Treatment of hospital wastewater by supercritical water oxidation process

Top, Selin; Akgün, Mesut; Kıpçak, Ekin; Bilgili, Mehmet Sinan

doi:10.1016/j.watres.2020.116279

Cited by 79 publications

(14 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of these substances caused cytotoxicity and considerably increased the disinfection by product (DBPs) genotoxicity after processing with UV/chlorine ( Hua et al, 2021 ). Additionally, it has been established that it is not possible to treat the wastewater released from hospitals in just one step of conventional treating methods ( Top et al, 2020 ). To reduce the threats for WWTPs, it is required to conduct studies on the performance of commonly used disinfection technologies for inactivating SARS-CoV-2 in municipal wastewater.…”

Section: Approaches To Processes For the Removal Of Sars-cov-2 In Wastewater Processing Plantsmentioning

confidence: 99%

A review on detection of SARS-CoV-2 RNA in wastewater in light of the current knowledge of treatment process for removal of viral fragments

Sangkham

2021

Journal of Environmental Management

View full text Add to dashboard Cite

The entire globe is affected by the novel disease of coronavirus 2019 (COVID–19 or 2019–nCoV), which is formally recognised as Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV–2). The World Health Organisation (WHO) announced this disease as a global pandemic. The presence of SARS-CoV–2 RNA in unprocessed wastewater has become a cause of worry due to these emerging pathogens in the process of wastewater treatment, as reported in the present study. This analysis intends to interpret the destiny, environmental factors and route of transmission of SARS–CoV–2, along with its eradication by treating the wastewater for controlling and preventing its further spread. Different recovery estimations of the virus have been depicted by the detection of SARS-CoV–2 RNA in wastewater through the viral concentration techniques. Most frequently used viral concentration techniques include polyethylene glycol (PEG) precipitation, ultrafiltration, electronegative membrane, and ultracentrifugation, after which the detection and quantification of SARS-CoV–2 RNA are done in wastewater samples through quantitative reverse transcription-polymerase chain reaction (RT–qPCR). The wastewater treatment plant (WWTP) holds the key responsibility of eliminating pathogens prior to the discharge of wastewater into surface water bodies. The removal of SARS–CoV–2 RNA at the treatment stage is dependent on the operations of wastewater treatment systems during the outbreak of the virus; particularly, in the urban and extensively populated regions. Efficient primary, secondary and tertiary methods of wastewater treatment and disinfection can reduce or inactivate SARS–CoV–2 RNA before being drained out. Nonetheless, further studies regarding COVID-19-related disinfectants, environment conditions and viral concentrations in each treatment procedure, implications on the environment and regular monitoring of transmission need to be done urgently. Hence, monitoring the SARS–CoV–2 RNA in samples of wastewater under the procedure of wastewater-based epidemiology (WBE) supplement the real-time data pertaining to the investigation of the COVID-19 pandemic in the community, regional and national levels.

show abstract

Section: Approaches To Processes For the Removal Of Sars-cov-2 In Wastewater Processing Plantsmentioning

confidence: 99%

A review on detection of SARS-CoV-2 RNA in wastewater in light of the current knowledge of treatment process for removal of viral fragments

Sangkham

2021

Journal of Environmental Management

View full text Add to dashboard Cite

show abstract

“…As observed in Table 2 , the median value for the monitored hospitals between 2007 and 2019 was 1 mg L −1 while the mean value was 2.49 mg L −1 . When comparing with other studies, a hospital in Istanbul, Turkey, with 780 beds, also found anionic surfactants identified in the raw hospital effluent (Top et al, 2020 ), ranging from 0.26 to 2.08 mg L −1 , and with a mean value of 1.96 mg L −1 . Another study in French hospitals found lower values of anionic surfactants, median of 0.40 m L −1 , and a high value in urban effluents: 2 mg L −1 (Wiest et al, 2018 ).…”

Section: Resultsmentioning

confidence: 58%

Anionic surfactants monitoring in healthcare facilities — a case of Belo Horizonte City, Brazil

