Economic benefits

Using carbon dioxide to comprehensively treat the alkaline wastewater of the mixing plant can save costs and increase profits for the enterprise

The price of carbon dioxide is 1.2-1.5 yuan/kg, and the comprehensive carbon dioxide consumption of the reclaimed water system is 1.12kg/m3. The cost of carbon dioxide consumed by the reclaimed water system is 1.34-1.68 yuan/m3, the equipment power consumption is about 0.3 yuan/m3, and the overall cost is 1.64-1.96 yuan/m3. The price of industrial water is 4.5-7 yuan/m3, and the median value is 5.5 yuan/m3. Treatment of sewage per cubic meter can save costs 3.54-3.86 yuan/m3.

The production of each cubic meter of concrete requires about 0.18 cubic meters of mixing water, which produces about 0.05 cubic meters of sewage. The intuitive benefit analysis assumes that the average daily production capacity of the mixing plant is 3000 m3 of concrete, which can produce 150 m3/d of sewage. Then, the cost of saving water per day after reclaimed water treatment is 531-579 yuan/d, and the cost of saving water every year is 159-173,000 yuan/y (calculated by 300d). And the higher the concrete production capacity, the more water saving costs.

When the water for washing the site and rainwater are collected into the sewage tank, the alkaline concentration of the sewage is reduced, the actual consumption of carbon dioxide is reduced, and the material cost of reclaimed water treatment is reduced. When the sewage achieves a large amount of continuous neutralization treatment, the utilization rate of carbon dioxide can be improved, so that the amount of carbon dioxide is reduced and the cost is reduced.

Social benefits

Increases revenue while saving energy and reducing emissions, reducing sewage damage to the natural environment

Carbon dioxide is one of the main gases that cause the greenhouse effect. Through the process of using carbon dioxide to neutralize alkaline sewage, carbon dioxide can be converted in the form of carbonate, and it can be recycled and reused to truly achieve "emission reduction". Play a role in promoting sustainable development. The carbon dioxide we use comes from the concentration and recovery of waste gas from chemical companies, which has a positive impact on the recycling of carbon dioxide.

As people pay more and more attention to environmental protection, safety and economic considerations, the use of carbon dioxide for alkaline wastewater neutralization treatment in mixing plants has attracted more and more attention. It can not only avoid the disadvantages of mineral acid neutralization, but also achieve Fully automated operation. This process has the advantages of safety, environmental protection, high efficiency, energy saving, economy and simple operation, and it will definitely become the trend of industry development