活性水淬渣强化废水除磷性能及应用研究

【作者】 凌定勋；

【导师】 罗建中；

【作者基本信息】 广东工业大学 ， 环境工程， 2004， 硕士

【摘要】 本文首次将水淬渣应用于废水的化学除磷中，为开发一种新型的污水化学除磷技术奠定基础。水淬渣除磷技术是在化学除磷的基础上发展起来的一种新型的废水除磷方法。本文着眼于我国磷污染现状，针对低浓含磷废水处理时难以达标的现状而提出采用水淬渣作为滤料和除磷药剂进行化学过滤除磷的方法。 本实验以炼钢过程中产生的固体废弃物—水淬渣作为研究对象，研究水淬渣的除磷性能及除磷效果。在测定水淬渣的基本性质的基础上，通过实验考察了影响除磷效果的主要因素及其影响规律，进而进行水淬渣滤柱连续除磷实验，测定其相关的工艺参数，并对水淬渣的除磷机理作了探讨。 本文研究了进水TP浓度，pH，水淬渣粒度，反应时间等因素对于除磷效率的影响，同时还在连续性实验中考察了滤柱对于SS、CODcr、NH₃—N的去除规律。结果表明，水淬渣在进水高浓磷条件下有较大的除磷量，在进水低浓磷的条件下有高的去除率。水淬渣对于进水pH的波动有较好的承受能力，当进水pH在6～8之间变动时，出水pH保持稳定，且除磷率保持在一个较为稳定的范围内，水淬渣粒度越小，则磷的去除率越高，小于40目的水淬渣的除磷量可达144mg/g。废水与水淬渣的最佳反应时间的为15～25分钟之间。 为了进一步提高水淬渣的除磷容量，对水淬渣进行改性，首先对其进行表面处理，然后在水淬渣中添加激活剂，使水淬渣的潜在除磷能力得到充分发挥。在实验中主要考虑了不同的激活剂、不同的焙烧温度对除磷效果的影响。发现以三氯化铁作为激活剂、焙烧温度为450℃时的除磷效率最好。此种改性水淬渣的除磷容量为220.4mg／g。 为了实现其实际应用目的，以改性水淬渣作为滤料进行连续滤柱实验，得到一些极为有用的工艺运行参数，实验指出：在水淬渣滤柱中，流速为10m／h、水淬渣粒度为20～30目较好。除磷效率在85％以上，浓度降为0.5毫克以下。更多还原

【Abstract】 In this paper we bring forward that Fast Water Cooling Steel Waste Sediment(FWCSS) was applied to remove phosphor from wastewater, which is a new technology and was firstly used in practice. The theory of technology is based on the chemical-dephosphorization. Using FWCSS as filter-material and chemical-medicament to remove phosphor in chemical-filter-cylinder to treat the low concentration effluence which can not reach the standard of discharge with a view of the seriously phosphor polluting status in quo in our country.Using FWCSS which is one of byproducts (castoffs) from steel-making as studying objects in the experiment. First of all, we determined the essence of FWCSS, and then we studied the mostly factors and influence orderliness which affect the rates of dephosphorization by experiment; finally we made the dephosphorization mechanism study and discussion.Firstly we did experiment to study the TP concentration, pH, diameter FWCSS in influence and the reaction-time have effect on the rate of dephosphorization. Secondly we studied the removal orderliness of SS, CODcr, NH3-N in the filter cylinder in continuous experiment. The results show that: FWCSS has larger dephosphorization capacity in higher concentration of effluence, but larger rate of dephosphorization in lower concentration. FWCSS can keep steady dephosphorization rates when pH changing in effluence and keeping pH steadily in influence which ranged between 6 and 8. The diameter of FWCSS is smaller; the FWCSS dephosphorization capacity is larger. The best diameter’s capacity is 0.71mg/g and best reaction-time is 15~25 minutes .Then we added activation medicament into FWCSS in order to heighten the dephosphorization capacity. The activation medicament can inducted the latent dephosphorization capacity of FWCSS. We studied different activation medicaments, different temperature in incinerator, which has effect on the rate of dephosphorization. The results show that the best temperature is 450 C,the best activation medicament is FeCl3. At this condition the AFWCSS dephosphorization capacity is 1.025mg/g.In order to use it hi practice, we used the AFWCSS as filter-material to do the filter-cylinder experiment. And then we got some precious useful technique’s running parameter, the results show that velocity of flow is 1.4~ 1.5L/h, the diameter of FWCSS is 20~30M, the dephosphorization rate is above 85%更多还原