農(nóng)田污水灌溉的風險分析研究.pdf

1、河海大學碩士學位論文農(nóng)田污水灌溉的風險分析研究姓名：李洪良申請學位級別：碩士專業(yè)：農(nóng)業(yè)生物環(huán)境與能源工程指導教師：邵孝侯20070301AbstractAbstractWiththefastdevelopmentofnationaleconomyandtheenhancingofpeople’SlivingstandardinChina，theirrigationwaterforfarmlandiscontinualoccupiedby

2、industrialandurbanwaterconsumption，causingwatershortageforagricultureseveritydaybyday；Meanwhile，withaggravationoftheamountsofindustrialanddomesticsewage，causingthewaterqualityofeachlargewaterareathroughoutthecountrypollu

3、ted，agriculturehasbeenbadlychallengedbywatershortduetowaterqualityTherefore，wehavetouselargeamountofsewagetoirrigatefarmlandinagriculture，anditcanbeforecastthattheareasofsewageirrigationareincreasingneducingforalongtimeA

4、lthoughsewageirrigationCanofferwaterandnutrientresources，inChinabecauseofthelowhandlingcapacityforsewage、thelargedisposalcostofsewageandtheweakawarenessofenvironmentalprotectionforpeople，whichirrigatedfarmlandwithlargeam

5、ountofnohandlingorlackingnecessarypreprocessingsewage，thewaterqualityexceedsstandardsseriouslyBlindsewageirrigationhascausedtheaccumulationofpoisonousandharmfulsubstanceinsomeregionalsoilsandwatersources，andenvironmentha

6、salsobeenpollutedinvaryingdegrees，SOthatithasthreatedpeoplehealthseriouslyinsomeregionBasedonplentifulliteraturereviews，theauthorreviewsthecurrentsituationofsewageirrigationanditsriskanalysis，andpointstemainingproblemsin

7、currentriskanalysisofsewageirrigation；carryingriskidentificationonsewageirrigationcausingdiverserisksbyusingAHPtheninaccordancewiththeweightofrisks，selectingandrankingthem，ascertainingthattheresearchobjectsaresoil—crop、s

8、urfacewater、peoplehealthandgroundwater；pointingoutevaluationindicatorsofsoilcrop、surfacewater、peoplehealthandgroundwater，whichshowthedegreeofsewageirrigationpollutionandthenpresentingthecalculationmethodfordegreeofsewage

9、irdgationtotalriskbygenerallingevaluationindicatorsofdiverserisks；researchingontheprobabilitydistributionofsewageirrigationrisks，withnonparametersinspection，andgettingthedistributionfunctionandcharacteristicsofsewageirri

10、gationrisksBasedonthetheoryresearch，thispapermakesriskanalysisofsewageirrigationinsomesewageirrigationarea，regionofNanJingcityusingthepracticaldataoftheplaceBasedonaboveworks，thepaperresearchesfurtherondegreeofacceptable

11、riskforcontaminationinirrigationarea、theageofsafetyforsewageirrigationandutilizesthepredictingofwaterqualitybasedonfuzzyMarkovchainmodelwithweightstoforecastthesurfacecomprehensivewaterqualityFinallythispaperputsforwardf