Pervez Md Nahid, Bilgiç Begüm, Mahboubi Amir, Uwineza Clarisse, Zarra Tiziano, Belgiorno Vincenzo, Naddeo Vincenzo, Taherzadeh Mohammad J
Sanitary Environmental Engineering Division (SEED), Department of Civil Engineering, University of Salerno, via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy; Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden.
Swedish Centre for Resource Recovery, University of Borås, 501 90 Borås, Sweden; Department of Environmental Engineering, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey.
Sci Total Environ. 2022 Jun 15;825:154084. doi: 10.1016/j.scitotenv.2022.154084. Epub 2022 Feb 23.
The potential of organic waste streams (i.e., food waste) for the sustainable production of precursor chemicals such as volatile fatty acids (VFAs) using anaerobic digestion (AD) has received significant attention in the present days. AD-derived VFAs have great market appeal if the challenges with their recovery and purification from the complex AD effluent is overcome. In this study, a microfiltration immersed membrane bioreactor (MBR) was used for the production of VFAs from food waste and simultaneously in-situ recovery of VFAs. The MBR set-up was applied for 98 days, with a maximum yield of 0.2 gVFA/gVS at an organic loading rate (OLR) of 4 g VS/L/d. The recovered permeate was then subjected to further purification using a side stream ultrafiltration unit. It was found that the removal rates of total solids (TS), total suspended solids (TSS), dissolved solids (DS), volatile solids (VS) and volatile suspended solids (VSS) were above 70-80% in both membranes (10 kDa and 50 kDa), and Phosphorus (P), Total Kjeldahl Nitrogen (TKN), chemical oxygen demand (COD), and NH-N were also removed partially. Particularly, VFAs concentration (above 6 g/L) was higher for 10 kDa at pH 5.4 in ultrafiltered solution and permeate flux decline was higher for 10 kDa at pH 5.4. These results are also supported by the measurement of UV-Vis spectra of the solution and visual appearance, providing a promising approach towards building a VFAs-based platform.
如今，利用厌氧消化（AD）将有机废物流（即食物垃圾）可持续生产挥发性脂肪酸（VFAs）等前体化学品的潜力受到了广泛关注。如果能够克服从复杂的厌氧消化流出物中回收和纯化VFAs的挑战，那么由厌氧消化产生的VFAs将具有巨大的市场吸引力。在本研究中，采用浸没式微滤膜生物反应器（MBR）从食物垃圾中生产VFAs，并同时原位回收VFAs。该MBR装置运行了98天，在有机负荷率（OLR）为4 g VS/L/d时，最大产率为0.2 gVFA/gVS。然后，使用侧流超滤装置对回收的渗透液进行进一步纯化。结果发现，两种膜（10 kDa和50 kDa）对总固体（TS）、总悬浮固体（TSS）、溶解固体（DS）、挥发性固体（VS）和挥发性悬浮固体（VSS）的去除率均高于70 - 80%，磷（P）、凯氏氮（TKN）、化学需氧量（COD）和氨氮（NH-N）也有部分去除。特别是，在pH 5.4的超滤溶液中，10 kDa膜的VFAs浓度（高于6 g/L）更高，且在pH 5.4时，10 kDa膜的渗透通量下降幅度更大。溶液的紫外 - 可见光谱测量结果和外观也支持了这些结果，为构建基于VFAs的平台提供了一种有前景的方法。
