污泥在人工鱼礁制备中的试验研究

为了有效地利用污泥以及促进人工鱼礁的发展,以污泥、水泥、贝壳粉为原料按照不同的水灰比和贝壳粉含量制作了人工鱼礁礁块并对其进行抗压强度、营养盐析出以及浸泡海水液pH的测试,同时用显微镜和X射线衍射对礁块水化产物进行微观分析。试验结果表明:在水灰比为0.5～0.6、贝壳粉含量为0.2～0.6的范围内,水灰比越低或贝壳粉含量越高均能使礁块的强度更高;礁块掺加污泥后可以不断析出NH~+_4和PO~(3-)_4且析出规律均为线性,但当材料比例改变时这种线性之间也会有差异;强度越高的礁块其浸泡海水液的pH越接近普通海水,亲水性越好;礁块水化生成钙矾石和C-S-H凝胶等是礁块强度的重要保障。该研究可为污泥的资源化利用以及人工鱼礁材料的新型开发提供思路和技术参考。

Experimental Study on Sludge Preparation in Artificial Reef

In order to effectively use sludge and promote the development of artificial reefs, artificial reefs were made from sludge, cement and shell powder as raw materials according to different water-cement ratio and shell powder content. The nutrient salt precipitation and the pH value of the soaked seawater were tested. The hydration products of the reef were microscopically analyzed by SEM and XRD. The test results show that: in the range of water-cement ratio 0.5 to 0.6 and shell powder content 0.2 to 0.6, lower water-cement ratio or higher shell powder content can lead to higher strength of the reef block; Adding sludge to reef blocks can continuously precipitate NH4⁺ and PO4^3-, and the precipitation law is all linear, but when the proportion of materials changes, there will be differences between these linearity; The higher the strength of the reef block, the closer to the PH value of the seawater immersed in ordinary seawater, the better the hydrophilicity; The formation of ettringite and C-S-H gel by reef block hydration is an important guarantee of reef block strength. This research can provide ideas and technical references for the resource utilization of sludge and the new development of artificial reef materials.