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A collection of questions and answers related to wastewater treatment, covering topics such as sludge characteristics, treatment processes, and regulatory requirements. It is a valuable resource for students and professionals in the field of environmental engineering, particularly those studying wastewater treatment operations.
Typology: Exams
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Percent of volatile solids normally in sludge - correct answer. 70-80% D.O. levels in a primary clarifier - correct answer. 0.5-1.0 MG/L Why are precautionary measures needed around an aeration basin? - correct answer. undertow and turbulence O.S.H.A. approved trench - correct answer.greater than the width; the width must be less than 15 feet narrow excavation in which the depth is
What causes bulking? - correct answer. 1. Excessive hydraulic loading,
When and where are monthly reports submitted? - correct answer. by the 20th of the following month; submitted to Austin How and when do you report a bypass? - correct answer. as soon as possible by phone within 24 hours; followed by in writing within 5 working days What are the 5 events of stream purification? - correct answer. 1. Pollution
What is needed for good communication? - correct answer. good listening How much chlorine gas comes from one part liquid chlorine? - correct answer. 450 What does the "F and M" stand for in the F:M Ratio? - correct answer. Food to Microorganism What feeds the nitrification organisms? - correct answer. fatty volatile acids An explosive atmosphere contains what 2 things? - correct answer. 1. Oxygen
what are the considerations for writing a permit? - correct answer. impact on receiving stream What is an adequate B.O.D. for the contact stabilization ponds best function? - correct answer. at least 35 lbs/acer/day what is fecal coliform measured in? - correct answer. a geometric mean how should the bell end of a pipe be laid? - correct answer. uphill what 5 types of pipe are commonly used in collection systems? - correct answer. 1. PVC
what is the formula for S.V.I.? - correct answer. 30 minute settled sludge volume in ML/L, times 1000, divided by the M.L.S.S. concentration in MG/L x 1000 What are the 3 different cycles of decay? - correct answer. 1. nitrogen
what dshould dstorm dsewers donly dcarry? d- d dcorrect danswer. d d drainwater How danswer. dmany d d d 9 dfeet dfeet dshould dwater dand dsewer dlines dbe dkept dapart din dall ddirections? d- d dcorrect
what dis dthe dmain dpurpose dof dsewage dtreatment? d- d dcorrect danswer. d d dto dstabilize dand ddispose dof dorganic dmaterial what dis dthe dbest dway dto dhook dup dpotable dwater dto dthe dpacking dgland don da dpump? d- d dcorrect danswer. d d dby dan dair dgap dor dnot dat dall what dis dthe dmost dimportant dthing dprotected dby dpretreatment? d- d dcorrect danswer. d d demployees what dare dthe d 3 dexceptions dto dturning din da dmonthly dpermit? d- d dcorrect danswer. d d d1. dunder dconstruction
why dis dgrit dwashed? d- d dcorrect danswer. d d ddecrease dthe dconcentration dof dorganic dmatter what dis dthe dsimpler dactivated dsludge dprocess dto doperate? d- d dcorrect danswer. d d dextended daeration what d 2 dthings dare dsludge dvolume dreadings dused dto dobserve? d- d dcorrect danswer. d d d1. dsludge dquality
If da dwaste dwater dspill doccurs dthat dendangers dhuman dhealth dor denvironmental dsafety, dwhen dmust dthe dTexas dWater dCommission dbe dcontacted? d- d dcorrect danswer. d d dwithin d 24 dhours dby dphone; dwithin d 5 ddays dby dwritten dreport What d 4 dreasons dcan dresult din dup dto d$10,000/day dfines dlevied dagainst da dwastewater dfacility dby dthe dTexas dWater dCommission? d- d dcorrect danswer. d d d1. dViolation dof dthe dTWC drule, da dwaste dpermit dor dorder dof dthe dcommission
What dshould dbe dused dto drecord dpermanent ddata din da dtreatment dplant's dlog? d- d dcorrect danswer. d d dBlack dink The delectric dcurrent dflowing din da d 120 dvolt dcircuit dthat dlights da d 75 dwatt dbulb dis dsufficient dto dcause dwhat? d- d dcorrect danswer. d d dsevere dmuscular dcontractions How doften dshould dthe dself-contained dbreathing dapparatus dbe dchecked? d- d dcorrect danswer. d d dMonthly dand dafter deach duse Never dwork din dconfined dspaced dwhere dthe doxygen dpercent dis dless dthan dwhat? d- d dcorrect danswer. d d d19.5% Why dare dthe dpresence dof ddangerous dgases dnot dalways didentified dby dan dunpleasant dodor? d- d dcorrect danswer. d d dSome ddangerous dgases dhave dno dodor What d 2 dmajor ddefects dcan dcause dhydraulic doverloading dof dwastewater dcollection dsystems dand dtreatment dplants? d- d dcorrect danswer. d d d1. dInfiltration d
