The Study of Hospital Wastewater Treatment by Combined Pure-Oxygen Aeration and A/O Process

2012 ◽  
Vol 178-181 ◽  
pp. 627-632
Author(s):  
Wei Wei Yu ◽  
Zhi Zhang ◽  
Shi Ling Chen ◽  
Tao Wang ◽  
Teng Can Zhang
Keyword(s):  
Wastewater Treatment ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Pollutant Removal ◽  
Nitrogen Efficiency ◽  
Pure Oxygen ◽  
Removal Mechanism ◽  
Hospital Wastewater ◽  
Actual Application ◽  
Industrial Sewage

The field in which pure oxygen aeration is applied to sewage treatment is extensive. In actual application it is more suitable for the degradation of industrial sewage. Pure oxygen aeration has unique merit compared with common air aeration. This article introduced the effect by pure oxygen aeration. The study shows pure oxygen aeration is an effective pollutant removal mechanism, and at the same time proposes the best dissolved oxygen is at 3 mg/l. The average removal rates of CODcr, NH3-N, TN are 73%, 50%, 55% respectively. The conclusion is that pure oxygen aeration for hospital wastewater the CODcr removing rate is higher than ammonia nitrogen and total nitrogen efficiency.

scholarly journals Graphene-Modulated Removal Performance of Nitrogen and Phosphorus Pollutants in a Sequencing Batch Chlorella Reactor

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2181 ◽  
Author(s):  
Gonghan Xia ◽  
Wenlai Xu ◽  
Qinglin Fang ◽  
Zishen Mou ◽  
Zhicheng Pan
Keyword(s):  
Optical Microscopy ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Pollutant Removal ◽  
Plate Count ◽  
Nitrogen And Phosphorus ◽  
Removal Rates ◽  
Practical Support ◽  
Plate Count Method ◽  
The Impact

In this work, the influence of graphene on nitrogen and phosphorus in a batch Chlorella reactor was studied. The impact of graphene on the removal performance of Chlorella was investigated in a home-built sewage treatment system with seven identical sequencing batch Chlorella reactors with graphene contents of 0 mg/L (T1), 0.05 mg/L (T2), 0.1 mg/L (T3), 0.2 mg/L (T4), 0.4 mg/L (T5), 0.8 mg/L (T6) and 10 mg/L (T7). The influence of graphene concentration and reaction time on the pollutant removal performance was studied. The malondialdehyde (MDA) and total superoxide dismutase (SOD) concentrations in each reactor were measured, and optical microscopy and scanning electron microscopy (SEM) characterizations were performed to determine the related mechanism. The results show that after 168 h, the total nitrogen (TN), ammonia nitrogen (AN) and total phosphorus (TP) removal rates of reactors T1–T7 become stable, and the TN, AN and TP removal rates were gradually reduced with increasing graphene concentration. At 96 h, the concentrations of both MDA and SOD in T1–T7 gradually increased as the graphene concentration increased. In optical microscopy and SEM measurements, it was found that graphene was adsorbed on the surface of Chlorella, and entered Chlorella cells, deforming and reducing Chlorella. Through the blood plate count method, we estimated an average Chlorella reduction of 16%. According to the water quality and microscopic experiments, it can be concluded that the addition of graphene causes oxidative damage to microalgae and destruction of the Chlorella cell wall and cell membrane, inhibiting the nitrogen and phosphorus removal in Chlorella reactors. This study provides theoretical and practical support for the safe use of graphene.

scholarly journals Management of wastewater trough theatre

2019 ◽  
Author(s):  
Kristina Tihomirova ◽  
Linda Mezule
Keyword(s):  
Wastewater Treatment ◽  
Teaching Method ◽  
Sewage Treatment ◽  
Student Knowledge ◽  
Cooperation Model ◽  
Treatment Technologies ◽  
Water And Wastewater ◽  
Active Communication ◽  
The University ◽  
Industrial Sewage

