Biosystems and Agricultural Engineering, College of Engineering, Michigan State University, East Lansing, MI 48824, United States.
DQY Agricultural Technology Co. LTD, Beijing 100081, China.
J Hazard Mater. 2015 Mar 21;285:483-90. doi: 10.1016/j.jhazmat.2014.10.009. Epub 2014 Oct 15.
A new multiple-stage treatment process was developed via integrating electrocoagulation with biogas pumping to simultaneously reclaim anaerobic digestion effluent and clean up biogas. The 1st stage of electrocoagulation treatment under the preferred reaction condition led to removal efficiencies of 30%, 81%, 37% and >99.9% for total solids, chemical oxygen demand, total nitrogen and total phosphorus, respectively. Raw biogas was then used as a reactant and pumped into the effluent to simultaneously neutralize pH of the effluent and remove H2S in the biogas. The 2nd stage of electrocoagulation treatment on the neutralized effluent showed that under the selected reaction condition, additional 60% and 10% of turbidity and chemical oxygen demand were further removed. The study concluded a dual-purpose approach for the first time to synergistically combine biogas purification and water reclamation for anaerobic digestion system, which well addresses the downstream challenges of anaerobic digestion technology.
开发了一种新的多阶段处理工艺，通过将电凝聚与沼气泵送相结合，同时回收厌氧消化废水并净化沼气。在优选的反应条件下，电凝聚处理的第一阶段分别实现了总固体、化学需氧量、总氮和总磷去除率 30%、81%、37%和>99.9%。然后，将原始沼气用作反应物并泵入废水中，以同时中和废水的 pH 值并去除沼气中的 H2S。在中和后的废水中进行电凝聚处理的第二阶段表明，在选定的反应条件下，浊度和化学需氧量进一步去除了 60%和 10%。该研究首次提出了一种双重用途的方法，将沼气净化和水回收协同结合到厌氧消化系统中，很好地解决了厌氧消化技术的下游挑战。
