Project Overview

Positioned as a high-efficiency photovoltaic cell manufacturer, the company is engaged in photovoltaic cell manufacturing, R&D and production of TOPCon high-efficiency cells, photovoltaic equipment and component manufacturing, as well as solar power generation technical services.

The project is designed with a wastewater treatment capacity of 2,000 m³/d, with equipment installation and commissioning now completed.

The wastewater stream comprises multiple types, including cutting wastewater, acid washing wastewater, and rinsing wastewater, with certain process streams containing high concentrations of fluoride ions.

Key Technical Challenges

l Given the "segment-specific and type-specific" characteristics of the wastewater, classified pretreatment is required for characteristic pollutants such as high fluoride, high nitrogen, and high hardness.

l The coexistence of hydrofluoric acid, nitric acid, and phosphates makes it challenging to achieve deep fluoride removal at low concentrations, while phosphorus tends to rebound. Conventional single-stage precipitation alone cannot reliably meet the discharge standards.

Process Flow

l Fluoride-containing wastewater: Acid/Alkali Adjustment Tank → Primary Fluoride Removal Sedimentation Tank → Secondary Fluoride Removal Sedimentation Tank → pH Reclamation Tank → Effluent Discharge Tank → Industrial Park WWTP

High-nitrogen wastewater and other low-concentration wastewater: Collection Tank → Biochemical Feed Tank → Primary A/O Tank → Secondary A/O Tank → Biological Sedimentation Tank → Effluent Discharge Tank → Industrial Park WWTP