Microwave treatment of industrial sludge
    Industrial sludge containing solid debris is an oil and water emulsion , oil sludge produced globally each year dozens of tons, the conventional treatment process are: heating demulsification - centrifuge - landfill . Often used when the heating breaking breaking additive , so the resulting residue is difficult to handle , is required after deoiled residue landfill capacity, high cost of landfill . U.S. DA Purta et al. Developed oil mill sludge de-oiling microwave technology, which is the oil and metal sludge mixed with additives , and then in a flow system to microwave irradiation 10 min, finally by centrifugation , separation the solid material ( mainly Fe, FeOx), oil and water. The solid separated can be re- used for making raw materials , oil can be used as fuel sold. Studies show that the microwave demulsification deoiled the processing speed than the conventional 30 times faster de- oil system , the processing system can save 90% of the volume , greatly reducing the need for landfill
Treatment of solid waste , reducing landfill costs , the use of microwave de-oiling process the mill sludge treatment costs than conventional treatment methods is reduced by 10 -fold.
    Wang Jun , Liu Kanghuai such as the use of microwave heating monosodium glutamate factory in Nanning sludge dewatering test results showed that after 50 s after microwave heating , sludge filtration rate can reach 35 mL / h, while the use of heated water bath , the temperature rise high to 60 ℃ to reach the filtration rate 35 mL / h; and the use of microwave heating as long as the temperature of the sludge reaches 70 ℃ on the water bath heated to 80 ℃ close to the filtering effect . In addition, sewage treatment plant sludge as a raw material , the use of activated sludge can be prepared by microwave irradiation . FOREST et al [ 7 ] the sewage treatment plant and two primary settling tank sludge drying settling tank mixed with phosphoric acid activation, then using 400 W microwave irradiation 260 s, successfully produced sludge activated carbon, the iodine value of the activated carbon 517. 4 mg / g. Using the resulting activated sludge wastewater treatment TNT , slightly higher treatment efficiency activated powdered product .