人工湿地模拟系统磷去除条件及效果研究

发布时间：2018-06-21 04:16

本文选题：人工湿地 + 磷吸附　；参考：《华中农业大学》2015年硕士论文

【摘要】：随着巢湖周边工农业的发展,大量含磷污染物排入其中,使其污染日趋严重,蓝藻水化等频繁发生。人工湿地处理系统是处理湖泊水体污染的一种重要方式。本课题以巢湖周边各种基质、水生植物、陆生植物等为研究对象,设计吸附柱室内模拟人工湿地系统除磷,研究基质厚度、进水碳磷浓度比、基质组合以及滞留时间对人工湿地除磷效果的影响,以期为巢湖低污染水体的处理提供技术支撑,主要研究结果如下:(1)对于土壤I(采自黄林头镇),添加5种植物粉末、碎屑浸提液并不能促进其对溶液中磷的吸附作用,反而会起到抑制作用;对于土壤II(采自青龙嘴镇),添加5种植物的粉末浸提液也会抑制其对溶液中磷的吸附作用,但是添加植物碎屑浸提液却能明显促进其对溶液中磷的吸附。(2)对于基质厚度的选择而言,70 cm以及50 cm基质层所对应的溶解态磷(SRP)去除率相似,两者SRP平均去除率均在55%左右,无显著差异,且二者显著高于30 cm层的44%,P0.01。三种不同厚度的基质对应的溶解性总磷(DTP)平均去除率无显著差异。故50 cm基质层厚度为最佳厚度。(3)对于进水碳磷浓度比而言,当各装置对SRP的去除趋于稳定时,未添加葡萄糖的装置SRP去除率最低为约50%,C/P为50/1以及100/1的装置对于SRP的去除率维持在70%左右,而C/P为150/1以及200/1的装置对于SRP的去除率保持在80%左右,C/P为250/1的装置对于SRP的去除率最高,为95%左右。总体而言,有外源葡萄糖添加的装置SRP去除率显著高于没有添加葡萄糖的,P0.05。DTP去除率情况与SRP相似。这说明在一定浓度范围内,C/P越大,越有利于装置对于水体磷的去除效果,最佳碳磷进水浓度比应为250/1。(4)对于组合基质而言,经过连续13周实验,在第12周时,空白+铁锰颗粒(CK+IM)以及空白+陆生植物碎屑+铁锰颗粒(CK+TP+IM)对SRP的去除率显著高于空白+水生植物碎屑(CK+AP)以及空白+藻类碎屑(CK+AL),在第13周时四者并无显著性差异;各装置对DTP的去除情况与SRP相似。综合分析可知,CK+IM为各组合基质中的最佳选择。(5)对于滞留时间而言,通过比较7种主要组合基质在3 h、6 h、9 h、12 h下的SRP及DTP去除率发现,3 h滞留时间所对应的磷去除率显著高于或等于其它滞留时间对应的P去除率。综合考虑实际情况中装置对单位时间内水体的处理量,滞留时间相对越短,其处理量越大,故3 h为其最佳滞留时间。
[Abstract]:With the development of industry and agriculture around Chaohu Lake, a large number of phosphorus pollutants are discharged into it, which makes the pollution become more and more serious, and cyanobacteria hydration occurs frequently. Artificial wetland treatment system is an important way to deal with lake water pollution. In this paper, various substrates, aquatic plants and terrestrial plants around Chaohu Lake are taken as the research objects. The adsorption column indoor simulated constructed wetland system is designed to remove phosphorus, to study the substrate thickness and the ratio of carbon to phosphorus concentration in the influent. The effects of substrate combination and retention time on phosphorus removal efficiency of constructed wetland were studied in order to provide technical support for the treatment of low pollution water in Chaohu Lake. The main results were as follows: 1) for soil I (collected from Huanglintou Town, five kinds of plant powder were added. The detrital extract could not promote the adsorption of phosphorus in the solution, but would inhibit the adsorption of phosphorus in the solution, and for soil II (collected from Azure Dragon), the addition of 5 kinds of plant powder extract could also inhibit the adsorption of phosphorus in the solution. However, the addition of phytoclastic extract could significantly promote the adsorption of phosphorus in the solution. The removal rates of dissolved phosphorus SRPs corresponding to the substrate thickness of 70 cm and 50 cm were similar, and the average removal rates of both SRP were about 55%. There was no significant difference between them, and they were significantly higher than that in 30 cm layer (P 0.01). There was no significant difference in the average removal rate of dissolved total phosphorus (DTP) among the three kinds of substrates with different thickness. Therefore, the optimum thickness of 50cm substrate layer is. 3) for the ratio of carbon to phosphorus concentration, when the removal of SRP tends to be stable, The SRP removal rate of the device without glucose was the lowest about 50% C / P 50 / 1 and the SRP removal rate of 100 / 1 was about 70%. The SRP removal rate of the device with C / P = 150 / 1 and 200 / 1 is about 80% and the highest removal rate of SRP is about 95% for the device with C / P = 250 / 1. In general, the removal rate of SRP in the device with exogenous glucose addition was significantly higher than that in P0.05.DTP without glucose addition. The removal rate of SRP was similar to that of SRP. This shows that the larger the C / P ratio in a certain concentration range, the better the removal effect of phosphorus in the water. The optimum ratio of carbon and phosphorus influent concentration should be 250 / 1.4) for the combined substrate, after 13 consecutive weeks of experiments, at the 12th week, The removal rates of SRP by CK IMM and CK TP IMI were significantly higher than those of CK APs and CK APs, but there was no significant difference among the four groups at the 13th week. The removal of DTP by each device is similar to that of SRP. Comprehensive analysis shows that CK IM is the best choice in each combination. By comparing the removal rates of SRP and DTP of 7 major combinations of substrates at 3 h, 6 h, 9 h and 12 h, it was found that the phosphorus removal rate corresponding to the retention time of 3 h was significantly higher than or equal to that of other retention times. Considering the actual situation, the shorter the residence time is, the larger the treatment capacity is, so 3 h is the best time.
【学位授予单位】：华中农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X524

【参考文献】