阅读说明：本技术 一种高效黑硅含银废水处理系统及方法 (Efficient black silicon and silver-containing wastewater treatment system and method ) 是由 候成成 张一源 管自生 于 2019-11-19 设计创作，主要内容包括：本发明涉及高效太阳能多晶电池制造技术领域,且公开了一种高效黑硅含银废水处理系统,包括收集桶、沉淀桶、银离子沉降剂、排液桶和废水池；所述收集桶,其具体为：对黑硅制绒机中的镀银槽、挖孔槽、脱银槽的含银废水进行收集；所述沉淀桶,其具体为：对收集桶内的Ag+进行沉淀处理；所述银离子沉降剂,其具体为：与沉淀桶内的Ag+发生物理及化学反应,使得Ag+发生沉淀；所述排液桶,其具体为：对沉淀桶内的上清液进行收集处理；所述废水池,其具体为：将排液桶内合格的废水排放至废水池。该高效黑硅含银废水处理系统及方法,能够解决目前处理方式成本昂贵,会产生二次的污染,还很容易达不到理想处理效果的问题。(The invention relates to the technical field of manufacturing of high-efficiency solar polycrystalline batteries, and discloses a high-efficiency black silicon silver-containing wastewater treatment system which comprises a collecting barrel, a settling barrel, a silver ion settling agent, a liquid discharge barrel and a wastewater pool, wherein the collecting barrel is used for collecting silver ions; the collecting vessel, it specifically is: silver-containing wastewater of a silver plating tank, a hole digging tank and a silver removing tank in the black silicon texturing machine is collected; the sediment bucket, it specifically is: carrying out precipitation treatment on Ag + in the collecting barrel; the silver ion settling agent comprises the following specific components: the Ag + in the precipitation barrel is subjected to physical and chemical reaction to precipitate the Ag +; the liquid discharge barrel specifically comprises: collecting the supernatant in the precipitation barrel; the wastewater pool specifically comprises: and discharging qualified wastewater in the liquid discharge barrel to a wastewater pool. The high-efficiency black silicon silver-containing wastewater treatment system and method can solve the problems that the existing treatment mode is high in cost, secondary pollution is generated, and an ideal treatment effect cannot be easily achieved.)

1. A high-efficiency black silicon silver-containing wastewater treatment system is characterized by comprising a collecting barrel, a settling barrel, a silver ion settling agent, a liquid discharge barrel and a wastewater pool;

the collecting vessel, it specifically is: silver-containing wastewater of a silver plating tank, a hole digging tank and a silver removing tank in the black silicon texturing machine is collected;

the sediment bucket, it specifically is: carrying out precipitation treatment on Ag + in the collecting barrel;

the silver ion settling agent comprises the following specific components: the Ag + in the sedimentation barrel and the Ag + are subjected to physical and chemical reactions to form flocculent sediments, so that the effect of sedimentation is achieved;

the liquid discharge barrel specifically comprises: collecting the supernatant in the precipitation barrel;

the wastewater pool specifically comprises: and discharging qualified wastewater in the liquid discharge barrel to a wastewater pool.

2. The high-efficiency black silicon silver-containing wastewater treatment method is characterized by comprising the following steps:

s1: silver-containing wastewater in a silver plating tank, a hole digging tank and a silver removing tank in the black silicon texturing machine is directly discharged into a collecting barrel through pipelines to wait for treatment;

s2: after reaching a preset liquid level, respectively pumping the waste liquid in the collecting barrel into a precipitation barrel through a magnetic pump for Ag + precipitation treatment;

s3: when the precipitation barrel reaches a preset liquid level, adding a silver ion settling agent into the precipitation barrel, and then fully stirring to ensure that Ag + is gradually precipitated;

s4: after the set time is reached, injecting the treated supernatant into a liquid discharge barrel through a magnetic pump;

s5: detecting the concentration of silver ions, and discharging the silver ions into a wastewater pool after the silver ions are qualified; if the qualified product is not qualified, injecting the product into the precipitation barrel again through a magnetic pump for secondary treatment, and discharging the product after reaching the standard;

s6: and after the supernatant in the settling barrel is treated, taking out the silver-containing sludge in the settling barrel.

3. The high-efficiency black silicon silver-containing wastewater treatment method according to claim 2, characterized in that: the magnetic pump is controlled by a PLC program.

4. The high-efficiency black silicon silver-containing wastewater treatment method according to claim 2, characterized in that: in the step S3, the liquid medicine is automatically added into the precipitation barrel through the quantitative pump, and the solid medicine is manually added into the precipitation barrel at regular time.

5. The high-efficiency black silicon silver-containing wastewater treatment method according to claim 2, characterized in that: and in the step S3, the waste liquid of the silver ion settling agent added into the settling barrel is stirred by a stirrer, the stirring time of the stirrer is 30-120min, and the standing time is 30-120 min.

