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i think i found an error on slide 124 (pg. 62) of the NC State DVD: Wastewater Systems they use BOD_ult = 5.8 mg/L to solve for D_t@1 day downstream...this 5.8 mg/L occurs at the same point D_t@1 day occurs, which is wrong i think bottom line: Deficit at downstream point corresponding to...

Situation 1 involves Activated Sludge for Industrial WW his solution seems to assume point of wastage exists on the return line - how did he arrive at this assumption?-or given this is a complete mix AS situation, are we to automatically infer the point of sludge wastage occurs on the return...

any guidance for studying Radiation? I'm almost through Lindeburg Chap 48: "Biological Effects of Radiation", and plan to get through Chap. 49: "Nuclear Shielding" this weekend, and got introduced to the topic via Chap 46: "Industrial Hygiene" while none of the Radiation equations are...

i've made countless pencil-written notes in margins in my Lindeburg and LeGrega texts during my studying? is there a rule against bringing in reference material that has hand-written pencil notes? i understand we are only allowed to write on test papers during the test, but my question is in...

Remediation Problem 4.1 Given: PCE --> TCE --> DCE isomers Find: What is not a significant pathway for degradation of perchloroethene in a soil-groundwater system? ANS Choices: (A) biological oxidation (B) chemical reduction © deamination (D) hydrolysis Solution: i know the...

pg. 40-6 Example 40.2: to use tabulated Volume CO_2 out / Vol Dry Combustion Flue Gas out (Table 40.3) at 3%v O_2 out, we need ratio of volume H in the coal to volume C in the coal...Example 40.2 gives gravimetric C & H amounts at 86.5% and 11.75% in fired coal - he equates these...

Spent all weekend working 14 of his 19 Combustion practice problems (Practice Problems book) - i'm wondering: are 19 Combustion practice problems warranted for exam prep? similar to my HVAC question a few weeks ago, 19 practice problems seems to signal a heavy emphasis on Combustion any...

Lindeburg spends 8 chapters within Topic IV: Air Resources #1: Ventilation, with a great deal of material on HVAC systems i've started to go through this material this week and it is not only difficult in my opinion, but also robust/lengthy anyone have advice/guidanc? - should i simply skim...

New to the board here I’m a practicing civil, with a decent amount of environmental course in recent past (~5yrs); opting to go after the enviro exam to hopefully trigger a career in energy-environmental Question of the night – Lindeburg’s Sample Prob. Chap 24, #12: anyone offer guidance as to...