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Manufacturing Water Permeable Block Using Loess, Clay and Waste Sewage Sludge

황토, 점토 및 하수처리오니를 이용한 투수블록 제조

  • Received : 2015.07.16
  • Accepted : 2015.09.01
  • Published : 2015.09.30

Abstract

Water permeable block was manufactured using waste sewage sludge, loess and clay for the purpose of recycling waste sludge due to the prohibition of waste sludge ocean dumping. Experiments for determining optimum mixing ratio was conducted by changing sludge content in water permeable block as 5~20%. In respect of compressive strength, $1,600N/cm^2$ ($163.3kg/cm^2$) was obtained when the mixing ratio of sludge : loess : clay were maintained by 5% : 65% : 30%, 10% : 65% : 25% and 15% : 65% : 20%, respectively. These mean that relatively high compressive strength can be obtained when the sludge content is maintained 5, 10, 15% at the 65% of loess content. In terms of water permeability and absorption rate, the higher values can be obtained as the sludge content increases. The optimum mixing ratio of sludge : loess : clay came out to be 15% : 65% : 20% when water permeability, absorption and strength were considered altogether, which matches the result observed by an electron microscope. The heavy metal leaching test result of the prepared permeable block appeared to satisfy the environmental standard in the content of Cd, Cu, Pb and As.

Keywords

Clay;Loess;Waste sewage sludge;Water permeable block

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Acknowledgement

Supported by : 중소기업청