6. The high-efficiency black silicon silver-containing wastewater treatment method according to claim 2, characterized in that: in the step S4, an online silver ion testing system is installed at the tail of the discharge port of the liquid discharge barrel, and the concentration of silver ions is detected through the online silver ion testing system.

7. The high-efficiency black silicon silver-containing wastewater treatment method according to claim 2, characterized in that: in the S5, the concentration of silver ions in the supernatant discharged into the wastewater tank is not higher than 0.5 ppm.

8. The high-efficiency black silicon silver-containing wastewater treatment method according to claim 2, characterized in that: and S6, taking out the silver-containing sludge, cleaning the wall of the precipitation barrel, filtering the cleaned cleaning liquid, and carrying out the next treatment on the sludge remained in the cleaning liquid and the silver-containing sludge together.

Technical Field

The invention relates to the technical field of manufacturing of high-efficiency solar polycrystalline batteries, in particular to a high-efficiency black silicon silver-containing wastewater treatment system and method.

Background

With the development of the photovoltaic industry, the cost reduction and efficiency improvement is the main melody of the whole industry. The preparation process of the polycrystalline black silicon battery relies on low cost and high efficiencyBecomes a conventional process in the field of polycrystalline cell preparation. However, during the preparation of the black silicon battery, silver nitrate is used as an auxiliary agent in the hole digging process, and the Ag particles occupy the space on the silicon surface and are H-shaped₂O₂Under an HF system, silicon at the edges of silver particles is alternately oxidized and corroded, the silver particles sink, and hole digging is achieved, so that a black silicon suede with uniform pore size is prepared, silver nitrate in the whole process flow is a necessary product and a consumable product, liquid is regularly drained along with the production process, a large amount of silver-containing wastewater is inevitably generated, and according to preliminary estimation (calculated by 400 machines and 6000 machines per hour), the amount of the silver-containing wastewater generated every day is up to 1000 liters per machine. The detection shows that the content of silver nitrate in the silver-containing wastewater reaches up to 15 ppm. In recent years, the national and related environmental protection departments pay high attention to environmental pollution, especially in the lake around the lake, the discharge standard of waste water is becoming stricter, and the silver-containing waste water is difficult to reach the national discharge standard without special treatment in the production process, and affects the environment, so that the silver-containing waste water is one of the factors which troubles the development of polycrystalline black silicon.

At present, a lot of manufacturers collect silver-containing wastewater and send the silver-containing wastewater to a sewage treatment department with heavy metal treatment qualification, and the silver-containing wastewater is treated by a large amount of hydrochloric acid, calcium sulfide and the like, so that the cost is low, secondary pollution is avoided, and an ideal treatment effect is easily not achieved.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a high-efficiency black silicon silver-containing wastewater treatment system and method, which have the advantages of low cost and no secondary pollution, and solve the problems that the conventional treatment mode is high in cost, can generate secondary pollution and can not achieve ideal treatment effect easily.

(II) technical scheme

In order to realize the purposes of reducing cost and avoiding secondary pollution, the invention provides the following technical scheme: a high-efficiency black silicon silver-containing wastewater treatment system comprises a collecting barrel, a settling barrel, a silver ion settling agent, a liquid discharge barrel and a wastewater pool;

the collecting vessel, it specifically is: silver-containing wastewater of a silver plating tank, a hole digging tank and a silver removing tank in the black silicon texturing machine is collected;

the sediment bucket, it specifically is: carrying out precipitation treatment on Ag + in the collecting barrel;

the silver ion settling agent comprises the following specific components: the Ag + in the sedimentation barrel and the Ag + are subjected to physical and chemical reactions to form flocculent sediments, so that the effect of sedimentation is achieved;

the liquid discharge barrel specifically comprises: collecting the supernatant in the precipitation barrel;

the wastewater pool specifically comprises: and discharging qualified wastewater in the liquid discharge barrel to a wastewater pool.

A high-efficiency black silicon silver-containing wastewater treatment method comprises the following steps:

s1: silver-containing wastewater in a silver plating tank, a hole digging tank and a silver removing tank in the black silicon texturing machine is directly discharged into a collecting barrel through pipelines to wait for treatment;

s2: after reaching a preset liquid level, respectively pumping the waste liquid in the collecting barrel into a precipitation barrel through a magnetic pump for Ag + precipitation treatment;

s3: when the precipitation barrel reaches a preset liquid level, adding a silver ion settling agent into the precipitation barrel, and then fully stirring to ensure that Ag + is gradually precipitated;

s4: after the set time is reached, injecting the treated supernatant into a liquid discharge barrel through a magnetic pump;

s5: detecting the concentration of silver ions, and discharging the silver ions into a wastewater pool after the silver ions are qualified; if the qualified product is not qualified, injecting the product into the precipitation barrel again through a magnetic pump for secondary treatment, and discharging the product after reaching the standard;

s6: and after the supernatant in the settling barrel is treated, taking out the silver-containing sludge in the settling barrel.

