Wastewater Pretreatment Challenge

Wastewater Pretreatment Challenge

Pretreatment of wastewater from coal-fired power plants in China

2019 Application Process 


This challenge is facilitated by the Global Water Tech Hub Alliance, which fosters international collaboration between regional hubs of water technology innovation.

Prospective solutions can come from entrepreneurs, university students or researchers, professionals already working in water-dependent industries, private sector and government labs or just inventive individuals. They should be proven and ready to be piloted at full scale.


Challenge finalists will present in person to the partner organization to compete for:

  • A contract to run a pilot on site in the Jiangsu province in China
  • Assuming the pilot is successful, support in implementing the solution in coal-fired power plants in China
  • Media exposure and promotion as a finalist through the Global Water Tech Hub Alliance network, including showcases at key water events


Coal-fired power plants use a limestone gypsum process to treat wastewater from the desulfurization process, which contains heavy metals, high salt and high hardness as shown in the table below. Given the very high hardness, it is necessary to do pretreatment to soften the wastewater. Currently, removing the hardness is done by adding a large amount of chemicals, resulting in high operational cost. Flow is between 120-480 tons/day, and typically 240 tons/day.

*constitution of the influx wastewater to be softened


Seeking innovative softening technology to pretreat wastewater and remove calcium hardness, in particular. There are imminent and direct market and pilot opportunities for successful applicants to this challenge.

Key success criteria for the proposal include:

  • Effectiveness of calcium removal to Ca2+ <50mg/l
  • Low/no use of chemicals
  • Reduction in operational cost
  • Proof of solution including detailed case studies including CAPEX and OPEX calculations
  • Clarity in description of how the solution will meet the specific challenges against the required specifications.


Jiangsu Water Tech Cluster


Accelerating the application of innovative water technologies around the world

Established in September 2018, the Global Water Tech Hub Alliance was set-up to foster international collaboration between regional hubs of water technology innovation. It is an open platform that helps match specific water challenges with solutions from around the world. The alliance works in two directions: supporting locally developed innovations in reaching out to foreign markets; and helping those seeking solutions to tap into a global pool of innovative technologies.


Ms. Xia (Anna) Ji
Jiangsu Water Tech Cluster, China


  • May 6, 2019
  • June 18, 2019
  • June 19 - July 31, 2019
  • August 2019
  • November 5-8, 2019
  • November 18-21, 2019

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