Question

Name: ID: 2. The activated sludge process can be used to remove organic carbon (BOD) and nitrogen species (ammonia, nitrite and nitrate) from wastewater. The schematic below is a of the 4-stage Bardenpho process that can achieve low levels of ammonia and nitrate in the final effluent). Please describe how BOD and nitrogen species concentrations evolve in each stage, include what the return activated sludge, the internal mixed liquor return, and the methanol injection are used for. "nitrite does not normally accumulate in the process, as it is converted in nitrate as soon as it is formed) Internal Mixed Liquor Return Methanol y Clarifier 0.5 Aerobic Post-Aerobic Returned Activated Sludge Waste Activated Sludge

Answer 1

Solution Based on abeve the feuol steps details as ave 2 tEnch paineess plig foll oues ( PRE ANOxic STAGE AEROBIC Fist Ni tori fication Stege 2 3toye Post AeotobicRe- Aesation stoge Post Amoxic (1) PRE ANOXIC STAGE Nitaate ich mixed liaua fom the Secod slage leactoois mixed coith influent caste teteor in he abse nce of en

Bazterio tilize the BoD in The in fluent Teducing the ak to gaseaus mtagen atmesphee chich is le leaded m Appoiox d of the imfluent mtegen e meved cth in this loge LS AEROBIC/ ARST NITRIFICATION STAGE is intoreducedto oxidired the en and ammonia BoD Conveleto new Cell mass and Co BoD is Convesited te ntaite, then niteate POST ANOXIe STAGE leeycled te stage m the obsence of aia ohere it is x Nitoate not intooduc 1 is educed to nitagen gas ond released to he almesphese

designed to poreduce lowefflent lage mitoa te Gncentsaton is This RE-AERAT|ON STAGE (4 POST AE RO BiC Subjectng the easte to leaCuolion intooduces adtioal 0ygen to he mized that it lemains aesobic for Lielueo Ensusy im predSeting lthin the final clooi fie actire The activated sludye Cotains hig hdy micolo The se misobes when Comes in Contact coith se woge stat 02i dising the oganie maltea he ameuit of denita icalion the mixed liauos aztuan Contatolled the Supplemental Caobon thenal is use me as Souoice n the denitai ficaton