Catalytic adsorbents obtained from municipal sludges, industrial sludges, compost and tobacco waste and process for their production

摘要

Industrial waste derived adsorbents were obtained by pyrolysis of sewage sludge, metal sludge, waste oil sludge and tobacco waste in some combination. The materials were used as media to remove hydrogen sulfide at room temperature in the presence of moisture. The initial and exhausted adsorbents after the breakthrough tests were characterized using sorption of nitrogen, thermal analysis, XRD, ICP, and surface pH measurements. Mixing tobacco and sludges result in a strong synergy enhancing the catalytic properties of adsorbents. During pyrolysis new mineral phases are formed as a result of solid state reaction between the components of the sludges. High temperature of pyrolysis is beneficial for the adsorbents due to the enhanced activation of carbonaceous phase and chemical stabilization of inorganic phase. Samples obtained at low temperature are sensitive to water, which deactivates their catalytic centers.

主权项

1. An adsorbent formed by drying waste materials, wherein the improvement comprising:
a) a waste material composition, comprising:
(i) one of compost or compost materials and sludge;
(1) wherein the compost is one of tobacco waste, waste paper, wood char or a combination thereof;(2) wherein the sludge is at least one of waste oil, metal, or municipal sludge;(ii) 20-30% porous organic carbon with incorporated organic nitrogen species; and(iii) 70-80% inorganic matter; b) adsorbent characteristics, wherein;
(i) the adsorbent is capable of adsorbing up to about 30% of the adsorbent's weight in hydrogen sulfide;(ii) a surface area of the adsorbent is 10-200 m2/g; and(iii) the pH of the adsorbent is between 7-12.