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INTRODUCTION1,4connected2-acetylamino-2-deoxide--D-glucose,commonlyknownaschitin(chemicalformulaC8H13NO5)withmolarweightof203.19,existsaswhiteorpaleyellowplatesintheindustrialpureproduct.Apolyosewithnaturalamountnexttothatofcelluloseontheearth,itcanbefoundininsects,crustsofcrustacean,andthecellwalloffungi.Ithassteadychemicalpropertyandnotox-icity;andcanbebiodegradedbylysozyme,indi-catinggoodbio-affinity.However,itcanonlybedissolvedinhydrochloricacid,sulfuricacid,aceticacid,and78%-97%phos… 相似文献
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INTRODUCTIONAfterthedepositionofMunicipalSolidWaste(MSW) ,thebiodegradableorganicfractionun dergoesaseriesofchemicalandbiochemicaldegradation .Basedontheanalysisoftheemit tedgases,fivedistinctphasesofthelandfillanaerobicdegradationprocess,(i.e.,initialadj… 相似文献
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The technique of micro-electrolysis-contact oxidization was exploited to treat chitin-producing wastewater. Results showed that Fe-C micro-electrolysis can remove about 30% CODcr, raise pH from 0.7 to 5.5. The CODcr removal efficiency by biochemical process can be more than 80%. During a half year's operation, the whole system worked very stably and had good results, as proved by the fact that every quality indicator of effluent met the expected discharge standards; which means that chitin wastewater can be treated by the technique of micro-electrolysis, contact oxidization. 相似文献
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Methane (CH4) is an important greenhouse gas and a major environmental pollutant, second only to carbon dioxide (CO2) in its contribution to potential global warming. In many cases, methane emission from landfills otherwise emitted to the atmosphere can be removed and utilized, or significantly reduced in quantity by using cost-effective management methods. The gas can also be used as a residential, commercial, or industrial fuel. Therefore, emission reduction strategies have the potential to become low cost, or even profitable. The annual growth rate of Municipal Solid Waste (MSW) output in China is 6.24%, with the highest levels found in South China, Southwest China and East China. Cities and towns are developing quickly in these regions. MSW output was only 76.36 Mt in 1991 and increased to 109.82 Mt in 1997, registering an average increase of 43.8%. In China, methane emission from landfills also increased from 5.88 Mt in 1991 to 8.46 Mt in 1997; so the recovery of methane from landfills is a profitable project. 相似文献
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