Experimental Study Of The Ozone Oxidation Sludge

China’s rapid development of sewage treatment and plants is rapidly increasing.Activated sludge processing means most of the sewage treatment plant sludge, becauseof its large, treatment and disposal problems have become increasingly prominent. Thismakes the sludge reduction became a necessity. Ozone sludge reduction technologydoes not produce toxic or harmful by-products, the crack high efficiency, lower energyconsumption, is the focus of research in the field of sludge reduction.This test uses ozone catalytic device which by myself. Effects of different sludgeconcentration and different concentrations of ozone, ozone the catalytic device sludgecrack, and explores the impact of ozone oxidation of sludge and mixture properties.Obtain the following main conclusions:Ozone sludge contact reaction apparatus in the ozone concentration10mgO₃/gMLSS,20mgO₃/gMLSS,30mgO₃/gMLSS. The ozonation time50minconditions under, examines the initial sludge concentration was2000mg/L,4000mg/L,6000mg/L,8000mg/L,10000mg/L of the sludge cracking process. Ozoneconcentrations, ozone oxidation time and sludge concentration on the effects of ozoneoxidation. Results showed that, before10min in the ozonation process, the sludgeconcentration declined sharply,20mgO₃/gMLSS ozone concentration sludge cracks ratereached50%, the sludge cracks rate reaches83%or more ozone concentration under30mgO₃/gMLSS, but within50min sludge can be oxidized to crack completely.Elevated the sludge the cracks rate with the increase in the time of ozonation, the higherthe ozone concentration, the same period of time corresponding to the sludge cracks rateis also higher. Overall, the ozone oxidation time of30min after oxygen crack to enhancethe effect of not more than. Concentrations of ozone and ozone oxidation time thesludge crack had significant effects. In contrast high concentrations of sludge sludge ismore conducive to crack, have a higher rate of crack reactor in higher sludgeconcentration.Ozone concentration10mgO₃/gMLSS, the ozone oxidation time20min conditionsinvestigated the initial sludge concentration of2023mg/L,4068mg/L,6128mg/L,8044mg/L ozone oxidation sludge Characters. The results show that theMLSS, SV30with sludge cracks degree increases and decrease in sludge volume indexis also reduced, and the sludge concentration is higher the lower the slower the rate. Using a scanning electron microscope, and observed the damage of the ozone on thecell surface of the sludge microorganisms.In an ozone concentration of10mgO₃/gMLSS,20mgO₃/gMLSS,30mgO₃/gMLSSozonation time for60min under the conditions investigated the initial sludgeconcentration was2000mg/L,4000mg/L,6000mg/L and8000mg/L, when the mixtureof water quality characteristics. The sludge never oxidized to crack completely, SCODtrend of increasing concentrations from115²21mg/L up to430⁷15.5mg/L. Growth isdivided into two phases, the first phase （20min） higher growth rate of8.7¹9.6mg/（min L）, the slowdown in the growth rate of the second stage （20to60min）of1.1⁵.4mg/（min L）. NH₄⁺-N concentration decreased in5¹0min, then increased.NH₄⁺-N concentration from37.0³8.2mg/L were from in5¹0min down to35.9³6.5mg/L last raised to41.5⁵1.7mg/L. Polysaccharides, TN concentrationshowed a gradual upward trend. The polysaccharide concentration from0.5².6mg/L upto35.9⁷4.1mg/L, TN concentration from37.3⁴3.1mg/L upgrade to56.1⁷6.3mg/L.The higher the concentration of ozone,SCOD, NH₄⁺-N, polysac-charides, TN concentration of the growth rate of the lower. NO₃^--N, TP concentrationshowed a gradual upw-ard trend. NO₃^--N concentration from0².1mg/L up to5.6⁸.7mg/L, TP concentr-ation from0.8¹.8mg/L up to7.9²1.2mg/L. The higher the ozoneconcentration, the higher the growth rate of NO₃^--N, TP concentration.