Greywater pollution variability and loadings.

In measuring the chemical oxygen demand(COD) of water samples by dichromate method,mercury sulphate which reacts with the chloride ions to form a solvable chloride-mercury complex was added into sample solution to remove the interference of chloride ions.In this paper,by investigating the mechanism of chloride disturbing,a new analysis method which use silver nitrate instead of mercury sulphate is proposed.The method has been applied in the analysis of waste water produced by Binhua Group and the results are consist with those obtained mercury sulphate method,and the relative deviation for 6 times analysis of COD is 2.2 %.The applications of this method to the treatment and recovery of waste water were also investigated.The methods of the recovery of silver,chromium, ferreous and the purification of silver are proposed.The method provides precise results,solvents-saving,and without mercuric pollution.

Determination of chemical oxygen demand of high concentration chloride water samples by silver precipitation and dichromate method

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Determination of chemical oxygen demand of high concentration chloride water samples by silver precipitation and dichromate method