Using multi-integrated biomarker indexes approach to assess marine quality and health status of marine organism: a case study of Ruditapes philippinarum in Laizhou Bay,China

With the progress of technology and the deepening of understanding of biological monitoring, much more attention has been paid to the multiple evaluation of marine pollution monitoring. In view of this, our study aimed at establishing a multi-integrated biomarker indexes approach to evaluate marine condition systematically and comprehensively. In the current study, sampling was conducted in Laizhou Bay, China (S1, S2, and S3) in May, August, and October of 2015. And then, multi-integrated biomarker indexes approach was applied to assess marine PAHs pollution, select appropriate biomarkers, and evaluate marine environmental quality and health status of the clams of Ruditapes philippinarum. As the results showed, S2 was the most PAHs-polluted site while S1 was the least polluted site, and the levels of tPAHs in seawater and sediments ranged from 69.78 to 315.30 ng/L and 163.19 to 565.17 ng/g d.w., respectively. And all three sampling sites had different sources of PAHs. IBR represented DNA damage (F value), the expression of SOD, EROD activity, GST activity, and LPO could be served as biomarkers to monitor the PAHs pollution in Laizhou Bay. And MPI suggested the quality of all three sites: S1 was generally favorable, S2 was moderately polluted, and S3 was lightly polluted. BRI values showed that the order of health status of R. philippinarum was S1?>?S3?>?S2.

     

中石油企业可接受风险标准初步研究

本文根据可接受风险标准的确定方法和制定原则,提出了中石油企业可接受风险标准,包括员工个人可接受风险标准和员工社会可接受风险标准。     

Screening of seaweeds in the East China Sea as potential bio-monitors of heavy metals

Environmental Science and Pollution Research - Seaweeds are good bio-monitors of heavy metal pollution and have been included in European coastal monitoring programs. However, data for seaweed...     

Effects of H19/SAHH/DNMT1 on the oxidative DNA damage related to benzo[a]pyrene exposure

Environmental Science and Pollution Research - The mechanisms that long noncoding RNA (lncRNA) H19 binding to S-adenosylhomocysteine hydrolase (SAHH) interacted with DNA methyltransferase 1 (DNMT1)...     

Experimental investigation of gas explosion in single vessel and connected vessels

Gas explosion in connected vessels usually leads to high pressure and high rate of pressure increase which the vessels and pipes can not tolerate. Severe human casualties and property losses may occur due to the variation characteristics of gas explosion pressure in connected vessels. To determine gas explosion strength, an experimental testing system for methane and air mixture explosion in a single vessel, in a single vessel connected a pipe and in connected vessels has been set up. The experiment apparatus consisted of two spherical vessels of 350 mm and 600 mm in diameter, three connecting pipes of 89 mm in diameter and 6 m in length. First, the results of gas explosion pressure in a single vessel and connected vessels were compared and analyzed. And then the development of gas explosion, its changing characteristics and relevant influencing factors were analyzed. When gas explosion occurs in a single vessel, the maximum explosion pressure and pressure growth rate with ignition at the center of a spherical vessel are higher than those with ignition on the inner-wall of the vessel. In conclusion, besides ignition source on the inner wall, the ignition source at the center of the vessels must be avoided to reduce the damage level. When the gas mixture is ignited in the large vessel, the maximum explosion pressure and explosion pressure rising rate in the small vessel raise. And the maximum explosion pressure and pressure rising rate in connected vessels are higher than those in the single containment vessel. So whenever possible, some isolation techniques, such as fast-acting valves, rotary valves, etc., might be applied to reduce explosion strength in the integrated system. However, when the gas mixture is ignited in the small vessel, the maximum explosion pressures in the large vessel and in the small vessel both decrease. Moreover, the explosion pressure is lower than that in the single vessel. When gas explosion happens in a single vessel connected to a pipe, the maximum explosion pressure occurs at the end of the pipe if the gas mixture is ignited in the spherical vessel. Therefore, installing a pipe into the system can reduce the maximum explosion pressure, but it also causes the explosion pressure growth rate to increase.     

