固定化微生物技术在湖塘水体原位修复中的应用研究

发布时间：2017-12-31 01:38

本文关键词：固定化微生物技术在湖塘水体原位修复中的应用研究　出处：《广西大学》2015年硕士论文　论文类型：学位论文

【摘要】：富营养化状态的持续发展会从根本上改变湖塘生态系统健康运转的初级生产力结构,导致湖泊生态系统结构和功能退化,破坏生态平衡。本课题针对富营养化水体原位修复的困难,设计制作一型可用于城镇封闭式富营养化浅水湖塘水体的固定化微生物原位修复装置,利用固定化微生物技术生物浓度高,环境适应性强的特点,大量去除水体中的氮、磷和有机物,借助底泥中氮、磷模拟释放实验、水体模拟修复实验确定工艺参数,中试试验获取稳定的修复效果后,成功运用于农村水环境治理和城镇景观水体修复示范中。主要的结论为：(1)当水体为中性时,湖塘底泥中氮、磷的释放对上覆水体中COD、 NH3-N和TP浓度的影响最小。以去离子水为上覆水的氮、磷释放实验中,水体pH=7时,释放后上覆水中NH3-N浓度为1.86mg/L, TP浓度为0.09mg/L,两者均为各实验组最小值,这与在湖塘水调整pH模拟释放验证实验中的结果一致。(2)水体模拟修复实验中,载体柱设置深度和环境水体的pH对处理效果有显著影响。设置于半水深时COD去除率为46.6%,NH3-N去除率为60.4%,优于布设在水底部时的效果；环境水体的pH为7.0～8.0时,固定化微生物对COD和NH3-N的处理效果最好,去除率分别为47%和80%；固定化微生物填料使用量对水体修复效果影响的实验中显示,填料量的增加可以提高其对于水体中COD、NH3-N、TP的去除速率和去除量。(3)城镇封闭式浅水湖塘水体修复中试试验的结果肯定了该型固定化微生物原位修复装置对的水体中COD, NH3-N和TP的去除效果。两阶段的修复结束后,水体中COD, NH3-N和TP浓度显著下降,其中COD和TP浓度20.1 mg/L,0.1 mg/L接近地表水环境质量标准(GB3838-2002)中Ⅲ类水质的要求,达到了预期目标。(4)在为期一个月的农村水环境治理和五个月的城镇景观水体修复示范项目中,该型固定化微生物原位修复装置运行稳定,效果显著。其中经过修复后的稳定塘水中COD, NH3-N和TP的浓度为18mg/L,1.7mg/L,0.2mg/L,景观湖塘中COD, NH3-N和TP浓度下降至12.5mg/L,1.3mg/L,0.11 mg/L均达到或者接近地表水环境质量标准(GB3838-2002)中Ⅴ水质的要求,水体功能得到恢复。
[Abstract]:The sustainable development of eutrophication will change the primary productivity structure of Hutang ecosystem health operation fundamentally, leading to the structure and function of the degradation of lake ecosystem, destroy the ecological balance. The topic for the in situ remediation of eutrophic water difficult to design a type can be used in the town closed shallow eutrophic lake Hutang fixed microbial remediation device using immobilized microorganism biological characteristics of high concentration, strong adaptability to the environment, a large number of removal of nitrogen, phosphorus and organic matter in the sediment, with nitrogen, phosphorus release simulation experiments to determine the process parameters to repair the experimental water simulation test for repair effect is stable after successful application in the rural governance and the restoration of water environment of urban landscape water demonstration. The main conclusions are as follows: (1) when the water is neutral, nitrogen and phosphorus in the sediment of Hutang, released to the overlying water In COD, NH3-N and TP. The minimum concentration with deionized water as the overlying water nitrogen, phosphorus release experiment, water pH=7, after the release of the overlying water NH3-N concentration is 1.86mg/L, the concentration of TP was 0.09mg/L, both of which are the minimum value of each experimental group, and the adjustment of pH simulation in Hutang water release verify the consistency of the results. (2) repair water simulation experiment, carrier column setting depth and water environment of pH has a significant influence on the treatment effect. Set in half depth COD removal rate is 46.6%, the removal rate of NH3-N was 60.4%, better than in the bottom of the layout; environmental water pH is 7 to 8, the best treatment effect on COD and NH3-N immobilized microorganism, the removal rates were 47% and 80%; that of immobilized microorganism additive usage effect on the effect of water restoration experiments, the increase of filler amount can improve its water for COD, NH3-N, TP. Removal rate and removal rate. (3) the town closed test of shallow water in Hutang repair results confirmed the type of immobilized microorganism in situ repair device on the COD in the water, the removal effect of NH3-N and TP. The two stage of the repair after the water in COD, NH3-N and TP concentrations decreased significantly, which COD and TP concentration of 20.1 mg/L, 0.1 mg/L close to the surface water environment quality standard (GB3838-2002) quality class III requirements, to achieve the expected goal. (4) in the urban landscape water restoration demonstration project of rural water environment treatment for one month and five months, the immobilization of microorganisms in situ repair operation the effect is significant. The device is stable, stable after COD repair after the pond water, the concentration of NH3-N and TP for 18mg/L, 1.7mg/L, 0.2mg/L, NH3-N and COD in the landscape of Hutang, the concentration of TP decreased to 12.5mg/L, 1.3mg/L 0.11, mg/L reached to or close to the surface water environment The water quality is restored in the quality standard (GB3838-2002).

【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X524

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