scholarly journals Loofah Sponges as Bio-Carriers in a Pilot-Scale Integrated Fixed-Film Activated Sludge System for Municipal Wastewater Treatment

2020 ◽  
Vol 12 (11) ◽  
pp. 4758
Author(s):  
Huyen T.T. Dang ◽  
Cuong V. Dinh ◽  
Khai M. Nguyen ◽  
Nga T.H. Tran ◽  
Thuy T. Pham ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Agricultural Product ◽  
Aeration Tank ◽  
Municipal Wastewater Treatment ◽  
Treatment Processes ◽  
Fixed Film ◽  
The Cost

Fixed-film biofilm reactors are considered one of the most effective wastewater treatment processes, however, the cost of their plastic bio-carriers makes them less attractive for application in developing countries. This study evaluated loofah sponges, an eco-friendly renewable agricultural product, as bio-carriers in a pilot-scale integrated fixed-film activated sludge (IFAS) system for the treatment of municipal wastewater. Tests showed that pristine loofah sponges disintegrated within two weeks resulting in a decrease in the treatment efficiencies. Accordingly, loofah sponges were modified by coating them with CaCO3 and polymer. IFAS pilot tests using the modified loofah sponges achieved 83% organic removal and 71% total nitrogen removal and met Vietnam’s wastewater effluent discharge standards. The system achieved considerably high levels of nitrification and it was not limited by the loading rate or dissolved oxygen levels. Cell concentrations in the carriers were twenty to forty times higher than those within the aeration tank. Through 16S-rRNA sequencing, the major micro-organism types identified were Kluyvera cryocrescens, Exiguobacterium indicum, Bacillus tropicus, Aeromonas hydrophila, Enterobacter cloacae, and Pseudomonas turukhanskensis. This study demonstrated that although modified loofah sponges are effective renewable bio-carriers for municipal wastewater treatment, longer-term testing is recommended.

scholarly journals Innovative technologies in municipal wastewater treatment plants in Sweden to improve Baltic Sea water quality

2018 ◽  
Vol 45 ◽  
pp. 00113 ◽  
Author(s):  
Józef Trela ◽  
Elżbieta Płaza
Keyword(s):  
Wastewater Treatment ◽  
Baltic Sea ◽  
Municipal Wastewater ◽  
New Technologies ◽  
Sea Water ◽  
Wastewater Treatment Plants ◽  
Pilot Scale ◽  
Municipal Wastewater Treatment ◽  
Treatment Processes ◽  
Municipal Wastewater Treatment Plants

The article presents new trends in the treatment of municipal wastewater in Sweden caused by the constantly increasing requirements for discharging pollutants into Baltic Sea waters. The development of new technologies for nitrogen removal, pharmaceutical residues removal and the possibility of using membrane processes in wastewater treatment is presented. The state of research on innovative wastewater treatment processes at the level of pilot-scale tests and their implementation in full technical scale has been described. These technologies can allow the application of new, economical and environmentally friendly wastewater treatment processes based on biological, chemical and physical methods. Swedish wastewater treatment plants are preparing to meet the new conditions required for discharged wastewater with a value of 6 mg N/L for total nitrogen and 0.2 mg P/L for total phosphorus. This requires large investments in the reconstruction of municipal wastewater treatment plants and the introduction of new treatment processes.

Kinetic Model of Sequencing Batch Activated Sludge Process for Municipal Wastewater Treatment

1991 ◽  
Vol 23 (4-6) ◽  
pp. 1097-1106 ◽  
Author(s):  
H. Nakazawa ◽  
K. Tanaka
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Model ◽  
Activated Sludge ◽  
Mathematical Models ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Operational Conditions ◽  
Aeration Time

Mathematical models based on the kinetic aspect of the sequencing batch activated sludge process were developed to explain the characteristics of the process treating municipal wastewater. These models are a steady-state model dealing with the overall relationship between biomass concentrations in a reactor and operational conditions of the process, and a kinetic model dealing with the behaviors of biomass and substrate in a reactor within one cycle time of the process. Applying these mathematical models for the results of pilot-scale experiments for municipal wastewater treatment, reasonable parameters' values were obtained and the effects of operating strategies including the aeration time ratio and the solids retention time became clear for the process performance.

