COD Removal from Cheese Wastewater Treated by Sequencing Batch Reactor

SBR applications with cheese wastewate

Cheese wastewater with sequencing batch reactor

SBR chees

Removal of arsenic by alumina. Effects of material size, additives and water contaminants

In this work an investigation on the effects of some characteristics of alumina, as material adsorbent, on the arsenic removal from water is presented. In particular, the effect of the alumina particle size on the arsenic removal effectiveness has been firstly experimentally observed, than studied by means of a diffusive model. The effects of pH and other contaminants into the aqueous solution have been also measured. Finally, an improvement of the arsenic adsorption performances has been attempted by using a TiO2 coating of commercial alumina. The characterization of the synthesized composite has been done by X-ray diffraction, BET specific area measurement and SEM. The kinetics and equilibrium experiments of removing arsenic (V) by the synthesized materials were studied in batch mode. The alumina particulate size plays a key role in the adsorption process. In fact, among the tested adsorbent types, that one having the lowest particle size showed the maximum arsenic (V) uptake capacity, which was slightly below 20 mg/g as calculated according to the Langmuir isotherm. The competitive anions such as phosphate and silica negatively affected the adsorption process determining a lower maximum uptake capacity of arsenic (V), whereas sulfate ions had a moderate positive effect within the typical groundwater arsenic concentration range

Impact of COVID19 restrictions on organic micropollutants in wastewater treatment plants and human consumption rates

COVID19 pandemic and the consequent restrictions to constrain SARS-CoV-2 spreading produced several impacts on the worldwide population. The present study focused on 10 Organic Micropollutants (illicit drugs, pharmaceuticals including some antibiotics and caffeine) and aimed to assess: (1) if COVID19 pandemic restrictions affected the load of those contaminants released into the sewage network and consequently the removal achieved by the Wastewater Treatment Plants; (2) if pursuant to the COVID19 pandemic, there was a change in population consumption rates of the same compounds through the wastewater-based epidemiology (WBE) approach. Two full-scale wastewater treatment plants (WWTPs) located in Central Italy were chosen as case studies, which are distinguished by different characteristics of the catchment area and water treatment layouts. The study was based on a 2-years monitoring activity of the concentration of the above organic micropollutants, traditional water quality parameters (COD, TSS, nitrogen compounds, total phosphorous) and flow rate in the influent and effluent. The statistical analysis of the monitoring data showed an increase of the influent load of most of the organic micropollutants. A decrease from 22% to −18% of the median removal efficiency was observed for carbamazepine in the WWTP with the lower treatment capacity only. The other compounds were removed roughly at the same rate. The application of the WBE approach demonstrated an increase in the consumption rate of cocaine, trimethoprim, sulfamethoxazole, sulfadiazine, carbamazepine and above all caffeine during the COVID19 restrictions period. These results highlight that COVID19 pandemic affected people's lifestyle and habits also as far as drugs consumption is concerned, which in turn might have an impact on the treatment efficacy of plants and finally on the receiving water body quality. Therefore, it is mandatory to keep monitoring to improve knowledge and eventually to implement the required measures to address this new problem

Sequencing Batch Reactor SBR4

Questa conferenza è una delle serie di grande successo tra le conferenze dell'IWA International. Da Monaco di Baviera 1996, questo evento si è evoluto fino a diventare uno dei forum più importanti a livello mondiale sulla tecnologia Sequencing Batch Reactor (SBR). La crescente popolarità degli SBR in tutto il mondo è ben documentata dato che in molte applicazioni hanno dimostrato di essere una valida alternativa alle tecniche di trattamento convenzionali