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Loading macroalgae into existing anaerobic digestion (AD) plants allows us to overcome challenges such as low digestion efficiencies, trace elements limitation, excessive salinity levels and accumulation of volatile fatty acids (VFAs), observed while digesting algae as a single substrate. In this work, the co-digestion of the brown macroalgaeSaccharina latissimawith mixed municipal wastewater sludge (WWS) was investigated in mesophilic and thermophilic conditions. The hydraulic retention time (HRT) and the organic loading rate (OLR) were fixed at 19 days and 2.1 g l−1 d−1of volatile solids (VS), respectively. Initially, WWS was digested alone. Subsequently, a percentage of the total OLR (20%, 50% and finally 80%) was replaced byS. latissimabiomass. Optimal digestion conditions were observed at medium-low algae loading (≤50% of total OLR) with an average methane yield close toandin mesophilic and thermophilic conditions, respectively. The conductivity values increased with the algae loading without inhibiting the digestion process. The viscosities of the reactor sludges revealed decreasing values with reduced WWS loading at both temperatures, enhancing mixing properties. [ABSTRACT FROM PUBLISHER]

The article presents a case study of a 68-year-old Caucasian man with history of asthma and nasal polyposis who developed salivary gland enlargement with eosinophilic fasciitis and mastitis. Topics discussed include the American College of Rheumatology criteria for churg–strauss syndrome, the demonstration of paranasal sinuses by computed tomography and the histological criteria for classification of CSS.