استخدام مياه الصرف الصحي المعالجة لري المسطحات الخضراء في مدينة جدة غرب المملكة العربية السعودية : دراسة في الجغرافية البيئية

Abstract EN

Kingdom of Saudi Arabia Government has concerned in reusing the wastewater to benefit from it in irrigating the landscaping, as the state's new orientations and the strategic planning of the Ministry of Environment, Water & Agriculture have sought to reduce the pressure on the un-renewable water sources and to benefit from the water renewable sources, provided that maintaining the environment, hence, this study will focus on identifying the natural, chemical and biological features of the treated water that used in irrigating the landscaping.

chemical oxygen and phosphate are exceeded the standards in all the gardens by the average of (202.45), (6.50) mg/liter in a row, and for the bio-chemical oxygen has exceeded the standards in most of the gardens by a digital average of (12.27 mg/liter).

For iron, potential of hydrogen (PH), zinc, magnesium, calcium, sodium, chloride and fluoride have not exceeded the standards in all gardens by the following averages (0.036), (7.29) (19.15), (57.94), (303.89), (343.97), (0.268) mg/liter in a row.

But the results of copper, nitrate, sulphate, and manganese were within the allowed domains in most of the gardens, the study field was completely free from lithium, chrome, and cobalt, but the ammonium ions were found in two gardens.

The recommendations are to make sure from the quality of external water from the stations before using it in irrigation, and the necessity of applying the environmental standards and requirements that set by the ministry during taking a sample from the station water periodically.

This study aims to evaluate the quality of water that used in irrigating the green area for some selected locations in Jeddah City and compare it with the standards that the Ministry of Environment, Water and Agriculture in 2006 and FAO have adopted, and to identify the relationship pattern between the geographical location of landscaping and the features of treated water that used in irrigation, and showing the adequacy of this water to the technical standards and requirements.

There are twelve landscaping areas selected according to determined standards set by the researcher, and the samples have taken from the tanks of landscaping water to analyze it.

The study indicated the lake of adequacy for this water to irrigate the gardens in many locations, besides, the variation of the natural, chemical and biological features from one garden to another, and that due to the difference of water source that used in irrigation, and the study also indicates that there is no impact to the spatial variation of the gardens as the results reveal that it is statistically significant.

The study indicate the variation of natural features, as the turbidity and electrical conductive have exceeded the standards in most of the gardens by a digital average of (2009.09), (21.27) mg/liter in a row, but the melted solid material was within the allowed borders in most of the gardens.

For the biological features, the Escherichia coli has appeared in all gardens, while the vermin and fungi are found in most of the gardens that studied.

The Cyanobacteria is found in the Mayril Garden only.

The results of chemical features indicated that the chemical