Study of chemical wastes in the Iranian petroleum industry and feasibility of hazardous waste disposal.
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ABSTRACT:
SUBMITTER: Masoumi A
PROVIDER: S-EPMC7721774 | biostudies-literature |
REPOSITORIES: biostudies-literature
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Project description:The Dead Sea (DS) potash industry halite waste accumulation rate is estimated at 0.2 m year-1, across 140 km2 of evaporation ponds in Israel and Jordan, totaling ∼28 million m3 year-1. As accommodation in the southern DS basin space is nearly exhausted, it is planned in Israel to dredge newly precipitated salt and convey it in a solid state to the northern DS basin by constructing a 30 km conveyor to the northern DS basin where the salt will be disposed. Concerns regarding the environmental impacts of such massive undertaking led to the examination of alternative solutions. The alternative discussed in the paper, which takes into account the estimated halite waste volumes in Jordan as well, examines the feasibility for dissolution of the dredged halite and its transport in a dissolved state and disposal in the DS by seawater (SW) or desalination reject brine (RB) from the Red Sea─Dead Sea Project (RSDSP), if constructed. Results show that the high halite solubility in SW/RB and rapid dissolution kinetics are sufficiently fast to dispose of the dredged halite with the discussed volumes of the RSDSP. Thermodynamic calculations are presented to show that precipitation dynamics following the mixing of the Na+-Cl--loaded SW/RB with the DS brine could be controlled to avoid outsalting at the mixing point in the DS.
| S-EPMC10249354 | biostudies-literature
Project description:A total of 214 sampling sites of a hazardous waste disposal center were surveyed in a two-stage pollution investigation, including soil boreholes and groundwater monitoring wells. Results showed that chemical oxygen demand (COD) (4.00-2930.00 mg/L), fluoride (0.07-9.08 mg/L), chromium (0.12-1.20 μg/L), nickel (0.15-459.00 μg/L), lead (0.10-10.20 μg/L), cadmium (Cd) (0.05-16.40 μg/L), and beryllium (0.06-3.48 μg/L) were detected in groundwater samples. For soils, Cd in soil (78.7 mg/kg) exceeded the risk screening value (65 mg/kg) for soil contamination of the second type of development land (GB36600-2018), and there remained the risk of leakage in the landfill detection investigation. Then, a health risk assessment was carried out. Based on the definitions of the groundwater exposure pathway (HJ 25.3-2019) and the pollution investigation of groundwater, the carcinogenic and non-carcinogenic risks of groundwater were generally considered to be negligible. The carcinogenic risk and non-carcinogenic risk of the concerned pollutant in soil for risk assessment (Cd) under the condition of reutilization exceeded the corresponding acceptable levels (1E-06 and 1). The (non-)carcinogenic risk of Cd mainly came from oral intake of soil and inhalation of soil particles under two conditions of reutilization and non-utilization, so on-site workers and surrounding residents should be properly protected from the mouth and nose to minimize the intake of pollutants from the soil and soil particles. The area of soil contaminated by Cd was about 630.58 m2, and the amount of pollution was about 1261.16 m3. The heavy metal pollution was only distributed in the depth range of 0-2 m, and the suggested risk control value of soil pollutants under the condition of reutilization for Cd was 56 mg/kg. Based on different pollution characteristics of soil, groundwater, and the landfill, targeted control measures were proposed.
| S-EPMC8578362 | biostudies-literature
Project description:Substance use disorders are a significant public health issue. Options to dispose of controlled medications are limited, increasing the risk of diversion. Providing an alternative for disposal, a chemical denaturant, SafeMedWaste, was designed to destroy controlled substances irreversibly and safely be placed in non-hazardous landfills. Via HPLC-MS, four formulations of SafeMedWaste were tested with 34 different liquid controlled medications from DEA schedules I-V. Beta testing assessed the efficacy of SafeMedWaste in a clinical setting and on waste generated in a manufacturing setting. Furthermore, a formulation of SafeMedWaste was tested on solid controlled medications. All 34 of the liquid medications tested (e.g., amphetamine, diazepam, fentanyl, ketamine) were fully destroyed in SafeMedWaste within 2-24 h. Analysis of a beta test sample of SafeMedWaste containing fentanyl, midazolam, and morphine waste collected in a hospital showed full denaturation of these drugs in 24 h. Variants of SafeMedWaste were optimized to denature six different controlled substance waste samples from a manufacturing facility. In contrast to side-by-side studies with a charcoal disposal system using the same drugs, SafeMedWaste fully inactivated and destroyed the controlled substances in the waste streams. Another formulation of SafeMedWaste was tested on solid medications, which were fully denatured in 48-72 h. In conclusion, SafeMedWaste irreversibly denatures controlled medications that present a problem in our society.
