Experimental Study on the Purification of High-Hardness Arsenic-Containing Water Using Sintered-Clay Waste Materials
Abstract
Sintered-clay waste (arising from the crushing of red and blue bricks), as the main constituent of urban construction waste, has a porous structure and water purification components: the fixed adsorbents (SiO2, MgCa-(CO3)2) and the effective purification substances (sodium aluminum silicate, potassium aluminum silicate), which provide a new adsorbent for the purification of high-hardness arsenic-containing water. Analysis of the components of sintered clay and filtered sintered clay showed that adsorption, complexation, and chemical reactions were the main purification mechanisms of high-hardness arsenic-containing water. The pore-specific surface area of the large-particle sintered-clay filter media was smaller than that of their small-particle counterparts. The experimental results showed that the process of total hardness softening included three stages: the accelerated stage, the decelerated stage, and the stable stage; the arsenic removal process consisted of three stages: the decelerated stage, the accelerated stage, and the stable stage. Both the effective purification duration of the total hardness and arsenic was 40-60 > 20-40 ≈ 10-20 mesh; the removal rates were 40-60 > 20-40 > 10-20 mesh at each purification stage, and the optimal particle size of the sintered-clay filter media was 20-40 mesh. After filtration, the amounts of components SiO2 and MgCa-(CO3)2 increased in the sintered-clay media; SiAs2 and Pb28As12S46 also appeared. The precipitates and the…
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