Evaluation of electrochemical and O/UV/HO methods at various combinations during treatment of mature landfill leachate.

In this study, electrochemical treatment and application of O/UV/HO in various combinations were evaluated in respect to their efficiency to depurate mature landfill leachate. Based on preliminary experiments, electrochemical treatment using stainless-steel electrodes at 2 cm gap was performed optimally at 50 mA/cm and pH 6, while application of O at 120 L/h, UV at 991 J/cm and HO concentration of 1 g/L was carried out. Electrochemical treatment and O/UV/HO under optimal conditions were applied as follows: I) electrochemical treatment, followed by O/UV/HO and solids precipitation, II) electrochemical treatment, followed by precipitation and then by O/UV/HO treatment, and III) O/UV/HO, followed by electrochemical treatment.

Influence of the electrode and the pH on the rate and the product distribution of the electrochemical removal of nitrate.

The effect of the nature of six metal electrodes (Sn, Bi, Pb, Al, Zn, In) on the rate and the distribution of the products of the electrochemical reduction of nitrate was studied. The product distribution depends on the nature of the metal only quantitatively, while the rate of the reduction was found to be about the same on all metals when the electrolysis was performed at the same rational potential (E(r)), which is the difference between the applied potential and the potential of zero charge of each metal. Based on these results it was concluded that the mechanism of nitrate reduction is the same for all cathodes studied.

The effect of folic acid supplementation on carotid intima-media thickness in patients with cardiovascular risk: a randomized, placebo-controlled trial.

Introduction: Observational studies have suggested a causal relationship between hyperhomocysteinemia and cardiovascular complications such as stroke and ischemic heart disease. The Homocysteine Lowering Trialists' Collaboration has shown that daily administration of folic acid can significantly decrease homocysteine levels up to 25%. Aim of this study was to investigate the effect of daily supplementation of folic acid (5 mg) on IMT after 18 months of treatment in patients with at least one cardiovascular risk factor.