Advances on Remediation Techniques of Cd in Contaminated Soil

2012 ◽  
Vol 600 ◽  
pp. 3-7
Author(s):  
Wen Bian ◽  
Yan Yu ◽  
Dong Yao Xu
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Current Situation ◽  
Research Directions ◽  
Existing Problems ◽  
The Future ◽  
At Home

In this paper the harm of Cd in soil and current situation of soil contaminated by Cd were discussed, and then the remediation technologies of Cd contaminated soils, which included engineering remediation methods, chemical remediation methods, bioremediation methods and agriculture remediation methods at home and abroad were roundly introduced. At the same time, pointed out existing problems and proposed research directions in the future.

The Research on the Current Situation and Advances of Petrochemical Wastewater Treatment

2012 ◽  
Vol 550-553 ◽  
pp. 2416-2419 ◽  
Author(s):  
Wen Jun Xiang
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Petrochemical Industry ◽  
Present Situation ◽  
Current Situation ◽  
High Salt ◽  
Petrochemical Wastewater ◽  
Existing Problems ◽  
The Future ◽  
At Home

At present, it is so prominent in the development of the petrochemical industry in China，and it is accompanied by petrochemical wastewater, which has become a big problem need to solve urgently.Because petrochemical wastewater mainly contains benzene-compound, organic matter, high salt wastewater and oil sewage, etc. They are very damaging and highly contaminated. The composition and properties of the petrochemical wastewater were introduced firstly, the current situation of petrochemical wastewater treatment at home and abroad were reviewed in the study. Especially the development of petrochemical industry in sichuan was introduced. Based on the present situation and the existing problems, put forward some countermeasures and expect technique develop direction in the future.

Advance in the study of Clean Straw as Energy

2012 ◽  
Vol 599 ◽  
pp. 635-639
Author(s):  
Liu Bing
Keyword(s):  
Anaerobic Digestion ◽  
Hydrogen Production ◽  
Energy Resource ◽  
Diesel Oil ◽  
Electricity Production ◽  
Existing Problems ◽  
The Future ◽  
Application Prospects ◽  
At Home

Straw biomass is a clean and recyclable energy resource. It has a lot of advantages, such as low content of sulphur, nitrogen, low pollution and so on. At present, straw biomass has been researched and used at home and abroad, mainly in the production of diesel oil by cracking, the production of ethanol by hydrolysis, fuel methanol, the production of marsh gas by anaerobic digestion, solidify biological briquettes, electricity production from crop stalks and hydrogen production from biomass, etc. This aims of our article is the features of all technologies and the existing problems, which suggests the future researches that the skills of straw biomass should be strengthened, and makes a prediction at its application prospects.

scholarly journals Research on Information Visualization Design based on Municipal Solid Waste Sorting

2020 ◽  
Vol 179 ◽  
pp. 01022
Author(s):  
Lei Yu ◽  
Min Li ◽  
Xinbo Shen
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Information Visualization ◽  
Current Situation ◽  
Visual Language ◽  
Systematic Analysis ◽  
Existing Problems ◽  
Visualization Design ◽  
Concept Of Information ◽  
At Home

By expounding the concept of information visualization and municipal solid waste sorting, this paper illustrates the importance of information visualization design in municipal solid waste sorting. Then it conducts a systematic analysis on the current situation and existing problems of the visual language of municipal solid waste sorting at home and abroad from the perspective of information visualization design. Finally, it discusses the design countermeasures of information visualization for municipal solid waste sorting, thus providing a reference for the improvement of visual language of municipal solid waste sorting in China.

scholarly journals Research of the Current Situation and Future Trend of Internet Small-Credit Companies in China—Take Chongqing as A Case Study

2019 ◽  
Vol 6 (3) ◽  
pp. 71
Author(s):  
Weiguo Qiu
Keyword(s):  
Future Development ◽  
Future Trend ◽  
Current Situation ◽  
Technological Environment ◽  
The Future ◽  
Internet Finance ◽  
Political Economic ◽  
At Home

In recent years, Internet finance has developed rapidly in China, benefiting from China's political, economic, social and technological environment. Taking Chongqing as an example, this paper analyses the current situation and the reasons behind the development of Chongqing Internet Microfinance Company, combining with the existing literature at home and abroad, as well as many excellent and enterprise cases such as Alibaba, Suning, Xiaomi, Jingdong, Baidu and so on. At the same time, it puts forward some thoughts on the future development of Internet microfinance companies.

