Giulio Munz

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Ayse Asatekin

Tufts University

Simon Mortimer

University of Reading

Abdullah M. Asiri

King AbdulAziz University (KAU) Jeddah, Saudi Arabia

Fabio A. Madau

Università di Sassari

Johann Kirsten

University of Pretoria

Jordan Grigor

Vanderbilt University

SUNOOJ KV

Pondicherry Central University

Adel Bahnasawy

Benha University

Sabrina Speich

École Normale Supérieure

Benyamin Lakitan

Universitas Sriwijaya

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Papers by Giulio Munz

Impacts of variable pH on stability and nutrient removal efficiency of aerobic granular sludge

Water science and technology : a journal of the International Association on Water Pollution Research, 2016

The impact of pH variation on aerobic granular sludge stability and performance was investigated.... more The impact of pH variation on aerobic granular sludge stability and performance was investigated. A 9-day alkaline (pH = 9) and acidic (pH = 6) pH shocks were imposed on mature granules with simultaneous chemical oxygen demand (COD), nitrogen and phosphorus removal. The imposed alkaline pH shock (pH 9) reduced nitrogen and phosphorus removal efficiency from 88% and 98% to 66% and 50%, respectively, with no further recovery. However, acidic pH shock (pH 6) did not have a major impact on nutrient removal and the removal efficiencies recovered to their initial values after 3 days of operation under the new pH condition. Operating the reactors under alkaline pH induced granules breakage and resulted in an increased solids concentration in the effluent and a significant decrease in the size of the bio-particles, while acidic pH did not have significant impacts on granules stability. Changes in chemical structure and composition of extracellular polymeric substances (EPS) matrix were sugg...

Stability of aerobic granular sludge under pH stress

pH variation can influence the stability and bioactivity of microbial aggregates. In order to inv... more pH variation can influence the stability and bioactivity of microbial aggregates. In order to investigate the impact of pH variation on aerobic granular sludge a 9-day pH shock was imposed on three identical sequencing batch reactors (SBR), namely R1, R2 and R3. Mature granular sludge cultivated using sodium acetate as the sole carbon source was used. During the shock the operating pH was changed to 6 and 9 in R1 and R3, respectively, with R2, as control reactor, operating under pH between 7.8 and 8 as usual. 9 days operation under pH 6 did not have any impact on granule stability and physical properties; while, operating under pH 9 resulted in significant destroying effects on granules structure and stability. After four days of operation under pH 9 almost all granules disintegrated and no recovery observed in the system during the shock. Therefore, high pH has destroying impact on granules stability; however, the pH limit causing disintegration of granule depends on the granule st...

Effect of bioaugmentation on Ammonia Oxidizing Bacteria (AOB) kinetics

Biological Sulfur-Oxidizing Potential of Primary and Biological Sludge in a Tannery Wastewater Treatment Plant

by Giulio Munz, Francesco Spennati, and Giulio Petroni

Water, Air, & Soil Pollution, 2015

Mori G., Vannini C., Munz G., Toninelli L., Petroni G., Lubello C., Membrane bioreactors for biological sulphide removal: operating conditions and molecular biomass characterization, Proceedings of the International Symposium on Sanitary and Environmental Engineering, 24-27 June 2008, Florence, I...

Anoxic phosphorous uptake and partial nitrification in integrated fixed film activated system

Comparing the effects of nitrite and nitrate on anoxic phosphorus uptake in IFAS systems

Nitrite inhibition and potential as electron acceptor for DPAO in IFAS systems

DPAO were present in both suspended and attached forms and performed anoxic P uptake using nitrit... more DPAO were present in both suspended and attached forms and performed anoxic P uptake using nitrite as electron acceptor in a long-term operation. IFAS system showed to be less inhibited by free nitrous acid (FNA) compared with suspended sludge systems. Unlike suspended bacteria, attached biomass could sustain their PAO/DPAO activity at elevated nitrite concentration (high inhibition) which allows IFAS system to perform biological P removal in high FNA concentration environment.

Microbial community dynamics in an industrial tannery wastewater treatment plant: a one-year monitoring by Illumina sequencing

Biological treatment processes are widely used for treating industrial wastewater in wastewater t... more Biological treatment processes are widely used for treating industrial wastewater in wastewater treatment plants due to their low operational costs and high efficiency in the removal of different substrates. In the frame of the BIOSUR project (LIFE11 ENV/IT/075), a one-year monitoring of an industrial tannery wastewater treatment plant was performed, both from chemico-physical and biological points of view. We collected 12 samples, one for each month, to investigate the evolution of the bacterial community of activated sludge in the same treatment plant during 2013. Bacterial diversity was analyzed by the use of the Illumina MiSeq platform for sequencing hypervariable regions V3-V4 in the 16S rRNA genes. Bioinformatic analysis of the obtained 12,429,502 paired-end reads was performed using the QIIME pipeline. The assembled 4,039,284 contigs were binned into 5,156 Operational Taxonomic Units (OTUs) that are assigned to taxonomic groups by the use of the Silva 111 database. Preliminar...

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