Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 21

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  chemical treatment
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The functionalized mesoporous’ potential ability of binding heavy metals using different templates, namely cetyltrimethylammonium (CTAB) (adsorbent A) and triblock copolymer (Pluronic P123, EO20PO70EO2O, Mav = 5800) (adsorbent B), was evaluated. The synthesized materials were characterized by powder X-ray diffraction (XRD), nitrogen gas sorption, FT-IR and solid-state ¹³C and ²⁹Si NMR spectroscopy and thermogravimetry (TGA) measurements. In the adsorption experiment, the effects of several variables (stirring time, pH and presence of other metals in the medium) were studied. On the basis of these results, it was observed that the adsorption capacities were higher for adsorbent B than adsorbent A. The results also confirmed that the ureido group (CO-NH₂) has a good affect of binding metal ion.
A feeding trial with brown laying hens was carried out in order to examine the effects of chemical and hydrothermal treatment of rapeseeds on the performance and thyroid parameters of birds during a long-term experiment. Untreated and treated rapeseeds were included in layer diets at a level of 7.5, 15.0, 22.5 and 30.0%, and the results obtained were compared with a control group fed a diet containing no rapeseed. Rapeseed treatment involved a combination of chemical and hydrothermal processing with subsequent expansion and drying. This treatment decreased sinapine content, from 6152 mg rapeseed/kg to less than 50 mg/kg, and glucosinolate concentration, from 13.8 mmol per kg to 1.4 mmol per kg (basis – 91% dry matter). The inclusion of 22.5% and 30.0% of both untreated and treated rapeseeds significantly impaired egg-laying rate and feed conversion. Egg weight was significantly affected by rapeseed feeding, with a significant decline at the 30.0% vs. the 7.5% rapeseed level. Rapeseed inclusion in the diet had a negative influence on weight gain. An increase in the dietary levels of untreated rapeseeds caused a greater decrease in egg mass, hen weight and feed conversion ratio, compared with the respective levels of treated rapeseeds. Untreated rapeseeds at the lowest level of 7.5% in the diet caused an increase in thyroid weight, epithelial cell height and changes in other histomorphometric thyroid parameters, as well as a decrease in the serum concentrations of thyroid hormones. Treated rapeseeds at a dietary level of 22.5% evoked a dose response, which shows that the chemical and hydrothermal treatment of rapeseed considerably reduced the anti-thyroid effects.
Half a year experience in sludge dosing from a water treatment plant to the municipal wastewater treatment plant in Holič is presented. Sludge from the water treatment plant containing a high percentage of iron (15 t%) in different forms was used as a coagulant. The dosing of water treatment sludge at the WWTP strengthened the water treatment effect on insoluble substances, phosphorus removal, and caused a remarkable improvement of the sedimentation properties of the wastewater treatment sludge.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.