5+sewage+systems船用生活污水处理系统

《5+sewage+systems船用生活污水处理系统》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、TheHazardsandregulationsregardingtheSewageSystemsRawsewagedischargedintorestrictedwaterswilleventuallyoverwhelmtheselfpurificationabilityofthelimitedquantityofwater.InacloseddocktheeffectcanbeseeninablacksludgywaterwhichwhendisturbedgivesoffanunpleasantsmellpossiblyHydrogenSulphide.Whenthequantityo

2、fsludgeisreasonableaerobicbacteriadigestthesewagebreakingitdowntosimplecompoundsandCarbondioxideusingupOxygenintheprocess.ThesecompoundsandCarbondioxidepromoteplantlifewhichreturnsoxygentothewater.WhenthequantityofOxygenbecomessodepletedthattheaerobicbacteriacannolongerfunction,anaerobicorbacterian

3、otrequiringOxygentofunctionwilltakeover.Thebreakdownofthesludgeisthenassociatedwiththesameprocessofdecaywithfoulsmellinganddangerousgassesbeingproduced.Thereforetheprincipalmeansofsludgeconditioningonboardisthatofaerobicaction,TypesofsewagedisposalTherearefourmaintypesofsewagedisposalsystemsfittedt

4、oships;a.Dischargefromthetoiletbowlintoacommondrainleadingtooverboardviastormvalvesb.Asaboveexceptcommondrainleadstoastoragetankwithorwithoutaeration.Contentsdischargedashoreoratseawhenappropriate.c.Sewagetreatmentsystemswithsewagebeingcollectedandtreatedtoproduceaneffluentsuitabletodischargewithou

5、teffectonenvironment.d.Vacuumcollectingsystemwherethedrainsarekeptataslightlynegativeabsolutepressure,onflushingwater,sewageandairaredrawnintothedrainsbeingledtoacollectingortreatmenttankwhichiskeptatatmosphericpressure.AerobicandanaerobicbacterialactionWhenthesewageentersthedrainagesystemitisacted

6、uponbyaerobicbacteriaandisbrokendown,duringthisprocessthenaturallyoccurringAerobicBacteriastripthewaterofoxygenandproduce;morewater,CarbonDioxide,andmorebacteria.If,however,thereisinsufficientoxygenforthesebacteriathenalternativebacteriadominates.TheseAnaerobicBacteriaproduceHydrogenSulphide,Methan

7、eandAmmonia.Thesegassesareeitherhighlytoxicorflammableorboth.InparticularHydrogenSulphideistoxictohumansinconcentrationsdownto10ppmanditsflammablevapoursareheavierthanairsomaybuildupinlethalpocketsinenclose