Sorption properties of carbon waste pyrolysis product for biological wastewater treatment

© 2017 Institute of Thermomechanics CAS, v.v.i.Influence of pH, temperature and time of contact for adsorption of heavy metals are studied. Experiments on model solutions of heavy metals ions at 20 °C against constant pH value are provided. From the obtained data, isotherms of sorption are constructed and sorption size is calculated. Dependence of sorption extent of heavy-metal ions on volume of the past model solution is studied. Also, the influence of temperature and time on the sorption of heavy-metal ions is investigated. It is found that the adsorption time is 15 minutes for copper ions and 10 minutes for the iron and chromium ions. When the temperature rises to 60 °C, the time of sorption of heavy-metal ions is reduced insignificantly (on 5-10 min). According to the obtained results, the maximum degree of adsorption on iron ions (III) was 95.9 %. After passing through the sorbent model solution obtained in 4 dm3 volume, the degree of adsorption decreased to 50.9%

Results of AAS measurements of atmospheric trace metals deposition in snow cover in lower kama urban agglomeration

The study of pollutant level of snow cover of the explored territory required establishment of more than 80 sample plots within the territory of several hundreds square kilometers including industrial area of Naberezhnye Chelny (steam power plants, JSC KAMAZ plants, etc.), which are exposed to intense human impact of the area of agroindustrial complex of the Tukai district, the part of "Lower Kama" national park area, and the territory of the city of Naberezhnye Chelny as well. Within the framework of the study snow sampling was carried out within these sample plots, its main features and contaminators' weight content were defined. Moreover, the results of long-term observations over snow cover state of the territory of the Naberezhnye Chelny (Lower Kama) urban agglomeration that allow - taking into account synoptic conditions by the end of cold period - forecasting the beginning of intense snow melting and planning snow-measuring measures and sampling correspondingly. To assess impact on environment, accumulated with snow and soil cover of pollutants, their inflow per unit area and per explored territory was estimated. Obtained results allowed to asses the snow cover contamination level by several complex indicators. The snow cover contamination level based on this data should be recognized as quite considerable: median value of contamination total index Kp5 is 15,1 that allow us to relate this territory to heavily polluted. Whereby partial coefficients of contamination with cooper and zinc, and manganese iron and nickel to a somewhat less degree, make a major contribution to this index

Accessing methadone within Moldovan prisons: Prejudice and myths amplified by peers.

BACKGROUND: The volatile HIV epidemic in Moldova, driven primarily by people who inject drugs (PWIDs), is concentrated in prisons. Although internationally recommended opioid agonist therapy (OAT) is available in Moldovan prisons, coverage remains inadequate and expansion efforts have failed to meet national and international goals. METHODS: To better understand why eligible prisoners are reluctant to initiate OAT, we surveyed recently released prisoners who met criteria for opioid dependence and compared those who had and had not been enrolled in within-prison OAT (N=56) using standardized scales on OAT knowledge and attitudes as well as within-prison harassment experiences. RESULTS: Knowledge about OAT was similar between both groups, but this knowledge and myths about OAT had independent and opposite direct effects on OAT attitudes. Those who were enrolled in OAT in prison were significantly more likely to perceive it as an effective form of treatment and had more tolerable attitudes toward OAT but were also more likely to have been bullied and to express concerns about their personal safety. Prisoners who had not been enrolled in OAT were more likely to endorse negative myths about methadone; only one person among them intended to receive OAT in the future. CONCLUSION: In Moldovan prisons, OAT enrollment and treatment continuation are influenced by ideological biases and myths that are largely formed, amplified, and reinforced behaviorally in restricted prison settings. Future interventions that expand OAT in prisons should target individual-level ideological prejudices and myths, as well as the prison environment.<br/

Application of a magnetic composite sorbent on the basis of woodworking waste for sewage treatment from heavy metals

© 2010 RJPBCS.On the basis of waste of wood fiber and magnetite the composite sorbent possessing magnetic properties has been received, its physical and sorption properties, possibility of use for sewage treatment from heavy metals have been investigated, the way of regeneration and utilization of the sorbent has been offered

Sorption properties of carbon waste pyrolysis product for biological wastewater treatment

© 2017 Institute of Thermomechanics CAS, v.v.i.Influence of pH, temperature and time of contact for adsorption of heavy metals are studied. Experiments on model solutions of heavy metals ions at 20 °C against constant pH value are provided. From the obtained data, isotherms of sorption are constructed and sorption size is calculated. Dependence of sorption extent of heavy-metal ions on volume of the past model solution is studied. Also, the influence of temperature and time on the sorption of heavy-metal ions is investigated. It is found that the adsorption time is 15 minutes for copper ions and 10 minutes for the iron and chromium ions. When the temperature rises to 60 °C, the time of sorption of heavy-metal ions is reduced insignificantly (on 5-10 min). According to the obtained results, the maximum degree of adsorption on iron ions (III) was 95.9 %. After passing through the sorbent model solution obtained in 4 dm3 volume, the degree of adsorption decreased to 50.9%

