A) The POHC from a trial burn are shown in the table below. The incinerator was
ID: 527741 • Letter: A
Question
A) The POHC from a trial burn are shown in the table below. The incinerator was operated at a temperature of 1, 100 C. The stack gas flow rate was 5.90 dscm/s with 10.0 percent oxygen. Assuming that all the chlorine in the fed is converted to HCl and all the emissions are measured downstream of the APC equipment. Is the incinerator in compliance with the RCRA requirements with regard to the DRE, HCL emission, and particulate emission? Show all calculation. b) Describe three most important factors in incinerator design and operation. c) Describe a method of hazardous waste treatment method called the Zimmerman process. d) Write the reaction equation to reduce hexavalent chromium in chromic acid (H_2 Cr_2 O_7) to trivalent chromium using NAHSO_3. e) Sketch a diagram showing the cross sectional section of a secure landfill showing the liners, the leachate collection and monitoring system and the top cover design.Explanation / Answer
The primary criterion is 99.99%removal (“destruction and removal efficiency” or DRE) of potentially toxic or carcinogenic organic compounds (“principal organic hazardous constituents” or POHC)
benzene
DRE
= 1FOUT/ FIn
(913.98-0.2436)/913.98 *(100)
99.9733% fails
chlorobenzene
= 1FOUT/ FIn
(521.63-0.0494 )/521.63 *(100)
99.9905% passes
xylenes
= 1FOUT/ FIn
(1378.91-0.5670 )/137.91 *(100)
99.9589% fails
DREs for benzene and xylene are both below 99.99%, the unit is NOT IN COMPLIANCE
the HCl emissions are above the 1.8 kg/hr limit
he particulateconcentration may be calculated as the mass flow rate divided by the volumetric flowrate,i.e.,
Pm= (10.61 x 106mg/hr) / (5.90 dscm/s)(3600 s/hr) = 499.5 mg/dscm.
the “corrected” (for volume of “excess” air used for combustion)concentration may be calculated as
Pc=(635.8mg/dscm
which is also above the 180 mg/dscm limit
benzene
DRE
= 1FOUT/ FIn
(913.98-0.2436)/913.98 *(100)
99.9733% fails
chlorobenzene
= 1FOUT/ FIn
(521.63-0.0494 )/521.63 *(100)
99.9905% passes
xylenes
= 1FOUT/ FIn
(1378.91-0.5670 )/137.91 *(100)
99.9589% fails
DREs for benzene and xylene are both below 99.99%, the unit is NOT IN COMPLIANCE
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