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The ultrasonic pretreatment of activated sludge was conducted and followed by the anoxic-aerobic digestion in this study. First, an experimental program of orthogonal design was carried out to determine the most effective pretreatment conditions. The results have showed that the optimal pretreatment conditions were the ultrasonic frequency of 28 kHz, ultrasonic density of 0.15 W/mL and ultrasonic...
Most of the metal-based phases formed in the process of sludge incineration are toxic and their emissions need to be strictly controlled. The sludge incineration tests using tubular furnace were carried out to study the distribution of heavy metals under different operating conditions. The emphasis has been on the study of the behavior of the potentially most harmful metals present in the sludge in...
The removal of heavy metal ions(HMI) contained in the electroplating wastewater by precipitation flotation was studied. Experimental results show that chromium, copper, nickel and other heavy metals can be removed efficiently, and all the water quality indexes were up to the first grade of wastewater discharge standard (GB21900-2008) when the dosage of Na2S (CNa2S:CMe=1.6) and pH7.5-8.5. The percentage...
It is necessary to clarify the combustion process of industrial sludge in order to utilize it efficiently as an energy source. In this paper the influences of three catalysts (K2CO3, NaCl and Al2O3) on the ignition and burn off characteristics of industrial sludge had been investigated by simultaneous thermogravimetric analysis (TGA) with linearly increasing temperature at air atmosphere. The results...
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