石灰稳定化污泥恶臭物质释放特征研究

利用污泥-石灰高效混合器制备5%、10%、15%石灰添加量的稳定化污泥,应用Jerome 631-X型便携式硫化氢测定仪、静态吸收等试验方法,分别研究了不同石灰添加比例下污泥还原性硫化物(RSCs)和氨(NH3)的释放特征,并对臭度进行了评价.结果表明:污泥中添加石灰后,RSCs体现出缓释特征;石灰稳定化污泥RSCs的释放量下降明显,连续监测380min后,石灰稳定化污泥处理的RSCs产生量相比等质量原泥处理降低了约85%;恒温培养24h,石灰稳定化污泥的NH3释放量(5.03×10-4mol)相比等质量原泥处理(7.00×10-6mol)提高了约72倍,明显促进了污泥氮向氨气的转化和释放.向污泥中添加少量工业石灰,均匀混合条件下,污泥的臭味强度明显降低,基本达到了抑制恶臭的目的.

Release character of offensive odorants produced from lime stabilizing sludge

Studies and offensive odorant analysis on RSCs and NH3 produced from sludge at 0,5%,10%,15% lime application rate,by using Jerome 631-X Hydrogen Sulfide Analyzer and static absorption test method respectively,were carried out under laboratory condition.Slow-release character of RSCs produced from sludge was observed after the lime was applied into sludge,and the application of lime decreased the production amount of RSCs from sludge,i.e.under the equiponderance condition,production value of RSCs from lime-stabilized sludge reduced to about only 15% of that from original sludge after 380 minutes,besides,under the equiponderance condition,release value of NH3(5.03×10-4mol) from lime-stabilized sludge was about 72 times of that(7.00×10-6mol) from original sludge after 12h incubation,as showed that lime amendment promoted the transformation and release of NH3 obviously.Furthermore,even a small amount of lime application could reduce the offensive odor intensity obviously,and the aim of odorant control could be achieved basically under the condition of highly mixing of lime and sludge.