Abstract
As a kind of extensive sources and low cost industrial waste, fly ash has many features, such as porosity, large surface area, adsorption capacity, chemical activity and weakly alkaline, which seem a wide prospect of application in wastewater treatment. This study proposed the acid modification test on fly ash. The effect of key factors including the particle size, pH, the dosage of fly ash, adsorption time and dosage of the modifier on domestic sewage removal efficiencies were evaluated. The optimum conditions and the corresponding removal efficiency were determined. The results show that the removal efficiency is increased firstly and steady subsequently with the increase of fly ash dosage, increased firstly and decreased subsequently with the increase of adsorption time, and increased firstly and decreased subsequently with the increase of pH value. The removal efficiency can up to 95.19% when 0.7 g fly ash added in 200 mL wastewater when the pH value was adjusted to 5 at the adsorption time of 20 min. And the best particle size of fly ash is 200 meshes, when used 2mol/L hydrochloride as modifier and soaked fly ash for 2h, and the ratio of hydrochloride and fly ash is 1mL / g, the effect is best. It also finds obviously that fly ash can have a better effect on removal efficiency than raw fly ash.
Highlights
Adsorption is an important method to process contaminant which is harmful and difficult to degrade in waster water and air [1,2,3]
Screen fly ash taken from coal-fired power plant through 60, 100 and 200 target sets orderly to obtain different particle sizes
The removal rate (ȝ) of domestic sewage was determined by spectrophotometer, and the absorbance of domestic sewage was measured before and after treatment
Summary
Adsorption is an important method to process contaminant which is harmful and difficult to degrade in waster water and air [1,2,3]. For the large number of properties of silica, alumina and other components, the application range and application of fly ash are limited, the surface or structure of the surface or structure should be modified, so that it can be enhanced [10,11]. It is one of the main ways to explore the utilization of fly ash in the treatment of waste water and waste gas by using fly ash. This study provides a new method for the treatment of domestic wastewater
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