scholarly journals Current Trends on Role of Biological Treatment in Integrated Treatment Technologies of Textile Wastewater

2021 ◽  
Vol 12 ◽  
Author(s):  
Maria Belen Ceretta ◽  
Débora Nercessian ◽  
Erika A. Wolski
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Membrane Filtration ◽  
Textile Wastewater ◽  
Integrated Treatment ◽  
Biological Processes ◽  
Wastewater Discharge ◽  
High Concentration ◽  
Treatment Technologies ◽  
Hazardous Compounds

Wastewater discharge is a matter of concern as it is the primary source of water pollution. Consequently, wastewater treatment plays a key role in reducing the negative impact that wastewater discharge produce into the environment. Particularly, the effluents produced by textile industry are composed of high concentration of hazardous compounds such as dyes, as well as having high levels of chemical and biological oxygen demand, suspended solids, variable pH, and high concentration of salt. Main efforts have been focused on the development of methods consuming less water or reusing it, and also on the development of dyes with a better fixation capacity. However, the problem of how to treat these harmful effluents is still pending. Different treatment technologies have been developed, such as coagulation-flocculation, adsorption, membrane filtration, reverse osmosis, advanced oxidation, and biological processes (activated sludge, anaerobic-aerobic treatment, and membrane bioreactor). Concerning to biological treatments, even though they are considered as the most environmentally friendly and economic methods, their industrial application is still uncertain. On the one hand, this is due to the costs of treatment plants installation and, on the other, to the fact that most of the studies are carried out with simulated or diluted effluents that do not represent what really happens in the industries. Integrated treatment technologies by combining the efficiency two or more methodologies used to be more efficient for the decontamination of textile wastewater, than treatments used separately. The elimination of hazardous compounds had been reported using combination of physical, chemical, and biological processes. On this way, as degradation products can sometimes be even more toxic than the parent compounds, effluent toxicity assessment is an essential feature in the development of these alternatives. This article provides a critical view on the state of art of biological treatment, the degree of advancement and the prospects for their application, also discussing the concept of integrated treatment and the importance of including toxicity assays to reach an integral approach to wastewater treatment.

Use of chemical upgrading (CU) in Hungary and Slovakia

1994 ◽  
Vol 30 (5) ◽  
pp. 87-95 ◽  
Author(s):  
Susan E. Murcott ◽  
Donald R. F. Harleman
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Domestic Sewage ◽  
Metal Salts ◽  
Plant Performance ◽  
Eastern European ◽  
Low Doses ◽  
The Past ◽  
Treatment Technologies

In the past decade, the development of polymers and new chemical technologies has opened the way to using low doses of chemicals in wastewater treatment. “Chemical upgrading” (CU) is defined in this paper as an application of these chemical technologies to upgrade overloaded treatment systems (typically consisting of conventional primary plus biological treatment) in Central and Eastern European (CEE) countries. Although some of the chemical treatment technologies are proven ones in North America, Scandinavia, and Germany, a host of factors, for example, the variations in composition and degree of pollution, the type of technologies in use, the type and mix of industrial and domestic sewage, and the amount of surface water, had meant that the viability of using CU in CEE countries was unknown. This report describes the first jar tests of CU conducted during the summer of 1993. The experiments show CU's ability to improve wastewater treatment plant performance and to potentially assist in the significant problem of overloaded treatment plants. Increased removal of BOD, TSS, and P in the primary stage of treatment is obtained at overflow rates above 1.5 m/h, using reasonably priced, local sources of metal salts in concentrations of 25 to 50 mg/l without polymers.

scholarly journals ANALYSIS OF PHYSICOCHEMICAL WASTEWATER TREATMENT IN ARCTIC ZONES

2020 ◽  
Vol 22 (1) ◽  
pp. 152-163
Author(s):  
E. I. Vialkova ◽  
E. S. Glushchenko ◽  
T. S. Velizhanina ◽  
E. Y. Osipova
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Wastewater Discharge ◽  
Total Change ◽  
Climatic Zones ◽  
Physicochemical Treatment ◽  
Treatment Facilities ◽  
The Russian Federation ◽  
Sewage Systems ◽  
Design Construction

