Air stripping process for ammonia recovery from source-separated urine: modeling and optimization

Abstract

BACKGROUND: The air stripping process has been widely used to treat wastewater to prevent undesirable substances from impairing the quality of water sources. This study aimed to investigate the operational and economic aspects of air stripping for ammonia recovery from source separated human urine.

Removal of ammonia from a smelting wastewater by cyclic stripping and acid adsorption: Kinetics study

“…Reference pH T ( C) F 1 (m 3 Áh −1 ) C 0 (mgÁL −1 ) C t (mgÁL −1 ) t (h) G (h −1 ) This test 12 .2 25 30 5951 13 15 0.435 [15] 11.0 25 4.5 830 10 20 0.180 [16] 11.0 50 ---24 0.160 [17] 12.0 20 2.69 1964 44 19 0.200 [18] 11.0 50 70 1243 198 24 0.077 [19] 11.0 -0.9 1350 150 18 0.122 Figure 9. Parity graph for the predicted values of the overall ammonia removal rate by the proposed semiempirical model in the cyclic stripping process.…”

Integrated, multi-process approach to total nutrient recovery from stored urine

“…However, due to the elemental composition of K-struvite additional chemical input of Mg 2+ and P is required for effective K recovery. 28,30 TAN recovery by ammonia stripping-acid absorption 32,34,35 and TP recovery by struvite precipitation 21,25,27,[36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] have been studied extensively to recover a significant portion of N and P in urine. For example, major conclusions from previous research include >95% TP recovery using MgCl 2 and >90% TAN recovery by increasing the pH and temperature of the solution.…”

“…Due to the high concentration of total ammonia nitrogen (TAN), NH 3IJg) + NH 4 + (aq) , in stored urine, many technologies have been investigated for the recovery of N, including air stripping-acid absorption (hereafter referred to as ammonia stripping-acid absorption) which has shown high nutrient recovery (>80% N recovery). [31][32][33][34] The ammonia stripping-acid absorption process targets N recovery by removing ammonia from solution and concentrating it in a sulfuric acid solution. This is done by shifting the solution ammonia acid/base equilibrium towards NH 3 (unionized ammonia) via a temperature and/or pH increase.…”

Micropollutant removal and nutrient recovery for sustainable management of urban wastewater

“…Batch air stripping experiments were conducted to investigate the stripping performance under different operational parameters including pH, dilution ratio, air flow rate and temperature. The experimental parts was well described in our previous publication (Liu et al, 2014). For some nutrient recovery experiments, synthetic fresh urine prepared with Griffith et al…”

“…TSU was the residual urine solution in which the majority of phosphate (~100%) and ammonia-nitrogen (~80%) had been harvested by engaging seawater-induced struvite crystallization with subsequent ammonia stripping (Liu et al, 2013;Liu et al, 2014). The commercial flat-sheet FO membrane was obtained from Hydration Technology Innovations (HTI, Albany, OR).…”