what dis dthe dminimum dflow dvelocity drequired din dsewage dcollection dand dtransfer dsystems din dorder dto dkeep dthe dsolids din dsuspension? d- d dcorrect danswer. d d d2.0 dfeet dper dsecond When ddoes dalgae din da dfacultative dpond dconsume doxygen? d- d dcorrect danswer. d d dDay d- dsunlight The dchlorine ddemand dis dthe ddifference dbetween dwhat? d- d dcorrect danswer. d d damount dof dchlorine dadded dand dthe damount dof dchlorine dremaining dafter da dcontact dperiod An defficient dprimary dclarifier dis dexpected dto dremove dwhat dpercent dof dthe dinfluent dsettleable dsolids? d- d dcorrect danswer. d d d90% dor dmore What doverloading dis done (^) ddshortof da dstabilization dterm dcorrective dpond? dmeasure d- d dcorrect dfor ddanswer.the dsubsequent d d dsodium dloss dnitrate dof dD.O. dcaused dby
What dhas dthe dleast dinfluence don dthe dsettle-ability dof dsolids din da dclarifier? d- d dcorrect danswer. d d dsoluble dB.O.D. Proper doperation dof da dfacultative dpond dsystem drequires dwhat? d- d dcorrect danswer. d d dadequate dD.O. dat dthe dsurface dat dall dtimes What dwould dcause da dcolored ddye dsolution dadded dto draw dwastewater dentering da dprimary ddsettlingcorrect ddanswer.tank dto dbe d d dWastewater dnoticeable d indis d 15 dpasseing dminutes dthrough dbut dpassed dthe dtank dthrough dso dfast dwithin dthat d (^40) dsettling dminutes? dis d- d dprobably dnot deffective. the damount dof dorganic dmatter dremoved dby da dtrickling dfilter dis ddependant don dwhat? d- d dcorrect danswer. d d drecirculation dratio What dis dthe dbest dmethod dof dpreventing dthe drecurrence dof dsmall, ddense, dpinpoint dfloc din dthe dsecondary dclarifier dof da dconventional dactivated dsludge dplant? d- d dcorrect danswer. d d dmaintain dthe dF:M dratio dnear d0.5 d(based don dB.O.D. danalysis), dand dD.O. dbetween d 1 d- d 3 dml/L What dshould dyou ddo dto dthe dplates dof da dflame darrester din dthe dgas dline dbetween da dwaste dgas dburner dand dan danaerobic ddigester? d- d dcorrect danswer. d d dinspect dand dclean dperiodically How ddegrees dshould dbelow? dthe d properd- d dcorrect dtemperature danswer. d d d dbeas d achieveddslow das d (^) possibledif dthe danaerobic ddigester dis dseveral
A dpredominance dof dwhat d 2 dthings din dthe dM.L.S.S. dis da dsign dof dgood dsludge dquality? d- d dcorrect danswer. d d dCiliates dand drotifers What dcauses dthe dwhite dthick dbillowing dfoam dcommon dduring dthe dstartup dof dan dactivated dsludge dwastewater dtreatment dplant? d- d dcorrect danswer. d d dlow dM.L.S.S.
Why dare dthe dvolatile dacids/ dalkalinity drelationship duseful din ddigester dcontrol? d- d dcorrect danswer. d d dthey dare dthe dfirst dindicators dthat dthe ddigestion dprocess dis dgoing dsour What dis dthe dbest dsolution dto dan dexcessively dthick dscummy ddark dtam dfoam dthat doccurs don dthe daeration dtank dsurface din da dconventional dactivated dsludge dplant? d- d dcorrect danswer. d d dincrease dW.A.S. drate What dsteps dshould dbe dtaken dwhen dvolatile dacids din dan danaerobic ddigester dbegin dto dincrease dbeyond dtwice dthe dbuffering dalkalinity dcapacity dof dthe ddigester dwhile dboth dpH dand dgas dproduction dare ddecreasing? d- d dcorrect danswer. d d ddecrease dsludge dfeeding drate dand dtemperature What dequipment dmay dbe dused dby dmaintenance dto dinspect dsewer dlines? d- d dcorrect danswer. d d dcamera What d 5 dthings dcan dchlorination dbe dused dfor din dwastewater dtreatment? d- d dcorrect d2.answer. dpre-chlorinate d d d1. ddisinfection dinfluent dfor dcontrol dof dhydrogen dsulfide
Why dis dit dbest dto duse das dfew ddifferent dtypes dof dlubricants din da dplant das dpossible? d- d dcorrect danswer. d d dreduce dthe dchances dof dmaking dan derror din dapplication What d 3 dthings dcan daquifer drecharge dwith dplant deffluent dbe dused dfor? d- d dcorrect danswer. d d d1. dprevention dof dsalt dwater dintrusion
What dare d 3 dindications dof ddenitrification d- d dcorrect danswer. d d d1. dgas dbubbles
In dthe dcontact dstabilization dmode dof dactivated dsludge dthe dcontact dtank ddetention dtime dis ddesigned dto dbe dless dthan dwhat? d- d dcorrect danswer. d d dother dactivated dsludge dprocesses the dsludge dis dbulking dif dthe dS.V.I. dequals dwhat? d- d dcorrect danswer. d d d 180 what dis dthe dpurpose dof dreturn dactivated dsludge? d- d dcorrect danswer. d d dremove dsolids daccumulating din dthe dclarifier; dreseeding daeration dtank dwith dbiologically dactivated dsolids 450 dparts dgas dchlorine dis dyielded dby dhow dmuch dliquid dchlorine? d- d dcorrect danswer. d d d 1 dpart
the dnitrifying dbacteria dwill dtend dto dmake dthe dmixed dliquor dPH dwhat? d- d dcorrect danswer. d d ddecrease