Studies on the development and utilization of weed control malerials made from sludges issued from water purification process and their absorbing capacity of pollutant air

自来水厂净水过程中排出的污泥被归类为工业废物，一般采用中空填充法进行回收利用。然而，污泥主要由粘土等矿物土质和漂浮在河水中的微生物有机物组成。从另一个角度看，污泥可以作为有用的土壤资源。从循环利用的角度来看，部分污泥已尝试用作植物播种的床土材料。本研究旨在研制和利用具有从污泥中吸收酸性污染物空气的除草材料。研究结果如下：1.研究结果。杂草防除材料(WCM)是将湿污泥制粒到直径3 mm后干燥而成。WCM具有较低的润湿性和较高的透水性。当土壤表面覆盖水分复合膜时，由于…，水分复合膜的上层长期保持干燥。更多的是低润湿性和高透水性。这些特征被认为与WCM一样有效。在WCM的分枝过程中，通过将具有化感作用的植物动力与污泥混合，大大提高了WCM对土壤杂草出苗的抑制能力，咖啡渣、木瓜和森岛金合欢叶的动力被发现是有用的植物材料。非禾本科植物的WCM效率高于禾本科植物。此外，WCM对飞落在土壤表面的杂草种子出苗也有强烈的抑制作用。WCM与可降解地膜的组合、处理对多年生植物的出苗有较好的抑制作用。WCM对酸性污染物空气的吸收能力表现为NOx和SOx.6。本研究认为，从污泥中提取水分可作为净水厂废水资源化的重要途径之一。较少

The sludge issued from water purification process in water filtration plant has been classified as industrial waste and generally disposed into hollow as the material for reclamation by filling up. However, the sludge is mainly compsed of mineral soil materials as clay and organic matters as microoganisms which were floated in river water. Looking at sludge from a different angle, it can regurd as useful soil resource.From the viewpoint of recycle, some part of the sludge have been tried to use as a marerial of bed soil for plant seedings.This study was conducted to make and utilize the weed control material with the capacity absorbing acid pollutant air from the sludge. The results obtained were as follows.1. Weed control material (WCM) was manifuctured by pelleting wet sludge to 3mm in diameter, and dried up. The WCM gained low wettability and high water premeability. When the soil surface was covered with the WCM,the upper layr of the WCM was maintained to dry for long period becaus … More e of low wettability and high water permeability. Such characteristics were considered to be effective as the WCM.2. The depressing capacity of WCM to the emergence of weed from soil was largely enhanced by mixing of plant power having allelopathic activities with the sludge in the manifucturing process of the WCM,and the power of coffee residue, hask and morishima-accasia leaves was found to be useful plant materials.3. The efficiency of the WCM was higher for non-graminous plants than for graminous ones. Beside, the WCM was also strongly inhibited the emergence from weed seed flied onto soil surface.4. The emergence of perennial plants was sufficiently restricted by the combination, treatment of the WCM and decomposable plastic film.5. The WCM showed the capacity to absorb the acid pollutant air as NO_x and SO_x.6. From this study, the manifucture of WCM from the sludge was considered to be one of the important ulilization method for recycle of water waste issued from water purification plant. Less