Compulsory study course on wastewater treatment and sewage systems contains lectures, classroom calculations, technical project and laboratory practicum. The course is addressing not only the developing skills in wastewater treatment technologies but also provides preparation of professionals that can communicate with institutions involved in water and wastewater sector. Over the years it has been observed that even after receiving the most sophisticated knowledge and highest markings, students often lack skills in practical communication with industry and implementation of theoretical knowledge in praxis. Here we describe student-centred teaching method that is based on the activities that are similar to theatre and allow: (i) the teacher to find and understand the weaker places in student knowledge gained during the semester; (ii) the students to form professional skills during the active communication with colleagues and mentors from industry. The students work in several groups “INDUSTRY”, “MUNICIPALITY” and EXPERTS”, try to find better solution for industrial sewage treatment and cooperation model with the municipality and present their results. After 2 years of the modernisation and adjustment, the training course has created an interest not only from student side but also from the industry representatives that are interested in communication with the new specialists and develop strong contacts with the university.

scholarly journals The Improvement of Pollutant Removal in the Ferric-Carbon Micro-Electrolysis Constructed Wetland by Partial Aeration

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 389 ◽  
Author(s):  
Cheng Dong ◽  
Mengting Li ◽  
Lin-Lan Zhuang ◽  
Jian Zhang ◽  
Youhao Shen ◽  
...  
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Sewage Treatment ◽  
Pollutant Removal ◽  
Functional Genes ◽  
Subsurface Flow Constructed Wetland ◽  
Removal Efficiencies ◽  
Oxidation Efficiency ◽  
Denitrification Process

Subsurface flow constructed wetland (SSFCW) has been applied for wastewater treatment for several decades. In recent years, the combination of ferric-carbon micro-electrolysis (Fe/C-M/E) and SSFCW was proven to be an effective method of multifarious sewage treatment. However, Ferric substrate created a relatively reductive condition, decreased the oxidation efficiency of NH4+-N, and blocked the following denitrification process, which led to the low removal efficiencies of NH4+-N and total nitrogen (TN). In this study, partial aeration was introduced into the ferric-carbon micro-electrolysis SSFCW (Fe/C-M/E CW) system to solve the problem above. The water quality and nitrogen-related functional genes of bacteria on the surface of substrate were measured for mechanism exploration. The results showed that, the removal efficiencies of NH4+-N and total phosphorus (TP) in an aerated Fe/C-M/E CW system were 96.97% ± 6.06% and 84.62% ± 8.47%, much higher than 43.33% ± 11.27% and 60.16% ± 2.95% in the unaerated Fe/C-M/E CW systems. However, the TN removal in Fe/C-M/E CW system was not enhanced by aeration, which could be optimized by extending more anoxic section for denitrification.

scholarly journals Performance of Anaerobic Baffled Reactor for Decentralized Wastewater Treatment in Urban Malang, Indonesia

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 184 ◽  
Author(s):  
Anie Yulistyorini ◽  
Miller Camargo-Valero ◽  
Sukarni Sukarni ◽  
Nugroho Suryoputro ◽  
Mujiyono Mujiyono ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Urban Areas ◽  
Sewage Treatment ◽  
Research Work ◽  
Domestic Wastewater ◽  
Poor Quality ◽  
Pollutant Removal ◽  
Treated Effluent ◽  
The Republic ◽  
The Impact

In order to assess the impact of the Sanitation by Communities (SANIMAS) program for community-led sanitation in Indonesia (established in 2002), this research work was conducted with the aim of characterizing the current performance of anaerobic baffled reactors (ABRs), which were deployed in high numbers for the provision of domestic wastewater treatment in densely populated urban areas in Malang (Indonesia). Small and decentralized sewage treatment facilities serve ≈3% of the total population in Malang, including 89 ABR treatment plants. Our findings reveal that only 14% of the 89 ABRs in Malang have an acceptable performance with regard to pollutant removal and integrity of their building structure, but the majority of them produce a treated effluent of poor quality, according to discharge consents set by the Ministry of Environment and Forestry of the Republic of Indonesia (Regulation No. P.68/2016). Clearly the lack of consistent operation and maintenance practices have had a detrimental effect on these decentralized sewage treatment systems, despite their robustness and buffer capacity to cope with changes in organic and hydraulic loading rates. Urbanization will continue to exert pressure on the provision of sanitation services in lower and middle economies, and the role of decentralized sewage management systems is expected to be prominent in the UN’s Sustainable Development Goals era (2015–2030); however, sustainable service delivery must be conceived beyond the provision of sanitation infrastructure.