Перспективная технология очистки коммунальных сточных вод гранулированными илами

2019 ◽  
pp. 34-44
Author(s):  
M. Kevbrina ◽  
A. Akmentina ◽  
A. Dorofeev ◽  
A. Agarev ◽  
V. Aseeva ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Aeration Tank ◽  
Municipal Wastewater Treatment ◽  
Treatment Technology ◽  
Maximum Permissible Concentrations

Увеличение удельной биохимической мощности сооружений с применением так называемых гранулированных активных илов является одним из перспективных направлений развития технологий биологической очистки сточных вод. Гранулированные илы это микробные биоценозы, специализирующиеся на разложении и минерализации веществ, содержащихся в сточных водах. Отличие от обычных илов обусловлено двумя важными факторами: строением основной структурной единицы гранулированного ила гранулы, и высокой скоростью осаждения (до 20 м/ч). Это позволяет создавать в биореакторах очистки сточных вод дозы ила до 10 г/л. Представлены результаты разработки первой в РФ биотехнологии очистки городских сточных вод с применением гранулированного активного ила. Технология реализована на объектах АО Мосводоканал . Технология аэробной биологической очистки в реакторе последовательнопериодического действия с последовательной нитриденитрификацией и восходящим потоком сточной воды позволяет обеспечить качество очищенной воды, соответствующее нормативам предельно допустимых концентраций для сброса в водоемы рыбохозяйственного назначения. Техникоэкономическое сравнение разработанной технологии с технологией удаления биогенных элементов в аэротенке проточного типа показало, что затраты жизненного цикла сооружений с частично гранулированным активным илом в 1,4 раза меньше затрат традиционной технологии биологической очистки (для производительности 1000 м3/сут).Increasing the specific biochemical capacity of the facilities using the socalled granular activated sludge is one of the promising areas for the development of biological wastewater treatment technologies. Granular sludge is microbial biocenosis specializing in the decomposition and mineralization of substances present in wastewater. The main distinction from regular sludge is due to two important factors: the composition of the basic structural unit of granular sludge granules, and a high sedimentation rate (up to 20 m/h). This provides for developing sludge doses of up to 10 g/l in bioreactors of wastewater treatment. The results of the development of the first biotechnology in Russia for municipal wastewater treatment of using granular activated sludge are presented. The technology has been implemented at the facilities of Mosvodokanal JSC. The technology of aerobic biological treatment in a sequencing batch reactor with sequential nitridenitrification and an upward flow of wastewater provides for the quality of effluent that meets the standards for maximum permissible concentrations for discharge into fishery bodies. Technical and economic comparison of the developed technology with the technology of removing nutrients in flowthrough aeration tank showed that the life cycle costs of the facilities with partially granulated activated sludge are 1.4 times less than the costs of traditional biological treatment technology (for a capacity of 1000 m3/day).

Occurrence and efficacy of bisphenol A (BPA) treatment in selected municipal wastewater treatment plants, Bangkok, Thailand

2015 ◽  
Vol 72 (3) ◽  
pp. 463-471 ◽  
Author(s):  
Intira Pookpoosa ◽  
Ranjna Jindal ◽  
Daisy Morknoy ◽  
Kraichat Tantrakarnapa
Keyword(s):  
Wastewater Treatment ◽  
Bisphenol A ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Nutrients Removal ◽  
Municipal Wastewater Treatment ◽  
Treatment Processes ◽  
Municipal Wastewater Treatment Plants

