Abstract
To understand the features and best preparation of sludge activated carbon (SAC), and the pore structure, component, adsorption characteristics, and the yield rate of SAC, many tests have been carried out. The study illustrated that the pore structure was mostly mesopore and amorphous pore such as the ink bottle hole. In terms of different preparations to obtain SAC, the yield of SAC in sample No.1 achieved 88.09%. Using the preparation of ZnCl2 as an activator, the iodine adsorption value was significantly higher than other preparations. However, the content of quartz in sample No.1 achieved a maximum of 52.51%. Charcoal was detected in all samples except sample nos 9-12. The adsorption capacity of Cu(II) and Cd(II) reached a maximum of 600.02 mg.kg-1 and 383.2 mg.kg-1. The results showed an optimum preparation condition, which was by using the ZnCl2 as an activator, 2:1 as the impregnated ratio, 40% concentration in activator and at 400ºC reaction temperature could create rich pore structure and charcoal inside.
Highlights
A number of problems in sewage treatment plants directly appear in real life such as continual increasing cost, sewage, sludge, and the low rate of resource utilization
The sludge was fresh from the Hanxi sewage treatment plant in Wuhan, Hubei Province, and the sludge used in the test was after the removal of water
The treated sludge was sieved through a 1 mm sieve, and the reaction condition was set for different impregnation ratios, different temperatures, and different activation concentrations
Summary
A number of problems in sewage treatment plants directly appear in real life such as continual increasing cost, sewage, sludge, and the low rate of resource utilization. Li et al (2012) found it was highly effective to prepare sludge activated carbon using ZnCl2 as an activator with rational concentration (45%), and with the reaction temperature set at (600°C), the immersed temperature set at (45°C), and the reaction time being(50 mins). He discovered that sludge activated carbon (SAC) had the adsorption ability to remove heavy metal ions as well.
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