The use of wastewater for irrigation has been associated with a number of advantages. However, Wastewater irrigation leads to accumulation of heavy metals in the soil.
Is there a solution to fight against the problem of accumulation of heavy metals in the soil due to the reuse of wastewater in agriculture?
Well,
In the philosophy of reuse of wastewater, it is not advisable to use wastewater directly, this process leads to soil degradation and an increase in the concentration of heavy elements in the soil.
If we take into account the process of natural weathering and erosion or the results originated from human activities, the final station for depositing pollutants of water and air will be occurred in the soils or seas. Therefore it is advised in the use process that it is preceded by the effectiveness of recycling and it is carried out by treating pollutants in the wastewater treatment plants and then it is reused for irrigation purposes.
Regards
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Dear F. Bouteldjaoui,
If you want to solve this problem in an economic and environment-friendly way, Then apply a constructed wetland system. Its a kind of phytoremediation techniques. depending on the water quality, the wetland system could also be optimized.
In such a situation you need to use treated waste water.Waste water treatment can be done by physical ,chemical and biological method. Phytoremediation can be used to remove heavy metals from waste water .Any aquatic weed having the capability to remove concerned heavy metal from waste water can be used like Azolla pinnata a water fern is used for removing Cd,Cu from waste water.
Adsorption of heavy metals and possibly other contaminants from waste water before use can help in reducing heavy metals contamination in the soil. Adsorbent such as tea waste, coffee waste, activated carbon were reported to be very effective in removing different types of contaminants in aqueous media.
More importantly, it's cost effective, environmentally friendly and simple.
On this situation you can remediate heavy metal from wastewater before discharge it via effective and environmentally friendly techniques: adsorption, coagulation so no
First, you might remove heavy metal from the wastewater using some of the solutions that have been suggested on the previous comments. Thus, you can ensure better reuse water quality for using in agricultural irrigation, and then, avoid the accumulation of heavy metals in the soil.
Just as Muhammad Aliyu rightly suggested, you should consider remediation of heavy metal from the wastewater before discharge or use, via cost cost-effective and environmentally friendly techniques such as Phytoremediation, adsorption, coagulation, etc.
Zeolites are good adsorbent to remove heavy metals. Zeolite embedded sheet (ZES) can be used to separate heavy metals easily from the wastewater.
Very true Muyiwa Michael Orosun and some of the plants used in remediation are food crops at the same time
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