scholarly journals Effect of hydraulic retention time on ABR tail water treatment by contact oxidation process under low oxygen condition

2018 ◽  
Vol 121 ◽  
pp. 022020
Author(s):  
Xiaolong Huang ◽  
Chunhong Shi ◽  
Zhenbao Wang ◽  
Kai Jiang
Keyword(s):  
Water Treatment ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Oxidation Process ◽  
Low Oxygen ◽  
Oxygen Condition ◽  
Contact Oxidation ◽  
Tail Water

Effect of Hydraulic Retention Time on Pollutant Removal Performance of Biological Contact Oxidation Process Treating Hospital Wastewater

2014 ◽  
Vol 507 ◽  
pp. 725-729
Author(s):  
Bo Yu ◽  
Ying Zhou ◽  
Zheng Wen Huang ◽  
Li Chen
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Oxidation Process ◽  
Removal Rate ◽  
Pollutant Removal ◽  
Hospital Wastewater ◽  
Additional Processing ◽  
Contact Oxidation ◽  
Biological Contact Oxidation ◽  
Processing Steps

A study on hospital wastewater treatment was carried out using biological contact oxidation process. The effect of hydraulic retention time (HRT) on BOD5, CODCr and SS removal was investigated. The results showed that the removal rate of BOD5, and CODCr was ascending with the increase of HRT using the contrast test of five different HRTs. When the HRT was more than 4h, the effluent BOD5, CODCr could meet the discharge standard (GB18466-2005). In considering of raising the biodegradability of effluent, 4h was recommended in this study. However, the whole trend of SS variation of system was not obvious with the increase of HRT, and the effluent SS could not meet the discharge standard (20mg/L). Thus, the additional processing steps to remove SS would be necessary.

scholarly journals UV-LED Combined with Small Bioreactor Platform (SBP) for Degradation of 17α-Ethynylestradiol (EE2) at Very Short Hydraulic Retention Time

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5960
Author(s):  
Oran Fradkin ◽  
Hadas Mamane ◽  
Aviv Kaplan ◽  
Ofir Menashe ◽  
Eyal Kurzbaum ◽  
...  
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Light Emission ◽  
Degradation Products ◽  
Secondary Effluent ◽  
Direct Photolysis ◽  
Indirect Photolysis ◽  
Uv Led

Degradation of 17α-ethynylestradiol (EE2) and estrogenicity were examined in a novel oxidative bioreactor (OBR) that combines small bioreactor platform (SBP) capsules and UV-LED (ultraviolet light emission diode) simultaneously, using enriched water and secondary effluent. Preliminary experiments examined three UV-LED wavelengths—267, 279, and 286 nm, with (indirect photolysis) and without (direct photolysis) H2O2. The major degradation wavelength for both direct and indirect photolysis was 279 nm, while the major removal gap for direct vs. indirect degradation was at 267 nm. Reduction of EE2 was observed together with reduction of estrogenicity and mineralization, indicating that the EE2 degradation products are not estrogens. Furthermore, slight mineralization occurred with direct photolysis and more significant mineralization with the indirect process. The physical–biological OBR process showed major improvement over other processes studied here, at a very short hydraulic retention time. The OBR can feasibly replace the advanced oxidation process of UV-LED radiation with catalyst in secondary sedimentation tanks with respect to reduction ratio, and with no residual H2O2. Further research into this OBR system is warranted, not only for EE2 degradation, but also to determine its capabilities for degrading mixtures of pharmaceuticals and pesticides, both of which have a significant impact on the environment and public health.

scholarly journals Comparison of Azithromycin Removal from Water Using UV Radiation, Fe (VI) Oxidation Process and ZnO Nanoparticles

2020 ◽  
Vol 17 (5) ◽  
pp. 1758
Author(s):  
Amirreza Talaiekhozani ◽  
Sahar Joudaki ◽  
Farhad Banisharif ◽  
Zeinab Eskandari ◽  
Jinwoo Cho ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Zno Nanoparticles ◽  
Retention Time ◽  
Langmuir Isotherm ◽  
Hydraulic Retention Time ◽  
Oxidation Process ◽  
Radiation Power ◽  
Biological Processes ◽  
Optimal Conditions ◽  
Initial Concentration

