Influence factors of electrochemical removal of nitrogen from stored urine

doi:10.7523/j.issn.2095-6134.2015.05.005

Abstract

Abstract:

About 80% of ammonia in municipal wastewater comes from urine. In the present study, Ti/RuO₂-TiO₂ anode and stainless steel cathode were used in the nitrogen removal process of stored urine. The operating variables in the electrochemical nitrogen removal including the current density (20-100 mA/cm²), initial pH (9-12), and sodium chloride dosage (4-16 g/L) were considered to be the influence factors on the nitrogen removal. The the most effective electrochemical process was observed when utilizing a current density at about 80 mA/cm², initial pH at about 11, and sodium chloride dosage at about 8 g/L. Under the optimum conditions the removal rates of ammonia and total nitrogen were 91.83% and 88.34%,erspectively, and the reaction time was 270 min. A total of 0.311 kW·h energy was consumed for treating 1 L of stored urine. This process was rapid and efficient with low cost, and it would have promising applications in removal of nitrogen in stored urine.

Key words: electrochemical, stored urine, nitrogen removal, current density, initial pH, NaCl dosage

CLC Number:

X703.1

ZANG Haixing, HU Zhengyi, LIU Xiaoning, WEN Guoqi. Influence factors of electrochemical removal of nitrogen from stored urine[J]. , 2015, 32(5): 605-611.

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