Thermal analysis and FTIR studies of sewage sludge produced in treatment plants. The case of sludge in the city of Uberlândia-MG, Brazil

Silva, Jader de Oliveira; Filho, Guimes Rodrigues; Meireles, Carla da Silva; Ribeiro, Sabrina Dias; Vieira, Júlia Graciele; Silva, Cleuzilene Vieira da; Cerqueira, Daniel Alves

doi:10.1016/j.tca.2011.11.010

Cited by 115 publications

(29 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(iii) Remarkable reduction of the relative intensity of hydrochars was observed at 1645 cm -1 and 1540 cm -1 . The band at 1645 cm -1 implied the stretching vibration of -C=O in ketone and amide groups (de Oliveira Silva et al, 2012) whereas the peak at 1540 cm -1 was attributed to asymmetric stretching of -C=O in carboxylic groups (Li, M. et al, 2011). This indicates that decarboxylation reactions occurred, which was consistent with carbon content change in elemental analysis revealing the release of carbon in the form of CO2.…”

Section: Evolution Of Functional Groups In Hydrocharssupporting

confidence: 60%

Energy recovery from sewage sludge using hydrothermal processing

He¹

View full text Add to dashboard Cite

show abstract

Section: Evolution Of Functional Groups In Hydrocharssupporting

confidence: 60%

Energy recovery from sewage sludge using hydrothermal processing

He¹

View full text Add to dashboard Cite

show abstract

“…Figure S2b spectra exhibits absorption band around 1052 cm −1 , which can be assigned to the C−O stretching of polysaccharides or polysaccharide-like substances [55] and 1157 cm −1 band suggested to be assigned to C−O bond of ethers or carboxylic acid [53]. Figure S2b also showed three groups of bands near 1762, 1652, and 1578 cm −1 [56] in fouling layer after NaOH, NaOCl and citric acid cleaning. These bands are suggested to be related to carbonyl, amide I, and amide II structure, which indicated the proteins [57].…”

Section: Ftir Analysismentioning

confidence: 91%

Membrane Fouling Characteristics of a Side-Stream Tubular Anaerobic Membrane Bioreactor (AnMBR) Treating Domestic Wastewater

Vincent

Tong

et al. 2018

Processes

View full text Add to dashboard Cite

A lab-scale of a side stream anaerobic membrane bioreactor (AnMBR) equipped with a tubular membrane operated at the mesophilic temperature of 37.0 ± 1.2 • C for treating domestic wastewater was tested to investigate its performance and fouling characteristics at two organic loading rates (OLR) of 0.25 kg COD m −3 d −1 , and 0.70 kg COD m −3 d −1 , respectively. The AnMBR was operated for 600 days at sludge retention time (SRT) of 100 days. This AnMBR exhibits excellent chemical oxygen demand (COD) removal of 91% at 0.25 kg COD m −3 d −1 , and 94% at 0.7 kg COD m −3 d −1 respectively, with effluent-soluble COD below 50 mg/L. Chemically-enhanced cleaning method using NaOH, NaOCl, and citric acid solution were introduced for fouling investigation at these two stages. The results showed that sequential chemical cleaning of alkaline and acid were most effective to recover the membrane flux. The alkaline cleaning was effective at removing organic foulants, while citric acid cleaning was effective at removing the scalants. The analyses of the excitation emission matrix, gel permeation chromatography, and extracellular polymeric substances indicated that major components of membrane foulants were proteins, carbohydrates, humic, and fulvic acids. At 0.25 kg COD m −3 d −1 , organic fouling was more prone to be trapped in the cake layers and responsible for membrane pore blockage, inorganic fouling exhibited marginal contribution to the membrane fouling behavior. However, at 0.70 kg COD m −3 d −1 , high concentrations of organic and inorganic foulants supported an essential role of organic and inorganic fouling on membrane fouling behavior.Processes 2018, 6, 50 2 of 17 is a challenge in many parts of the world for domestic wastewater treatment. The application of anaerobic conventional technologies, such as up-flow anaerobic sludge blanket (UASB), expanded granular sludge blanket (EGSB), and strengthened circulation anaerobic (SCA) for low-strength domestic wastewater, have shown poor quality of effluent as a result of biomass loss [5,6]. The anaerobic digestion normally operates at mesophilic temperatures due to low biomass growth rate and the reduction of substrate utilization at low operational temperatures [7,8]. Conventional anaerobic technology has been the driving tool to deal with wastewater produced in different parts of the world [9,10]. However, this conventional anaerobic technology has been limited to meet society's needs.The anaerobic membrane bioreactor (AnMBR) technology appeared to be the suitable emerging technology. AnMBR has gained in popularity for the treatment of both low-and high-strength wastewater [11] as membrane costs have dropped drastically [12]. This is largely because AnMBR has the ability to provide superior effluent quality for reuse [13], has a small footprint of operation [14], and nutrient recovery compared to conventional anaerobic treatment facility that relies on gravity sedimentation. The AnMBR process proved to be a reliable technology in tourist areas and public places for wastewat...

show abstract

“…3 shows FTIR spectra obtained from samples of substrate, inoculum and different digestates. The spectrum obtained from the CW sample presents a broad OeH absorption band which is characterised by an asymmetry around 3520 cm À1 associated to NeH stretching from amides and amines [44] in proteins. Even though CW was pre-treated by a membrane separation unit, some proteins at low concentration are still present.…”

Section: Energy Balancementioning

confidence: 99%