The Experimental Study On Civil Explosive Products Wastewater Treatment Process

DDNP (Diazodinitrophenol) wastewater composition is very complex, high organiccontent, toxicity, chroma and poor biodegradability. Emulsion Explosive wastewater is highin ammonia and total nitrogen. Its nutrient is imbalanced. It is a typical low-carbon nitrogenwastewater. The issue of water quality characteristics based on the experiment wasexploring two wastewater pretreatment processes, and look for a more reasonablebiochemical system process.（1）Studied the magnesium ammonium phosphate precipitation method and airstripping method of ammonium nitrate wastewater treatment. The average concentration ofammonia nitrogen in raw water was2671mg/L.①The optimum reaction conditions of airstripping method: pH=10.5-11.0, temperature20-30℃and stripping time is7h. Underthese conditions, the removal rate of up to about55%.②The optimum process conditionsof MAP method: pH=11.0, Mg/N=1.6, P/N=1.2. Under these conditions, the removal ratereached up to58%. The characteristics of MAP treatment process: faster response time,high economic costs, effluent phosphate difficult to control.（2）Studied microelectrolysis, Fenton, acid precipitation method, micro-electrolysis+H2O2to pretreat DDNP wastewater. The COD concentration of DDNP raw water is2200-2500mg/L.①Microelectrolysis optimal reaction conditions: pH=2, Fe dosage was45g/L, Fe/C=3/2, reaction time was60min. Under these conditions, the removal ratereached up to50%. Fenton optimal reaction conditions：pH=6,H2O2dosage10mL/L,H2O2/Fe=3/2(molar ratio),that is to say, Fe2+concentration was0.1mol/L and thereaction time was about60min. Under these conditions, the removal rate reached up to88%.The color can be reduced to about50times. Using the micro electrolysis+H2O2combinedmethod to treat DDNP wastewater, the best dosage of H2O2was4mL/L, COD removal ratewas87.53%. As can be seen from the ultraviolet spectrum, wastewater chromophoresignificantly reduced and absorption decreased. The effluent was more clearly.（3）The biochemical stage take the double A/O combined process. Studied theremoval rate of ammonia; nitrate;and COD in biological system. To make a detailedanalysis of the treatment effect at all levels. Biochemical system for ammonia removal rateremained above99%, the effluent ammonia is very low. Effluent COD concentration wasless than100mg/L and it was stably. The average removal rate of nitrate nitrogen systemwas74.4%.COD and ammonia levels reached the national emission standards. Optimumreflux ratio was2/1. Denitrification optimal control of temperature was30-35℃. At the same time, this paper studied the impact of changes in second levels EGSB of organic loadon the denitrification effect.