The large part of the Russian Federation locates in arctic and subarctic climatic zones, which determine the specificity of design, construction and operation of sewage systems of these regions. Nowadays, the most part of small Arctic towns has no wastewater treatment facilities, while the available biological treatment facilities do not work properly. An alternative way is physicochemical treatment, which is more resistant to severe climate and volley wastewater discharge than biological treatment. The paper presents the research results of total change the biological into physicochemical treatment. The main stages of such a treatment include coagulation, filtration, oxidation and two-stage filtration (mechanical and absorption). The experiments show a 90.8% decrease in the concentration of chemical oxygen and a 74% and 82.5% decrease in nitrates and ammonium.

scholarly journals Perspectives on Microalgal Biofilm Systems with Respect to Integration into Wastewater Treatment Technologies and Phosphorus Scarcity

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2245
Author(s):  
Kateřina Sukačová ◽  
Daniel Vícha ◽  
Jiří Dušek
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
New Technologies ◽  
Wastewater Treatment Plants ◽  
Phosphorus Uptake ◽  
Phosphorus Recovery ◽  
Practical Application ◽  
High Concentration ◽  
Water Ecosystem ◽  
Treatment Technologies

Phosphorus is one of the non-renewable natural resources. High concentration of phosphorus in surface water leads to undesirable eutrophication of the water ecosystem. It is therefore necessary to develop new technologies not only for capturing phosphorus from wastewater but also for phosphorus recovery. The aim of the study was to propose three different integration scenarios for a microalgal biofilm system for phosphorus removal in medium and small wastewater treatment plants, including a comparison of area requirements, a crucial factor in practical application of microalgal biofilm systems. The area requirements of a microalgal biofilm system range from 2.3 to 3.2 m2 per person equivalent. The total phosphorus uptake seems to be feasible for construction and integration of microalgal biofilm systems into small wastewater treatment plants. Application of a microalgal biofilm for phosphorus recovery can be considered one of the more promising technologies related to capturing CO2 and releasing of O2 into the atmosphere.

Characteristics of developed granules containing selected decolourising bacteria for the degradation of textile wastewater

2010 ◽  
Vol 61 (5) ◽  
pp. 1279-1288 ◽  
Author(s):  
Z. Ibrahim ◽  
M. F. M. Amin ◽  
A. Yahya ◽  
A. Aris ◽  
K. Muda
Keyword(s):  
Biological Treatment ◽  
Morphological Characteristics ◽  
Industrial Effluents ◽  
Textile Wastewater ◽  
Treatment Method ◽  
Current Treatment ◽  
Volume Index ◽  
Biological Processes ◽  
Initial Ranging ◽  
Maximum Removal

Textile wastewater, one of the most polluted industrial effluents, generally contains substantial amount of dyes and chemicals that will cause increase in the COD, colour and toxicity of receiving water bodies if not properly treated. Current treatment methods include chemical and biological processes; the efficiency of the biological treatment method however, remains uncertain since the discharged effluent is still highly coloured. In this study, granules consisting mixed culture of decolourising bacteria were developed and the physical and morphological characteristics were determined. After the sixth week of development, the granules were 3–10 mm in diameter, having good settling property with settling velocity of 70 m/h, sludge volume index (SVI) of 90 to 130 mL/g, integrity coefficient of 3.7, and density of 66 g/l. Their abilities to treat sterilised raw textile wastewater were evaluated based on the removal efficiencies of COD (initial ranging from 200 to 3,000 mg/L), colour (initial ranging from 450 to 2000 ADMI) of sterilised raw textile wastewater with pH from 6.8 to 9.4. Using a sequential anaerobic-aerobic treatment cycle with hydraulic retention time (HRT) of 24 h, maximum removal of colour and COD achieved was 90% and 80%, respectively.

