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

水过滤厂净水过程中产生的污泥被归类为工业废弃物，一般填埋成空心作为回收材料。而污泥主要由粘土等矿质土壤物质和漂浮在河水中的微生物等有机质组成。从另一个角度来看，污泥是一种有用的土壤资源。从循环利用的角度出发，尝试将部分污泥作为植物苗木的基土材料。为研制和利用具有吸收污泥中酸性污染空气能力的除草材料进行了研究。所得结果如下：1。将湿污泥制粒至直径3mm，干燥后制备除杂草材料。WCM具有低润湿性和高水渗透性。当土壤表面覆盖WCM时，由于WCM的低润湿性和高透水性，使WCM上层长期保持干燥状态。这些特征被认为是有效的WCM.2。在WCM的制备过程中，将具有化感作用的植物粉与污泥混合，可大大增强WCM对土壤中杂草的抑制能力，其中咖啡渣、茶渣和森岛附着物叶的抑制能力较好。非禾本科植物的WCM效率高于禾本科植物。此外，WCM对飞入土壤表面的杂草种子的羽化也有较强的抑制作用。WCM与可分解地膜的组合处理对多年生植物的出苗有充分的抑制作用。WCM对酸性污染物NO_x和so_x具有较强的吸附能力。本研究认为从污泥中提取WCM是净水厂废水循环利用的重要方法之一。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