scholarly journals Preparation, Performances, and Mechanisms of Microbial Flocculants for Wastewater Treatment

2020 ◽  
Vol 17 (4) ◽  
pp. 1360 ◽  
Author(s):  
Huiru Li ◽  
Shaohua Wu ◽  
Cheng Du ◽  
Yuanyuan Zhong ◽  
Chunping Yang
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Suspended Solids ◽  
Current Status ◽  
Future Research ◽  
Research Needs ◽  
Close Attention ◽  
Charge Neutrality ◽  
Environmental Friendliness ◽  
Preparation Methods

In recent years, close attention has been paid to microbial flocculants because of their advantages, including safety to humans, environmental friendliness, and acceptable removal performances. In this review, the preparation methods of microbial flocculants were first reviewed. Then, the performances of bioflocculants in the removal of suspended solids, heavy metals, and other organic pollutants from various types of wastewater were described and commented, and the removal mechanisms, including adsorption bridging, charge neutralization, chemical reactions, and charge neutrality, were also discussed. The future research needs on microbial flocculants were also proposed. This review would lead to a better understanding of current status, challenges, and corresponding strategies on microbial flocculants and bioflocculation in wastewater treatment.

scholarly journals Microbial Flocculants as an Alternative to Synthetic Polymers for Wastewater Treatment: A Review

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 556 ◽  
Author(s):  
Faouzi Ben Rebah ◽  
Wissem Mnif ◽  
Saifeldin M. Siddeeg
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Suspended Solids ◽  
Specific Resistance ◽  
Oxygen Demand ◽  
Synthetic Polymers ◽  
Operating Parameters ◽  
Flocculating Activity ◽  
Microbial Strains ◽  
Active Substances

Microorganisms such as bacteria, fungi, and microalgae have been used to produce bioflocculants with various structures. These polymers are active substances that are biodegradable, environmentally harmless, and have flocculation characteristics. Most of the developed microbial bioflocculants displayed significant flocculating activity (FA > 70–90%) depending on the strain used and on the operating parameters. These biopolymers have been investigated and successfully used for wastewater depollution in the laboratory. In various cases, selected efficient microbial flocculants could reduce significantly suspended solids (SS), turbidity, chemical oxygen demand (COD), total nitrogen (Nt), dye, and heavy metals, with removal percentages exceeding 90% depending on the bioflocculating materials and on the wastewater characteristics. Moreover, bioflocculants showed acceptable results for sludge conditioning (accepted levels of dry solids, specific resistance to filtration, moisture, etc.) compared to chemicals. This paper explores various bioflocculants produced by numerous microbial strains. Their production procedures and flocculating performance will be included. Furthermore, their efficiency in the depollution of wastewater will be discussed.

scholarly journals Recovery of Uranium from Seawater: A Review of Current Status and Future Research Needs

2013 ◽  
Vol 48 (3) ◽  
pp. 367-387 ◽  
Author(s):  
Jungseung Kim ◽  
Costas Tsouris ◽  
Richard T. Mayes ◽  
Yatsandra Oyola ◽  
Tomonori Saito ◽  
...  
Keyword(s):  
Current Status ◽  
Future Research ◽  
Research Needs ◽  
Uranium From Seawater

Advances in Preparation of Activated Carbon from Sugarcane Bagasse and Using it to Treatment of Wastewater Research

2014 ◽  
Vol 1010-1012 ◽  
pp. 15-19
Author(s):  
Yan Min Qin ◽  
Mei Na Liang ◽  
Dun Qiu Wang
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Organic Pollutants ◽  
Sugarcane Bagasse ◽  
Industrial Wastewater ◽  
Research Progress ◽  
Future Research ◽  
Preparation Methods ◽  
Existing Problems

This paper discusses the utilization situation and existing problems of sugarcane bagasse, and briefly the research progress of preparation of activated carbon from sugarcane bagasse (ACSB). It reviews the application of activated carbon prepared from sugarcane bagasse, such as, industrial wastewater decolorizing, removal of organic pollutants and heavy metals in wastewater in the domestic and overseas in recent years. Points out the shortage of preparation methods, the existing problems and puts forwards some questions need to be solved in future research. Moreover, the prospect of application and the trends in future research of activated carbon from sugarcane bagasse are proposed.

