خزَّان التحليل (التخمير) Septic Tank هو عبارة عن غُرفة معزولة -غير مُنفذة للمياه- ومصنوعة من الخرسانة أو الألياف الزجاجية أو البولي فينيل كلوريد PVC أو البلاستيك، وإليها تتدفق المياه السوداء والمياه الرمادية للمعالجة الابتدائية. تقوم عمليات الترسيب و التحلّل اللاهوائية بتخفيض المواد الصلبة والعضوية، ولكن تعتبر المعالجة متوسطة وغير مكتملة.
تتدفق السوائل إلى الخزَّان حيث تسقط الجسيمات الثقيلة إلى القاع، بينما الخبث الطافي -أو الزَّبَد- (ومعظمها من الزيوت والشحوم) فتطفو لأعلى، ومع مرور الوقت تتحلل المواد الصلبة المستقرة في القاع تحللًا لاهوائيا. ومع ذلك، فإن معدل تراكم المواد الصلبة في القاع أسرع من معدل التحلّل، ويجب إزالة الحمأة المتراكمة والخبث دوريًا. يجب تصريف التدفقات السائلة الخارجة من خزَّان التحليل (التخمير) باستخدام حفرة الامتصاص أو حقل التصريف الشبكي ، أو نقلها إلى تقنية معالجة أخرى عبر شبكات الصرف الصحي الخالية من المواد الصلبة .
يُتوقع - عمومًا - من الخزَّان المُصمم جيدًا والذي يتم صيانته جيدًا: إمكانية إزالة 50% من المواد الصلبة، و من 30 إلى 40% من الاحتياج الحيوي للأكسجين، وإزالة درجة واحدة لوغاريتمية 1-log removal (90%) من بكتريا الإشريكية القولونية E. coli. ولكن تختلف كفاءات الخزّانات بشكل كبير وفقًا للتشغيل والصيانة والظروف المناخية.
المُدخلات | المُخرَجات |
---|---|
المياة السوداء, المياة الرمادية , المياة البنية |
التدفقات السائلة الخارجة , الحمأة |
تُستخدم هذه التقنية في الأغلب على مستوى المنزل. وتصمم الخزَّانات الكبيرة والمتعددة الغرف لمجموعات من البيوت و/أو المباني العامة )على سبيل المثال، المدارس.(
يعتبر خزَّان التحليل )التخمير( مناسبًا في حالة وجود وسيلة للتخلص أو لنقل التدفقات السائلة الخارجة منه. إذا تم استخدام خزَّانات التحليل )التخمير(في المناطق ذات الكثافة السكانية العالية فيجب تجنب الارتشاح في الموقع، وإلا فإن الأرض ستصبح مشبعة بالمياه وملوثة، وقد ترتفع مياه الصرف الصحي إلى السطح، مما يشكل مخاطر صحية بالغة. لذلك يجب اتصال خزَّانات التحليل )التخمير( بإحدى تقنيات النقل، التي يتم من خلالها نقل التدفقات السائلة الخارجة لمعالجتها أو التخلص منها. وعلى الرغم من أن خزَّانات التحليل )التخمير( معزولة -غير مُنفذة للمياه - فإنه لا يفضل إنشاؤها في المناطق ذات المنسوب العالي للمياه الجوفية أو المناطق متكررة الفيضانات.
ينبغي تسهيل وصول شاحنات الشفط إلى موقع الخزَّان لأنه يجب إزالة الحمأة منه بانتظام. في بعض الأحيان يتم إنشاء خزَّانات التحليل )التخمير( في المنزل أو تحت المطبخ أو الحمام مما يُؤدي إلى صعوبة تفريغها.
يمكن إنشاء خزَّانات التحليل )التخمير( في أي مناخ، ولكن الكفاءة ستكون أقل في المناخات الباردة. كما أنها ليست فعالة في إزالة المغذيات ومسببات للأمراض.
يجب أن يحتوي خزَّان التحليل )التخمير( على غرفتين على الأقل. وينبغى ألا يقل طول الغُرفة الأولى عن 50% من الطول الكلي، أما في حالة وجود غرفتين فقط فينبغي أن يكون طول الغُرفة الأولى حوالي ثُلثي الطول الكُلي، حيث إن معظم المواد الصلبة تترسب في الغُرفة الأولى. يمنع الحاجز - أو الفاصل بين الغرف - خروج الخبث والمواد الصلبة مع التدفقات السائلة الخارجة. وكذلك تمنع أنبوب المُخرجات المُصمم على شكل حرف T من تصريف الخبث والمواد الصلبة.
