The physical and chemical properties and application in foreign countries of sludge-based adsorbent

Adsorbent can be produced from sludge.The paper mainly introduces the composition of sludge,the physical and chemical properties of sludge-base adsorbent under different preparation conditions and present situation of study and application of the adsorbent in liquid phase adsorption.Using alkali metal hydroxide reagents,especially KOH,is found to be the most effective technique for producing sludge-based adsorbents with high BET surface area.Carbonisation and physical activation,on the other hand,do not yield high surface areas.The surface pH of the sludge-based adsorbent has been shown on be controllable through the selection and manipulation of the activation regime.Carbonisation is an effective means of producing highly alkaline adsorbents.The sludge-based adsorbent had been widely used in liquid phase adsorption,which could remove metal ions,dyes,phenolic compounds effectively.The sludge-based adsorbent shows a broad application prospect in sludge treatment and provides a new way for sludge utilization as a resource in China.