کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5743942 1412325 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
How durable is the improvement of environmental conditions in a lake after the termination of restoration treatments
ترجمه فارسی عنوان
بهبود شرایط محیطی در یک دریاچه پس از خاتمه درمان ترمیم، چقدر طول می کشد
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی

The study was conducted on Lake Długie,a water body lying in Olsztyn, a town situated in northeastern Poland. From 1956 to 1976raw wastewater was discharged into Lake Długie and therefore heavy pollution was the reason for the total degradation of this lake. The concentrations of nutrients were very high in the bottom water layer (TN 22.89 mg L−1, TP 3.50 mg L−1). The mean concentration of chlorophyll an exceeded 60 μg L−1 on average and Secchi disc visibility was less than 1 m. The discontinuation of sewage discharge into the lake caused the saprotrophic state to transform into hypertrophy. Further improvement of the environmental conditions in the lake was possible only after the implementation of an appropriate restoration method. The restoration procedure of this lake began in 1987. The first stage involved an artificial aeration method, and the second stage consisted of a phosphorus inactivation method. The applied restoration methods led to the improvement of Lake Długie's water quality. Even ten years after the restoration treatments ended, TP concentrations did not exceed 0.350 mg L−1, and TN - 3.0 mg L−1. Chlorophyll a contents oscillated in the range of 5-10 μg L−1, and Secchi disc visibility amounted to c.a. 4.5 m.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 104, Part A, July 2017, Pages 23-29
نویسندگان
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