Research On The Treatment Of High Ammonia Pharmaceutical Wastewater

For the high ammonia nitrogen pharmaceutical waste-water, due to the complexity of its composition and poor biodegradability, the traditional biological nitrogen removal process was not so good, so the combination process was often used to deal with those waste-water. This paper take a chemical synthesized pharmaceutical enterprise waste-water in Shandong Province as the research, using the coupled technology which combined the materialized?stripping +MAP?with biochemical ABR+A²/O. According to analyze the experiment of physical and chemical process, the results were as follows.?1?In the stripping experiment,the p H?temperature and gas-water ratio will affect the efficiency of ammonia nitrogen removal.The primary and secondary relationships of the effects are as follows: p H > temperature > gas-water ratio.The optimal experimental conditions are as follows:when the p H=11.0,temperature was 30?,gas-water ratio was 1600:1?aeration rate was 0.2m³/h?stripping time was 4h?,the removal rate of ammonia nitrogen could reach 84.56%;The experimental results of the effects of organic matter on the efficiency of the waste-water stripping which primary and secondary relationship was SDBS>ethyl lactate>triethanolamine> acetic acid>ethanol>CTAB.In the technology condition of p H=11.0,temperature was 2?9 ?,aeration rate was 0.2m³/h,stripping time was 4h? gas-water ratio was 3200:1?,with dosing a certain percentage of organic matter in the waste-water which was SDBS:CTAB:ethyl lactate:ethanol:triethanolamine:acetic acid=3 : 2 : 3 : 2 : 1 : 0.5,the ammonia nitrogen removal rate would reach the maximum value of 87.61%.?2?The primary and secondary relationship of the MAP experiment was p H>Mg/N>P/N.In the condition of p H=9.0?9.5?Mg/N=1.2 : 1?P/N=1 : 1,the residual ammonia nitrogen concentration could reach 147.89 mg/L,the removal rate of ammonia nitrogen was 96.12%,while the stock solution ammonia concentration was 3811.71 mg/L;Through set up different experimental conditions,with the aid of XRD the generation effect of crystal type of Mg NH₄PO₄·6H₂O was analyzed preliminarily.Contrast the Removal rate of ammonia nitrogen,results show that there was no direct correlation in MAP reaction between the ammonia nitrogen removal rate and the rate of crystal formation.In addition, the types and contents of the sediments were different in different conditions, the removal effect of ammonia nitrogen does not necessarily increase with the crystallization become better.?3?In composite stripping process,with the condition of p H=10.5?11.0?aeration time was 4h?gas-water ratio was 3200 : 1?temperature was 30?,the ammonia nitrogen concentration of influent was 44500 mg/L and the effluent ammonia nitrogen concentration was 2800 mg/L while the removal rate was greater than 93%.The effluent CODcr increased to about 41000 mg/L;In the MAPprocess,adjusted the p H = 9.0 ? 9.5, slowly add the dose of experiment proportion,the ammonia nitrogen concentration of influent-water was about 2800 mg/L,the effluent-water about 420 mg/L and the ammonia nitrogen removal rate was more than 85%.?4?After mixed low concentration waste-water,the ABR reactor p H of influent was controlled in 6.8?8.0,the ammonia nitrogen and CODcr concentration of influent was about 84 mg/L and 8200 mg/L respectively.When the effluent ammonia nitrogen concentration increased to about 180 mg/L because of the existence of organic nitrogen in water.The concentration of effluent CODcr was1200 mg/L and removal rate was greater than 85%;The A²/O reactor's ammonia nitrogen and CODcr concentration of influent was about 180 mg/L and 1200 mg/L respectively.After treating by A²/O process,the effluent ammonia nitrogen concentration was degraded to about 18 mg/L and the removal rate was about 88%,the effluent CODcr concentration was degraded to about 90 mg/L and the removal rate was greater than 92%.