Answer Happy

(a) Which is not included in EPA's major concern about wastewater? i) BOD ii) TSS iii) Alkalinity iv) pH (b) What system will you use if the wastewater flow fluctuates a lot? i) Equalization tank ii) Pit privy iii) Absorption field iv) Macerator (c) Which is in McAllen, TX now? i) Combined sewer ii) Separated sewer (d) What is the major goal of primary wastewater treatment? i) Removing nutrients ii) Protecting machines downstream iii) Providing organic feed to microbes iv) Disinfection (e) What is not happening in secondary wastewater treatment? i) Removing nutrients ii) Producing biomass ii) Producing biogas iv) Removing BOD (f) Which is using attached growth of microbes for pollutant removal in wastewater? 1) Trickling filter ii) Oxidation ditch iii) Activated sludge system iv) Oxidation pond ). (g) Sludge return is to achieve 1) Right F/M ratio iii) Extra nutrient recovery ii) Large particle removal iv) Enhanced biogas generation ). (h) Longer HRT implies i) Smaller reactor tank iii) Greater SRT ii) High yield iv) Larger reactor tank (i) What can cause starving microbes and low yield? i) Short SRT ii) Longer HRT ii) Excessive aeration iv) Small F/M ratio 1) Why more wastewater treatment plants are using UV, not chlorine disinfection nowadays? i) Chlorinated DBP ii) More residual by UV system