Experimental study on the mechanism and efficiency of a closed-cycle low-temperature evaporation system for treating high salt and high organic matter wastewater
JOURNAL OF WATER PROCESS ENGINEERING(2024)
摘要
With the rapid development of the economy and the increasingly strict environmental regulations, the treatment of high-salt and high-organic wastewater has received increasing attention. The development of a technology that can effectively treat high salt and high organic wastewater is necessary. In this paper, the mechanism and efficiency of a closed-cycle low-temperature evaporation system for treating high-salt high-organic wastewater were investigated. The system consists of a humidifier, two dehumidifiers and a heat pump unit. The operation mechanism and efficiency of the system were investigated using a laboratory configuration of high salt and high organic wastewater as the treatment target. The system performance was affected by two main operating parameters: (a) the increase in wastewater flow increased the productivity and GOR by 6.9 % and 4.1 %, respectively; and (b) the increase in airflow improved the heat transfer efficiency of the humidifier and the twostage dehumidifier, which resulted in a significant improvement in the system performance, with an increase in productivity by 4.8 % and 4.9 %, respectively. The closed-cycle low-temperature evaporation system achieved 99.99 % and 100 % removal of the total dissolved solids (TDS) and chemical oxygen demand (COD) from wastewater, respectively. This system provides a new idea and method for the treatment of high salt and high organic matter wastewater, which has important theoretical and engineering application value.
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关键词
Closed-cycle,High-salt and high-organic wastewater,Humidification -dehumidification,Efficacy and mechanism
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