تقييم مستوى جودة مياه الصرف الصحي المعالجة و المستخدمة في الري : محافظة إب إنموذجا

الملخص EN

This study evaluates the quality level of some randomly-selected samples of the treated wastewaters generated from the Ibb Treatment Plant to be reused for irrigation.

In particular, the selected samples were analyzed in terms of 15 indicators The results were then compared with those obtained by similar studies conducted in other governorates in Yemen (i.e., Hawtah, Aden, Dhamar, and Sana'a).

They were also compared with the quality standards of treated wastewaters set by the Yemeni Environment Protection Authority and the World Health Organization (WHO).

The results were as follows: 1) the sodium concentrations in the treated wastewaters from the five treatment plants are (11.74, 14.43, 18.25, 7.1 and 9.2) respectively; 2) chloride concentrations are (14.8, 26.7, 12.7, 3.0 and 7.1); HCO3 rates are (13.80, 10.16, nd, 10.8, and 10.19); faecat coliform (1100, 5.3X106, 3X105, nd, nd, ); and Cu concentrations in the treated wastewaters from Al-Hawtah and Sana'a are (0.55 and 0.3) respectively.

Generally speaking, the results show that the percentages of the above-mentioned indicators and elements exceeded the limits permitted, which in turn indicates that the quality level of the treated wastewaters in Ibb and the other governorates is low.

Therefore, it Could be said that treated wastewaters are not fit to be reused in the irrigation.

The study concluded by providing the following recommendations:  A well-developed strategy should be devised to manage treated wastewaters more effectively.

 It is of great importance to improve wastewater treatment methods and to expand horizontally in increasing the number of oxidization pools and building sterilization pools in the Yemeni treatment plants in order to avoid failure to reduce the pollutants, in particular the germinal ones, as well as any other elements that may affect the reuse of the Treated water in irrigation .

Investment projects in the field of treated wastewaters-based irrigation should be encouraged and supported, according to developed scientific criteria, especially in dry and semi-dry areas..

The government should adopt typical irrigation projects for reuse of treated wastewaters based on strict health criteria and developed scientific techniques as a first step towards becoming generalized.

It is necessary to investigate the possibility of using modern techniques of wastewaters treatment Projects such as Nano-technology.