Hanqi Environment has successfully delivered two core technologies—High-Efficiency Hardness Removal and Carbon-Enhanced Clarification—for the Lianyungang Petrochemical Park reclaimed water project in Jiangsu. As one of China's seven major national petrochemical bases, this project treats challenging industrial wastewater, including cooling tower blowdown and reverse osmosis (RO) concentrate, which are characterized by high hardness and low biodegradability.

Project Scale:

• Low-concentration wastewater: 80,000 m³/day

• High-concentration wastewater: 20,000 m³/day

• RO concentrate treatment: 30,000 m³/day

  
  

Core Technologies:

1. High-Efficiency Hardness Removal

   • Designed for cooling tower blowdown and RO concentrate with incoming total hardness exceeding 1,000 mg/L.

   • Prevents scaling and fouling in downstream membrane systems through optimized hydraulic distribution and sedimentation.

   • Features anti-scaling measures, extended cleaning intervals, and an automatic backwashing system for sloped tubes to reduce maintenance.

   • Achieves stable effluent hardness below 140 mg/L, ensuring reliable downstream membrane operation.

2. Carbon-Enhanced Clarification 

   • Treats RO concentrate after biological oxidation, which has poor biodegradability and residual soluble organics.

   • Integrates adsorption, coagulation, clarification, and carbon circulation in a single unit, using hydraulic mixing for powdered activated carbon (PAC) separation and reuse.

   • Further reduces COD to below 25 mg/L, serving as the final polishing step to meet discharge standards.

Operational Benefits:

• The Hardness Removal system significantly reduces chemical sludge compared to conventional methods, lowers disposal costs, and extends cleaning intervals—addressing common issues of frequent scaling and high maintenance.

• The Carbon-Enhanced Clarification system minimizes PAC consumption and reduces energy use through hydraulic optimization and carbon recycling.

  
  

This project demonstrates that through refined hydraulic design and structural innovation, industrial wastewater treatment can be both simplified and made highly efficient. The successful delivery of these two core technologies provides reliable support for water recycling in this key national petrochemical hub.