scholarly journals Optimization of kinetics and operating parameters for the bioleaching of heavy metals from sewage sludge, using co-inoculation of two Acidithiobacillus species

2018 ◽  
Vol 2017 (2) ◽  
pp. 390-403 ◽  
Author(s):  
Haifei Li ◽  
Maoyou Ye ◽  
Li Zheng ◽  
Yanbin Xu ◽  
Shuiyu Sun ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Mixed Culture ◽  
Pure Culture ◽  
Ferrous Iron ◽  
Iron Concentration ◽  
Operating Conditions ◽  
Operating Parameters ◽  
Acidithiobacillus Thiooxidans ◽  
Initial Ph

Abstract This study explores the potential for synchronous extraction of Cu, Cr, Ni and Zn during sewage sludge bioleaching processes, using three types of bacterial cultures: a pure culture of Acidithiobacillus ferrooxidans (A. ferrooxidans); a pure culture of Acidithiobacillus thiooxidans (A. thiooxidans); and a mixed culture of A. ferrooxidans and A. thiooxidans. Variable operating parameters included initial pH, solids concentration, sulfur concentration and ferrous iron concentration, with optimization via Box-Behnken design of response surface methodology. Results indicate that the mixed culture of A. ferrooxidans and A. thiooxidans, was the most effective at bioleaching heavy metals from sewage sludge. The optimal operating conditions were as follows: an initial pH of 2.0, with concentrations of 3% solids, 6.14 g L−1 sulfur and 4.55 g L−1 ferrous iron. Maximum extraction efficiencies obtained after 14 days of bioleaching under optimal conditions, were 98.54% Cu, 57.99% Cr, 60.06% Ni and 95.60% Zn. Bioleaching kinetics were effectively simulated using a shrinking core model to explain the leaching reaction, with modelling results suggesting that the rate was determined by the diffusion step.

The treatment of zinc-cyanide electroplating rinse water using an electrocoagulation process

2013 ◽  
Vol 68 (10) ◽  
pp. 2220-2227 ◽  
Author(s):  
Elif Senturk
Keyword(s):  
Electrode Material ◽  
Operating Time ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Operating Parameters ◽  
Initial Ph ◽  
Electrocoagulation Process ◽  
Removal Efficiencies ◽  
Rinse Water ◽  
Electrode Connection

This paper investigates the treatment of zinc-cyanide electroplating rinse water using an electrocoagulation process (ECP). The effects of operating parameters such as electrode material, current density (2.5–40 A/m2), operating time (0–60 min), initial pH (5–12) and electrode connection mode (monopolar parallel (MP-P), monopolar series and bipolar series) on the ECP were evaluated to find the optimum operating conditions. At 20 A/m2, 60 min, the highest removal efficiencies were obtained with 85 and 99% for Fe and 64 and 33% for Al electrodes, for cyanide and zinc, respectively. The optimum operating conditions were found to be 30 A/m2 and 40 min, for the Fe electrode at the original pH (9.5) of the rinse water. Considering efficiency and economy, the MP-P connection mode was determined as the optimum connection mode.

scholarly journals Use of Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans in the Recovery of Heavy Metals from Landfill Leachates

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3336
Author(s):  
Tomasz Kamizela ◽  
Anna Grobelak ◽  
Malgorzata Worwag
Keyword(s):  
Heavy Metals ◽  
Mixed Culture ◽  
Reverse Osmosis ◽  
Landfill Leachate ◽  
Acidithiobacillus Ferrooxidans ◽  
High Efficiency ◽  
Metal Removal ◽  
Acidithiobacillus Thiooxidans ◽  
Landfill Leachates ◽  
Removal Of Heavy Metals

Among the methods used to remove metals and their compounds from landfill leachates with low application costs and high efficiency are bioleaching and biosorption. The most effective bacteria used in the metal removal process are Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. The aim of the study was to determine the usefulness of the A. ferrooxidans and A. thiooxidans population in removing heavy metals from landfill leachate. In addition, development opportunities for bacterial population using landfill leachate as growth medium were identified. The substrate for the research was the raw leachate before the reverse osmosis process. In order to increase the efficiency of trace elements removal and recovery from leachate, variable combinations have been used which differ by the addition of sulfuric acid, A. ferrooxidans culture, A. thiooxidans culture, mixed culture containing populations of both bacteria, and elemental sulfur. Based on the research, it was found that the removal of heavy metals from leachate was a selective process. High bioleaching efficiency, from 80% to 90%, was obtained for all metals for which the sample acidification or sulfur addition was used. The simultaneous combination of both these additives turned out to be the most advantageous. The A. thiooxidans culture was the most effective in bioleaching reverse osmosis effluents. For the A. ferrooxidans culture used, much lower efficiencies were obtained, while by contrast, the use of mixed culture of two bacterium species had no significant effect.

scholarly journals EXTRACTION OF HEAVY METALS IN A SEWAGE SLUDGE-TREATED LATOSOL

2005 ◽  
Vol 13 (13) ◽  
pp. 13-25
Author(s):  
Ana Tereza Jordao Pigozzo ◽  
Jorge De Lucas Jr ◽  
Ervim Lenzi ◽  
Carlos Alberto Scapim ◽  
Antonio Carlos Saraiva da Costa
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Exchange Capacity ◽  
Soil Samples ◽  
First Year ◽  
Fertility Level ◽  
Ph Variation ◽  
Initial Ph ◽  
Second Year ◽  
Different Doses

