Abstract: Sludge adsorbent was prepared from oily sludge and walnut shell and applied in the treatment of oily sewage and the adsorption of industrial oils. The results showed that the carbon content of sludge adsorbent was 87.69% with a loose surface texture and well-developed pores. The pore structure mainly consisted of mesopore. Under the same conditions, the treatment effect of sludge adsorbent on oil in oily wastewater was better than that of activated carbon significantly, the treatment effect of sludge adsorbent after regeneration by heat treatment on oily wastewater was slightly lower than that of new agent, but it was still superior to activated carbon that was also heat regenerated; The initial instantaneous adsorption rate of sludge adsorbent applied to industrial oils was higher than that of activated carbon. The initial instantaneous adsorption rate of sludge adsorbent after heat regeneration was improved, better than that of new agent. With the increase of regeneration times, the initial instantaneous adsorption rate increased continuously; the saturated adsorption capacity of sludge adsorbent regenerated by heat treatment for industrial oils was always higher than that of activated carbon regenerated, and the time for reaching saturated adsorption was faster, and the sludge adsorbent can maintain a stable adsorption capacity for industrial oils after repeated regeneration.

Key words: sludge adsorbent, oily sludge, oily wastewater, industrial oils