The aim of this paper was to accurately analyze the sources of water pollution and loading concentrations in textile finishing mills. A process data collection was performed and integrated with a characterization of the process effluents in terms of treatability and reusability. In order to evaluate properly the wastewater loading, an analysis course was set. The samples have been gathered for two months; instantaneous samples (PI) were drawn from the wastewater, as well as from the painting baths, at the time of the overflow. Based on several daily average values, a general average (PG) has obtained. The experimental data were statistically analyzed and the average values of the investigated parameters for each collecting point corresponding to the sectors of the finishing section were assessed..

Taking into account the statistical data gathered in two previously published papers concerning the pollution sources in the production sector, namely Finishing section, various solutions are proposed for wastewater treatment. Bearing in mind the results obtained through the sampling method on different types of water in the urban sanitary sewer system, the conclusion was that the most convenient alternative, besides the source control is the treatment in wastewater treatment plants. This is due to the wastewater recycling systems which no longer ask for the optimization of the dilution treatment, through water supply from other systems. A chart of the reengineered sewage treatment works was also proposed.

There are many treatment methods used to remove color from textile wastewater, and Fenton oxidation, a well known Advanced Oxidation Process is one of the most efficient. Apart of Fe(II), other metal ions have been used as catalysts in Fenton's Reagent, and Cu(II) proved to be a good alternative. In this study the effect of the concentration of dye, catalyst and hydrogen peroxide were studied and optimized for the discoloration process of Reactive Black 5 using a Fenton-like process, H 2 O 2 /Cu(II) type. The experimental results were subjected to multiple linear regression analysis using MINITAB 16 software. The experimental data fitted to the second-order model, showing good regression prediction as the value of the coefficient of determination was high (R 2 = 0.9843). ANOVA showed that all three independent variables significantly affected the color removal. The significance of variables affecting the discoloration process and the possible relationships between them, whether antagonistic or synergistic, has been evaluated using the Response Surface Methodology (RSM). Optimum conditions indicated by the regression model for achieving maximum decolorization were found as: dye concentration 7.8 mg/L, catalyst concentration 1.52 mM and hydrogen peroxide concentration 14.68 mM. The maximum color removal was 92.278% at optimum conditions.

This study shows the dyeing behaviour and impact over the wastewaters quality resulted from dyeing wool fibres, of a new synthesized premetalated dyes, derived from new acid dye, sodium(E)-2-((1-amino-4-sulphonatonaphthalen-2-yl)diazenyl)-6methoxybenzo[d]thiazole-5 or 7-sulphonate, as a result of interaction with Ni(II) and Zn(II) ions. In order to characterize the complexed dyes they were studied in both phase: solution and solid phase. The dyeing performances assessment and the environmental impact has been made by a comparative study between the obtained results with complexed dyes and uncomplexed dyes. Applying and testing dyes at two different values of acid medium (pH=2 and pH=5) has been performed by two procedures: with the complexed dyes formation on the fibres in the process bath and their preformation in solid phase.

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Due to high energy costs and the rising consciousness of energy issues in the textile industry, saving energy became a significant problem. Since a large amount of the energy required in textile finishing is needed in the form of steam for various processes, recovering wastewater heat has great potential for cost reduction. In this research, it was studied the heat recovery from cellulosic textiles finishing wastewater, based on a case study in a textile company. After examining the wastewater collection system (in terms of both flow and temperature), heat recovery solutions have been identified. To recover the waste heat, we decided to install a heat pump that functions as a heat exchanger and can be used to heat the industrial water used for supply technological steam generator. The paper presents the current circuit of steam production, as well as the modified circuit for the implementation of the heat pump. Heat Pump installation scheme is presented in detail, considering that wastewater cannot be entered directly into the pump. Economical and environmental advantages of implementing such heat pump have been analyzed.