Preferably, the magnetic pump is controlled by a PLC program.

Preferably, in S3, the liquid medicine is automatically added into the precipitation barrel by the dosing pump, and the solid medicine is manually added into the precipitation barrel at regular time.

Preferably, in S3, the waste liquid obtained by adding the silver ion settling agent into the settling tank is stirred by a stirrer, the stirring time of the stirrer is 30-120min, and the standing time is 30-120 min.

Preferably, in S4, a silver ion online test system is installed at a tail of the discharge port of the liquid discharge barrel, and the silver ion online test system detects the concentration of the silver ions.

Preferably, in the S5, the concentration of silver ions in the supernatant discharged into the wastewater tank is not higher than 0.5 ppm.

Preferably, in S6, the silver-containing sludge is taken out and then the wall of the precipitation tank is cleaned, and the cleaned cleaning liquid is filtered to perform the following treatment of the sludge remaining in the cleaning liquid together with the silver-containing sludge.

(III) advantageous effects

Compared with the prior art, the invention provides a high-efficiency black silicon silver-containing wastewater treatment system and method, which have the following beneficial effects:

1. the high-efficiency black silicon silver-containing wastewater treatment system and method can be directly connected with a production line in a matched mode, production is not affected, on-line monitoring can be achieved, discharge can be achieved after the test reaches the standard, secondary treatment can be achieved after disqualification is achieved, meanwhile, the whole process flow is simple, and cost is low.

Drawings

FIG. 1 is a design diagram of a high-efficiency black silicon silver-containing wastewater treatment system provided by the invention;

FIG. 2 is a flow chart of a high-efficiency black silicon silver-containing wastewater treatment method provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, a high-efficiency black silicon silver-containing wastewater treatment system comprises a collecting barrel, a settling barrel, a silver ion settling agent, a liquid discharge barrel and a wastewater pool;

the collecting vessel, it specifically is: silver-containing wastewater of a silver plating tank, a hole digging tank and a silver removing tank in the black silicon texturing machine is collected;

the sediment bucket, it specifically is: carrying out precipitation treatment on Ag + in the collecting barrel;

the silver ion settling agent comprises the following specific components: the Ag + in the sedimentation barrel and the Ag + are subjected to physical and chemical reactions to form flocculent sediments, so that the effect of sedimentation is achieved;

the liquid discharge barrel specifically comprises: collecting the supernatant in the precipitation barrel;

the wastewater pool specifically comprises: and discharging qualified wastewater in the liquid discharge barrel to a wastewater pool.

A high-efficiency black silicon silver-containing wastewater treatment method comprises the following steps:

s1: silver-containing wastewater in a silver plating tank, a hole digging tank and a silver removing tank in the black silicon texturing machine is directly discharged into a 10t collecting bucket through pipelines to wait for treatment;

s2: after reaching a preset liquid level, respectively pumping the waste liquid in the collecting barrel into 2 settling barrels with the volume of 3t through a magnetic pump for Ag + settling treatment;

s3: when the precipitation barrel reaches a preset liquid level, adding a silver ion settling agent into the precipitation barrel, and then fully stirring to ensure that Ag + is gradually precipitated;

s4: after the set time is reached, injecting the treated supernatant into a 10t liquid discharge barrel through a magnetic pump;

s5: detecting the concentration of silver ions, and discharging the silver ions into a wastewater pool after the silver ions are qualified; if the qualified product is not qualified, injecting the product into the precipitation barrel again through a magnetic pump for secondary treatment, and discharging the product after reaching the standard;

s6: and after the supernatant in the settling barrel is treated, taking out the silver-containing sludge in the settling barrel.

The magnetic pump is controlled by a PLC program, so that the problem of sensor failure and overflow is prevented.

In the step S3, the liquid medicine is automatically added into the precipitation barrel through the quantitative pump, and the solid medicine is manually added into the precipitation barrel at regular time.

And in the step S3, the waste liquid of the silver ion settling agent added into the settling barrel is stirred by a stirrer, the stirring time of the stirrer is 80min, and the standing time is 90 min.

In the step S4, an online silver ion testing system is installed at the tail of the discharge port of the liquid discharge barrel, and the concentration of silver ions is detected through the online silver ion testing system.

In the S5, the concentration of silver ions in the supernatant discharged into the wastewater tank is not higher than 0.5 ppm.

And S6, taking out the silver-containing sludge, cleaning the wall of the precipitation barrel, filtering the cleaned cleaning liquid, and carrying out the next treatment on the sludge remained in the cleaning liquid and the silver-containing sludge together.

Silver-containing wastewater concentration test report before and after treatment

In conclusion, the high-efficiency black silicon silver-containing wastewater treatment system and method.

It is to be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.