scholarly journals Carwash Wastewater Treatment by Electrocoagulation Using Aluminum Foil Electrodes

2019 ◽  
Vol 25 (10) ◽  
pp. 50-60
Author(s):  
Israa Mawlood Atiyah ◽  
Basma Abbas Abdul-Majeed
Keyword(s):  
Heavy Metals ◽  
Electrical Conductivity ◽  
Wastewater Treatment ◽  
Thin Layer ◽  
Removal Efficiency ◽  
Suspended Solids ◽  
Treatment Process ◽  
Treatment Time ◽  
Aluminum Foil ◽  
Total Dissolved Solids

Large quantities of contaminated carwash wastewater are produced per day from carwash places. Extensively it contains large quantities of chemicals from detergents, oil, grease, heavy metals, suspended solids, types of hydrocarbons, and biological contents. A novel electrocoagulation treatment by foil electrodes was conducted to remove COD, turbidity, Total Dissolved Solids (TDS) from contaminated carwash wastewater and decrease its Electrical Conductivity (EC). A thin layer of aluminum foil is used as an electrode in this treatment process. The effects of different voltage and treatment times were studied. The best result was found at a voltage of 30 volts and treatment time 90 minute where the removal efficiency of COD, turbidity, TDS, and EC were 97.94%, 99.90%, 25.31%, 15.57% respectively.    

scholarly journals A BIBLIOMETRIC ANALYSIS OF RESEARCH ON BIOCHAR FOR WASTEWATER TREATMENT

2021 ◽  
Vol 20 (1) ◽  
pp. 29-38
Author(s):  
Laili Fitria
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Bibliometric Analysis ◽  
Hazardous Materials ◽  
Future Research ◽  
University Of Florida ◽  
The Common ◽  
Scopus Database ◽  
Highly Cited Articles ◽  
Highly Cited

ABSTRACT  This paper investigates global research of highly cited articles on biochar for wastewater treatment using bibliometricanalysis from Scopus database. Based on bibliometric, highly cited articles were published between 2009-2018. We found33 highly cited articles with 6,429 citations from various journals, countries, institutions, and authors. The most activejournal to publish biochar in wastewater treatment is Journal of Hazardous Materials (JHM) from Netherlands. Mostactive authors come from America and China. University of Florida, USA, is the most active institution to research theuse of biochar in wastewater treatment. Then, the common keywords that authors used are biochar and heavy metals. Itshows that biochar is effective to remove heavy metals from wastewater. Also, biochar optimization in production andadsorption is a concern of future research. This is one of the first attempts to understand a stream of research which, overtime, has paved the way for the utilization of biochar as a material for wastewater treatment.

scholarly journals Wastewater treatment modelling: dealing with uncertainties

2009 ◽  
Vol 60 (8) ◽  
pp. 1929-1941 ◽  
Author(s):  
E. Belia ◽  
Y. Amerlinck ◽  
L. Benedetti ◽  
B. Johnson ◽  
G. Sin ◽  
...  
Keyword(s):  
Decision Making ◽  
Wastewater Treatment ◽  
Model Prediction ◽  
Prediction Accuracy ◽  
Future Research ◽  
Research Needs ◽  
Problem Statement ◽  
Engineering Project ◽  
Sources Of Uncertainty ◽  
Comprehensive Discussion

This paper serves as a problem statement of the issues surrounding uncertainty in wastewater treatment modelling. The paper proposes a structure for identifying the sources of uncertainty introduced during each step of an engineering project concerned with model-based design or optimisation of a wastewater treatment system. It briefly references the methods currently used to evaluate prediction accuracy and uncertainty and discusses the relevance of uncertainty evaluations in model applications. The paper aims to raise awareness and initiate a comprehensive discussion among professionals on model prediction accuracy and uncertainty issues. It also aims to identify future research needs. Ultimately the goal of such a discussion would be to generate transparent and objective methods of explicitly evaluating the reliability of model results, before they are implemented in an engineering decision-making context.

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