Study on the Glass Beads Refractive Index Testing Technology

2012 ◽  
Vol 487 ◽  
pp. 805-809
Author(s):  
Jun Ma ◽  
Dong Hua Guo
Keyword(s):  
Refractive Index ◽  
Glass Bead ◽  
Glass Beads ◽  
Research Trend ◽  
Future Research ◽  
The Future ◽  
Testing Technology ◽  
At Home

this thesis discusses the main testing technologies at home and abroad relating to the glass bead refractive index, analyses the research emphases relating to the glass bead refractive index testing technology at present and point out the future research trend.

scholarly journals Fractionation of Heavy Metals in Multi-Contaminated Soil Treated with Biochar Using the Sequential Extraction Procedure

Biomolecules ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 448
Author(s):  
Mahrous Awad ◽  
Zhongzhen Liu ◽  
Milan Skalicky ◽  
Eldessoky S. Dessoky ◽  
Marian Brestic ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Ph ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Extraction Procedure ◽  
Sequential Fractionation ◽  
Relationship Of ◽  
The Relationship

Heavy metals (HMs) toxicity represents a global problem depending on the soil environment’s geochemical forms. Biochar addition safely reduces HMs mobile forms, thus, reducing their toxicity to plants. While several studies have shown that biochar could significantly stabilize HMs in contaminated soils, the study of the relationship of soil properties to potential mechanisms still needs further clarification; hence the importance of assessing a naturally contaminated soil amended, in this case with Paulownia biochar (PB) and Bamboo biochar (BB) to fractionate Pb, Cd, Zn, and Cu using short sequential fractionation plans. The relationship of soil pH and organic matter and its effect on the redistribution of these metals were estimated. The results indicated that the acid-soluble metals decreased while the fraction bound to organic matter increased compared to untreated pots. The increase in the organic matter metal-bound was mostly at the expense of the decrease in the acid extractable and Fe/Mn bound ones. The highest application of PB increased the organically bound fraction of Pb, Cd, Zn, and Cu (62, 61, 34, and 61%, respectively), while the BB increased them (61, 49, 42, and 22%, respectively) over the control. Meanwhile, Fe/Mn oxides bound represents the large portion associated with zinc and copper. Concerning soil organic matter (SOM) and soil pH, as potential tools to reduce the risk of the target metals, a significant positive correlation was observed with acid-soluble extractable metal, while a negative correlation was obtained with organic matter-bound metal. The principal component analysis (PCA) shows that the total variance represents 89.7% for the TCPL-extractable and HMs forms and their relation to pH and SOM, which confirms the positive effect of the pH and SOM under PB and BB treatments on reducing the risk of the studied metals. The mobility and bioavailability of these metals and their geochemical forms widely varied according to pH, soil organic matter, biochar types, and application rates. As an environmentally friendly and economical material, biochar emphasizes its importance as a tool that makes the soil more suitable for safe cultivation in the short term and its long-term sustainability. This study proves that it reduces the mobility of HMs, their environmental risks and contributes to food safety. It also confirms that performing more controlled experiments, such as a pot, is a disciplined and effective way to assess the suitability of different types of biochar as soil modifications to restore HMs contaminated soil via controlling the mobilization of these minerals.

scholarly journals Remediation of mercury-contaminated soils and sediments using biochar: a critical review

Biochar ◽  
2021 ◽  
Author(s):  
Qian Yang ◽  
Yongjie Wang ◽  
Huan Zhong
Keyword(s):  
Health Risks ◽  
Contaminated Soils ◽  
Functional Materials ◽  
Redox Conditions ◽  
Existing Problems ◽  
Soils And Sediments ◽  
Underlying Mechanisms ◽  
Biochar Amendment

