إزالة المخلفات الصلبة فى نظام إعادة تدویر المیاه فى الزراعة المائیة

نوع المستند : Original Article

المؤلفون

1 مدرس الهندسة الزراعیة المساعد - قسم الهندسة الزراعیة - کلیة الزراعة بمشتهر – جامعة بنها - مصر.

2 استاذ الهندسة الزراعیة المساعد - قسم الهندسة الزراعیة - کلیة الزراعة بمشتهر – جامعة بنها - مصر.

3 استاذ الهندسة الزراعیة - قسم الهندسة الزراعیة - کلیة الزراعة بمشتهر – جامعة بنها - مصر.

المستخلص

تعتبر المخلفات الناجمة عن إخراج الأسماک وباقی الغذاء الذى لم یؤکل من أهم المشکلات فى الاستزراع المائی المکثف داخل نظام اعادة تدویر المیاه نظرا لان تراکمها یؤدى إلى زیادة الحاجة إلى الأکسجین الذائب فى المیاه وارتفاع نسبة غاز الأمونیا السام للأسماک وسرعة انسداد المرشحات المیکانیکیة والحیویة وبالتالی فعملیات إزالة تلک المخلفات تعتبر من العوامل المهمة لتفادى المشکلات السابقة. ومن ثم کان الهدف من هذا البحث هو دراسة کفاءة کلا من مجمع المخلفات والمرشح الشبکى فى نظام اعادة تدویر المیاه وذلک لتحسین جودة المیاه وزیادة معدل نمو الاسماک. وقد تم تطویر نموذج ریاضى لإیجاد معدل إزالة المخلفات الصلبة من نظام إعادة تدویر المیاه, وکانت أهم النتائج کما یلى:
-          معدل إزالة المخلفات الصلبة المترسبة الفعلیة والنظریة یتراوح من 0.0304 إلى 0.0556 کجم م-3 و 0.0390 کجم م-3, على الترتیب. وکان متوسط کمیة المخلفات المترسبة المزالة یومیا بواسطة مجمع المخلفات الفعلیة والنظریة یتراوح من 0.33 إلى 6.26 کجم/یوم ومن 0.34 إلى 4.41 کجم/یوم, على الترتیب.
-          معدل إزالة المخلفات الصلبة العائمة الفعلیة والنظریة یتراوح من 0.0123 إلى 0.0806 کجم م-3 ومن 0.0124 إلى 0.1425 کجم م-3, على الترتیب. وکان متوسط کمیة المخلفات العائمة المزالة یومیا بواسطة المرشح الشبکى الفعلیة والنظریة یتراوح من 0.11 إلى 11.34 کجم/یوم ومن 0.11 إلى 15.70 کجم/یوم, على الترتیب.
-          وکانت کفاءة مجمع المخلفات تتراوح من 27.40 إلى 57.79%.
-          وکانت کفاءة المرشح الشبکى تتراوح من 15.46 إلى 57.71%.
-          وکانت نتائج النموذج الریاضی متفقه مع النتائج التجریبیة.

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