生物电化学法酸解氧化镁诱导鸟粪石结晶回收水溶液中的磷。
Bioelectrochemical acidolysis of magnesia to induce struvite crystallization for recovering phosphorus from aqueous solution.
机构信息
Key Laboratory of Yangtze River Water Environment, Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
School of Civil and Transportation Engineering, Shanghai Urban Construction Vocational College, Shanghai 200432, China.
出版信息
J Environ Sci (China). 2019 Nov;85:119-128. doi: 10.1016/j.jes.2019.05.012. Epub 2019 May 21.
A novel struvite crystallization method induced by bioelectrochemical acidolysis of magnesia (MgO) was investigated to recover phosphorus (P) from aqueous solution using a dual-chamber microbial electrolysis cell (DMEC). Magnesium ion (Mg) in the anolyte was firstly confirmed to automatically migrate from the anode chamber to the cathode chamber, and then react with ammonium (NH) and phosphate (PO) in the catholyte to form struvite. Recovery efficiency of 17.8%-60.2% was obtained with the various N/P ratios in the catholyte. When MgO (low solubility under alkali conditions) was added into the anolyte, the bioelectrochemical acidolysis of MgO naturally took place and the released Mg induced struvite crystallization in the cathode chamber for P recovery likewise. Besides, there was a strong linear positive correlation between the recovery efficiency and the MgO dosage (R = 0.935), applied voltage (R = 0.969) and N/P ratio (R = 0.905). Increasing the applied voltage was found to enhance the P recovery via promoting the MgO acidolysis and the released Mg migration, while increasing the N/P ratio in the catholyte enhanced the P recovery via promoting the struvite crystallization. Moreover, the electrochemical performance of the system was promoted due to more stable anolyte pH and lower pH gradient between the two chambers. Current density was promoted by 10%, while the COD removal efficiency was improved from 78.2% to 91.8% in the anode chamber.
一种新型的鸟粪石结晶方法，通过生物电化学酸化氧化镁（MgO），在双室微生物电解池（DMEC）中从水溶液中回收磷（P）。在阳极室中，镁离子（Mg）首先被确认为自动从阳极室迁移到阴极室，然后与阴极室中的铵（NH）和磷酸盐（PO）反应形成鸟粪石。在不同的阴极液 N/P 比下，获得了 17.8%-60.2%的回收效率。当 MgO（在碱性条件下溶解度低）加入到阳极室中时，MgO 自然发生生物电化学酸化，释放出的 Mg 同样在阴极室中诱导鸟粪石结晶以回收 P。此外，回收效率与 MgO 用量（R=0.935）、施加电压（R=0.969）和 N/P 比（R=0.905）之间存在很强的线性正相关关系。发现增加施加电压可以通过促进 MgO 酸化和释放的 Mg 迁移来提高 P 回收效率，而增加阴极液中的 N/P 比可以通过促进鸟粪石结晶来提高 P 回收效率。此外，由于阳极室中更稳定的 pH 值和较低的两室之间的 pH 梯度，系统的电化学性能得到了提高。电流密度提高了 10%，而阳极室中的 COD 去除效率从 78.2%提高到 91.8%。
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