AbstractThe transformation of mercury (Hg) into the more toxic and bioaccumulative form methylmercury (MeHg) in soils and sediments can lead to the biomagnification of MeHg through the food chain, which poses ecological and health risks. In the last decade, biochar application, an in situ remediation technique, has been shown to be effective in mitigating the risks from Hg in soils and sediments. However, uncertainties associated with biochar use and its underlying mechanisms remain. Here, we summarize recent studies on the effects and advantages of biochar amendment related to Hg biogeochemistry and its bioavailability in soils and sediments and systematically analyze the progress made in understanding the underlying mechanisms responsible for reductions in Hg bioaccumulation. The existing literature indicates (1) that biochar application decreases the mobility of inorganic Hg in soils and sediments and (2) that biochar can reduce the bioavailability of MeHg and its accumulation in crops but has a complex effect on net MeHg production. In this review, two main mechanisms, a direct mechanism (e.g., Hg-biochar binding) and an indirect mechanism (e.g., biochar-impacted sulfur cycling and thus Hg-soil binding), that explain the reduction in Hg bioavailability by biochar amendment based on the interactions among biochar, soil and Hg under redox conditions are highlighted. Furthermore, the existing problems with the use of biochar to treat Hg-contaminated soils and sediments, such as the appropriate dose and the long-term effectiveness of biochar, are discussed. Further research involving laboratory tests and field applications is necessary to obtain a mechanistic understanding of the role of biochar in reducing Hg bioavailability in diverse soil types under varying redox conditions and to develop completely green and sustainable biochar-based functional materials for mitigating Hg-related health risks.

scholarly journals Ghost guns: spookier than you think they are

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Garen J. Wintemute
Keyword(s):  
Law Enforcement ◽  
Current Situation ◽  
Domestic Terrorism ◽  
Law Enforcement Agencies ◽  
Firearm Violence ◽  
Large Numbers ◽  
Hate Violence ◽  
At Home

AbstractOff-the-books, untraceable “ghost guns” can now be manufactured at home, easily, and in large numbers; they contribute ever more frequently to firearm violence, including hate violence and domestic terrorism. The Bureau of Alcohol, Tobacco, Firearms and Explosives estimates that in 2019 alone, law enforcement agencies recovered more than 10,000 ghost guns. The manuscript describes the current situation and suggests specific actions that state and federal governments can take to avert disaster.

scholarly journals Predictive Role of Caregiver Type, Dependency Level and Time Caring on the Impact of Caring for a Dependent Relative as a Stressor

2014 ◽  
Vol 4 (3) ◽  
pp. 193-202
Author(s):  
Teresa Lanzón Serra ◽  
Amelia Díaz Martínez
Keyword(s):  
Lower Risk ◽  
Lower Number ◽  
Stress Symptoms ◽  
The Future ◽  
Predictive Role ◽  
Professional Nurses ◽  
The Impact ◽  
At Home

This work presents the evaluation of the stress symptoms associated to the task of caring for a dependent relative at home. The role played by variables such as type of caregiver (nurse/non-nurse), the relative dependency level, the number of hours per day dedicated to caring and the years the caregiver had been caring for the relative was studied. The sample was made up of 100 caregivers, and the variables associated to stress studied in the present work were intrusion, avoidance and activation. Results showed that non-nurse caregivers caring for a low dependency relative for a period of less than two years were those suffering a higher impact, with more symptoms associated to stress. Hours caring per day worked as a protective variable of stress, in that those caregivers dedicating a lower number of hours to caring had lower risk of suffering stress symptoms. These results clearly show the stressful impact of the first stages of dependency, even at the lowest level of dependency in a relative, on non-professional caregivers and highlight the need to provide strategies, similar to those shown by professional nurses looking after their own relatives, to reduce stress. This kind of intervention would prepare the caregiver for the future stages when the dependency level in the relatives and the effort caring for them would be higher.

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