Trajano

Vasconcelos

Pataca

et al. 2022

Environ Monit Assess

View full text Add to dashboard Cite

Surfactants are substances that when in aquatic environments can cause negative impacts. Hospital effluents carry numerous chemicals daily, including surfactants, used in sanitization and disinfection procedures. These chemicals are found in the effluents and reach water bodies due to a lack of proper removal in the wastewater treatment plants. The present study investigated data about wastewater monitored from healthcare facilities located in the city of Belo Horizonte, Brazil, focusing on anionic surfactants. The results showed 72 establishments monitoring this parameter, resulting in a median concentration of 1 mg L −1 and 2.49 mg L −1 mean value of anionic surfactants, between 2007 and 2019. It is also observed in the correlation between surfactants and oils in all healthcare establishment sizes, except for the medium-sized. Although anionic surfactants are the most used in cleaning product formulations, cationic surfactants still do not have specific legislation in the studied country that dictates a limit for discharge into sewage; consequently, they are not routinely monitored in effluents. However, these compounds are used in the formulation of routine hospital products.

show abstract

“…An appropriate catalyst not only improves the removal of chemical oxygen demand (COD) of the waste but also enhances the selectivity of phenols into CO 2 , CH 4 , and H 2 (Nadjiba et al 2017 (Abdpour and Santos, 2020, De Silva et al 2017, Huelsman and Savage, 2013. Top et al (2020) reported that supercritical water oxidation (SCWO) process significantly removed over 90% COD, TOC, SS, and BOD of real hospital wastewater after 60 s retention time at 25 ± 1 MPa, 450°C, and H 2 O 2 /COD ratio of 1:1. They also observed over 90 and 80% removal of phosphorus and phenol respectively at the same reaction condition.…”

Section: Introductionmentioning

confidence: 99%

Supercritical water oxidation of phenol and process enhancement with in situ formed Fe2O3 nano catalyst

Al-Atta

Sher

Hazafa

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

During the past few decades, the treatment of hazardous waste and toxic phenolic compounds has become a major issue in the pharmaceutical, gas/oil, dying, and chemical industries. Considering polymerization and oxidation of phenolic compounds, supercritical water oxidation (SCWO) has gained special attention. The present study objective was to synthesize a novel in situ Fe2O3nano-catalyst in a counter-current mixing reactor by supercritical water oxidation (SCWO) method to evaluate the phenol oxidation and COD reduction at different operation conditions like oxidant ratios and concentrations. Synthesized nano-catalyst was characterized by powder X-ray diffraction (XRD) and transmission electron microscope (TEM). TEM results revealed the maximum average particle size of 26.18 and 16.20 nm for preheated and non-preheated oxidant configuration, respectively. XRD showed the clear peaks of hematite at a 2θ value of 24, 33, 35.5, 49.5, 54, 62, and 64 for both catalysts treated preheated and non-preheated oxidant configurations. The maximum COD reduction and phenol oxidation of about 93.5% and 99.9% were observed at an oxidant ratio of 1.5, 0.75 s, 25 MPa, and 380 °C with a non-preheated H2O2 oxidant, while in situ formed Fe2O3nano-catalyst showed the maximum phenol oxidation of 99.9% at 0.75 s, 1.5 oxidant ratio, 25 MPa, and 380 °C. Similarly, in situ formed Fe2O3 catalyst presented the highest COD reduction of 97.8% at 40 mM phenol concentration, 1.0 oxidant ratio, 0.75 s residence time, 380 °C, and 25 MPa. It is concluded and recommended that SCWO is a feasible and cost-effective alternative method for the destruction of contaminants in water which showed the complete conversion of phenol within less than 1 s and 1.5 oxidant ratio.

show abstract

Treatment of hospital wastewater by supercritical water oxidation process

Cited by 79 publications

References 65 publications

A review on detection of SARS-CoV-2 RNA in wastewater in light of the current knowledge of treatment process for removal of viral fragments

A review on detection of SARS-CoV-2 RNA in wastewater in light of the current knowledge of treatment process for removal of viral fragments

Anionic surfactants monitoring in healthcare facilities — a case of Belo Horizonte City, Brazil

Supercritical water oxidation of phenol and process enhancement with in situ formed Fe2O3 nano catalyst

Contact Info

Product

Resources

About