ارزیابی کیفیت میکروبی پساب و لجن دفعی از چهار تصفیه خانه فاضلاب موضعي شهر تهرانMicrobial quality assessment of disposal effluent and sludge from four decentralized wastewater

مهدي فرزادكيا, رويا ميرزايي, مينا غفارخاني, فاطمه باقري

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چکیده

ABSTRACT

Background and Aims: Lack of adequate supervision on the quality of disposal effluent and sludge from

wastewater treatment plants (WWTPS) caused to their discharge by many pollutants into the environment.

This study aimed to assess the microbial quality of disposal effluent and waste sludge from decentralized

WWTPS in Tehran.

Materials and Methods: This cross-sectional study was performed in 12 months on disposal effluent and

sludge from 4 decentralized WWTPS in Tehran city. Random sampling was conducted at a monthly period.

The microbial quality of disposal effluent and waste sludge were compared with the guidelines of Iranian, and

United States Environmental Protection Agency (USEPA), respectively.

Results: Effluent and sludge output from these plants typically were used for agricultural purposes. None

of the samples of effluent meet Iranian environmental standards. Microbial quality of waste sludge from

Shahrak Gharb and Ekbatan WWTPS were higher than class B of USEPA guidelines but, waste sludge from

Gheitarieh and Shoosh WWTPS meet this index.

Conclusion: At the present time, reuse of effluent and waste sludge from decentralized WWTPS in Tehran

city were performed without any health considerations. This is a serious threat to public health; hence,

executive and regulatory agencies must take action corrective measures and controls necessary in this regard

as soon as possible.

Key words: : Microbial quality, effluent, sludge, wastewater treatment plants, Tehran city

*Corresponding Author:

Associate professor, Department of Environmental Engineering, School of Public Health, Iran University of Medical

Sciences, Tehran, Iran

Tel:+982188779118

Email: mahdifarzadkia@gmail.com

Received: 28 Oct. 2013

Accepted: 13 Jan. 2014

تمام متن:

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