In this study, the application of freeze-concentration method to treat low-concentration polluted water was demonstrated. The effects of stirring, the temperature in a freezing cabinet and the volume of water involved in the freeze-concentration treatment of pollutants were investigated under laboratory conditions. The removal of pollutant by freeze-concentration treatment was also attempted. Results had shown that the ratio of pollutants removed was about 83% when the experiment was carried out...
Autori: Yingjie Dai, Ying Zhang, Baiyin Liu, Masahiro Teduka, Yongbo Lin, Shunitz Tanakahttp://www.ecozone.ro/reviste.php?RID=25709

Abstract Locally sourced clay from Kuala-Kangsar town in Perak state Malaysia was used in both its raw (RKKC) and modified (MKKC) form as adsorbents for the removal of methylene blue (MB) from synthetic textile wastewater in batch adsorption process. The raw clay was modified through H2SO4 acid treatment, Al(OH)3 ion exchange, calcinations and then molded into beads before freeze drying. The BET surface areas of RKKC and MKKC were 11 and 100 m2/g, respectively; their elemental analysis and ...
Autori: Manase Auta
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26717

The objective of this article is to study the evolution of soil erosion produced by the Siret River during 1989 – 2008. The hydrophysical and mechanic action of the river flow manifests by freeze, thaw, erosion, transportation, and alluvial deposit processes. The researched section was delimited in a sector of Siret River bed, where the exploitation of mineral aggregates is carried out on large areas. The influences and effects of deficient exploitation of mineral aggregates have a dire...
Autori: Stelian Cartacuzencu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26977

In studies of biochemical methane production (BMP) researchers often collate a large number of samples at the same time for a sample archive. The samples are often frozen to avoid microbial transformation, further homogenized by grinding. We studied the influence of subfreezing/thawing and drying/milling of energy crop on BMP and anaerobic biodegradability (BD). Relative standard deviation (RSD, %) between the BMP of controls and of the subfrozen was in the range 2.1–9.0%, and of the d...
Autori: Jin Mi Triolo
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27079

This study evaluates the behavior of freeze concentration of cheese whey (CW). Parameters studied were: Chemical Oxygen Demand (COD), Total Dissolved Solids (TDS), Suspended Solids (SS), Total Settleable Solids (TSS), pH and electrical conductivity (EC) in the concentrated cheese whey and in the ice. The final concentration of TDS reached was 25 ± 0.16 %wt for the liquid phase, which corresponds to a reduction of 83% of the initial volume. The COD in the ice fractions had lower values tha...
Autori: Freddy Belén
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27613

FLUCTUATION OF RIVER NETWORK WATER ENVIRONMENTAL CARRYING CAPACITY IN A COMPLICATED RIVER-LAKE SYSTEM    • MINERALOGY AND GEOCHEMICAL DISTRIBUTION OF HEAVY METALS FOR THE FAGUL CETĂȚII TAILINGS, ROMANIA    • ACCUMULATION AND AVAILABILITY OF TRACE ELEMENTS FROM SOIL INTO ORIENTAL TOBACCO GROWN IN MACEDONIA    • OLFACTORY EFFECT ON LANDSCAPE PREFERENCE    • EFFECT OF MOLASSES ADDITION AS BIODEGRADABLE MATERIAL ON PHENOL REMO...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27628

This study was carried out to determine the feasibility of applying a freeze concentration technique to rarefy milking wastewater using either a stationary wastewater vessel (the first series of tests) or a rotary ice–making machine (the second series of tests). In this study, we investigated the impact of freezing temperature, initial milking wastewater concentration and vessel depth upon the removal rate of chemical oxygen demand (COD). Results show that when the freezing temperature ...
Autori: Yingjie Dai
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27845

This study was carried out to determine the feasibility of applying a freeze-concentration technique to purify wastewater polluted with dye, such as methylene blue (MB) using a stationary wastewater vessel. In this study, we investigated the impact of freezing temperature, initial MB wastewater concentration and vessel depth upon the removal ratio of MB. Results showed that when the freezing temperature was decreased (from –5 °C to –15 °C), the freezing rate increased. The...
Autori: Yingjie Dai
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27878

The main objective of this research is to investigate the effects of lime and waste silica fume additive on a silt and its utilization on railway subgrades stabilization. For this purpose, lime and waste silica fume were added to the silty soil in different contents at the soil optimum moisture; then the California Bearing Ratio (CBR) tests were conducted on the soil samples to estimate the favorable mixture design. At the next step, a selected sample was chosen to be exposed to wetting–dr...
Autori: Reza Ziaie Moayed
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27972

In this study, the change of freeze-thaw test result of unconfined compressive strength of clayey soils reinforced with pine tree sawdust and marble dust was investigated. Mixtures containing 5%, 10% and 15% marble dust and 0.5%, 1% and 1.5% pine tree sawdust were compressed by standard Proctor test with optimum moisture content. After curing the mixture samples for 1, 7 and 28 days at a working room temperature of +21°C, they were subjected to the freeze-thaw test at -21°C, +21°C fo...
Autori: Necmi Yarbasi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28342