Antibiotics are resistant to biodegradation, and their removal by biological processes is difficult. The purpose of this study was to investigate the removal of azithromycin from water using ultraviolet radiation (UV), Fe (VI) oxidation process and ZnO nanoparticles. The effect of different parameters such as pH, temperature, hydraulic retention time (HRT), the concentration of Fe (VI) and ZnO nanoparticles and UV intensity on the removal of azithromycin from water was investigated. The optimal conditions for the removal of azithromycin were a pH of 2, a temperature of 25 °C, a HRT of 15 min, and a ratio of ZnO nanoparticles to the initial concentration of azithromycin (A/P) of 0.00009 which was fitted by Langmuir isotherm. In addition, the optimal conditions for the removal of azithromycin using UV radiation were a pH of 7, a temperature of 65 °C, a HRT of 60 min, and UV radiation power of 163 mW/cm2. For the Fe (VI) oxidation process, the optimal conditions were a pH of 2, a temperature of 50 °C and a HRT of 20 min. Also, the optimal ratio of Fe (VI) to the initial concentration of antibiotic was between 0.011 and 0.012. The results of this study showed that the Fe (VI) oxidation process, UV radiation, and ZnO nanoparticles were efficient methods for the removal of azithromycin from water.

Study on the Performance of Modified UASB Process Treating Sewage

2012 ◽  
Vol 610-613 ◽  
pp. 2174-2178 ◽  
Author(s):  
Su Juan Zhang ◽  
Nai Rui Liu ◽  
Cong Xiao Zhang
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Ph Value ◽  
Domestic Sewage ◽  
Cod Removal ◽  
Uasb Reactor ◽  
Reactor Operation ◽  
Influent Concentration ◽  
Contact Oxidation ◽  
The Stability

Added the anaerobic contact oxidation fill area on traditional UASB reactor,the imitation domestic sewage was treated by this modified UASB process on this paper. The COD removal was studied by regulated temperature,hydraulic retention time(HRT) and the influent concentration; The stability of this reactor was studied by regulated pH value of inflow and effluent.The results show that,when regulated the inflow pH value about 7.5,and effluent pH by maintainned about 6.8-7.2,so ensure that the reactor operation was stable;when T=45±5°C,the COD removal can reach 92.8%; when the HRT was 10h,the COD removal is 76.8%~92%;when the inflow concentration were 500mg/L,750mg/L,1000mg/L,the average COD removal are 65.68%, 75.58% and 83.05%.

Laboratory Research of Distributed Domestic Sewage by Constructed Wetland Treatment Process

2014 ◽  
Vol 1073-1076 ◽  
pp. 799-803
Author(s):  
Yu Qian Cui ◽  
Wen Xia Xie ◽  
Yue Li
Keyword(s):  
Water Treatment ◽  
Constructed Wetland ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Activated Carbons ◽  
Removal Rate ◽  
Waste Water Treatment ◽  
Sewage Treatment ◽  
Laboratory Research ◽  
Wetland Treatment

In order to solve practical problems of rural sewage treatment, constructed wetland waste water treatment system is chose to simulate, analyze and evaluate in laboratory. Sand and gravel, granular activated carbons were used as the filter media in the constructed wetland. Experimental results show that the removal rate of filter for the water treatment increases with the rise of the hydraulic retention time and the rise of the temperature. It can be satisfied with the treatment effect at an ambient temperature of 15°C, maintained for 4 days or more hydraulic retention time.

scholarly journals Dynamics of naphthenic acids and microbial community structures in a membrane bioreactor treating oil sands process-affected water: impacts of supplemented inorganic nitrogen and hydraulic retention time

