Suchergebnisse

Cover -- Copyright -- Contents -- Preface -- The unity of biofilm structures -- Comparison of the granulation of activated sludge grown on carbohydrate- and protein-rich wastewaters -- Characteristics and applicability of nitrifying granules produced in an aerobic upflow fluidized bed reactor -- Aerobic granulation during the start up of a periodic biofilter -- Study on the stability of aerobic granules in a SBAR- effect of superficial upflow air velocity and carbon source -- Microstructural optimization of wastewater treatment by aerobic granular sludge -- Population dynamics during aerobic granule formation: lessons from denaturing gradient gel electrophoresis -- Nitrifying granular sludge in a sequencing batch reactor -- Simultaneous phosphorus and nitrogen removal by aerobic granular sludge in single SBR system -- Bio-P removal profile of aerobic granular activated sludge from an anaerobic/aerobic SBR system -- Developing aerobic phenol-degrading granules from acetate-fed granules -- Treatment of food industry effluents in a granular sludge SBR -- Modelling nutrient removal of an aerobic granular sludge lab-scale SBR using ASM3 -- Aerobic granular sludge - from idea to pilot plant -- A comparative study of aerobic granulation in pilot- and laboratory-scale SBRs -- Promising results pilot research aerobic granular sludge technology at WWTP Ede -- Risks of aerobic granular sludge technology -- ethical and methodological aspects -- Discussion Outcomes.

ABSTRACT: Aerobic granular sludge (granules) is an innovative wastewater treatment, where dense biomass is in granular form. The problem of applying this technology at full scale is the granulation process time, which takes several months. In this paper, in an attempt to quicken this process, a biofilm was tested using several candidates as biodegradable support (BDS) for granulation. In this study, it was found that not only the granulation process was accelerated using sesame seeds as BDS (10, 15 and 21 days, compared to 2 months proposed by other studies), but also a new phenomenon was observed where new granules were generated from mature granules, enhancing the granulation process. This paper offers an enhanced option for granulation process. ; This research was supported with ENBE+ Project materials, whose funding was provided by SODERCAN-University of Cantabria. Moreover, this research is inside project named "It is PROCESOS BIOLOGICOS ENERGETICAMENTE EFICIENTES DE ELIMINACION DE NUTRIENTES, EN EDAR" with reference number PID2019-109265RB-I00, funded by Ministry of Science and Technology, Government of Spain.

Diclofenac is a worldwide consumed drug included in the watch list of substances to be monitored according to the European Union Water Framework Directive (Directive 2013/39/EU). Aerobic granular sludge sequencing batch reactors (AGS-SBR) are increasingly used for wastewater treatment but there is scant information on the fate and effect of micropollutants to nutrient removal processes. An AGS-SBR fed with synthetic wastewater containing diclofenac was bioaugmented with a diclofenac degrading bacterial strain and performance and microbial community dynamics was analysed. Chemical oxygen demand, phosphate and ammonia removal were not affected by the micropollutant at 0.03 mM (9.54 mg L-1). The AGS was able to retain the degrading strain, which was detected in the sludge throughout after augmentation. Nevertheless, besides some adsorption to the biomass, diclofenac was not degraded by the augmented sludge given the short operating cycles and even if batch degradation assays confirmed that the bioaugmented AGS was able to biodegrade the compound. The exposure to the pharmaceutical affected the microbial community of the sludge, separating the two first phases of reactor operation (acclimatization and granulation) from subsequent phases. The AGS was able to keep the bioaugmented strain and to maintain the main functions of nutrient removal even through the long exposure to the pharmaceutical, but combined strategies are needed to reduce the spread of micropollutants in the environment. ; info:eu-repo/semantics/acceptedVersion

Aerobic granular sludge technology will play an important role as an innovative technology alternative to the present activated sludge process in industrial and municipal wastewater treatment in the near future. Intended to fill the gaps in the studies of aerobic granular sludge, this thesis comprehensively investigates the formation, characterization and mathematical modeling of aerobic granular sludge, through integrating the process engineering tools and advanced molecular microbiology. The research results of this thesis contributed significantly to the advance of understanding and optimization of the bacterial granulation processes, the next generation of technology for cost-effective biological wastewater treatment.Dr. Bing-Jie Ni works at Advanced Water Management Centre (AWMC) of The University of Queensland, Australia.

The paper presents a set of comparative tests to evaluate the inhibitory effect of crystal violet on the respiration rate of microorganisms in conventional activated sludge and aerobic granular sludge. The tests were performed in similar conditions with the only variable of the type of sludge tested. The results emphasized that the aerobic granular sludge is less susceptible to the toxicity induced by crystal violet. The concentration of crystal violet that inhibits by 50% (CE50) the respiration rate of sludge microorganisms was determined to be, for the specific test conditions, 22.39 mg/L for the conventional activated sludge and 33.88 mg/L for the aerobic granular sludge. The paper also assesses the biodegradability potential of crystal violet from aqueous solution, in the presence of sodium acetate as co-substrate in a lab-scale sequential biological reactor with aerobic granular sludge. The experiments showed that most of the crystal violet is being initially absorbed in the matrix of the granules during the first minutes and subsequently is being removed with efficiencies above 95% within a treatment cycle of 8 hours.

The development and stability of aerobic granular sludge (AGS) was studied in two Sequencing Batch Reactors (SBRs) treating fish canning wastewater. R1 cycle comprised a fully aerobic reaction phase, while R2 cycle included a plug-flow anaerobic feeding/reaction followed by an aerobic reaction phase. The performance of the AGS reactors was compared treating the same effluents with variable salt concentrations (4.97e13.45 g NaCl/L) and organic loading rates (OLR, 1.80e6.65 kg CODs/(m3 $d)). Granulation process was faster in R2 (day 34) than in R1 (day 90), however the granular biomass formed in the fully aerobic configuration was more stable to the variable feeding composition. Thus, in R1 solid retention times (SRT), up to 15.2 days, longer than in R2, up to 5.8 days, were achieved. These long SRTs values helped the retention of nitrifying organisms and provoked the increase of the nitrogen removal efficiency to 80% in R1 while it was approximately of 40% in R2. However, the presence of an anaerobic feeding/reaction phase increased the organic matter removal efficiency in R2 (80e90%) which was higher than in R1 with a fully aerobic phase (75e85%). Furthermore, in R2 glycogen-accumulating organisms (GAOs) dominated inside the granules instead of phosphorous-accumulating organisms (PAOs), suggesting that GAOs resist better the stressful conditions of a variable and high-saline influent. In terms of AGS properties an anaerobic feeding/ reaction phase is not beneficial, however it enables the production of a better quality effluent ; This research has been financed by the Spanish Government (AEI) through the projects GRANDSEA (CTM2014-55397-JIN) and TREASURE (CTQ2017-83225-C2-1-R), and by the European Commission (EU) through the LIFE project SEACAN (LIFE14ENV/ES/000852). The authors from the USC belong to the GRC ED431C 2017/29 and CRETUS (ED431E 2018/01). All these programs are co-financed by FEDER (EU) funds ; SI