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首页> 外文期刊>Journal of environmental sciences >Effects of calcined aluminum salts on the advanced dewatering and solidification/stabilization of sewage sludge
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Effects of calcined aluminum salts on the advanced dewatering and solidification/stabilization of sewage sludge

机译：Effects of calcined aluminum salts on the advanced dewatering and solidification/stabilization of sewage sludge

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The high moisture content (80%) in the sewage dewatered sludge is the main obstacle to disposal and recycling. A chemical dewatering and stabilization/solidification (S/S) alternative for the sludge was developed, using calcined aluminum salts (AS) as solidifier, and CaCl_2, Na_2SO_4 and CaSO_4 as accelerators, to enhance the mechanical compressibility making the landfill operation possible. The properties of the resultant matrixes were determined in terms of moisture contents, unconfined compressive strength, products of hydration, and toxicity characteristics. The results showed that AS exhibited a moderate pozzolanic activity, and the mortar AS_0 obtained with 5% AS and 10% CaSO_4 of AS by weight presented a moisture contents below 50%-60% and a compressive strength of (51.32 ± 2.9) kPa after 5-7 days of curing time, meeting the minimum requirement for sanitary landfill. The use of CaSO_4 obviously improved the S/S performance, causing higher strength level. X-ray diffraction, scanning electron microscopy and thermogravimetry-differential scanning calorimetry investigations revealed that a large amount of hydrates (viz., gismondine and CaCO_3) were present in solidified sludge, leading to the depletion of evaporable water and the enhancement of the strength. In addition, the toxicity characteristic leaching procedure (TCLP) and horizontal vibration (HJ 557-2009) leaching test were conducted to evaluate their environmental compatibility. It was found that the solidified products conformed to the toxicity characteristic criteria in China and could be safely disposed of in a sanitary landfill.

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