Demulsifier for Tunnel Sewage

Tunnel sewage usually contains various pollutants, and there may be emulsions formed by oil substances and water, such as oily wastewater generated by mechanical equipment during the construction process, oil spills from vehicles, etc. These emulsions will increase the difficulty of sewage treatment and affect the treatment effect. Therefore, a demulsifier needs to be used for treatment. The demulsifier can effectively destroy the oil-water emulsion system in the wastewater, causing tiny oil droplets to aggregate into larger ones, thus promoting the rapid separation of oil and water. This is crucial for treating the oily components in tunnel sewage and can significantly reduce the oil content in the wastewater. Using a demulsifier can effectively reduce the content of pollutants such as chemical oxygen demand (COD), chromaticity, heavy metals, and total phosphorus in the sewage, improve the water quality, and meet the recycling standards.

The demulsifier for tunnel sewage is an organic polymer that can improve the interfacial tension of the oil-in-water system, neutralize the negative charges in the oily wastewater, and promote the separation and aggregation of emulsified oil from the water, achieving the effects of demulsification and flocculation. This type of demulsifier has a fast oil-water separation speed, can be used at room temperature, can reduce suspended solids, and decrease the subsequent sludge treatment volume. It has an obvious demulsification effect on emulsified oily wastewater containing surfactants.

The demulsifier reacts quickly and can directly treat high-concentration emulsion wastewater. In order to ensure a complete reaction, aeration or coagulation stirring is required. Since the concentration of the sewage varies, the dosage of the demulsifier should be determined according to the suspended substances in the emulsion wastewater. As the dosage of the demulsifier gradually increases, the demulsification effect will gradually improve, achieving clear water quality.

Due to the differences in the components and concentrations of the sewage, the dosage will also vary. For tunnel sewage, the appropriate demulsifier and dosage should be selected according to its specific components and pollution degree.