is also connected with a medicine feeding pump 2. The reaction tank 4 is also provided with a stirring assembly 5, and the stirring assembly 5 here can be a stirring device conventional in the art, such as a stirring shaft with stirring blades. The bottom of the sedimentation tank 6 is provided with a sludge treatment component 7, and the sludge treatment component 7 can adopt conventional sludge treatment and collection equipment with collection and/or filter pressing functions in the field. Referring to fig. 2 again, the reaction tank 4 and the sedimentation tank 6 share one side wall, so that the effluent in the reaction tank 4 can directly flow into the sedimentation tank 6 from the shared side wall after the reaction is completed, and the sedimentation treatment is continued, so that the floor area can be greatly reduced, and the flow is simpler.

The catalytic assembly 9 is a perforated plate case 901 fixed on the side wall of the oxidation pond 8, as shown in fig. 3, the catalyst-filled perforated plate case 901 is distributed with water permeable holes 902, and the transition metal catalyst is filled in the catalyst-filled perforated plate case 901. The pore diameter of the transition metal catalyst is not smaller than the pore diameter of the water permeable pores 902. The catalyst filling perforated plate box 901 is horizontally arranged on the inner wall of the oxidation pond 8 to separate the oxidation pond, so that the desulfurization wastewater entering from the upper part can be discharged after being treated by the catalyst, and the uniform treatment effect on the wastewater is further improved. In addition, in order to avoid the accumulation of the transition metal catalyst in the perforated plate case 901 and improve the contact effect between the desulfurization wastewater and the catalyst, the perforated plate case 901 for filling the catalyst may have a modular structure.

Based on the treatment device shown in fig. 2, the present embodiment further provides the following method for treating desulfurization wastewater to reach emission standard, wherein the process flow of the method is shown in fig. 1, and the treatment method comprises the following steps:

(1) feeding the desulfurization wastewater into a reaction tank 4, mixing the desulfurization wastewater with an added reaction precipitation reagent, and reacting, wherein the obtained treated wastewater after reaction overflows into a precipitation tank 6 for precipitation;

(2) and discharging the supernatant in the sedimentation tank 6 into an oxidation tank 8 for oxidation treatment, discharging the obtained purified water outlet 10 to the outside through a purified water outlet at the bottom, and discharging and collecting the precipitated sludge obtained in the sedimentation tank 6 to finish the process.

Specifically, the addition amount of the reaction precipitation agent is 315g/m ³ (ii) a The hydraulic retention time of the reaction tank 4, the sedimentation tank 6 and the oxidation tank 8 is respectively 30 minutes, 20 minutes and 20 minutes, and the aeration rate of the oxidation tank is 6m ³ /h。

When the process flow is applied to actual treatment, specific treatment objects are as follows: the discharge capacity of the desulfurization waste water of a certain 600MW supercritical coal-fired unit is about 15m ³ The water quality of the treated effluent completely reaches the discharge standard, and the indexes of the raw water quality and the treated water quality are shown in the following table 1.

TABLE 1

Compared with the prior triple box technology, the treatment cost is reduced by about 30-40%, the automatic control level is obviously improved, and the effluent stability is better.

Example 2:

compared with the embodiment 1, most of the catalyst is the same, except that the catalytic assembly 9 is not arranged in the embodiment, the catalyst is directly added and placed in the oxidation box, the aeration amount of the aeration assembly 11 is enhanced, or the aeration assembly 11 is modified into a jet pump, so that the flow of the wastewater in the oxidation box is increased, the catalyst is suspended in the wastewater, the contact effect of the catalyst and the desulfurization wastewater can be further improved, and the integral filling amount of the catalyst is reduced, therefore, the catalyst is more convenient to replace relatively.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims

1. The utility model provides a desulfurization waste water discharge to reach standard processing apparatus which characterized in that includes and connects gradually reaction tank, sedimentation tank and the oxidation pond that sets up along desulfurization waste water treatment direction, be equipped with the catalytic component of built-in transition metal catalyst in the oxidation pond, still be equipped with the aeration subassembly in the bottom of oxidation pond.

2. The desulfurization wastewater discharge-reaching treatment device according to claim 1, wherein a drug storage box with a built-in reaction precipitation drug is further arranged at the top of the reaction tank.

3. The desulfurization wastewater discharge-reaching treatment device according to claim 2, wherein the drug storage tank is further connected with a drug feeding pump.

4. The desulfurization waste water discharge-to-standard treatment device according to claim 1, wherein a stirring component is further arranged in the reaction tank.

5. The desulfurization waste water discharge-to-standard treatment device as claimed in claim 1, wherein a sludge treatment component is arranged at the bottom of the sedimentation tank.

6. The desulfurization wastewater discharge-reaching treatment device of claim 1, wherein the catalytic component is a perforated plate box fixed on the side wall of the oxidation pond, water permeable holes are distributed on the perforated plate box, and the transition metal catalyst is filled in the perforated plate box.

7. The apparatus of claim 6, wherein the diameter of the transition metal catalyst is not smaller than the diameter of the water-permeable pores.

8. The desulfurization wastewater discharge-reaching treatment device of claim 6, wherein the perforated plate box is horizontally arranged on the inner wall of the oxidation pond in a transverse mode.

9. The desulfurization waste water discharge-to-standard treatment device of claim 6, wherein the perforated plate box is of modular design.

10. The desulfurization waste water discharge-to-standard treatment device of claim 1, wherein the reaction tank and the sedimentation tank share a side tank wall.