Nutrient-energy-water recovery from synthetic sidestream centrate using a microbial electrolysis cell - forward osmosis hybrid system

JOURNAL OF CLEANER PRODUCTION

卷:154

Article

Zou, Shiqiang¹  Qin, Mohan¹  Moreau, Yann²  He, Zhen¹ 

[1] Virginia Polytech Inst & State Univ, Dept Civil & Environm Engn, Blacksburg, VA 24061 USA

[2] Veolia Res & Innovat North Amer, Chicago, IL 60601 USA

关键词: Resource recovery;    Forward osmosis;    Microbial electrolysis cell;    Nitrogen and phosphorus;    Mass and energy balance;   

DOI  :  10.1016/j.jclepro.2017.03.199

来源: Elsevier

【 摘 要 】

Recovery of nutrient, water, and energy from high-strength sidestream centrate offers benefits such as reusable resource, minimized discharge and cost-savings in mainstream treatment. Herein, a microbial electrolysis cell - forward osmosis (MEC-FO) hybrid system has been investigated for integrated nutrient energy-water (NEW) recovery with emphasis on quantified mass balance and energy evaluation. In a closed-loop mode, the hybrid system achieved recovery of 54.2 +/- 1.9% of water (70.4 +/- 2.4 mL), 99.7 +/- 13.0% of net ammonium nitrogen (8.99 +/- 0.75 mmol, with extended N-2 stripping), and 79.5 +/- 0.5% of phosphorus (as struvite, 0.16 +/- 0.01 mmol). Ammonium loss primarily from reverse solute flux was fully compensated by the reclaimed ammonium under 6-h extended N-2 stripping to achieve self sustained FO process. The generated hydrogen gas could potentially cover up to 28.7 +/- 1.5% of total energy input, rendering a specific energy consumption rate of 1.73 +/- 0.08 kWh m(-3) treated centrate, 0.57 +/- 0.04 kWh kg(-1) COD, 1.10 +/- 0.05 kWh kg(-1) removed NH4+-N, 1.17 +/- 0.06 kWh kg(-1) recovered NH4+ -N, or 5.75 +/- 0.54 kWh kg(-1) struvite. Recycling of excess Mg2+ reduced its dosage to 0.08 kg Mg2+ kg(-1) struvite. These results have demonstrated the successful synergy between MEC and FO to achieve multi resource recovery, and encouraged further investigation to address the challenges such as enhancing hydrogen production, reducing nutrient loss, and optimizing MEC-FO coordination towards an energy efficient NEW recovery process. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free