On the cleaning of waste water from textile factories using Pistia Stratiotes L.
Author(s)Khayitoy Yozil Kkasimovich
Keywordsbiological method, waste water, weaving factory, Pistia Stratiotes L., dissolved oxygen, permanganate oxidability, ammonia, nitrites, nitrates
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AbstractIn this article the study of the ecological and biotechnical features of cultivation of the aquatic plant — Pistia Stratiotes L. on the waste water from the weaving factories in the Buchara province. In the composition of the waste water there were not detected the dissolved oxygen; the average values of BOD 5 and oxidability were 155.4 and 115.1 mg 02/l, respectively, the smell was 5 points, the colour — from yellow to brown. In the result of cultivation of Pistia Stratiotes L. in the waste water of the weaving factory the quantity of the dissolved oxygen increased up to 8.0–10.0 mg/l, the quantity of BOD5 and oxidability decreased up to 14.4 and 21.0 mg 02/l, respectively — i. e., the complete absorption of the nitric compounds by plants has taken place. During the warm period of the year the efficiency of the waste water cleaning from the organic mineral pollution was about 95–99 % g.