Decomposition of simulated odors in municipal wastewater treatment plants by a wire-plate pulse corona reactor.
Decomposition of simulated odors in municipal wastewater treatment plants was investigated experimentally by a wire-plate pulse corona reactor. A new type of high pulse voltage source with a thyratron switch and a Blumlein pulse forming network (BPFN) was adopted in our experiments, and the testing malodorants were ammonia, ethanethiol and tri-methyl amine, respectively. The maximum output power of the pulse voltage source and the maximum peak voltage were 1 kW and 100 kV. The experiments were conducted at the gas-flow rate of 4.0-23.0 m3 h(-1). Important parameters, including peak voltage, pulse frequency, capacitance (inductance) of the BPFN, gas-flow rate, initial concentration, which influenced on the removal efficiency, were investigated. The results show that the odors can be treated effectively. Almost 100% removal efficiency was obtained for 32 mg m(-3) ammonia at the gas-flow rate of 4.0 m(3) h(-1). The maximum removal efficiencies of 85 mg m(-3) ethanethiol and 750 mg m(-3) tri-methyl amine at 10.0 m(3) h(-1) were 98% and 91%, respectively. The energy yield of 110 mg m(-3) ammonia was 2.99 g kWh(-1) when specific energy density was 106 Jl(-1). In the cases of ammonia, ethanethiol and tri-methyl amine removal, ozone and nitrogen oxides were observed in the exit gas. The carbon and sulfur elements of ethanethiol and tri-methyl amine were mainly converted to carbon dioxide, carbon monoxide and sulfur dioxide. Moreover, the ammonium nitrates and sulfur were discovered in the reactor.
Ruan
Jian-Jun
JJ
Department of Environmental Engineering, Zhejiang University, Hangzhou, 310027, China. ruanjj80@sohu.com
Li
Wei
W
Shi
Yao
Y
Nie
Yong
Y
Wang
Xin
X
Tan
Tian-En
TE
D000641:Ammonia / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods*; D008744:Methylamines / Q000737:chemistry; D009812:Odorants / Q000032:analysis*; D017550:Spectroscopy, Fourier Transform Infrared; D013438:Sulfhydryl Compounds / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*
D008744:Methylamines; D013438:Sulfhydryl Compounds; D000641:Ammonia; C023336:trimethylamine; C007638:ethanethiol