The presence of heavy metals is one of the main hazards against the use of sewage sludge in agronomy. In a field experiment applications of sewage sludge in medium-textured Dark Red Latisol (DRL) were evaluated by the extraction of essential or non-essential metals with a DTPA extractor. The experimental design consisted of randomized blocks subdivided into sections of 6 treatments of sewage sludge (0, 6, 20, 40, 60 and 80 t ha-1) during the first year and (0, 6, 20, 40, 60 and 80 t ha-1) during the second year. The experiment had 4 replications and 5 soil collection periods (0, 30, 60, 90, and 120 days of sludge incorporation). Sewage sludge was applied at a mean depth of 0-20 cm. Soil sampling was undertaken during the periods of sludge incorporation so that the elements available in the soil in different doses could be evaluated Soil samples were analyzed as to fertility level. Concentrations of the metals Cu, Zn, Cd, Ni, Co, Pb, and Cr were determined by atomic absorption in DTPA extractor solution. Concentrations of Cd, Ni, Co, Pb, and Cr were not detected since values were lower than the detection limit of each. Application of sewage sludge increased Cation Exchange Capacity (CEC) and there was an initial pH variation, albeit the latter returned concentration to its original level. Owing to the repetition of applied sludge, Cu and Zn rates in soil samples gradually increased during the two agricultural years caused by an increase in the doses of applied sewage sludge.

Leaching Characteristics of Heavy Metals from Sewage Sludge by Acidithiobacillus thiooxidans MET

2003 ◽  
Vol 32 (3) ◽  
pp. 751-759 ◽  
Author(s):  
H. W. Ryu ◽  
H. S. Moon ◽  
E. Y. Lee ◽  
K. S. Cho ◽  
H. Choi
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Acidithiobacillus Thiooxidans ◽  
Leaching Characteristics

Bioleaching of heavy metals from sewage sludge using Acidithiobacillus thiooxidans

2010 ◽  
Author(s):  
Ye-Ming Wen ◽  
Hong-Yan Lin ◽  
Qing-Ping Wang ◽  
Zu-Liang Chen ◽  
Fangming Jin ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Acidithiobacillus Thiooxidans

Bioleaching of heavy metals from sewage sludge by Acidithiobacillus thiooxidans—a comparative study

2012 ◽  
Vol 12 (6) ◽  
pp. 900-908 ◽  
Author(s):  
Ye-Ming Wen ◽  
Qing-Ping Wang ◽  
Caixian Tang ◽  
Zu-Liang Chen
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Comparative Study ◽  
Acidithiobacillus Thiooxidans

Cooperation between two Thiobacillus strains for heavy-metal removal from municipal sludge

1992 ◽  
Vol 38 (3) ◽  
pp. 181-187 ◽  
Author(s):  
J.-F. Blais ◽  
J. C. Auclair ◽  
R. D. Tyagi
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Sewage Sludge ◽  
Mixed Culture ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Municipal Sludge ◽  
Bacterial Strains

A mixed culture of two fast-growing bacterial strains for heavy-metal solubilization of municipal sewage sludge has been developed. Strain VA-7 decreases the initial sludge pH (7–8.5) to a value between 4.0 and 4.5. Then, strain VA-4 begins growing and further reduces the pH to values below 2.0. The rapid decrease of sludge pH by a mixed culture through sulfur oxidation into sulfuric acid solubilizes the toxic metals (Cd 83–96%, Cr 16–54%, Cu 85–87%, Mn 91–94%, Ni 78–79%, Pb 28–46%, Zn 82–96%) to levels recommended for intensive use of residual sludge in agriculture. A study of the physiological and metabolic characteristics of these strains revealed that isolate VA-7 is a strain of Thiobacillus thioparus (ATCC 55127), while isolate VA-4 corresponds to a Thiobacillus thiooxidans (ATCC 55128). These bacterial strains possess distinctive physiological characteristics that allow them to easily grow and solubilize heavy metals in municipal sludge. Key words: heavy metals, sewage sludge, thiobacilli, bioleaching, elemental sulfur.

scholarly journals Evaluation of bioleaching process for the simultaneous reduction of metals and total coliform from sewage sludge

2021 ◽  
Author(s):  
Safika Akter
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Activated Sludge ◽  
Metal Removal ◽  
Ferrous Sulphate ◽  
Treatment Plant ◽  
Total Coliform ◽  
High Concentration ◽  
Simultaneous Reduction ◽  
Initial Ph

Bioleaching has been proven to be a promising technology for removing heavy metals from the sewage sludge over many years. The main objective of this research is to evaluate the bioleaching process for the simultaneous reduction of three heavy metals - copper(Cu), cadmium(Cd), zinc(Zn) and total coliform from the sewage sludge of the Ashbridges Bay Treatment Plant (ABTP). Bioleaching was carried out with adapted activated sludge containing high concentration of iron oxidizing bacteria T. ferrooxidans using ferrous sulphate as a substrate without adjusting the sludge initial pH to about 4 with acid. The results demonstreated that simultaneous metal removal efficiencies of Cu, Zn were 70% and 74% for Cd respectively after 10 days of bioleaching. The final pH and ORP were found 2.44 and 533 respectively. After this research, it was also observed that the process of bioleaching by T. ferrooxidans is very efficient for the reduction of total coliform from the sludge. This proces allows a considerable reduction in total coliform (3-4 log removal) for the activated sludge examined over a 10 day period.

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