臭氧组合工艺深度处理焚烧垃圾渗滤液的研究

发布时间：2018-09-07 09:36

【摘要】：研究了单级臭氧(O_3)-生物活性炭(BAC)、两级串联O3-BAC、O3-Na2CO3混凝-BAC三种臭氧组合工艺深度处理焚烧垃圾渗滤液的二级生物处理尾水的效果。结果表明,在200mg O3/L的臭氧投加量下,两级串联O3-BAC对COD、UV254和色度的去除率分别为75.9%±2.1%、78.8%±2.9%和96.8%±0.9%,处理出水COD基本保持在100mg/L以下,色度低于40倍,满足排放要求;而单级O3-BAC对COD、UV254和色度的去除率分别为68.2%±1.3%、69.7%±0.5%和92.5%±1.1%,处理出水COD浓度保持在150mg/L左右,色度在60倍左右,不能达到排放要求。单级O3-BAC在290mg O3/L臭氧投加量下,才能达到两级串联O3-BAC在200mg O3/L的臭氧投加量下的污染物去除效果。此外,两级串联O3-BAC在臭氧投加量为200mg O3/L时,虽然对总氮去除效果差,但总磷去除率达到63.5%±4.4%,出水总磷浓度稳定在1mg/L以下,直接达到了GB16889-2008的排放标准。水中p H经两级臭氧氧化后都降低,经两级BAC处理后又升高。两级串联系统可以有效减少臭氧氧化生成的羧酸类物质在臭氧氧化塔中的积累,避免由此降低p H进而抑制羟基自由基的生成、影响臭氧氧化作用的发挥。臭氧氧化过程中容易形成磷酸钙、碳酸钙等物质,引起滤池堵塞,影响滤池运转。在臭氧-生物滤池工艺中增加Na2CO3混凝,可有效缓解生物滤池的结垢堵塞。O3-Na2CO3混凝-BAC对COD、TOC、色度有较好去除效果,能够达到《生活垃圾填埋场污染控制标准》(GB 16889-2008)。BAC为厌氧生物滤池时污染物去除效果优于好氧。但该系统TN去除效果有限,外加碳源有一定效果。臭氧和滤池处理后,有机污染物的GC-MS检测组分数和峰面积都大幅度下降,特别是芳香族化合物削减幅度明显;铁在处理过程中含量变化不大,钙、锌、锰和铜下降趋势明显。臭氧和BAC处理后,垃圾渗滤液的发光菌毒性、SOS/umu遗传毒性和斑马鱼早期发育毒性都有较大幅度降低,但系统出水中仍检出较强的SOS/umu遗传毒性和斑马鱼早期发育毒性,值得密切关注。
[Abstract]:The effect of two-stage series O _ 3-BACU _ 3-Na _ 2CO _ 3 coagulation-BAC combined with single stage ozone (O _ S _ 3)-biological activated carbon (BAC),) on advanced treatment of waste leachate incineration by two stage biological treatment was studied. The results showed that under the ozone dosage of 200mg O _ 3 / L, the removal rates of COD,UV254 and chromaticity by two-stage series O3-BAC were 75.9% 卤2.1% 卤2.9% and 96.8% 卤0.9%, respectively. The effluent COD was kept below 100mg/L and the chroma was less than 40 times. The removal rates of COD,UV254 and chromaticity by single stage O3-BAC were 68.2% 卤1.3% 卤0.5% and 92.5% 卤1.1%, respectively. The concentration of COD in treated effluent was about 150mg/L and the chroma was about 60 times, which could not meet the requirement of discharge. Under the ozone dosage of 290mg O _ 3 / L, single-stage O3-BAC can achieve the pollutant removal effect of two-stage series O3-BAC under the ozone dosage of 200mg O _ 3 / L. In addition, when the ozone dosage of two-stage series O3-BAC is 200mg O 3 / L, the removal efficiency of total phosphorus is 63.5% 卤4.4, and the effluent phosphorus concentration is stable below 1mg/L, which directly meets the discharge standard of GB16889-2008. The pH in water decreased after two stage ozone oxidation, and then increased after two stage BAC treatment. The two-stage series system can effectively reduce the accumulation of carboxylic acids produced by ozone oxidation in the ozonation tower, avoid the reduction of pH and thus inhibit the formation of hydroxyl radicals, and affect the exertion of ozone oxidation. Calcium phosphate and calcium carbonate are easily formed in the process of ozone oxidation, which causes blockage of the filter and affects the operation of the filter. Adding Na2CO3 coagulation to the ozonic-biofilter process can effectively alleviate the fouling blockage of bio-filter. O _ 3-Na _ 2CO _ 3 coagulating BAC has a better removal effect on COD,TOC, chroma. When GB 16889-2008 was used as anaerobic filter, the removal efficiency of pollutants was better than that of aerobic. However, the TN removal effect of the system is limited, and the addition of carbon source has a certain effect. After ozone and filter treatment, the GC-MS fraction and peak area of organic pollutants decreased significantly, especially for aromatic compounds, but the content of iron did not change, but calcium, zinc, manganese and copper decreased obviously. After the treatment of ozone and BAC, the toxicity of MSL leachate was decreased greatly, but the genotoxicity of SOS/umu and the early developmental toxicity of zebrafish were still detected in the effluent of the system, and the genotoxicity of SOS/umu and the early developmental toxicity of zebrafish were also detected. It deserves close attention.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703.1

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