What important roles does the sludge cryogenic chamber dryer play in sewage treatment?

The sludge cryogenic chamber dryer plays a key role in the sewage treatment process. It realizes the comprehensive treatment of sludge reduction, harmlessness and resource utilization through the principle of low-temperature thermodynamics.

The low-temperature dryer recycles heat energy through the heat pump system to reduce the sludge moisture content from 80%~85% to 10%~20%, and greatly reduces the sludge volume. This sludge drying and reduction effect relieves the sludge storage pressure of the sewage treatment plant and reduces the land demand for subsequent disposal. Traditional high-temperature drying methods are prone to volatilization of dioxins and heavy metals, while low-temperature drying can effectively inhibit the generation and release of toxic substances. The closed design with condensation dehumidification system avoids the risk of odor overflow and dust explosion, and the exhaust gas is discharged after treatment.

Dried sludge can be used as a brick or cement additive. For example, when sludge is mixed with clay to make bricks, its spontaneous combustion characteristics can reduce fuel consumption. The calorific value of sludge particles with a moisture content of less than 10% is increased and can be mixed with coal for power generation. After treatment, the nutrients such as nitrogen, phosphorus and potassium in municipal sludge are concentrated and can be used for landscaping or farmland improvement to improve soil fertility. Compared with traditional hot air drying, low-temperature dryers use heat pump technology to recover latent heat in hot and humid air. Only 0.3-0.5 kWh of electricity is required to evaporate 1 kg of water, reducing energy consumption by 30%-60%. Some models integrate industrial waste heat as an auxiliary heat source to further reduce energy consumption.