Taranovskaya E.A., Sobgayda N.A., Alferov I.N., Morev P.V.
SEWAGE TREATMENT USING CHITOSAN ^{[№ 10 ' 2015]}
This paper studied the unique properties of chitosan and its use. The technology of obtaining chitosan from shellfish waste recycling field, ie the shell of walking limbs Kamchatka king crab. The characteristics of the chemical composition of the shell. Showing the steps of isolating chitin chemically — a stage of demineralization and deproteinirovaniya. The technology of chitosan production is the reaction from the cleavage of the structural unit of chitin acetyl groups represented in the article. Chitosan is obtained by the presented technology used for wastewater treatment from cations of heavy metals and suspended solids. We prove that the wastewater treatment from suspended solids using chitosan is more effective in a shorter period of time. Includes photographs of wastewater containing suspended solids without and after treatment with a solution of chitosan. Also investigated were the model waste water containing heavy metal cations (Cd²⁺, Pb²⁺, Zn²⁺), which was added to purify the chitosan solution in 2% acetic acid in different ratios. It was found that the optimal ratio of chitosan solution to the model drains is 10 ml per 1 000 ml of solution, further increasing chitosan supplements are not advisable. Efficacy effluent from heavy metal ions by chitosan is from 50 to 80 % and depends on the nature of the metal cation. The most effective wastewater treatment is achieved for cadmium cations.

Chirkova V.S., Sobgayda N.A., Alferov I.N., Rzazade F.O.
SEWAGE TREATMENT GALVANIZING PLANT (ON THE EXAMPLE LLC EPO "SIGNAL" ENGELS) ^{[№ 10 ' 2015]}
This paper studied the major environmental problems of mechanical engineering in Russia, the main ones being the wastewater etching and electroplating facilities. The analysis of the wastewater treatment system galvanizing plant engineering plants LLC EPO "Signal" (Engels, Saratov region). The main source of pollution of the environment in this production is the electroplating, which according to the FZ-116 on June 21, 1997 attributed to the hazardous production facilities. After chromium plating process produces waste water for cleaning the reagent used in the enterprise process (neutralization), whose efficiency reaches 60 %. The analysis of wastewater Ltd. EPO "Signal" after neutralization indicated that the content of heavy metal cations and oil discharge ratios than in urban sewer systems and requires additional purification. The article proposes to upgrade the existing wastewater treatment scheme Ltd. EPO "Signal", by using a reverse osmosis membrane and ozonation. Enhanced cleaning allow reduction of pollution to 95–98 %. Calculate the concentration of heavy metal cations in the effluent LLC EPO "SIGNAL" after a three-stage purification significantly lower limit values, which will provide closed water and use purified water for washing parts, as well as to eliminate the penalties to the company.