UTILIZATION OF RICE HUSK IN THE SORPTION OF EUTROPHICATION NITROGEN AND PRODUCING A USEFUL ORGANIC FERTILIZER FOR PLANT PRODUCTION

الملخص

In the present research, the optimum exploitation procedure of the agricultural waste was conducted reaching to zero residue level (ZRL). This aim was fulfilled via two steps. The first one was the removing of nitrogen from simulated synthetic aqueous solutions (SSAS) by using an agricultural waste (which is Iraqi rice husk, IRH)) as a bio sorbent material in a fixed bed continuous mode and under many multi operating conditions; which were concentration, pH, flow rate, contact time, temperature and height of adsorbent material in the fixed bed. The second step was the utilization of the adsorption residue, which is affluent with adsorbed loaded nitrogen, by mixing it with agriculture soil as a low cost compost for tomato harvest. The results show that the removal efficiency of nitrogen was decreased with increasing N concentration, pH and flowrate but increased with increasing the contact time, temperature and height of adsorbent material in the fixed bed. The maximum percentage adsorption efficiency was 96.74%. The adsorption residue exhibited a good behavior when used as manure and the weight of tomatoes was increased by 18.25%, compared with the same harvest produced without using this fertilizer. Thus it can be profiting from the agricultural waste by a simple, economic and eco-friendly method accessing to ZRL.