Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing, 100083, China; College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China.
College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China.
J Environ Manage. 2019 Sep 15;246:239-246. doi: 10.1016/j.jenvman.2019.06.004. Epub 2019 Jun 7.
A forward osmotic membrane bioreactor for sludge anaerobic digestion (ad-OMBR) could realize high-solid digestion via drawing moisture out by forward osmosis (FO). Methane production and microbial community evolution were monitored in an ad-OMBR as the total solids (TS) content was gradually increased. With magnesium chloride (MgCl) and cellulose triacetate (CTA) membrane as a draw solution and FO membrane, respectively, the ad-OMBR exhibited better performance than the conventional digester, with higher solid content, organic degradation and methane content in biogas. The conductivity of the ad-OMBR did not increase, potentially because of the formation of struvite crystals aided by the reverse-fluxed Mg ions. Microbial diversity increased along with the increase in solid content based on the Shannon index, while the most operational taxonomic units were obtained in the 8% TS sludge Although phylum Firmicutes decreased when the TS content was raised to 11%, the relative abundance of Proteobacteria, Chloroflexi, Actinobacteria, and Bacteroidetes, which could also degrade organic matter, increased with increasing TS in ad-OMBR. FO membrane fouling in ad-OMBR was highly reversible.
污泥厌氧消化（ad-OMBR）正向渗透膜生物反应器（forward osmotic membrane bioreactor）可通过正向渗透（forward osmosis，FO）将水分抽出实现高固体消化。随着总固体（total solids，TS）含量的逐渐增加，监测了 ad-OMBR 中的甲烷产量和微生物群落演变。以氯化镁（magnesium chloride，MgCl）和醋酸纤维素三乙酸酯（cellulose triacetate，CTA）膜分别作为汲取液和 FO 膜，ad-OMBR 的性能优于传统消化器，具有更高的固体含量、有机物降解率和沼气中的甲烷含量。ad-OMBR 的电导率没有增加，这可能是由于反向流动的镁离子有助于形成鸟粪石晶体。根据香农指数，微生物多样性随着固体含量的增加而增加，而在 8% TS 污泥中获得了最多的操作分类单位（operational taxonomic units）。虽然当 TS 含量提高到 11%时，厚壁菌门（Firmicutes）的相对丰度减少，但也能降解有机物的变形菌门（Proteobacteria）、绿弯菌门（Chloroflexi）、放线菌门（Actinobacteria）和拟杆菌门（Bacteroidetes）的相对丰度随着 ad-OMBR 中 TS 的增加而增加。ad-OMBR 中的 FO 膜污染具有高度可逆性。