A bio-electrochemical membrane system for more sustainable wastewater treatment with MnO2/PANI modified stainless steel cathode and photosynthetic provision of dissolved oxygen by algae

2017 ◽  
Vol 76 (7) ◽  
pp. 1907-1914 ◽  
Author(s):  
Qiao Yang ◽  
Yang Lin ◽  
Lifen Liu ◽  
Fenglin Yang
Keyword(s):  
Stainless Steel ◽  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Electricity Generation ◽  
Sewage Treatment ◽  
Membrane System ◽  
Pollutant Removal ◽  
Treatment Technology ◽  
Membrane Flux ◽  
Sustainable Wastewater Treatment

A competitive sewage treatment technology should meet the standard of water quality requirement and accomplish recovery of potential energy. This study presents such a new system, with coupled membrane bioreactor-microbial fuel cell features, which can not only treat wastewater, but also recovers energy from wastewater by electricity generation, and form a new resource by photosynthesis while providing the dissolved oxygen by algae. Specifically, in the system, the MnO2/polyaniline is used to modify the stainless steel mesh and to function well as system membrane and cathode, with satisfactory filtration and catalysis performance. The system enables continuous wastewater treatment with stable pollutant removal and electricity generation. Under the membrane flux of 119.4 Lm−2 h−1, a maximum power density of 1.2 W m−3 can be achieved, the algae multiply 6.1 times, and satisfactory wastewater treatment effect is achieved.

Study on Wastewater Treatment by Biological Aerated Filter

2010 ◽  
Vol 113-116 ◽  
pp. 1289-1292
Author(s):  
Jun Sheng Li ◽  
Cheng Zhang ◽  
Chun Bo Che ◽  
Jin Long Zuo ◽  
Fang Gu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Operating Conditions ◽  
Biological Aerated Filter ◽  
Pollutants Removal ◽  
Aerated Filter ◽  
Reactor Operating

In order to study the pollutants removal effect, the reactor operating conditions were studied with Biological Aerated Filter　(BAF)　process. The results showed that when HRT was at 8h, the effluent COD and ammonia nitrogen were 37 mg/L and 8.6 mg/L with the aeration flow was 0.3 m3/h, the effluent COD and ammonia nitrogen were 53 mg/L and 12.2 mg/L respectively. And the range of effluent pH is at 6.0-8.8. Furthermore the effluent COD was stable, while the effluent ammonia nitrogen will gradually affect by aeration flow. So the BAF process for residential sewage treatment is feasible.

Treatment Effect of Multilayer Vermifiltration on Living Wastewater

2011 ◽  
Vol 343-344 ◽  
pp. 789-794
Author(s):  
Yin Sheng Li ◽  
Xiu Hong Wang ◽  
Yi Qi Dai ◽  
Jiang Ping Qiu ◽  
Paul Robin ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Treatment Effect ◽  
Sewage Treatment ◽  
Pollutant Removal ◽  
Removal Rates ◽  
Preliminary Results ◽  
Rural Living ◽  
The Future ◽  
Organic Wastewater

Former studies and application of vermifiltration process to organic wastewater treatment has given an affirmative effect for the pollutant removal in wastewater. It could be used for the disperse wastewater treatment, especially for rural living sewage. We developed a new multilayer vermifiltration system in this study, expecting to enhance this ability for the disposal of rural living sewage. The result showed that all the COD, BOD5 and SS values in outflow after vermifiltration could meet GB18918-2002. The removal rates of COD，BOD5 and SS were above 75%, 85% and 90% respectively. The N and P could be partly removed. These preliminary results give a positive prospective for the application of multilayer vermifiltration in rural sewage treatment in the future.

UV treatability test for chemical and petrochemical wastewater

1999 ◽  
Vol 39 (10-11) ◽  
pp. 17-23
Author(s):  
L. Castillo ◽  
H. El Khorassani ◽  
P. Trebuchon ◽  
O. Thomas
Keyword(s):  
Wastewater Treatment ◽  
Pure Oxygen ◽  
Petrochemical Wastewater ◽  
Industrial Sewage ◽  
Petrochemical Industries

There is a tendency to design biological units for chemical or petrochemical wastewater treatment. Some of these treatment plants are even sometimes used for the degradation of any external industrial sewage transported for the purpose. In this case, the decision to accept or refuse the waste must be rapid and sure. The aim of this paper is to propose a new treatability test based on a direct far UV photooxidation of the sample, coupled with a UV spectrophotometric survey of the waste quality. The test has been applied on different samples from chemical and petrochemical industries and the results have been compared to those obtained with more classical tests, as for example, biodegradation tests using either air or pure oxygen. For most of the samples, quite good correlation has been observed between the photooxidation test and biodegradation. The UV treatability test is currently used for checking up on petrochemical wastewater and chemical sewage.

