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奇文奉,李盛鎬,金秀生 동아대학교 환경문제연구소 1987 硏究報告 Vol.10 No.1
For the purpose of treating the sludge which contains hazardous heavy metals, various kinds of studies were made on the unconfined compressive strength which various with the ratio of portland cement. Aluminum sulfate and sodium silicate, the effects upon cements binding influenced by moisture content, volatile solid and pH of sludge, and the amount of leaching solution which comes after cement binding. Erief results from the said studies are as following; 1. As a result of compression tests at various mixing ratio of binders, the highest intensity was found at the ratio of portland cement(0.4) + aluminum sulfate(0.05) + sodium silicate(0.05) + sludge(0.5). Generally the compressive strength tends to be in direct proportion with period of curing. 2. In case that sludge was binded at the same mixing ratio of binders to sludge, the compressive strength was increased and the amount of leaching solution was decreased at low content of moisture and volatile solid and high pH of sludge. 3. while the compressive strength is over than 9.0㎏/㎠, the hazardous heavy metals are not leached from the brick. 4. As the C/S ratio of binders was increasing, the amount of leaching hazardous heavy metals was decreasing. When binders were mixed at the ratio;portland cement+Aluminum sulfate(0.1)+Sodium silicate(0.1) and the C/S ratio of binders were 0.5, leaching solution amount was minimum. 5. The compressive strength of the sludge in the moisture content of 70% to 75% is made of over than 10㎏/㎠ at the curing of 28 days. When binders were mixed at the ratio; portland cement were over 0.5 of the C/S ratio, portland cement+Aluminum sulfate(0.1) were over 0.35 of the C/S ratio, portland cement+Sodium silicate(0.1) were over 0.35 of the C/S ratio and portland cement+Aluminum sulfate(0.05)+Sodium silicate(0.05) were over 0.25 of the C/S ratio.