Sorption properties of carbon waste pyrolysis product for biological wastewater treatment

© 2017 Institute of Thermomechanics CAS, v.v.i.Influence of pH, temperature and time of contact for adsorption of heavy metals are studied. Experiments on model solutions of heavy metals ions at 20 °C against constant pH value are provided. From the obtained data, isotherms of sorption are constructed and sorption size is calculated. Dependence of sorption extent of heavy-metal ions on volume of the past model solution is studied. Also, the influence of temperature and time on the sorption of heavy-metal ions is investigated. It is found that the adsorption time is 15 minutes for copper ions and 10 minutes for the iron and chromium ions. When the temperature rises to 60 °C, the time of sorption of heavy-metal ions is reduced insignificantly (on 5-10 min). According to the obtained results, the maximum degree of adsorption on iron ions (III) was 95.9 %. After passing through the sorbent model solution obtained in 4 dm3 volume, the degree of adsorption decreased to 50.9%

Sorption properties of carbon waste pyrolysis product for biological wastewater treatment

© 2017 Institute of Thermomechanics CAS, v.v.i.Influence of pH, temperature and time of contact for adsorption of heavy metals are studied. Experiments on model solutions of heavy metals ions at 20 °C against constant pH value are provided. From the obtained data, isotherms of sorption are constructed and sorption size is calculated. Dependence of sorption extent of heavy-metal ions on volume of the past model solution is studied. Also, the influence of temperature and time on the sorption of heavy-metal ions is investigated. It is found that the adsorption time is 15 minutes for copper ions and 10 minutes for the iron and chromium ions. When the temperature rises to 60 °C, the time of sorption of heavy-metal ions is reduced insignificantly (on 5-10 min). According to the obtained results, the maximum degree of adsorption on iron ions (III) was 95.9 %. After passing through the sorbent model solution obtained in 4 dm3 volume, the degree of adsorption decreased to 50.9%

Results of AAS measurements of atmospheric trace metals deposition in snow cover in lower kama urban agglomeration

The study of pollutant level of snow cover of the explored territory required establishment of more than 80 sample plots within the territory of several hundreds square kilometers including industrial area of Naberezhnye Chelny (steam power plants, JSC KAMAZ plants, etc.), which are exposed to intense human impact of the area of agroindustrial complex of the Tukai district, the part of "Lower Kama" national park area, and the territory of the city of Naberezhnye Chelny as well. Within the framework of the study snow sampling was carried out within these sample plots, its main features and contaminators' weight content were defined. Moreover, the results of long-term observations over snow cover state of the territory of the Naberezhnye Chelny (Lower Kama) urban agglomeration that allow - taking into account synoptic conditions by the end of cold period - forecasting the beginning of intense snow melting and planning snow-measuring measures and sampling correspondingly. To assess impact on environment, accumulated with snow and soil cover of pollutants, their inflow per unit area and per explored territory was estimated. Obtained results allowed to asses the snow cover contamination level by several complex indicators. The snow cover contamination level based on this data should be recognized as quite considerable: median value of contamination total index Kp5 is 15,1 that allow us to relate this territory to heavily polluted. Whereby partial coefficients of contamination with cooper and zinc, and manganese iron and nickel to a somewhat less degree, make a major contribution to this index

Results of AAS measurements of atmospheric trace metals deposition in snow cover in lower kama urban agglomeration

The study of pollutant level of snow cover of the explored territory required establishment of more than 80 sample plots within the territory of several hundreds square kilometers including industrial area of Naberezhnye Chelny (steam power plants, JSC KAMAZ plants, etc.), which are exposed to intense human impact of the area of agroindustrial complex of the Tukai district, the part of "Lower Kama" national park area, and the territory of the city of Naberezhnye Chelny as well. Within the framework of the study snow sampling was carried out within these sample plots, its main features and contaminators' weight content were defined. Moreover, the results of long-term observations over snow cover state of the territory of the Naberezhnye Chelny (Lower Kama) urban agglomeration that allow - taking into account synoptic conditions by the end of cold period - forecasting the beginning of intense snow melting and planning snow-measuring measures and sampling correspondingly. To assess impact on environment, accumulated with snow and soil cover of pollutants, their inflow per unit area and per explored territory was estimated. Obtained results allowed to asses the snow cover contamination level by several complex indicators. The snow cover contamination level based on this data should be recognized as quite considerable: median value of contamination total index Kp5 is 15,1 that allow us to relate this territory to heavily polluted. Whereby partial coefficients of contamination with cooper and zinc, and manganese iron and nickel to a somewhat less degree, make a major contribution to this index