Coated particles, process for production thereof, cation adsorbents, and water treatment system

Abstract

The invention relates to coated particles, a process for production thereof, cation adsorbents, and water treatment system with the same. The coated particle of the invention are either particles obtained by surface-coating core resin particles with a surfacing resin having cation-adsorptive and -desorptive functional groups which are characterized in that the core resin particles are made of a thermoplastic resin and have a specific surface area of 50 to 6,000cm / cm and the quantity of the surfacing resin is 10 to 300wt% based on the core resin particles or particles obtained by surface-coating core resin particles with a surfacing resin having cation-adsorptive and -desorptive functional groups which are characterized in that the core resin particles are made of a thermoplastic resin and have nearly spherical shapes having diameters of 10 to 1,200[mu]m and the quantity of the surfacing resin is 10 to 300wt% based on the core resin particles. Thus, the invention provides cation adsorbents which exhibit high adsorption rates against cations such as ammonium ions or metal ions contained in raw water, high rates of regeneration of themselves, and high cation adsorbability as well as a small-sized water treatment system.

Description

technical field [0001] The present invention relates to coated fine particles having a cation exchange function usable for water treatment of well water, river water, etc., a method for producing the same, a cation adsorbent, and a water treatment system using the same. Background technique [0002] In recent years, in rivers and lakes, due to the increase in the inflow of industrial wastewater and domestic wastewater due to the increase in population, the content of nitrogen compounds such as ammonia has increased, and the quality of raw water for water supply has deteriorated. In addition, groundwater is also affected by long-term paddy field fertilizers or underground infiltration sewage treatment. In feed water that uses drawn water as raw water, the content of nitrogen oxides such as ammonia increases and changes over time. In order to supply such raw water as feed water, it is necessary to reduce the content of nitrogen compounds such as ammonia to below a reference va...

AI Technical Summary

Problems solved by technology

However, when the treatment capacity of nitrogen compounds in the primary treatment process increases, excessive chlorine may be injected when the treatment amount of nitrogen compounds in the secondary treatment process increases.

In addition, when excessive chlorine is added in the secondary treatment process, there are problems such as chlorine odor hazards or carcinogenic substances such as trihalomethanes.

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