scholarly journals Effects of the inclusion of a mixed Psychrotrophic bacteria strain for sewage treatment in constructed wetland in winter seasons

2018 ◽  
Vol 5 (4) ◽  
pp. 172360 ◽  
Author(s):  
Meizhen Tang ◽  
Zhengtao Li ◽  
Yuewei Yang ◽  
Junfeng Chen ◽  
Jie Jiang
Keyword(s):  
Wastewater Treatment ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Volume Ratio ◽  
Inhibitory Effect ◽  
Ammonia Nitrogen ◽  
Bacterial Suspension ◽  
Control Group ◽  
Optimal Dosage ◽  
Nitrogen And Phosphorus

Constructed wetlands (CWs) have been used globally in wastewater treatment for years. CWs represent an efficient ecological system which is both energy-saving and low in investment for construction and operational cost. In addition, CWs also have the advantage of being easy to operate and maintain. However, the operation of CWs at northern latitudes (both mid and high) is sometimes quite demanding, due to the inhibitory effect of low temperatures that often occur in winter. To evaluate the wastewater treatment performance of a culture of mixed Psychrotrophic bacteria strains in an integrated vertical-flow CW, the removal rates of ammonia nitrogen (NH 3 –N), chemical oxygen demand (COD), nitrite nitrogen ( NO 2 − − N ) , nitrate nitrogen ( NO 3 − − N ) and total phosphorus (TP) were quantified at different bacterial dosages to determine the best bacterial dosage and establish kinetic degradation models of the mixed strains. The bacterial culture was made up of Psychrobacter TM-1, Sphingobacterium TM-2 and Pseudomonas TM-3, mixed together at a volume/volume ratio of 1 : 1 : 1 (at bacterial suspension concentrations of 4.4 × 10 9  ml −1 ). Results showed that the organic pollutants (nitrogen and phosphorus) in the sewage could be efficiently removed by the culture of mixed Psychrotrophic bacteria. The optimal dosage of this mixed bacteria strain was 2.5%, and the treatment efficiency of COD, NH 3 –N, NO 2 − − N , NO 3 − − N , total nitrogen and TP were stable at 91.8%, 91.1%, 88.0%, 93.8%, 94.8% and 95.2%, respectively, which were 1.5, 2.0, 2.1, 1.5, 2.2 and 1.3 times those of the control group. In addition, a pseudo-first-order degradation model was a good fit for the degradation pattern observed for each of these pollutants.

MBR technology: a promising approach for the (pre-)treatment of hospital wastewater

2012 ◽  
Vol 65 (9) ◽  
pp. 1648-1653 ◽  
Author(s):  
S. Beier ◽  
C. Cramer ◽  
C. Mauer ◽  
S. Köster ◽  
H. Fr. Schröder ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Treatment Plant ◽  
Decisive Role ◽  
Health Care Facilities ◽  
Pollutant Removal ◽  
Operating Conditions ◽  
Hospital Wastewater ◽  
Pre Treatment ◽  
Polluted Wastewater ◽  
Trace Pollutants

Membrane bioreactor (MBR) technology is a very reliable and extensively tested solution for biological wastewater treatment. Nowadays, separate treatment of highly polluted wastewater streams especially from hospitals and other health care facilities is currently under investigation worldwide. In this context, the MBR technology will play a decisive role because an effluent widely cleaned up from solids and nutrients is absolutely mandatory for a subsequent further elimination of organic trace pollutants. Taking hospital wastewater as an example, the aim of this study was to investigate to what extent MBR technology is an adequate ‘pre-treatment’ solution for further elimination of trace pollutants. Therefore, we investigated – within a 2-year period – the performance of a full-scale hospital wastewater treatment plant (WWTP) equipped with a MBR by referring to conventional chemical and microbiological standard parameters. Furthermore, we measured the energy consumption and tested different operating conditions. According to our findings the MBR treatment of the hospital wastewater was highly efficient in terms of the removal of solids and nutrients. Finally, we did not observe any major adverse effects on the operation and performance of the MBR system which potentially could derive from the composition of the hospital wastewater. In total, the present study proved that MBR technology is a very efficient and reliable treatment approach for the treatment of highly polluted wastewater from hospitals and can be recommended as a suitable pre-treatment solution for further trace pollutant removal.

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