Investigations were carried out on the occurrence and fate of bisphenol A (BPA) in five wastewater treatment plants (WWTPs) in Bangkok, namely, Rattanakosin, Chong Non Si, Din Daeng (DD), Nong Khaem and Thungkru (TK) during three sampling events between October 2013 and February 2014. Based on the results, the influent and effluent BPA concentrations ranged between 128.5 ng/L and 606.0 ng/L; and 38.7 ng/L and 270.5 ng/L, respectively. The effluent BPA concentrations of most of the five WWTPs were lower than the influent levels. TK had the highest removal efficiency in October 2013 (80.4%) and December 2013 (90.7%) and the second highest in February 2014 (69.2%). DD had the highest removal efficiency in February 2014 (91.8%). The treatment processes employed at TK and DD were vertical loop reactor activated sludge process and activated sludge with nutrients removal, respectively. Thus, these processes seem to be good for BPA degradation.

scholarly journals Polyhydroxyalkanoate (PHA) production from sludge and municipal wastewater treatment

2013 ◽  
Vol 69 (1) ◽  
pp. 177-184 ◽  
Author(s):  
F. Morgan-Sagastume ◽  
F. Valentino ◽  
M. Hjort ◽  
D. Cirne ◽  
L. Karabegovic ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Storage Capacity ◽  
Waste Treatment ◽  
Pilot Scale ◽  
Municipal Wastewater Treatment ◽  
Solid Waste Treatment ◽  
Pha Production ◽  
Eu Project

Polyhydroxyalkanoates (PHAs) are biodegradable polyesters with comparable properties to some petroleum-based polyolefins. PHA production can be achieved in open, mixed microbial cultures and thereby coupled to wastewater and solid residual treatment. In this context, waste organic matter is utilised as a carbon source in activated sludge biological treatment for biopolymer synthesis. Within the EU project Routes, the feasibility of PHA production has been evaluated in processes for sludge treatment and volatile fatty acid (VFA) production and municipal wastewater treatment. This PHA production process is being investigated in four units: (i) wastewater treatment with enrichment and production of a functional biomass sustaining PHA storage capacity, (ii) acidogenic fermentation of sludge for VFA production, (iii) PHA accumulation from VFA-rich streams, and (iv) PHA recovery and characterisation. Laboratory- and pilot-scale studies demonstrated the feasibility of municipal wastewater and solid waste treatment alongside production of PHA-rich biomass. The PHA storage capacity of biomass selected under feast–famine with municipal wastewater has been increased up to 34% (g PHA g VSS−1) in batch accumulations with acetate during 20 h. VFAs obtained from waste activated sludge fermentation were found to be a suitable feedstock for PHA production.

Integration of membrane filtration into the activated sludge process in municipal wastewater treatment

1998 ◽  
Vol 38 (4-5) ◽  
pp. 429-436 ◽  
Author(s):  
N. Engelhardt ◽  
W. Firk ◽  
W. Warnken
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Pilot Plant ◽  
Membrane Filtration ◽  
Large Scale ◽  
Municipal Wastewater ◽  
Aeration Tank ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
New Process

Energy-efficient membrane modules for microfiltration are available to realize a new process engineering in municipal wastewater treatment. The microfiltration membrane ensures that all microorganisms are retained in the aeration tank. A content of mixed-liquor suspended solids of e.g. 15 gMLSS/l can easily be achieved in a large scale plant. Thus the aeration tank is considerably reduced in size. A secondary clarifier is no longer needed. A filtration and a disinfection can be dismissed. A pilot plant gives first knowledge on the application of the activated sludge process with submersed membrane filtration. Based on the tests' results and the knowledge gained during the operation of the pilot plant, a WWTP with membrane filtration for 3000 inhabitants is designed. The costs of investment and operation are estimated.

STUDIES REGARDING THE PERFORMANCES OF MUNICIPAL WASTEWATER TREATMENT PROCESSES

2006 ◽  
Vol 5 (4) ◽  
pp. 685-692
Author(s):  
Elisabeta Chirila ◽  
Ionela Carazeanu Popovici ◽  
Techin Ibadula ◽  
Alice Iordache
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Treatment Processes
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