RSC Advances ◽  
2017 ◽  
Vol 7 (29) ◽  
pp. 17670-17681 ◽  
Author(s):  
Jinkai Xue ◽  
Yanyan Zhang ◽  
Yang Liu ◽  
Mohamed Gamal El-Din
Keyword(s):  
Microbial Community ◽  
Water Treatment ◽  
Retention Time ◽  
Oil Sands ◽  
Membrane Bioreactor ◽  
Hydraulic Retention Time ◽  
Inorganic Nitrogen ◽  
Naphthenic Acids ◽  
Operating Conditions ◽  
Microbial Community Structures

This study was focused on how different operating conditions affected the biodegradation of naphthenic acids and the microbial community architectures in an anoxic–aerobic membrane bioreactor for oil sands process-affected water treatment.

Micro-Polluted Water Treatment by Biological Contact Oxidation Process: Aeration Mode and Bacteria Community Analysis

2019 ◽  
Vol 36 (12) ◽  
pp. 1491-1502 ◽  
Author(s):  
Xiangxiang Han ◽  
Jingwei Feng ◽  
Liu Zhang ◽  
Binhua Cui ◽  
Jibiao Zhang ◽  
...  
Keyword(s):  
Water Treatment ◽  
Oxidation Process ◽  
Community Analysis ◽  
Polluted Water ◽  
Contact Oxidation ◽  
Biological Contact Oxidation

Influence of High-Salinity Impact Load on an Integrated Sync Contact Oxidation Process

2014 ◽  
Vol 926-930 ◽  
pp. 396-399
Author(s):  
Peng Fei Yu ◽  
Ya Ting He ◽  
Jin Xiang Fu
Keyword(s):  
Hydraulic Retention Time ◽  
High Salinity ◽  
Oxidation Process ◽  
Impact Load ◽  
Effluent Water ◽  
Sludge Treatment ◽  
Salinity Shock ◽  
Contact Oxidation ◽  
Total Nitrogen Removal ◽  
Biological Contact Oxidation

To solve the problem of high-salt ballast wastewater treatment, biological contact oxidation process by combined packing used to simulate the experimental study. When dissolved oxygen is 5 to 6, water temperature is 18 ~ 20 °C, pH is 7~8 and hydraulic retention time is 48h, the Influence of salinity dips and swells process on sludge treatment system and its effects were investigated. The results showed that salinity shock loads on the system less affected COD removal, after 3-5 days short adaptability run, the system became able to restore effluent water stability. The influence of Salinity swells process on AOB, NOB and denitrifying bacteria was greater than a dip .Salinity plunged produced smaller impact on the total nitrogen removal, while in the salinity swells TN removal reduced from 70.7% to 42%.

Experimental Research on Recycling Treatment Process of Citrate Wastewater

2012 ◽  
Vol 610-613 ◽  
pp. 1801-1805
Author(s):  
Juan Wang ◽  
Ling Fei Fan ◽  
Di Fan
Keyword(s):  
Water Treatment ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Combined Treatment ◽  
Volume Ratio ◽  
National Standard ◽  
Municipal Sewage ◽  
Ferric Salt ◽  
Wastewater Recycling

Researching on the feasibility of citrate wastewater recycling treatment, the combined treatment methods of coagulation and filtration were adopted in the recycling treatment process of citrate wastewater from secondary biological treatment effluents. Meanwhile the ferric salt and water treatment processor were used as the coagulant and filtration equipment respectively. The experiments of coagulant addition, hydraulic retention time, the volume ratio of compounded filtering materials, aeration intensity were taken respectively. The final experimental results demonstrated that at the ferric salt addition of 36 mg/L, hydraulic retention time of 40 min, the volume ratio of biological fibred ball / biological carbon and the ratio of water/gas were 1:2 and 1:6 respectively, 81.3% of COD was removed, from179.2mg/L down to33.6 mg/L and 96.7% of SS was removed, from 152.7mg/L down to below 5mg/L. The effluent of the citrate wastewater recycling treatment process with coagulation + water treatment processor could meet the National standard of Recycling and Miscellaneous usages of Municipal Sewage on COD and SS requirements.

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