Application of hydroponic systems for the treatment of source-separated human urine

作者：Yang Linyan; Giannis Apostolos; Chang Victor W C^*; Liu Bianxia; Zhang Jiefeng; Wang Jing Yuan

来源：Ecological Engineering, 2015, 81: 182-191.

DOI：10.1016/j.ecoleng.2015.04.013

• Hydroponic systems
• Urine treatment
• Water spinach
• Dilution ratios
• Nitrification

Hydroponic systems are widely used for the treatment of nutrient rich wastewaters. In this study, a hydroponic system was applied as the final treatment stage of source-separated human urine after urea hydrolysis, induced-struvite precipitation and ammonia stripping in tropical conditions (Singapore). The results showed that water spinach grew efficiently in the pretreated urine with 1:50 dilution ratio at the growth rate 0.68 cm/d, leaf number 2.27 pieces/d, shoot dry mass 0.33 g, water content 93.86%, and nitrogen and potassium conversion rate 0.46 and 0.51 mg/mg, respectively. This hydroponic system removed 58-66% chemical oxygen demand (COD), 41-49% total nitrogen (TN) and up to 47% total suspended solid (TSS), indicating sufficient urine stream polishing. Nitrification was observed when COD reduced by 60%, possibly because of oxygen competition between nitrobacteria for nitrification and microbes for COD degradation. The kinetic study revealed that zero-order model provided best fitting for COD and ammonia-nitrogen (NH4+-N) removal, while second-order model was more suitable for TN removal.

• 出版日期2015-8
• 单位南阳理工学院