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Influences of P-N-containing inhibitor and memory effect on PCDD/F emissions during the full-scale municipal solid waste incineration

Author:
Ma, Yunfeng, Lin, Xiaoqing, Chen, Zhiliang, Li, Xiaodong, Lu, Shengyong, Yan, Jianhua
Source:
Chemosphere 2019 v.228 pp. 495-502
ISSN:
0045-6535
Subject:
adsorption, ammonium, chlorination, cleaning, combustion, desorption, emissions, flue gas, incinerators, municipal solid waste, phosphates, polychlorinated dibenzodioxins, polychlorinated dibenzofurans, sludge, vapor pressure, waste incineration
Abstract:
Influence of inhibition and memory effect on PCDD/Fs are carried out in a full-scale (23 t h−1) municipal solid waste (MSW) incinerator under three conditions. Ammonium dihydrogen phosphate (ADP) is injected into the post combustion zone of incinerator. The results show that the inhibition efficiency of PCDD/Fs in flue gas was 53.34% (71% for TEQ), and ADP possibly also didn't have effect on the chlorination reaction of PCDD/F formation. The memory effect phenomenon, PCDD/F adsorption/desorption, is clearly discovered in the wet scrubber system (WSS), resulting in PCDD/F concentration increased by 6.2–19.9 times. Memory effect also changes the distribution of PCDD/Fs by increasing the proportions of low-chlorinated PCDD/Fs, which is easily to be desorbed because of their higher vapor pressure comparing with the high-chlorinated PCDD/Fs. After renewing the scrubbing solution and cleaning the bottom sludge in WSS, the PCDD/F TEQ concentrations decreases from 0.51 to 0.24 ng I-TEQ Nm−3, further mitigating but still not enough to eliminate the memory effect because the PCDD/F desorption of wall and scrubber fillings in the WSS. The results are paving the way for further industrial optimized design of WSS and assist in controlling the PCDD/F emissions from MSWI.
Agid:
6392963