| S-EPMC7806595 | biostudies-literature
Project description:The agricultural industry in Malaysia has grown rapidly over the years. Palm oil clinker (POC) is a byproduct obtained from the palm oil industry. Its lightweight properties allows for its utilization as an aggregate, while in powder form as a filler material in concrete. POC specimens obtained throughout each state in Malaysia were investigated to evaluate the physical, chemical, and microstructure characteristics. Variations between each state were determined and their possible contributory factors were assessed. POC were incorporated as a replacement material for aggregates and their engineering characteristics were ascertained. Almost 7% of density was reduced with the introduction of POC as aggregates. A sustainability assessment was made through greenhouse gas emission (GHG) and cost factor analyses to determine the contribution of the addition of POC to the construction industry. Addition of POC helps to lower the GHG emission by 9.6% compared to control specimens. By channeling this waste into the construction industry, an efficient waste-management system can be promoted; thus, creating a cleaner environment. This study is also expected to offer some guides and directions for upcoming research works on the incorporation of POC.
| S-EPMC5512926 | biostudies-other
Project description:BackgroundThe purpose of this study was to identify the sources of waste generation household consisting of biological material and to investigate the knowledge presented by those responsible for the generation of waste in the home environment on the potential health risk human and environmental.MethodIt is a quantitative survey performed in Parque Capuava, Santo André (SP). The questionnaire was administered by the community employers and nursing students during the consultation with nursing supervision through interview question/answer. The exclusion criteria were patients who were not in the area served by the Basic Health Unit which covers the area of Pq Capuava. The sample was consisted of 99 persons and the data collection a questionnaire was used.ResultsWe observed that 63.3% of people said to use disposables, with the majority (58.7%) of these use the public collection as the final destination of these materials. It was reported that 73.7% of those surveyed reported having knowledge about the risk of disease transmission. Public awareness of the importance of proper packaging and disposal of potentially hazardous household waste may contribute significantly to the preservation of human and environmental health and this procedure can be performed and supervised by professional nurses.ConclusionWe suggest implementation of workshops for community health workers and the general population in order to enhance their knowledge about the storage and disposal of potentially infectious waste generated at home, thereby reducing the potential risk of disease transmission by improper management.
| S-EPMC3718708 | biostudies-literature
Project description:Environmental pollution caused by petroleum hydrocarbons is being paid more and more attention worldwide. Surfactants are able to improve the solubility of petroleum hydrocarbons, but their effects on petroleum hydrocarbon degradation in composting systems are still unclear. In this study, the effects on microbial community succession were investigated by adding petroleum hydrocarbons and rhamnolipids during composting of organic wastes. The results showed that the compost and the addition of rhamnolipids could effectively reduce the petroleum hydrocarbon content with an efficiency of 73.52%, compared to 53.81% for the treatment without addition. Network analyses and Structural Equation Model suggested that there were multiple potential petroleum degraders microbes that might be regulated by nitrogen. The findings in this study can also provide an implication for the treatment of petroleum hydrocarbon pollutants from oil-polluted soil, and the technology can be potentially applied on an industrial scale in practice.
| S-EPMC9157225 | biostudies-literature
Project description:Buffing Dust Collagen (BDC) is a hazardous waste product of chromium tanning bovine hides. The aim of this study was to investigate whether BDC has the desirable properties required of modern fillers. The microstructural properties of BDC were characterized by elemental analysis (N, Cr2O3) of dry residue and scanning electron microscopy (SEM). The BDC was applied (5 to 30 parts by weight) to styrene butadiene rubber (SBR), obtaining SBR-BDC composites. The physicochemical properties of the SBR-BDC composites were examined by Fourier transform infrared analysis, SEM, UV-Vis spectroscopy, swelling tests, mechanical tests, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The biodegradability of the SBR-BDC composites and their thermo-oxidative aging were also investigated. The filler contributed to increase the cross-link density in the elastomer structure, as evidenced by enhanced mechanical strength. The introduction of a filler into the elastomer structure resulted in an increase in the efficiency of polymer bonding, which was manifested by more favorable rheological and mechanical parameters. It also influenced the formation of stable interfacial bonds between the individual components in the polymer matrix, which in turn reduced the release of compact chromium in the BDC filler. This was shown by the absorption bands for polar groups in the infrared analysis and by imaging of the vulcanization process.
