Principle and Process of Heavy Metal Removal from Sewage Sludge

2000 ◽  
Vol 34 (8) ◽  
pp. 1572-1575 ◽  
Author(s):  
Shiro Yoshizaki ◽  
Tahei Tomida
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Heavy Metal Removal

Heavy metal removal from sewage sludge under citric acid and electroosmotic leaching processes

2020 ◽  
Vol 242 ◽  
pp. 116822 ◽  
Author(s):  
Degang Ma ◽  
Meizhong Su ◽  
Jingjing Qian ◽  
Qian Wang ◽  
Fanyi Meng ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Citric Acid ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Heavy Metal Removal

Sulfate disinfection, stabilisation and heavy metal removal from sewage sludge – process description and preliminary results

2002 ◽  
Vol 45 (10) ◽  
pp. 287-292 ◽  
Author(s):  
D. Lowrie ◽  
J. Hobson ◽  
D.C. Stuckey
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Electron Flow ◽  
Heavy Metal Removal ◽  
Oxygen Demand ◽  
Hybrid Reactor ◽  
Pathogen Removal ◽  
Primary Sludge ◽  
Preliminary Results

A new, closed loop process for the disinfection, stabilisation and removal of heavy metal from sewage sludge (consisting of a sludge/sulfuric acid reactor, hybrid H2S generator and H2S bioscrubber) is described. Preliminary results for total solids (TS), volatile suspended solids (VSS), chemical oxygen demand (COD), acetate and propionate destruction in the hybrid H2S generator have shown that digestion efficiency is not compromised in a hybrid reactor generating H2S compared to a methanogenic reactor. 70% of the electron flow in the hybrid H2S generator was diverted to methane at a COD:SO4 ratio of 5.45:1. Enough H2SO4 could be generated from the H2S emitted at this ratio to effect sufficient metal solubilisation and pathogen removal from primary sludge.

Sewage sludge ash to phosphorus fertiliser: Variables influencing heavy metal removal during thermochemical treatment

2008 ◽  
Vol 28 (12) ◽  
pp. 2709-2722 ◽  
Author(s):  
H. Mattenberger ◽  
G. Fraissler ◽  
T. Brunner ◽  
P. Herk ◽  
L. Hermann ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Thermochemical Treatment ◽  
Sewage Sludge Ash ◽  
Phosphorus Fertiliser ◽  
Sludge Ash

scholarly journals Using bioleaching to remove metals from sewage sludge intended for land application

2021 ◽  
Author(s):  
Jun Nie
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Removal Efficiency ◽  
Agricultural Land ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Treatment Plant ◽  
Land Application ◽  
Sulphur Compounds ◽  
Recommended Level

Removal of heavy metal contaminants from sewage sludge is a necessity before it is used as an agricultural fertilizer (biosolid), due to environmental concerns and municipal, provincial and federal regulations. The bioleaching method is recommended as an economical and effective process for the removal of heavy metals from the Ashbridges Bay Treatment Plant (ABTP) sludge, some of them with concentrations exceeding the recommended level by the Ontario Ministry of Agriculture, Food, and Rural Affairs guidelines. The Gram-negative thiobacilli is a group of organisms with physiological and morphological similarity and grows by oxidizing ferrous ion and reduced sulphur compounds. One species of thiobacillus, T. ferrooxidan , was recommended as an effective bacterium for the heavy metal removal from sewage sludge. This research involved the incubation of adapted sludge using fresh raw digested sludge and activated sludge of ABTP. Using adapted sludge for the bioleaching process, the method was tested in a continuously stirred tank reactor (CSTR) in combination with a series of jar tests. Results showed that the metal removal efficiency increases with decreasing pH, and the solids content does not affect the removal efficiency of cupper and zinc very much during short term jar test. The results from the long-term (20-day) CSTR test demonstrated that the high T ferrooxians-contained adapted sludge could remove copper from the sewage sludge of ABTP very effectively, by as much as 79.2%. In comparison, the simultaneous removal efficiency of zinc and cadmium were also studied for the same process and, they are 82.0% and 83.9% respectively. The TSS degradation constant rate during the 20 days' bioleaching was found to be 0.0522 day -1. It is concluded that Ontario should continue to apply sludge to agricultural land, as sludge is an economic alternative, promotes recycling of resources, and is a valuable fertilizer. However, the toxic metals in sludge should be removed from sewage sludge using the bioleaching process to recommended level before it is disposed as a fertilizer for land application.

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