i just want to know that kitchen waste is how much efficient in heavy metals remediation when we add kitchen waste with heavy metals contaminated soil.
First of all, you need to understand the basic principle behind 'Bioremediation' - one is microbial bioremediation (microorganisms break down contaminants by using them as food) and the other phytoremediation using plants to bind and clean up pollutants (pesticides, petroleum hydrocarbons, metals and chlorinated solvents). Basically, the method involves transforming contaminants into substances that can be absorbed by autotrophic organisms WITHOUT any toxic effect on them. Vegetable waste in this regard does not qualify in any of the two categories mentioned above and in fact, microorganisms convert the biodegradable waste into 'Compost'. Hope this meets your understanding.
Organic substances can well complex heavy metals. Since kitchen waste is/becomes substance, of amino acids, carboxil acids...etc which are blocking components of heavy metals they can/might be effective in remediation of soil, too.
Kitchen waste itself qualifies for hazardous waste, at least here, in Europe. It would be ecologically more sound to first decompose it with some additional carbon source. Then you can incorporate the ready compost in the soil.
1. It will improve the activity in the rhizosphere. This might induce a better uptake of metals by a suitably chosen plant culture.
In simpler words: you could perform "phytoremediation".
2. Compost increases the humus concentration in the soil. Humus forms stable molecular complexes with metal ions. That would be "immobilisation".
3. Soil-born microbes would contribute to both of the two above effects.
Kitchen waste will decompose. Incorporate the ready compost in the soil.
It will improve the activity in the rhizosphere. This causes better uptake of metals by a suitably chosen plant culture.
Compost increases the humus concentration in the soil. Humus forms stable molecular complexes with metal ions.
You may also be interested in a third kind of bioremediation process, that is perhaps catalyzed by additional soil organic matter. It is: converting the chemical species of the pollutant to a less toxic form.
For instance, stimulating microorganisms to reduce Cr(VI) to Cr(III). Cr(VI) is a lethal poison to humans, while Cr(III) is an essential trace element.
the fast decomposition of any wet organic waste in the soil will result in production of high organic acid that decreases soil pH and increase the solubility of catatonic heavy metal, which in turn will worsen the situation , the best way of heavy metal removal from the soil is by phytoremediation, by planting a hyper accumulator plant utilizing phytoextraction techniques like Indian mustard.
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