Difference between revisions of "Team:Aix-Marseille/Integrated Practices/Process"

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Sewage sludge are obtained daily in high amounts, all over the world, as effluents treatment is obviously a continued process. Indeed this source is '''abondant''' and '''inexhaustible''', as in almost every city around the world, effluents are treated and sewage sludges are collected. In most of the cases, when metals concentrations in sludges are too high to perform a valorization in the environnement as spreading on fields, the procedure is to stock sludges in a confined place. To reduce the stock volume, sludges are burnt.This step is precisely where our process could be connected to the effluents treatment process network. in some case, the incineration may not be realized yet, so our process should include a incineration step.
 
Sewage sludge are obtained daily in high amounts, all over the world, as effluents treatment is obviously a continued process. Indeed this source is '''abondant''' and '''inexhaustible''', as in almost every city around the world, effluents are treated and sewage sludges are collected. In most of the cases, when metals concentrations in sludges are too high to perform a valorization in the environnement as spreading on fields, the procedure is to stock sludges in a confined place. To reduce the stock volume, sludges are burnt.This step is precisely where our process could be connected to the effluents treatment process network. in some case, the incineration may not be realized yet, so our process should include a incineration step.
  
[[File:T--Aix-Marseille--maquette2.jpeg|750px|left|thumb| Model of facilities of our process. All important elements in the life cycle of platinum, except for the step of production (mines) are displayed here:  road, effluents treatment plants, field for spreading of sludge and of course, the facilities where our process would occur]]
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[[File:T--Aix-Marseille--maquette2.jpeg|800px|center|thumb| Model of facilities of our process. All important elements in the life cycle of platinum, except for the step of production (mines) are displayed here:  road, effluents treatment plants, field for spreading of sludge and of course, the facilities where our process would occur]]
  
 
''If we want to harvest '''1g''' of initial platinum, '''1161kg''' to '''3676 kg''' of sewage sludge ashes should be necessary( see [[Team:Aix-Marseille/Integrated_Practices/Process#Required_mass_of_sludge_ashes| Raw Calculations]]).  
 
''If we want to harvest '''1g''' of initial platinum, '''1161kg''' to '''3676 kg''' of sewage sludge ashes should be necessary( see [[Team:Aix-Marseille/Integrated_Practices/Process#Required_mass_of_sludge_ashes| Raw Calculations]]).  
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Given that the average  platinum concentration<ref>Jackson, Prichard and Sampson., 2009 https://www.ncbi.nlm.nih.gov/pubmed/19878972</ref> in sludges ashes can range from '''272µg/kg''' to '''602 µg/kg'''  
 
Given that the average  platinum concentration<ref>Jackson, Prichard and Sampson., 2009 https://www.ncbi.nlm.nih.gov/pubmed/19878972</ref> in sludges ashes can range from '''272µg/kg''' to '''602 µg/kg'''  
 
So in order to recover 1g of platinum we need a volume estimated to: V=1000/C°*10^-6
 
So in order to recover 1g of platinum we need a volume estimated to: V=1000/C°*10^-6
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Volume ashes=1000/272*10^-6=3676470g i.e. '''3676kg'''
 
Volume ashes=1000/272*10^-6=3676470g i.e. '''3676kg'''
  
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''-the total of DFHOB to import is 4.68 moles so ((4.68/2.65*10^(-5))/1000)= '''176.6 kg''' of dry cells''
 
''-the total of DFHOB to import is 4.68 moles so ((4.68/2.65*10^(-5))/1000)= '''176.6 kg''' of dry cells''
  
''- as the dry weight is a tenth of the wet one and thtat a pellet is composed half by water, the mass of the cell pellet to add will be (176.6*10*2)= '''3532 kg''' ''
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''- as the dry weight is a tenth of the wet one and that a pellet is composed half by water, the mass of the cell pellet to add will be (176.6*10*2)= '''3532 kg''' ''
  
 
===Concentration in the pellet===
 
===Concentration in the pellet===
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===Concentration in the pellet ashes===
 
===Concentration in the pellet ashes===
  
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[[File:T--Aix-Marseille--uptake2.png|500px|left|Ashes concentrations depends on the incubation]]
 
Basically,  after a combustion a wet cells volume is divided by a factor > 20.
 
Basically,  after a combustion a wet cells volume is divided by a factor > 20.
 
 
 
 
''In the situation with 1 g initial platinum,  with an incubation of 10 hours, the concentration will be (2.20*10^(-4)*20)=''' 4.41 mg/kg'''.
 
''In the situation with 1 g initial platinum,  with an incubation of 10 hours, the concentration will be (2.20*10^(-4)*20)=''' 4.41 mg/kg'''.
 
Actually the concentration in the ashes depends primarily on the step of incubation of the [[Team:Aix-Marseille/Integrated_Practices/Process#Siderophore_recoverer_addition|step 6]], as display on the chart. [[File:T--Aix-Marseille--uptake2.png|500px|left|Ashes concentrations depends on the incubation]] This chart has been realized with predicted values, following a linear increase of the uptake over time. (Values displayed here have not been used for calculation in the others examples.''
 
 
 
 
 
 
  
  
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Actually the concentration in the ashes depends primarily on the step of incubation of the [[Team:Aix-Marseille/Integrated_Practices/Process#Siderophore_recoverer_addition|step 6]], as display on the chart.  This chart has been realized with predicted values, following a linear increase of the uptake over time. (Values displayed here have not been used for calculation in the others examples.''
  
  

Latest revision as of 01:02, 20 October 2016