Hung Chang-Mao, Huang Chin-Pao, Chen Chiu-Wen, Hsieh Shuchen, Dong Cheng-Di
Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
Department of Civil and Environmental Engineering, University of Delaware, Newark, USA.
J Hazard Mater. 2021 Oct 15;420:126594. doi: 10.1016/j.jhazmat.2021.126594. Epub 2021 Jul 6.
A pilot-scale hybrid treatment system consisting of hydrodynamic cavitation (HC), hydrocyclone separator (HS), and sodium persulfate (PS), was employed for removing polycyclic aromatic hydrocarbons (PAHs) from dredged harbor sediments. The effectiveness of PAH degradation was studied by varying the inlet pressure (0-2.0 bar), PS dosage (or Σ[PAH] to [PS] mole ratio of 1:1-1:10) at HS inflow velocity of 2.85 m/s, slurry concentration of 10%, and reaction time of 60 min. The degradation rate of PAH in the overflow (OF) sediment was significantly lower than that of the underflow (UF) sediment. After an inlet pressure increase of 0.5 bar and ΣPAH: [PS] molar ratio of 1: 10, the PAH removal was 87% and 55% in the UF and OF, respectively, by the combined HC-PS-HS unit. Without PS, the PAHs removal was 46% and 40% in the UF and OF, respectively. The removal efficiency for 6-, 5-, 4-, 3-, and 2-ring PAHs was 100%, 93%, 93%, 92%, and 82% in the UF and 55%, 61%, 67%, 47%, and 36% in the OF by the combined HC-PS-HS system. FEEM spectroscopy clarified that aromatic protein-based components (tryptophan- and tyrosine-like combined) were gradually degraded and transformed into soluble microbial metabolites when organic matter content declined during the combined HC-PS-HS treatment. This study provides new insights into the combined HC-PS-HS system for PAH degradation in dredged sediments.
采用一种由水力空化（HC）、水力旋流器分离器（HS）和过硫酸钠（PS）组成的中试规模混合处理系统，用于去除疏浚港口沉积物中的多环芳烃（PAHs）。通过在HS入口流速为2.85 m/s、浆液浓度为10%、反应时间为60分钟的条件下，改变入口压力（0 - 2.0巴）、PS用量（或Σ[PAH]与[PS]的摩尔比为1:1 - 1:10），研究了PAH降解的有效性。溢流（OF）沉积物中PAH的降解率明显低于底流（UF）沉积物。在入口压力增加0.5巴且ΣPAH:[PS]摩尔比为1:10后，联合HC - PS - HS装置对UF和OF中PAH的去除率分别为87%和55%。在没有PS的情况下，UF和OF中PAHs的去除率分别为46%和40%。联合HC - PS - HS系统对UF中6环、5环、4环、3环和2环PAHs的去除效率分别为100%、93%、93%、92%和82%，对OF中分别为55% 、61%、67%、47%和36%。FEEM光谱表明，在联合HC - PS - HS处理过程中，当有机物含量下降时，基于芳香族蛋白质的成分（色氨酸和酪氨酸类组合）逐渐降解并转化为可溶性微生物代谢产物。本研究为联合HC - PS - HS系统降解疏浚沉积物中的PAH提供了新的见解。
