Concrete Washwater Recycling System

Concrete Washwater Recycling System Using Supersaturated Carbon Dioxide Reaction Solution for Neutralization

This technology is a concrete washwater recycling system consisting of a carbon dioxide supply unit, a micro-bubble generator that mixes CO2 with process water to create a supersaturated reaction solution, and a recycling treatment tank that collects and neutralizes washwater separated from surplus concrete.

Ready-mixed concrete washwater is highly alkaline, making it difficult to reuse directly, and there have been challenges in stably neutralizing it using carbon dioxide to convert it into a usable resource.

By using a micro-bubble generator to create a supersaturated carbon dioxide reaction solution that reacts with and neutralizes calcium hydroxide in the washwater, this technology allows the washwater to be recycled as mixing water for concrete production.

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Key Features:

• Carbon dioxide supply unit equipped with a flow control device for supplying carbon dioxide in a gaseous state
• Micro-bubble generator that mixes carbon dioxide with process water to dissolve it into a supersaturated carbon dioxide reaction solution and supplies it to the recycling treatment tank
• Washwater recycling treatment tank where washwater separated from surplus concrete is collected and neutralized by the supplied supersaturated reaction solution
• Agitation pumping unit that mixes and pressure-pumps carbon dioxide and process water, along with an expansion unit, a turbulent collision unit, and a micro-bubble generation unit

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This invention was developed with support from the Ministry of Education for the development of mineral carbonation techniques for construction waste using carbon dioxide micro-bubbles.

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