صافی میکربی گازهای فرار الی نفتی و صنعتی زیان اور متصاعد از فاضلاب

نوع مقاله : مقاله پژوهشی

نویسنده

یوسف جلالی

مهندس ارشد بازنشسته، حوزه‌های بهداشت شهرستان لس‌آنجلس. آمریکا.

10.22067/jacsm.2026.96404.1382

چکیده

بین سالهای ۱۹۹۳ تا ۱۹۹۵، عملکرد بیوفیلترهای متعارف و اصلاح‌شده برای پالایش گازهای بدبو و ترکیبات آلی فرار (VOCs) از فاضلاب شهری مورد ارزیابی قرار گرفت. بیوفیلترهای متعارف (با عمق ۰.۹۲ متر) بیش از ۹۵٪ سولفید هیدروژن و ۹۰-۶۵٪ از برخی هیدروکربن‌ها مانند بنزن را حذف کردند، اما در حذف ترکیبات هالوژنه‌ای مانند کلروفرم کاملاً ناموفق بودند.نسخه اصلاح‌شده با ایجاد یک لایه غوط‌ور در آب در پایین ستون و افزایش عمق کلی به ۱.۵۲ متر، عملکرد را به طور چشمگیری بهبود بخشید. این سیستم بیش از ۹۰٪ از بنزن، تولوئن و زایلن را حذف کرد و همچنین میانگین حذف ترکیبات سرسخت قبلی مانند کلروفرم و تری‌کلرواتیلن را به حدود ۷۵٪ رساند. مکانیسم کلیدی، ایجاد یک محیط بی‌هوازی در لایه آبی بود که مکمل محیط هوازی لایه بالایی شد. این امر منجر به ایجاد جامعه میکروبی متنوع‌تر و مسیرهای متابولیک بیشتر برای تجزیه مؤثرتر طیف وسیع‌تری از آلاینده‌ها، همراه با کاهش زمان انطباق و افزایش ثبات عملکرد شد.

کلیدواژه‌ها

بیوفیلتر

زیست‌پالایش

ترکیبات آلی فرار (VOCs)

فاضلاب شهری

بیوفیلتر اصلاح‌شده

حذف بو

جامعه میکروبی

رآکتور آبی

شرایط بی‌هوازی

تجزیه آلاینده‌ها

موضوعات

• انرژی های تجدید پذیر

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عنوان مقاله English

Biofiltration of Wastewater Gas Emissions to Remove Volatile Organic Compounds (VOCs)

نویسنده English

Yousef Jalali

Retired Senior Engineer, LA County Sanitation Districts. USA.

چکیده English

From 1993 to 1995, pilot tests evaluated conventional and modified biofilters for scrubbing odorous gases and VOCs from municipal wastewater. The conventional biofilters (0.92 m depth) removed over 95% of hydrogen sulfide and 65-90% of hydrocarbons like benzene, but were ineffective against halogenated compounds like chloroform. A modified version, featuring a submerged water layer at the bottom and an increased total depth of 1.52 m, significantly enhanced performance. This system removed over 90% of benzene, toluene, and xylene, and achieved around 75% average removal of previously persistent compounds like chloroform and trichloroethylene. The key mechanism was the creation of an anaerobic environment in the aqueous layer, which complemented the aerobic upper layer. This fostered a more diverse microbial community and a wider spectrum of metabolic pathways, enabling more effective breakdown of a broader range of pollutants. The modified design also reduced the microbial acclimation time and improved operational consistency, demonstrating superior overall treatment capability for complex VOC mixtures.

کلیدواژه‌ها English

Biofilter

Biofiltration

Volatile Organic Compounds (VOCs)

Municipal Wastewater

Modified Biofilter

Odor Removal

Microbial Community

Aqueous Reactor

Anaerobic Conditions

Pollutant Degradation

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