Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan; Department of Chemistry, Rawalpindi Women University, 6th Road Satellite Town, Rawalpindi 46300, Pakistan.
Water Res. 2023 Oct 15;245:120595. doi: 10.1016/j.watres.2023.120595. Epub 2023 Sep 7.
In order to meet the demand of municipal wastewater for low-carbon treatment and resource recovery, a novel process of anaerobic acidification membrane bioreactor (AAMBR) assisted with a two-stage forward osmosis (FO) (FO-AAMBR-FO) was developed for simultaneously recovering organic matter and nutrients from municipal wastewater. The results indicated that the first FO process concentrated the municipal wastewater to one tenth of the initial volume. The corresponding chemical oxygen demand (COD), ammonia nitrogen (NH-N) and total phosphorus (TP) concentration reached up to 2800, 200 and 33 mg/L, respectively. Subsequently, the AAMBR was operated at pH value of 10 for treating the concentration of municipal wastewater, in which the organic matter was successfully converted to acetic acid and propionic acid with a total volatile fatty acids (VFAs) concentration of 1787 mg COD/L and a VFAs production efficiency of 62.36 % during 47 days of stable operation. After that, the NH-N and TP concentration in the effluent of the AAMBR were further concentrated to 175 and 36.7 mg/L, respectively, by the second FO process. The struvite was successfully recovered with NH-N and TP recovery rate of 94.53 % and 98.59 %, respectively. Correspondingly, the VFAs, NH-N and TP concentrations in the residual solution were 2905 mg COD/L, 11.8 and 7.92 mg/L, respectively, which could be used as the raw material for the synthesis of polyhydroxyalkanoate (PHA). Results reported here demonstrated that the FO-AAMBR-FO is a promising wastewater treatment technology for simultaneous recovery of organic matter (in form of VFAs) and nutrients (in form of struvite).
为满足城市污水低碳处理和资源回收的需求，开发了一种新型厌氧酸化膜生物反应器（AAMBR）与两段式正向渗透（FO）（FO-AAMBR-FO）联用工艺，用于同时从城市污水中回收有机物和营养物。结果表明，第一阶段 FO 过程将城市污水浓缩至初始体积的十分之一。相应的化学需氧量（COD）、氨氮（NH-N）和总磷（TP）浓度分别达到 2800、200 和 33mg/L。随后，在 pH 值为 10 的条件下，AAMBR 对浓缩的城市污水进行处理，其中有机物成功转化为乙酸和丙酸，总挥发性脂肪酸（VFAs）浓度达到 1787mg COD/L，VFAs 生成效率为 62.36%，稳定运行 47 天。此后，第二阶段 FO 过程将 AAMBR 出水的 NH-N 和 TP 浓度进一步浓缩至 175 和 36.7mg/L。成功回收了氨氮和磷，NH-N 和 TP 的回收率分别为 94.53%和 98.59%。相应地，残留液中 VFAs、NH-N 和 TP 的浓度分别为 2905mg COD/L、11.8mg/L 和 7.92mg/L，可作为合成聚羟基烷酸酯（PHA）的原料。这里报道的结果表明，FO-AAMBR-FO 是一种很有前途的废水处理技术，可同时回收有机物（以 VFAs 的形式）和营养物（以鸟粪石的形式）。
