CN-224226829-U - Concentrated alkali wastewater recycling system in solar cell production

Abstract

The utility model discloses a recycling system of concentrated alkali wastewater in solar cell production, which comprises a concentrated alkali wastewater collection module, a pretreatment module, a membrane separation module, a recycling module and a permeate treatment module, wherein the concentrated alkali wastewater collection module is used for collecting concentrated alkali wastewater, the pretreatment module is connected with the concentrated alkali wastewater collection module and used for carrying out precipitation treatment and pH adjustment on the collected concentrated alkali wastewater, the membrane separation module is connected with the pretreatment module and used for carrying out membrane separation on the pretreated concentrated alkali wastewater, the recycling module is connected with the membrane separation module and used for recycling concentrated alkali after membrane separation, and the permeate treatment module is connected with the membrane separation module and used for carrying out retreatment before discharging permeate after membrane separation. The method is used for collecting and reutilizing alkaline water in the TOPCon solar cell production process, the influence of particles in waste liquid on a transportation pipeline and on reutilization equipment is avoided by preprocessing the waste water, and concentrated alkaline liquid is obtained through concentration and separation, so that the reutilization of the alkaline water by the reutilization equipment is facilitated.

Inventors

• CHEN LIJIAO
• YU GUOXI
• WANG LI
• LI WEI
• Hu Suliang
• GOU QUAN

Assignees

• 楷德电子工程设计有限公司

Dates

Publication Date

20260512

Application Date

20250417

Claims (5)

1. 1. A system for recycling concentrated alkali wastewater in solar cell production is characterized by comprising The concentrated alkali wastewater collection module is used for collecting concentrated alkali wastewater; The pretreatment module is connected with the concentrated alkali wastewater collection module and is used for carrying out precipitation treatment and pH adjustment on the collected concentrated alkali wastewater; The membrane separation module is connected with the pretreatment module and is used for carrying out membrane separation on the pretreated concentrated alkali wastewater; a recycling module connected with the membrane separation module for recycling the concentrated alkali after membrane separation, and And the permeate treatment module is connected with the membrane separation module and is used for reprocessing permeate after membrane separation before discharge.
2. 2. The recycling system of concentrated alkali wastewater in solar cell production according to claim 1, further comprising a concentration adjusting module connected between the membrane separation module and the recycling module.
3. 3. The recycling system for concentrated alkali wastewater in solar cell production according to claim 1, wherein the pretreatment module comprises a sedimentation tank, a filter frame is arranged on the water inlet side in the sedimentation tank, and the sedimentation tank is provided with an adjusting unit for adjusting the pH value of liquid.
4. 4. The system for recycling concentrated alkali wastewater in solar cell production according to claim 3, wherein the adjusting unit comprises a stirrer, a pH monitor and a reagent adding area.
5. 5. The recycling system of concentrated alkali wastewater in solar cell production according to claim 1, wherein the recycling module is an acid-base washing tower in TOPCon cell production process.

Description

Concentrated alkali wastewater recycling system in solar cell production Technical Field The utility model relates to the field of industrial wastewater treatment, in particular to a concentrated alkali wastewater recycling system in solar cell production. Background At present, in the photovoltaic industry, concentrated alkali wastewater generally adopts a traditional materialization treatment mode, namely, the concentrated alkali wastewater generated in a workshop is singly collected to a wastewater station, enters a regulating tank, is neutralized with concentrated acid wastewater to perform processes such as a defluorination system, a desilication system, a hardness removal system and the like, and is precipitated to separate out silicate, and effluent is directly discharged after reaching the standard. The treatment mode has certain defects, when the concentrated alkali wastewater and the concentrated acid wastewater are mixed, silicate crystals are easy to form if the concentrated alkali wastewater and the concentrated acid wastewater are excessive according to a certain proportion, the pressure of a rear-end treatment system is increased, a membrane is blocked if the rear end is provided with a membrane system, meanwhile, a collection tank and an adjusting tank are required to be arranged independently, the occupied area of a wastewater station is larger, and the sewage treatment cost is increased. With the continuous emphasis on green development in recent years, at present, some factories begin to explore a method for recovering the concentrated alkali wastewater, and the concentrated alkali wastewater is recycled. There are generally evaporation crystallization methods in which concentrated alkali wastewater is evaporated and crystallized and then separated out in a crystallization form, and in addition, ion exchange resins are used to adsorb alkali ions in the wastewater, and when the resin is saturated by adsorption, the alkali ions are eluted by a regeneration process to recover alkali liquor. However, these recycling methods still have certain drawbacks, including high technical difficulty and cost, high energy consumption, carbon emission, low recycling efficiency, difficult treatment of impurities, and the like. Disclosure of utility model Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a recycling system of concentrated alkali wastewater in solar cell production, which is used for collecting and reutilizing alkaline water in TOPCon (Tunnel Oxide Passivated Contact) solar cell production process, and the influence of particles in waste liquid on transportation pipelines and on reutilization equipment is avoided by pretreatment of wastewater, and concentrated alkali liquid is obtained by concentration and separation, so that the reutilization of alkaline water by the reutilization equipment is facilitated. In particular to a concentrated alkali wastewater recycling system in solar cell production, which comprises The concentrated alkali wastewater collection module is used for collecting concentrated alkali wastewater; The pretreatment module is connected with the concentrated alkali wastewater collection module and is used for carrying out precipitation treatment and pH adjustment on the collected concentrated alkali wastewater; The membrane separation module is connected with the pretreatment module and is used for carrying out membrane separation on the pretreated concentrated alkali wastewater; a recycling module connected with the membrane separation module for recycling the concentrated alkali after membrane separation, and And the permeate treatment module is connected with the membrane separation module and is used for reprocessing permeate after membrane separation before discharge. Optionally, the system further comprises a concentration adjusting module connected between the membrane separation module and the reuse module, wherein the concentration adjusting module mixes the recovered alkali liquor with the fresh alkali liquor, so that the alkali liquor concentration is changed to adapt to the requirement of the reuse module on the alkali liquor concentration. Optionally, the pretreatment module comprises a sedimentation tank, a filter frame is arranged on the water inlet side in the sedimentation tank, and the sedimentation tank is provided with an adjusting unit for adjusting the pH value of the liquid. Optionally, the adjusting unit comprises a stirrer, a pH monitor and a medicament adding zone. Optionally, the recycling module is an acid-base washing tower in the TOPCon battery production process. The utility model has the following advantages: the utility model relates to a recycling system of concentrated alkali wastewater in solar cell production, which is used for collecting and recycling alkaline water in TOPCon (Tunnel Oxide Passivated Contact) solar cell production processes, and the pretreatment of wastewater avoids the blocking