homework 14

# homework 14 - Vanessa Barela Enve 302 Homework#14 1 MSW...

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Vanessa Barela April 30, 2007 Enve 302 Homework #14 1) MSW landfills are considered under NSPS as per collection and control of non- methane organic compounds (NMOC) as per 40 CFR 60, subpart Cc. Outline the specifics of emission standards, e.g. designated design capacity, emission rate criterion, and specifications for control systems. Are there allowances made in calculating NMOC emission rates for landfills located in arid regions, such as Socorro, New Mexico? Explain. There are many emission standards for municipal solid waste (MSW) landfills which include: *The design capacity has to be greater than or equal to 2.5 million megagrams (Mg) and 2.5 million cubic meters. *The non-methane organic compound emission rate must be 50 megragrams or more per year. *The MSW landfill shall include a LFG collection system to control emissions using one of the following: 1)An open flare 2)a control system designed and operated to reduce NMOC by 98 weight % or 3) an enclosed combustion system designed to reduce outlet NMOC concentration to 20 ppm as hexane by volume and dry basis at 3% oxygen or less. To calculate the NMOC emission rates for landfills in arid regions the arid climate must receive less than 25 inches of precipitation on average per 30 years, such as New Mexico. To calculate the amount of NMOC, the k value, or methane generation rate constant, 0.02 year-1 is to be used in the equation as long as the conditions are met. - - - × = n i NMOC kt i NMOC C i e M kL M 1 9 0 ) 10 6 . 3 )( )( ( 2 Where, M NMOC =Total NMOC emission rate from the landfill, Mg/yr L o =methane generation potential, m 3 /Mg solid waste M i =Mass of solid waste, Mg T i =age in years C NMOC =concentration of NMOC, ppm as hexane If the year-to-year solid waste acceptance rate is not known then the following equation must be used. ) 10 6 . 3 ( ) ( 2 9 0 - - - × - = NMOC kt kc NMOC C e e R L M Where M NMOC =mass emission rate of NMOC, Mg/yr L o =Methane generation potential, m 3 /Mg solid waste R=average annual acceptance rate, Mg/yr

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T=age of landfill in years 2) According to 40 CFR 61, what are the HAP emission standards for mercury for mercury cell chlor-alkali plants? What are the HAP regulations for mercury emissions from wastewater sludge incineration? Briefly outline the specifics
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homework 14 - Vanessa Barela Enve 302 Homework#14 1 MSW...

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