Advances in Water Treatment and Enviromental Management

DEVELOPMENT OF AERATED FILTER PACKAGE PLANT 83Table IIILoad Variation Period 2Filter NumberNote: HLR : Hydraulic loading rate (m/h)HRT : Hydraulic retention time (based on 50% voidage) (min)VLR : Volumetric loading rate kg/m 3 media. d5. PACKAGE PLANT DESIGNUsing the data from the pilot plant evaluation a large scale package aeratedfilter plant was designed and installed at Chesham sewage treatment works.The plant was based on prefabricated relocatable steel containers fortreatment, washwater storage and pumping, plant control, and processand backwash air supply.The overall dimensions of each module were governed by the constraintsimposed by transport to site however, an increase in treatment capacity ispossible simply by increasing the number of treatment units as required.The treatment module comprises an aerated treatment section, high ratedownflow polishing filter and integral pipework and instrument housing. Aschematic is shown in Fig.4.