7、arenotprimarysettlingtanksandsludgereturnfacilitiesthatareinstalledintraditionalprocess. ThewastewatertreatmentplantoftheShijlaZhuangEconomicZoneisthefirstplantusingUNITANK®inChinaexceptMarco.Itcantreat100,000cubicmetersmunicipalwastewatereverydayandis7.2haarea. The