تكلور مياه البلديات وتعقيمها
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التدخل الصحي العام الذي أنقذ ملايين الأرواح
نظرة عامة
Water chlorination is the most widely used method for disinfecting municipal drinking water, credited with virtually eliminating waterborne diseases such as cholera, typhoid, and dysentery in developed countries. The process adds chlorine gas, sodium hypochlorite, or calcium hypochlorite to water, forming hypochlorous acid which destroys pathogenic bacteria, viruses, and protozoa. First applied in Jersey City, NJ in 1908, chlorination has been called the most significant public health advancement of the 20th century.
العملية الكيميائية
Chlorine is added to treated water at 0.5-4 mg/L dose. It reacts with water to form hypochlorous acid (HOCl, the primary disinfectant) and hydrochloric acid. Breakpoint chlorination oxidizes ammonia and organic compounds first, then provides free chlorine residual for distribution system protection. Contact time of 15-30 minutes at the treatment plant ensures adequate CT (concentration x time) for disinfection.
HOCl <=> H+ + OCl- (pKa = 7.5, HOCl is 80x more effective than OCl-)
HOCl + pathogens -> oxidative destruction of cell membranes and nucleic acids
المواد الخام
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Chlorine gas (Cl2) — Chlor-alkali electrolysis of NaCl brine (Disinfectant (large systems))
-
Sodium hypochlorite (NaOCl, bleach) — Chlorination of NaOH (Disinfectant (small/medium systems))
-
Calcium hypochlorite (Ca(OCl)2) — Chlorination of Ca(OH)2 (Disinfectant (emergency/remote applications))
المنتجات النهائية
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Disinfected drinking water — Municipal water supply (Free chlorine residual 0.2-0.5 mg/L at tap)
Environmental Impact
Chlorination produces disinfection byproducts (DBPs) including trihalomethanes (THMs) and haloacetic acids (HAAs) when chlorine reacts with natural organic matter. Some DBPs are suspected carcinogens. Residual chlorine can be toxic to aquatic organisms in wastewater discharge. Despite these concerns, chlorination's public health benefits vastly outweigh the DBP risks.
اعتبارات السلامة
- ⚠ Chlorine gas is extremely toxic (LC50 ~293 ppm) -- lethal at low concentrations
- ⚠ Gas cylinder handling requires specialized training and equipment
- ⚠ Mixing hypochlorite with acids produces lethal chlorine gas
- ⚠ Calcium hypochlorite is a strong oxidizer -- fire and explosion risk with organics
الابتكارات الحديثة
Chloramine (monochloramine) disinfection produces fewer THMs while maintaining longer residual.
UV disinfection and ozone treatment used as primary disinfection with chlorine as secondary.
On-site sodium hypochlorite generation from salt electrolysis eliminates chlorine gas handling risks.
حجم الإنتاج
5000000
طن/سنة
$8 billion
القيمة السوقية
المزيد في %(name)s Environmental & Water Treatment
إزالة الكبريت من غازات المداخن (الغسل الرطب بالحجر الجيري)
Global Industrial Scale
المعالجة الحيوية للتربة الملوثة بالبترول
Commercial Production
امتصاص الكربون المنشط لتنقية الماء والهواء
Global Industrial Scale
تحلية ماء البحر بأغشية التناضح العكسي
Global Industrial Scale
ترسيب المعادن الثقيلة من مياه الصرف الصناعي
Global Industrial Scale
تليين الماء وإزالة الأيونات بتبادل الأيونات
Global Industrial Scale
معالجة الماء بالأوزون والأكسدة المتقدمة
Commercial Production