[Effect of pH for the electrochemical oxidation products and oxidation pathways of ammonia].

The electrochemical oxidation of ammonia in wastewater was investigated in a flow electrochemical cell. The effect of pH on ammonia removal efficiency, oxidation products and oxidation pathways was elucidated. The experimental results indicated that, the higher production efficiency of free chlorine and hydroxyl radical can be obtained under the moderate alkaline condition, and the electrochemical oxidation rate of ammonia was higher in this condition.

[Electrochemical oxidation of ammonia nitrogen wastewater using Ti/RuO2-TiO2-IrO2-SnO2 electrode].

Electrochemical oxidation ammonia is a new method of ammonia nitrogen wastewater treatment. A study was undertaken of electrochemical oxidation ammonia wastewater in cycle mobil-electrobath. The anode was Ti/RuO2-TiO2-IrO2-SnO2 expanded metal sheet electrode.

[Electro-flotation using in solid-liquid separation of activated sludge].

The separation of suspended solids (SS) from activated sludge was carried out in an electro-flotation cell which has two sets of electrodes,three Ti/RuO2-IrO2-TiO2 anodes and three Ti screen cathodes. The effect of operating parameters on the performance of the electro-flotation system was examined. The parameters investigated were hydraulic retention time (HRT), current density, initial SS concentration and initial pH.