An Instance about Juice Wastewater Treatment with UASB and Bio-Contact Oxidation and Coagulation and Floatation Process

2012 ◽  
Vol 550-553 ◽  
pp. 2108-2111
Author(s):  
Hai Jing Yu ◽  
Hezhang Li
Keyword(s):  
Wastewater Treatment ◽  
Removal Rate ◽  
Wastewater Discharge ◽  
High Concentration ◽  
Contact Oxidation ◽  
Operation Results ◽  
Floatation Process ◽  
Organic Wastewater

Abstract. UASB, bio-contact oxidation, coagulation and floating process was adopted in treatment of juice wastewater. Operation results show that when the main pollutants of COD, BOD and SS in the influent were 6033 mg•L-1, 2512 mg•L-1 and 2200mg•L-1, the effluent could reach 63 mg•L-1, 25 mg•L-1 and 29 mg•L-1, respectively, with the removal rate of 99.0 %, 99.0 %, 98.7 %. The effluent reached the I-class criteria specified in Integrated Wastewater Discharge Standard (GB8978-1996) (COD < 60 mg•L-1, BOD < 20 mg•L-1, SS < 20 mg•L-1). The process provides a practical reference for the similar high concentration organic wastewater treatment processing.

scholarly journals CHALLENGES IN TEXTILE WASTEWATER AND CURRENT PALLIATIVE METHODS: AN OVERVIEW

2017 ◽  
Vol 18 (2) ◽  
pp. 71-78
Author(s):  
Ibrahim Adebayo Bello
Keyword(s):  
Oxygen Demand ◽  
Textile Wastewater ◽  
Wastewater Management ◽  
Textile Dye ◽  
Biological Processes ◽  
Dye Wastewater ◽  
High Concentration ◽  
Efficient Treatment ◽  
The Past ◽  
Textile Industries

Effluents from dye and textile industries are highly contaminated and toxic to the environment. High concentration of non-biodegradable compounds contributes to increased biochemical oxygen demand (BOD) and chemical oxygen demand (COD) of the wastewater bodies.  Dyes found in wastewater from textile industries are carcinogenic, mutagenic or teratogenic. Biological processes involving certain bacteria, fungi, activated carbon and carbon nanotubes (CNTs) are promising methods for treating the waste water. These methods are either inefficient or ineffective.  These complexities necessitates search for new approaches that will offset all the shortcomings of the present solutions to the challenges faced with textile wastewater management. This article reviews the past and recent methods used in the treatment of the textile dye wastewater and the future opportunities for efficient treatment of textiles wastewaters.

Conventional Wastewater Treatments

2020 ◽  
pp. 220-259
Keyword(s):  
Wastewater Treatment ◽  
Biological Processes ◽  
Organic Loading ◽  
Nutrient Contents ◽  
Industrial Activities ◽  
Treatment Technologies ◽  
Aerobic And Anaerobic ◽  
Conventional Wastewater Treatment

Conventional wastewater treatment consists of chemical, biological, physicochemical, and mechanical processes to remove organic loading, solids, and nutrient contents from wastewater. Biological processes are more commonly used in wastewater treatment as secondary or tertiary treatments, as it is more effective and more economical than chemical and mechanical processes. In this chapter, several types of wastewaters generated from municipal or industrial activities are discussed. Wastewater has different pollutant contents depending on the point of generation which consequently requires different ways of treatment. Some commonly used conventional wastewater treatment technologies are introduced. A particular focus is given to both aerobic and anaerobic treatments.

scholarly journals Application of yeast in the wastewater treatment

2018 ◽  
Vol 53 ◽  
pp. 04025 ◽  
Author(s):  
Yan Wang ◽  
Liping Qiu ◽  
Mengfei Hu
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Metal Ion ◽  
Enzyme System ◽  
Domestic Sewage ◽  
The Body ◽  
High Concentration ◽  
Gene Engineering ◽  
Immobilization Technology ◽  
Basic Characteristics

Yeast, as a very valuable microbial resource, has a good enzyme system in the body and can adapt to a variety of special environments. Therefore, it plays an important role in the biological treatment of wastewater. The classification and basic characteristics of yeast were introduced, and the application of yeast in the field of wastewater treatment such as high concentration organic wastewater, heavy metal ion wastewater and domestic sewage were summarized. With the mature of yeast technology and the development of science and technology, more techniques such as gene engineering and immobilization technology will be used to treat with yeast, so that it will have a wider application prospect in wastewater treatment.

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