The Beneficial Effects of Wastewater Recycling and Utilization in Mixing Plants

With the rapid development of China's economy, conserving resources, protecting the environment, and maintaining sustainable social development are increasingly receiving attention from the whole society. For a long time, concrete mixing plants have generated a large amount of slurry and waste every day, and the wastewater generated from the cleaning of concrete mixing equipment and transportation equipment has always been a headache for concrete production enterprises. Therefore, the reasonable recycling and utilization of wastewater has significant economic and social environmental benefits.

After washing mixers and transport vehicles, concrete enterprises will generate a large amount of wastewater, which contains impurities and admixtures brought in by cement, aggregates, and aggregates. The water used to clean cement slurry or concrete is highly alkaline, with a pH value of up to 12. Random discharge can pollute the environment. Therefore, the resource utilization of solid waste and wastewater from mixing plants has always been highly valued by people, and the most effective way of resource utilization of wastewater from mixing plants is to mix the precipitated and clear wastewater with tap water in a certain proportion before using it as concrete mixing water.

1. The addition of wastewater has a relatively small impact on the setting time of cement. As the slurry concentration increases, the workability of concrete gradually deteriorates. Compared to tap water, wastewater has a greater impact on the loss of concrete's slump over time.

2. Wastewater to a certain extent enhances the compressive strength of concrete, which is beneficial for the strength development of specimens. When using wastewater to prepare low-grade concrete, its early strength is low, but its later strength develops well. When preparing high-grade concrete with wastewater, the alkaline environment and the filling effect of small particles are conducive to the development of concrete strength.

3. Wastewater is also beneficial for the impermeability of concrete, and a higher proportion of mineral admixtures in the alkaline environment of wastewater is conducive to secondary hydration, enhancing the compactness of concrete.

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