Main content area

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

Ma, Yunfeng, Lin, Xiaoqing, Chen, Zhiliang, Li, Xiaodong, Lu, Shengyong, Yan, Jianhua
Chemosphere 2019 v.228 pp. 495-502
adsorption, ammonium, chlorination, cleaning, combustion, desorption, emissions, flue gas, incinerators, municipal solid waste, phosphates, polychlorinated dibenzodioxins, polychlorinated dibenzofurans, sludge, vapor pressure, waste incineration
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.