A critical review on the technique and mechanism of microwave-based denitrification in flue gas

Microwave radiation has received extensive attention due to its significant thermal and non-thermal effects, and the development of MW-based denitrification in flue gas has become one of the most promising methods to avoid the defects of ammonia escape, high temperature and cost in traditional SCR. This review introduces the thermal and non-thermal effects of microwaves and divides MW-based denitrification methods into MW reduction and oxidation denitrification, systematically summarizes these denitrification methods, including MW discharge reduction, MW-induced catalytic reduction using active carbon, molecular sieves, metal oxides (transition metals, perovskites, etc.), MW-induced oxidation denitrification with and without additional oxidant, and discusses their removal pathway and mechanism. Finally, several research prospects and directions regarding the development of microwave-based denitrification methods are provided.     

Remediation of arsenic-contaminated paddy field by a new iron oxidizing strain (Ochrobactrum sp.) and iron-modified biochar

Iron-oxidizing strain (FeOB) and iron modified biochars have been shown arsenic (As) remediation ability in the environment. However, due to the complicated soil environment, few field experiment has been conducted. The study was conducted to investigate the potential of iron modified biochar (BC-FeOS) and biomineralization by a new found FeOB to remediate As-contaminated paddy field. Compared with the control, the As contents of G_B (BC-FeOS), G_F (FeOB), G_FN (FeOB and nitrogen fertilizer), G_BF (BC-FeOS and FeOB) and G_BFN (BC-FeOS, FeOB and nitrogen fertilizer) treatments in pore water decreased by 36.53%–80.03% and the microbial richness of iron-oxidizing bacteria in these treatments increased in soils at the rice maturation stage. The concentrations of available As of G_B, G_F, G_FN, G_BF and G_BFN at the tillering stage were significantly decreased by 10.78%–55.48%. The concentrations of nonspecifically absorbed and specifically absorbed As fractions of G_B, G_F, G_FN, G_BF and G_BFN in soils were decreased and the amorphous and poorly crystalline hydrated Fe and Al oxide-bound fraction was increased. Moreover, the As contents of G_B, G_F, G_FN, G_BF and G_BFN in rice grains were significantly decreased (*P < 0.05) and the total As contents of G_FN, G_BF and G_BFN were lower than the standard limit of the National Standard for Food Safety (GB 2762-2017). Compared with the other treatments, G_BFN showed the greatest potential for the effective remediation of As-contaminated paddy fields.     

纳米TiO2/ZJ-01复合相促脱剂对高浓度氨氮吹脱效率的协同强化机制研究

为了强化煤化工废水中高浓度氨氮(500~7000mg/L)的吹脱去除效率,进一步减少投碱量,制备了一种纳米TiO₂/ZJ-01复合相促脱剂,并对其稳定性、促脱效率及强化机理进行了研究.结果表明,在有机组分质量分数6.0%,5nm TiO₂固含量0.4%,超声分散30min时,纳米TiO₂/ZJ-01复合相促脱剂性价比最好.在纳米TiO₂/ZJ-01复合相促脱剂投加量为7.5mL/L时,氨氮吹脱率便可以达到95.14%,且在任何pH值条件下投加纳米TiO₂/ZJ-01复合相促脱剂,氨氮吹脱率均能提高17.02%~32.46%.与直接吹脱法相比,投加纳米TiO₂/ZJ-01复合相促脱剂吹脱40min,原水pH=10时的氨氮吹脱率便已高于直接吹脱法pH=11.5时的氨氮吹脱率,极大降低了碱耗量.进一步对纳米TiO₂/ZJ-01复合相促脱剂作用机理研究发现,纳米TiO₂/ZJ-01复合相促脱剂能极大的降低气液相间表面张力,从而降低传质过程中的液膜阻力,减小气泡尺寸,增大传质接触面积,加快氨气的逸出;同时,在吹脱过程中纳米TiO₂/ZJ-01复合相促脱剂能够增强界面湍动及对流现象,加快气泡液膜表面部分更新,减少有效传质边界层厚度,从而降低氨氮传质阻力,强化了气液间传质的进行.     

A blessing for the Yangtze River: optimization of Chinese regional policy planning for water yield and purification in the Three Gorges Reservoir Area

Environmental Science and Pollution Research - Land use/land cover (LULC) changes impact the structure and functioning of ecosystems, which consequently influences the provisioning of a range of...     

A research on the relationship between resistivity index and relative permeability at different measurement conditions based on the pore structure

Environmental Fluid Mechanics - Relative permeability and resistivity index are important parameters in petrophysics experiments and reservoir evaluations. According to the results of previous...