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.

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.

Study on BAF Lipid Phosphorus Biomass and SOUR Active Tests

2012 ◽  
Vol 468-471 ◽  
pp. 2437-2440
Author(s):  
Xin Gang Yu ◽  
En Shen Wu ◽  
Zeng Min Han
Keyword(s):  
Wastewater Treatment ◽  
High Efficiency ◽  
Sewage Treatment ◽  
Stable Operation ◽  
Lipid Phosphorus ◽  
Treatment Technology ◽  
The Operating Mechanism ◽  
Living Organisms ◽  
Aerated Filter ◽  
Suspended Matters

By taking the fillings from the wastewater treatment reactor of a practically stable operation of the BAF, it is to test the lipid phosphorus biomass both in the bio-film and floc in the fillings, and active changing laws of microbes. The experiments show that BAF sewage treatment results from the joint action of bio-film and biological floc. The experiments provide theoretical foundations for the operating mechanism of BAF, packing height and the optimization of backwash time. Due to its high efficiency, energy saving, small area, easy operation and management, Biological Aerated Filter (BAF) technology has become a research focus[1] of a biological wastewater treatment technology in recent years. BAF process is characterized of a lot of filler in the activated sludge, besides the bio-film on the fillings. This sludge contains active living organisms, shed bio-film, suspended matters from the raw sewage and other adsorptions from the wastewater. They are collectively referred to as biological floc. When oxidating and decomposing organic matters in the sewage, it intercepts and adsorb sunken substances. Throughout BAF operation process, it is as irreplaceable as the bio-film.

Sustainable Wastewater Treatment Technologies Based on Resource Recovery and Energy Utilization

2014 ◽  
Vol 955-959 ◽  
pp. 2060-2064
Author(s):  
Zhao Han Zhang ◽  
Li Jun Xiang ◽  
Qiu Yan Zou ◽  
Yu Jie Feng ◽  
Pei Rong Zhan
Keyword(s):  
Wastewater Treatment ◽  
Resource Recovery ◽  
Energy Utilization ◽  
Treatment Technology ◽  
Existing Problems ◽  
Treatment Models ◽  
Treatment Technologies ◽  
Production Technologies ◽  
Development Orientation ◽  
Sustainable Wastewater Treatment

In the context of global sustainable development, traditional wastewater treatment models reveal its shortcomings due to lack of recovering resource and energy in wastewater. Sustainable wastewater treatment technologies, taken wastewater as carriers of resource and energy, have been paid close attention. Starting from the existing problems of present wastewater treatment technology and focusing on the concept of resource recovery and energy utilization, this paper discussed the production technologies for hydrogen, electricity, diesel and methane from wastewater based on carbon resource recovery, and nitrogen resource treatment technologies with low energy consumption (such as shortcut nitrification-denitrification, ANAMMOX and SND). The latest research processes were also summarized. The research and development orientation of sustainable treatment technology for urban wastewater was put forward.

scholarly journals Effect of vibration on the efficiency of ultrafiltration

2021 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
Szabolcs Gyula Szerencsés ◽  
Sándor Beszédes ◽  
Zsuzsanna László ◽  
Gábor Veréb ◽  
Balázs Szegedi ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Energy Demand ◽  
Membrane Filtration ◽  
The European Union ◽  
Treatment Technology ◽  
Filtration Resistance ◽  
Filtration System ◽  
Total Filtration ◽  
Sustainable Wastewater Treatment

Nowadays, several environmental challenges are present to cope with. One with outstanding importance is the protection of our water supplies, therefore examination of wastewater treatment technology is a priority, especially in the European Union. In this work, the effect of membrane module vibration amplitude on the efficiency of ultrafiltration (UF) was investigated in a vibratory shear enhanced membrane filtration system. Based on the results of model dairy effluent UF and statistical analysis, the maximum vibration level available resulted in the most efficient filtration process, due to the most significant reduction of membrane fouling. From our results it was observed that the permeate fluxes more than doubled, specific energy demand was roughly halved, with almost identical retentions for organic matter, and total filtration resistance was reduced to less than half. Results also showed that setting the optimal operating parameters, an advantageous, efficiency focused, and sustainable wastewater treatment technology can be established.

scholarly journals Does influent C/N ratio affect pollutant removal and greenhouse gas emission in wastewater ecological soil infiltration systems with/without intermittent aeration?

