Engineering and Technology Journal

A study was carried out to investigate the effects of recharging primary treated domestic wastewater on soil characteristics by special recharge-recovery method developed and practiced in the laboratory working model. Recently, the amounts of wastewater are sharply increasing and the kinds of pollutants are also varied as the world wide industry is being developed incessantly. The subbase soil is brought from Jerashi quarry, northeast of Ramadi and placed in model which is made from plexus glass with dimensions (1.1 m * 1.1 m * 0.6 m). Wastewater characteristics, main soil and soil samples after recharging of wastewater 330L, 420L, 510L, and 600L, for one time every seven days and comparing the means for soil chemical characteristics before and after experiment. Soil reaction (pH), electrical conductivity (EC), organic matter (OM), chloride ions (CL), sulphate content (SO3), gypsum content (GC), total dissolved salt, (TSS), and total dissolved solids (TDS). The soil-aquifer system (SAT) can be used efficiently as a wastewater treatment plant. After recharging wastewater, there were slightly increase of pH and OM in comparison with EC, CL, SO3, GC, TSS, and TDS which might cause problems in the long term if the land was used for construction purposes.

Wastewater from electronic printed circuit board (PCB) factories was subjected
to lab-scale ion exchangers of two types: strong acid cation followed by weak base
anion exchanger. The experimental investigation was directed to study the ion
exchanger performance in terms of three different parameters namely (TDS, feed
rate and bed depth). Box-Wilson composite rotatable design was adopted in
designing the experiments. Breakthrough times of (PCB) wastewater were studied
through TDS ranged between 317 to 1193 ppm, feed rate ranged between 0.712 to
4.980 l/h, and bed depth of cation exchanger ranged between 9.4 to 60.6 cm and
anion exchanger ranged between 14.3 to 91.0 cm.
Simulation the effect of the studied variables through their pre-designed ranges
in terms of breakthrough time by 2nd order polynomial equation was obtained. In
general, the performance and characteristics of adopting two bed deionizers (cation
and anion beds) was proved efficient for the removal of the ionic contaminants and
not less than 95 % of wastewater is recycled. In addition, the research considers the
treatment of highly metals content regenerant solution out coming from
reclamation system to minimize its metal content. The reclamation of wastewater
was studied in terms of breakthrough time (i.e., the leakage of the cations).