A novel two-phase method has been proposed to remove as well as to recover phenolic materials from aqueous alkaline waste streams. This is based on the reaction of phenolic materials with substances such as benzoyl chloride, p -toluenesulfonyl chloride, etc. dissolved in a water-immiscible solvent such as toluene in the presence of a phase transfer catalyst. In a continuous reactor-settler arrangement it was possible to bring down the phenol content of an aqueous alkaline stream from 2035 ppm to 45 ppm with phenol recovered as phenyl benzoate. Won, K. W.; Prausnitz, J. M. J . Chem. Thermodyn. 1975, 7 , 661.

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A new extraction-spectrophotometric method for the determination of indium at ppb level in zinc effluent is described. It is based on quantitative extraction (51.2-99.2%) of the tetrabromoindate complex with toluene solution of N,N'-diphenylbenzamidine and its nine analogous from sulphuric acid solutions, which allowed the extract to react with basic dye (i.e. brilliant green, malachite green, crystal violet) solution in sequence. Among the basic dyes tested, brilliant green gave the most sensitive colour reaction. The value of molar absorptivity of the amidine bromoindate extracts with brilliant green lie in the range of (0.53-1.03)×10(5) l mole(-1) cm(-1) at absorption maximum, 630-640. With the most sensitive compound, N-(2-methyl-phenyl)-N-phenylbenzamidine(APPBA), the detection limit of the method is 13 ppb. The method is free from interferences of almost all ions associated with indium. The method has been applied for the determination of indium to zinc-effluent.

Adsorption of catonic and heavy metal onto coconut husk as a low cost adsorbent was studied as a fuction of amount of adsorbent,Ph,contact time and concentration.it was found that percentage adsorption varied linearly with the ph and adsorption dose but varies nonlinearly with contract time.Coconut husk was collected near achlechwar temple(shiv temple) Gwalior m.p india. near achlechwar temple generated 2600kg of coconut husk waste per month which create tremendous problem in environment. As our honorable prime minister shri narendra modi more focus on clean and green india for this an effective adsorbent was developed by coconut husk waste which not only eradicate heavy metal but also removed harmful impurities from waste water. Adsorption is best way for effective purification and separation technique used in industry especially in wastewater treatments. Cost is an important factor for comparing the adsorbent materials. Therefore, there is increasing research interest in using alternative low-cost adsorbents. To removing this heavy metal activated charcoal as a good adsorbent but it is quite costly.The experiment result shows the maximum removal of copper by coconut husk adsorbent is 89%.