Photocatalytic degradation of bisphenol A in aqueous solution by UV-TiO2 was studied in self-made photocatalysis reactor. The results showed that BPA was degraded effectively in UV-TiO2 photocatalysis system, and the processe followed Langmuir-Hinshelwood kinetic model. When TiO2 was dosed at 1.0 g/L, air amount was 1.2 L/min, BPA initial concentration was 10 mg/L with pH=5.5, and irradiated by a 15 W low pressure mercury vapor discharge lamp, the removal rate of BPA was up to 97%, and BPA was completely removed in 80 min when pH≥9.5; The photocatalytic removal rate constant was strongly related to the above factors.
The existence of flood diversion area could parting flood which overfufilled the quota temporarily and reduce the flood water lever in the lower river reach effectively,thus decreasing the pressure of the lower river reach.While the operational methods of flood diversion area would cause varying degrees impact on flood-control result.This paper builds a mathematical model on flood evolution of typical reach in the lower Yellow River which is based on MIKE21software.By comparing development process of the flood,flood water level in the lower river reach changes of peak discharge and the flood volume entered into flood diversion area under different situations.Study on the flood-control impact under different operational methods and entrance position of flood divertion area in the lower river reach.The results show that use the flood diversion rationally according to the flood process of upstream is benefical to decrease the pressure of the lower Yellow River.And the entrance position of flood divertion area also has obvious influence on reach flood-control.
Fluorescence spectroscopy was performed to investigate the composition changes and characteristics of the leachate DOM (dissolved organic matter) during UV-TiO 2 photocatalytic treatment process. The results showed that fulvic-like, tryptophan-like and humic acids-like matters were the main compounds in leachate. During photocatalytic treatment process, fluorescence spectroscopy of DOM changed considerably. The final products were mainly fulvic-like and tryptophan-like matters. In general, the fluorescence signals of humic acids-like matters had the most significant change, which disappeared entirely after 60 h treatment, implying that humic acids-like matters can be degraded preferentially by photocatalysis. The other notable change was in VIS fulvic-like matters region, which suggested that fulvic-like matters can be significantly degraded. In 72 h photocatalytic effluent, VIS fulvic-like, tryptophan-like and tyrosine-like matters were remained, and the last two matters were the dominant fractions. These results indicated that fulvic-like and humic acids-like matters with macromolecular can be degraded into protein-like matters with micro-molecular by photocatalysis.
Relying on existing productive embankments planning flood diversion and detension area in the lower Yellow River floodplain,is an idea to develop the Yellow River floodplain,which could develop production during dry seasons and buffer the flood during flood seasons.This paper establishes a mathematical model of flood evolution from Jiahetan reach to Gaocun reach in the lower Yellow River based on MIKE21software;and then studying the process of flood submergence in the lower Yellow River floodplain of typical river reach based on three conditions,i.e.nature condition,current condition,planning condition.The authors comparatively analyze the maximum detention volume and inundated area in the flood detention basin,the process of peak discharge,and the change of flood stage in the lower floodplain area.The results show that inundated area is reduced due to the existence of flood diversion and detension area.And the function of peak cut and flood detention are obvious.The flood diversion and detension area can also decrease the pressure of the lower Yellow River and decrease the pressure of the river for effectively protecting the production.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)
'%3e%3cpath fill='%23012169' d='M0 0v30h60V0z'/%3e%3cpath stroke='%23fff' stroke-width='6' d='m0 0 60 30m0-30L0 30'/%3e%3cpath stroke='%23C8102E' stroke-width='4' d='m0 0 60 30m0-30L0 30' clip-path='url(%23b)'/%3e%3cpath stroke='%23fff' stroke-width='10' d='M30 0v30M0 15h60'/%3e%3cpath stroke='%23C8102E' stroke-width='6' d='M30 0v30M0 15h60'/%3e%3c/g%3e%3c/svg%3e)