In what type of soil have you done the experiment? clays, sands, silts...? Does this experience work with any type of waste water or should water have one or more specific pollutants or waste?

Salinity of the soil may be effected with various parameters mainly characteristics of the waste water and type of soil.

Yes in some cases if the EC of waste water is less than EC of soil ,in this case irrigation with waste water causes decrease in soil EC, or the waste water contains compounds which adsorb cation s or anions in this case the salinity of soil may decease.

If you analyze the composition of the waste water and the properties of the soil with which you are experimenting, we should have more information about why you have observed decreased salinity.

That is natural if the soil is saline. In usually with wastewater soil will wash, therefore the amount of salt will be decreased

.....and of course as well as differences in salinity between water and soil, the volume applied is important (ie the leaching fraction). If this is not sufficient it may cause salinity to accumulate in the profile.

All answers by other authors need to be analysed and duly applied. Conditions to keep note of : 1.Types of soil,2. Types of dissolved solids in ww, 3. Types of suspended solids, 4. HRT to be assessed in the layers of soil..For all the above.. Lab. scale models can be practically done, and assessed 

Thank you, colleagues. I just wanted to know the relation between the inputs of organic matter whatever their origin and the decrease of the salinity of the soil whatever their type. Thank you.

The phenomenon of washing the soil by adding waste water is due to the fact that the water drags the salts towards the deeper layers and also because the organic matter from that water occupy the voids or pores in which the salts were before. Therefore, the more waste water enters the soil, the lower the salinity of the soil.

Professor Dr Akram Othman Esmail has said correctly.

During initial phase of saline-sodic, sodic and saline soils high electrolyte waters are better. We conducted several field studies with arid region calcareous soils (ECe 8-25 dS/m, pHs 8--10, SAR 30-150, sandy loam to clay loam texture, mostly having 7-12 cm thick plow pan) by growing rice and wheat crops in rotation receiving tile drain water (EC 308 dS/m, SAR 11-28, RSC 3-9 mmolc/L) with gypsum, FYM, GM, bore hole technology, seed priming in gypsum solution (6-24 h), each alone or in combination. Generally tile drain water proved better for reclamation and crop yields during the first 2-3 years. Rice proved better crop during reclamation.

Dear Sir,

Generally when we treat wastewater containing the organic matter (suspension or dissolved), it will be aerobic or anaerobic. In your situation, the wastewater leached through the soil. In the soil, the anaerobic condition might be developed that water generally occurs in the engineering landfill and water leached out at the bottom of the landfill. In the anaerobic condition, particularly in the acetogenesis phase, the formation of acetic acid (volatile fatty acid) occurs. The formation of acid might be the reason for the decrease in the salinity of soil through which the leaching was done.