Phenolic compounds as c 4 h 2 oh mgl 5 nanochemicals

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Phenolic compounds (as C 4 H 2 OH) (mg/L) 5 Nanochemicals and Ef fl uent Treatment in Textile Industries 67
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4.2 Standards for Various Pollutants Present in Textile Ef fl uent in Germany The standards for various pollution parameters in textile industry ef fl uent Germany is shown in Table 6 . 4.3 Standards for Various Pollutants Present in Textile Ef fl uent in the USA The EPA publishes the ef fl uent requirements using best practical control tech (BPT) in the USA, the details of which have been shown in Table 7 . Table 5 Ef fl uent standards for textile industries in Tamil Nadu, India Parameter Concentration not to exceed, milligram per litre (mg/l), except pH pH 5.5 9.0 Total suspended solids 100 Biochemical oxygen demand (BOD) 30 Chemical oxygen demand (COD) 250 Total residual chlorine 1 Oil and grease 10 Total chromium as Cr 2 Sulphide as S 2 Phenolic compounds as C 6 H 5 OH 1 Source Standards for Discharge of Trade Ef fl uents into Inland Surface Waters, Tamil Nadu Pollution Control Board (2015) Table 6 Pollution standards for textile industry in Germany (Wang et al. 2011 ) Serial number Parameters The limits of discharged concentration (mg/L) 1. COD 160 2. BOD 25 3. TP 2.0 4. TN 20 5. NH 3 10 6. Nitrite 1.0 68 P. Senthil Kumar et al.
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5 Conventional Treatment Methods The wastewater ef fl uent from textile dyeing and printing process contains large concentration of organic matter, most of which is dif fi cult to degrade. The released ef fl uent has high BOD and COD content which can be perilous to the state of aquatic life and further to human health. For instance, the presence of coloured water does not allow penetration of light and therefore restrains growth of life and the presence of phosphorus can accelerate Eutrophication. In order to check the adverse effects of these toxic chemicals in the discharged ef fl uent, it is important to establish suitable treatment methods for textile wastewater. The conventional treatment techniques that have existed in the past few decades include physicochemical treatment methods, biological treatment and tertiary treatment methods which employ a combination of methods. 5.1 Physicochemical/Primary Treatment 5.1.1 Screening Treatment of wastewater involves a series of unit processes some of which are physical, chemical and biological in nature. An industry releases different streams from different points at different times, and hence, the fi rst step in treatment of wastewater is to mix and equalize these streams. Some industries use screening process and oil trap processes before mixing various streams. Screening involves the use of meshes and sieves of appropriate size to hold back the grit and the undissolved large particulate matter or debris. Oil trap follows the same function but with the purpose of adhesion separation and removal of oil and grease.
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  • Fall '19
  • N. Gokarneshan

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