How to Produce an Alternative Carbon Source for Denitrification by Treating and Drastically Reducing Biological Sewage Sludge

Membranes

Marco Baldi¹  Maria Cristina Collivignarelli²  Marco Carnevale Miino²  Francesca Maria Caccamo²  Stefano Bellazzi²  Alessandro Abbà³  Giorgio Bertanza³  Angela Durante⁴ 

[1] Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy;Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, 27100 Pavia, Italy;Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Via Branze 43, 25123 Brescia, Italy;Freelance Chemist, Via Carducci 12, Casirate d’Adda, 24040 Bergamo, Italy;

关键词: wastewater treatment plant;    sludge minimization;    carbon recovery;    thermophilic membrane reactor;    nitrate uptake rate tests;    respirometric tests;   

DOI  :  10.3390/membranes11120977

来源: DOAJ

【 摘 要 】

Minimizing the biological sewage sludge (BSS) produced by wastewater treatment plants (WWTPs) represents an increasingly difficult challenge. With this goal, tests on a semi-full scale Thermophilic Alternate Membrane Biological Reactor (ThAlMBR) were carried out for 12 months. ThAlMBR was applied both on thickened (TBSS) and digested biological sewage sludge (DBSS) with alternating aeration conditions, and emerged: (i) high COD removal yields (up to 90%), (ii) a low specific sludge production (0.02–0.05 kg_{VS produced}/kg_CODremoved), (iii) the possibility of recovery the aqueous carbon residue (permeate) in denitrification processes, replacing purchased external carbon sources. Based on the respirometric tests, an excellent biological treatability of the permeate by the mesophilic biomass was observed and the denitrification kinetics reached with the diluted permeate ((4.0 mgN-NO₃⁻/(g_VSS h)) were found comparable to those of methanol (4.4 mgN-NO₃⁻/(g_VSS h)). Moreover, thanks to the similar results obtained on TBSS and DBSS, ThAlMBR proved to be compatible with diverse sludge line points, ensuring in both cases an important sludge minimization.

【 授权许可】

Unknown