2020 ◽  
Vol 81 (4) ◽  
pp. 668-678
Author(s):  
Junling Pang ◽  
Mo Yang ◽  
Deli Tong ◽  
Xu Fu ◽  
Linli Huang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Greenhouse Gas Emission ◽  
N2o Emission ◽  
Pollutant Removal ◽  
Emission Rates ◽  
Intermittent Aeration ◽  
Ghg Emission ◽  
Soil Infiltration ◽  
Treatment Technology ◽  
Ch4 And N2o

Abstract Wastewater ecological soil infiltration system (WESIS) is a land treatment technology for decentralized wastewater treatment that has been applied all over the world. In this study, the pollutant removal, emission of greenhouse gases (GHGs) and functional gene abundances with different influent C/N ratios were evaluated in WESISs with/without intermittent aeration. Intermittent aeration and influent C/N ratio affect pollutant removal and GHG emission. Increased influent C/N ratio led to high total nitrogen (TN) removal, low CH4 and N2O emission in the aerated WESIS, which was different from the non-aerated WESIS. High average removal efficiencies of chemical oxygen demand (COD) (94.8%), NH4+-N (95.1%), TN (91.2%), total phosphorus (TP) (91.1%) and low emission rates for CH4 (27.2 mg/(m2 d)) and N2O (10.5 mg/(m2 d)) were achieved with an influent C/N ratio of 12:1 in the aerated WESIS. Intermittent aeration enhanced the abundances of bacterial 16S rRNA, amoA, nxrA, narG, napA, nirK, nirS, qnorB, nosZ genes and decreased the abundances of the mcrA gene, which are involved in pollutant removal and GHG emission. Intermittent aeration would be an effective alternative to achieving high pollutant removal and low CH4 and N2O emission in high influent C/N ratio wastewater treatment.

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.

scholarly journals Evaluation of microbial fuel cell (MFC) for bioelectricity generation and pollutants removal from sugar beet processing wastewater (SBPW)

2017 ◽  
Vol 77 (2) ◽  
pp. 387-397 ◽  
Author(s):  
Atikur Rahman ◽  
Md Saidul Borhan ◽  
Shafiqur Rahman
Keyword(s):  
Wastewater Treatment ◽  
Sugar Beet ◽  
Microbial Fuel Cells ◽  
Electricity Generation ◽  
Coulombic Efficiency ◽  
Pollutant Removal ◽  
Microbial Consortia ◽  
Anode Chamber ◽  
Batch Mode ◽  
Bioelectricity Generation

AbstractBioelectricity generation from biodegradable compounds using microbial fuel cells (MFCs) offers an opportunity for simultaneous wastewater treatment. This study evaluated the synergy of electricity generation by the MFC while reducing pollutants from sugar beet processing wastewater (SBPW). A simple dual-chamber MFC was constructed with inexpensive materials without using catalysts. Raw SBPW was diluted to several concentrations (chemical oxygen demand (COD) of 505 to 5,750 mg L−1) and fed as batch-mode into the MFC without further modification. A power density of 14.9 mW m−2 as power output was observed at a COD concentration of 2,565 mg L−1. Coulombic efficiency varied from 6.21% to 0.73%, indicating diffusion of oxygen through the cation exchange membrane and other methanogenesis and fermentation processes occurring in the anode chamber. In this study, >97% of the COD and up to 100% of the total suspended solids removals were observed from MFC-treated SBPW. Scanning electron microscopy of anode indicated that a diverse community of microbial consortia was active for electricity generation and wastewater treatment. This study demonstrated that SBPW can be used as a substrate in the MFC to generate electricity as well as to treat for pollutant removal.

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.

Engineering Design of CAST Process for a Small Town Wastewater Treatment

2013 ◽  
Vol 807-809 ◽  
pp. 1245-1250
Author(s):  
Jing Li Gu ◽  
Jun Hong ◽  
Ling Wan ◽  
Fan Zhang ◽  
Nan Nan Yuan
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Municipal Wastewater ◽  
Small Town ◽  
Sewage Treatment ◽  
Industrial Effluent ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Treatment Technology ◽  
Effluent Quality

A process of CAST, designing parameters and characteristics in the water treatment technology was introduced in this paper. The CAST was adopted to treat a scale of 3300m3/d of municipal wastewater and industrial effluent coming from a small town of Huojia county in Henan province. It is an innovative attempt to applied the CAST to a rural sewage treatment in the traditional water treatment field. What is more , after the chemical phosphorus removal and a sufficient reaction in the CAST tank, the effluent quality would ultimately meet level A while others could only meet level B in the state standard discharge standard of pollutants for municipal wastewater treatment plant (GB 18919-2002).

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.

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