الفهرس 
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Abstract
This research aims to study three different methods used instream for drain water treatment. Application of agricultural waste (rice husk), plastic material, and rotating paddles, to improve the self-purification process through the stream and achieve the possibility of its water reuse.
A pilot was made at Faqous WWTP, Sharkia Governorate, near to Bahr al-
Baqar drain bank, simulated five parallel channels built from bricks plastered by epoxy mortar. The first channel represents the drain water without treatment as raw water. The second, third, fourth and fifth channels applied the treated media with different lengths. Samples were taken from different locations from each channel, the channel beginning, after the treated media by one meter, then 5 meters and at 10 meters from the channel beginning. Three methods were tested, the first used natural material by agricultural wastes of rice husk, the second used artificial media of overlapping perforated plastic boxes, and the third used rotating paddles rotated due to the water velocity in the stream. Experiments were conducted on 3 operating cycles one for each method, and in each cycle water samples were taken a week after the start of operation and for a period of six weeks to measure the different elements.
Laboratory experiments showed that the removal ratio using 140 cm with all the applied methods is the higher in removal efficiency than the other lengths, where it achieved removal ratios of 20-87% with rice husk and from 34 – 87% with plastic and from 47 – 85% with rotating paddles for all measured items, which are BOD, COD. TSS, HM and an increase ratio in DO were ranging from 20-80% for the three methods.
Technical, financial and environmental comparisons were made between the three methods showed that the use of rice husk is the best for treating agricultural drain water. So the simulation model was made for it. The mathematical simulating equations were deduced to determine the removal ratio of each element with rice husk media application using the data of the first four weeks, and its verification was confirmed by using the results of the fifth and sixth weeks.