How can chemical industry companies ensure the utilization rate of wastewater?
chemical industry companies need to rely on technological upgrades and system optimization to improve wastewater utilization efficiency. Let me outline a few core methods for you:
1、 Technological upgrade: Processing technology is the core
Multi effect evaporation: suitable for treating high concentration and high salt wastewater, with steam consumption 30% lower than single effect evaporation and concentration ratio 20% higher.
Biofilm method: It degrades organic matter through biological oxidation and is suitable for treating difficult to degrade wastewater containing phenols, polycyclic aromatic hydrocarbons, etc.
Preprocessing techniques:
Fenton oxidation: destroys the benzene ring structure and enhances biodegradability (B/C ratio from 0.25 to 0.45).
Stripping: Recovering volatile substances, such as methanol containing wastewater, by stripping and reinjection into electric desalination.
2、 System optimization: full process management
Water balance test: Analyze the neck of the water bottle using professional software to optimize the water usage network.
Wastewater reuse:
Direct reuse: such as reinjection of sulfur-containing waste water after stripping into electric desalination.
Regeneration and reuse: After treatment, it is used for cooling water, boiler feed water, etc.
Water saving technology:
Circulating water concentration ratio: increased from 1.5 times to 2 times, reducing wastewater discharge by 50%.
Water pinch theory: Optimizing the water network with the goal of minimizing fresh water usage.
3、 Policies and Standards: Compliance is the Bottom Line
Implementation Plan for Industrial Wastewater Recycling:
Goal: By 2025, the reuse rate of water in the petrochemical industry will exceed 94%.
Promotion techniques: electrochemical circulating water treatment, high concentration organic wastewater treatment and reuse, etc.
Standard improvement:
Develop technical guidelines for chemical wastewater reuse and technical specifications for deep reuse using double membrane method.
4、 Case reference: Technology implementation
Liyuan Environmental Protection:
By adopting the “hydrolysis acidification+modular UASB” process, the COD removal rate reached 92.8%, and the operating cost per ton of water was reduced by 0.8 yuan.
Dagang Petrochemical:
Optimizing the water network through water balance testing reduces fresh water consumption by 8% to 15%.