| S-EPMC7177460 | biostudies-literature
Project description:The quantities of food waste (FW) are increasing yearly. Proper disposal of FW is essential for reusing value-added products, environmental protection, and human health. Based on the typical characteristics of high moisture content and high organic content of FW, hydrothermal treatment (HTT), as a novel thermochemical treatment technology, plays unique effects in the disposal and utilization of FW. The HTT of FW has attracted more and more attention in recent years, however, there are few conclusive reviews about the progress of the HTT of FW. HTT is an excellent approach to converting energy-rich materials into energy-dense fuels and valuable chemicals. This process can handle biomass with relatively high moisture content and allows efficient heat integration. This mini-review presents the current knowledge of recent advances in HTT of FW. The effects of HTT temperature and duration on organic nutritional compositions (including carbohydrates, starch, lipids, protein, cellulose, hemicellulose, lignin, etc.) and physicochemical properties (including pH, elemental composition, functional groups, fuel properties, etc.) and structural properties of FW are evaluated. The compositions of FW can degrade during HTT so that the physical and chemical properties of FW can be changed. The application and economic analyses of HTT in FW are summarized. Finally, the analyses of challenges and future perspectives on HTT of FW have shown that industrial reactors should be built effectively, and techno-economic analysis, overall energy balance, and life cycle assessment of the HTT process are necessary. The mini-review offers new approaches and perspectives for the efficient reuse of food waste.
| S-EPMC9512071 | biostudies-literature
Project description:BackgroundFive hundred milliliter bags of water, referred to as 'sachet water,' are widely used in Liberia, as they are low cost, safe sources of clean drinking water for the population.ObjectivesThis study aims to determine sources of drinking water in the study area, the rate of sachet water use, empty sachet water disposal methods and environmental problems associated with sachet water waste disposal.MethodsUsing a simple random sampling technique, 257 respondents were interviewed between April and June 2018 using structured questionnaires. On a five-point Likert scale with a mean score of 3 as the cutoff point, data were analyzed using descriptive statistics.ResultsThe paper found that sachet water (mean (M)=4.37) is an essential source of drinking water in Liberia with a daily consumption rate of at least 6 bags of sachet water per individual. Affordability, availability, and safety were named by respondents as reasons for their consumption of sachet water. Improper disposal methods practiced by the residents of Liberia included ground littering (M=3.42) and burning (M=3.03).ConclusionsSachet water consumption has contributed to environmental issues such as drainage system clogs, littering of the environment, the death of terrestrial and aquatic animals due to plastic waste consumption, reduction of oxygen for aquatic life and soil infertility. We recommend the creation of policies and enforcement of sachet water production to include reuse and recycling of sachet water by-products as a requirement for licensing of producers, provision of adequate waste bins and the use of public education campaigns to educate residents on environmental best practices.Ethics approvalThis study was approved by the Institute for Population Studies, University of Liberia, Monrovia, Liberia.Informed consentObtained.Competing interestsThe authors declare no competing financial interests.
| S-EPMC6285681 | biostudies-literature
Project description:Waste tires (granulate) and selected plastics from the automotive industry were evaluated by using the tertiary (pyrolysis) and quaternary (calorimetry) recovering. Pyrolysis is proving to be an environmentally friendly alternative to incineration and inefficient landfilling. Currently, the main challenges for pyrolysis of plastic waste are unavailability and inconsistent quality of feedstock, inefficient and hence costly sorting, and last but not least insufficient regulations around plastic waste management. Waste plastics and tire materials were characterized by TG/DTG analysis, Py-GC/MS analysis and calorimetry. TG analysis of the investigated materials gives the typical decomposition curves of synthetic polymers. The tested samples had the highest rate of weight loss process in the temperature range from 375 °C to 480 °C. Analytical pyrolysis of the tested polymers provided information on a wide variety of organic compounds that were released upon thermal loading of these materials without access to oxygen. Analytical pyrolysis offers valuable information on the spectrum of degradation products and their potential uses. Based on the results of calorimetry, it can be stated that the determined calorific value of selected plastic and rubber materials was ranging from 26.261 to 45.245 MJ/kg depending on the ash content and its composition.
| S-EPMC8271936 | biostudies-literature