تُعتبر إمكانية الوصول إلى كافة الغُرف )من خلال فتحات الوصول( ضرورية من أجل عملية الصيانة، ويجب تهوية الخزانات للتحكم في خروج الروائح والغازات الضارة.
يعتمد تصميم خزَّان التحليل )التخمير( على: عدد المستخدمين، كمية المياه المستخدمة للفرد الواحد، متوسط درجة الحرارة السنوية، معدل إزالة الحمأة، وخصائص مياه الصرف الصحي. ويجب أن يكون زمن البقاء لمدة 48 ساعة لتحقيق المعالجة المتوسطة.
يُوجد نوع آخر من خزَّانات التحليل )التخمير( يُعرف بخزَّان دورة المياة Aquaprivy، وهو عبارة عن خزَّان مُبسط للترسيب والتخزين، ويُوضع مباشرة أسفل دورة المياه بحيث تسقط فضلات الجسم فيه. وتُعتبر كفاءة خزَّان دورة المياه منخفضة في المعالجة.
في ظل ظروف التشغيل العادية لا يتلامس المستخدمون مع التدفقات السائلة الداخلة أو الخارجة. ويجب التعامل مع التدفقات السائلة الخارجة والخبث الطافي والحمأة المترسبة بحذر حيث إنها تحتوي على مستويات عالية من الكائنات الحية المسببة للأمراض.
ويجب على المستخدمين توخي الحذر عند فتح الخزَّان بسبب الغازات الضارة والقابلة للاشتعال المتوقع خروجها.
ينبغي - بسبب بيئته الحساسة - عدم تفريغ المواد الكيميائية المُركزة في خزَّان التحليل (التخمير)، كما يجب مراقبة مستويات الخبث والحمأة للتأكد من عمل الخزَّان بشكل جيد. ويجب -عمومًا- تفريغ الخزانات كل سنتين إلى خمس سنوات، وذلك يتم بشكل أفضل عن طريق استخدام تقنية التفريغ والنقل بواسطة المحركات ، وممكن أيضًا اعتبار التفريغ بالمجهود البشري كخيار.
ويجب فحص خزَّانات التحليل (التخمير) من وقت إلى آخر لضمان كونها معزولة -غير مُنفذة للمياه.
المياه ،الصرف الصحي النظافة الصحية وظروف الإقامة في السجون
الادارة الهندسية لمياة الصرف الصحى فى التجمعات السكانية الصغيرة
مدخل الى حوض التحليل الصحى
الدليل الارشادى لادارة المياة الرمادية على مستوى المنزل فى التجمعات السكنية الصغيرة فى البادية الشمالية الشرقية الاردن
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This paper presents a review on the septic tank and septic systems. Information on design and functional aspects, and environmental effects of septic tank systems are presented.
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This informed choice catalogue for community based wastewater treatment technologies helps to identify suitable sanitation options and facilitates the assessment of different sanitation system components with regard to stakeholder preferences. A powerful tool for technical bottom-up planning giving overall information about technical options at a "glance".
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Exhaustive report on technological, operational and economic aspects of decentralised waste water treatment systems. Spreadsheet examples support the reader in designing and planning waste water treatment systems components.
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This manual provides information on functionality of septic systems containing the modules septic tank and leach field and addresses the user at the household level. Construction, maintenance and operation are described.
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Different operation and maintenance options are presented with respect to sustainable plant operation, the use of local resources, knowledge, and manpower.
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This document on septic tanks gives guidelines on how to design and make a system.
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Technical information on environmentally sound technologies in wastewater treatment.
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Lecture notes on technical and non-technical aspects of sanitation systems in developing countries.
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Four-page factsheet by the United States Environmental Protection Agency (U.S. EPA), describing septic tanks, their applicability and the design of septic tank systems for household-level black and greywater treatment.
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Seven-page factsheet by the United States Environmental Protection Agency (U.S. EPA), describing the system, its applicability and the design of a leaching field following a septic tank.
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Ten-page factsheet by the United States Environmental Protection Agency (U.S. EPA), describing the system, its applicability and design of a septic tanks for large-flow applications.
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Booklet that describes how a septic system works and what homeowners can do to help their systems treat wastewater effectively.
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This site offers valuable information and resources to manage onsite wastewater systems in a manner that is protective of public health and the environment and allows communities to grow and prosper.