-

Reuse of wastewater is one of the most effective methods for decreasing environmental contamination and alleviating water deficiency in arid and
semi-arid regions. However, depending on physical, chemical, and biological properties of treated wastewater as a source of irrigation water, soil properties
could change. The main objectives of this study were to evaluate the chemical effects of irrigation with secondary effluent of North Isfahan S_wage Refinery
non-irrigated lands close to the fields as a control. The chemical analyses of soil samples indicated that soil salinity and sodicity had decreased significantly

Effects of Irrigation with Secondary Emuent of North Isfahan Sewage Refinery on Some Chemical Properties. of
Borkhar Region Soils.
A. A. SAFARI 1 AND SHe HAG-RASULIHA 2
1, 2 . Ph.D Student and Professor, Faculty of Agriculture Isfahan University of Technology.
Accepted Oct. 4, 2000
SUMMARY
by irrigation with the effluent for seven years.. Organic carbon and nitrogen, available phosphorus, total nitrogen, t<;>tal phosphorus and cation exchange
capacity of top layer (0-40 cm) of the ilrigated _pils with the effluent have increased considerably. However, pH, NH4-N, NO3+ NO2-N, available K, total K and heavy metals of soils irrigated with the effluent did not change.
Except iron, the levels of heavy metals (specially the levels of Pb and Ni) in the Borkhar region soils were very high Indeed, the level of Ni has got close
to critical.