Abstract
The advanced treatment of condensate water is important for efficient reuse of water resources, especially in confined space. In this work, a novel integrated process of ion exchange resins and activated carbon is proposed to remove various pollutants in condensate water. A fixed bed column of pre-treated basic anion exchange resin, acidic cation exchange resin, mixed ion exchange resins and modified activated carbon was applied to remove ionic pollutants, organic pollutants and adjust the pH value of output water. The effects of the types, amount ratios and the sequence of ion exchange resins were investigated using two types of condensate water. The results showed that the output water of the fixed bed column had an average TOC of 30~70 ppm, conductivity under 5 μS/cm, pH value of 5~8, which could meet the requirements of sanitary water. The saturated adsorption capacities of the basic anion exchange resin and the acidic cation exchange resin were calculated to be 0.87 mol/L and 1.82 mol/L, respectively. Under the actual operating conditions, continuous dynamic test was carried out over a condensate water treatment module consisting of two adsorption columns and four exchange columns to evaluate its real service life.
Highlights
Condensate water is generated from a variety of sources in our daily life, including air conditioning system, food plant, chemical plant, greenhouse production, and some particular environments such as hermetic area [1,2]
A novel integrated process of ion exchange resins and activated carbon is proposed for the advanced treatment of condensate water
Under the actual operating conditions, the continuous dynamic test was carried out on a condensate water treatment module consisting of two adsorption columns and four exchange columns to evaluate its real service life
Summary
Condensate water is generated from a variety of sources in our daily life, including air conditioning system, food plant, chemical plant, greenhouse production, and some particular environments such as hermetic area [1,2]. Most of the existing processes or techniques are difficult to meet the needs of condensate water treatment in confined space, due to their disadvantages of high energy consumption, low purification efficiency, residual waste generation, high maintenance costs and limited processing capacity. The ion exchange method has the advantages of simple operation, high adsorption speed, less pollution, low energy consumption and high purity of output water [11], the application of traditional ion exchange method has been limited because of its low adsorption capacity and the leaching of the functional groups. It is necessary to improve the adsorption capacity as well as the stability of ion exchange resins, while its combination with other efficient absorbents is promising to be used for condensate water treatment. Under the actual operating conditions, the continuous dynamic test was carried out on a condensate water treatment module consisting of two adsorption columns and four exchange columns to evaluate its real service life
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