河道底泥制砖生命周期评价研究

Study on Life Cycle Assessment of River Bottom Mud Brick Production

河道底泥是水生态系统中物质交换和能流循环的中枢。由于大量的污(废)水排入水体,并携带污染物和营养物聚集在底泥中,所以已成为黑臭水体整治工程中内源治理的重点。底泥经水热固化处理后,形成相关材料在满足技术指标要求的基础上,可取代混凝土制品。建立河道底泥制砖全流程环节数据清单,选取7项关键环境影响指标,采用eBalance软件进行生命周期评价,并与黏土实心标准砖、混凝土标准砖的影响指标进行对比分析。结果表明:河道淤泥标准砖生命周期过程中,对各环境影响指标均有较大贡献的是配料搅拌过程的生石灰消耗,电力消耗对各环境影响指标均有一定影响;底泥制砖除RI指标外,其他指标均低于两类标准砖,具有降低环境影响的优势。

River sediment is the center of material exchange and energy flow circulation in water ecosystem. Because a large amount of sewage(waste) water is discharged into the water body and carries pollutants & nutrients to gather in the bottom mud, it has become the focus of endogenous treatment in the black & odorous water body treatment project. After the bottom mud is treated by hydrothermal curing, the relevant materials can be formed to replace concrete products on the basis of meeting the requirements of technical indicators. Establish the data list of the whole process of making bricks from river bottom mud, select 7 key environmental impact indicators, use e Balance software for life cycle assessment, and compare & analyze the impact indicators with clay solid standard bricks & concrete standard bricks. The results show that during the life cycle of the standard brick of river sludge, the quicklime consumption in the mixing process has a great contribution to the environmental impact indicators, and the power consumption has a certain impact on the environmental impact indicators. Except RI index, other indexes of bottom mud brick are lower than those of two kinds of standard bricks, which has the advantage of reducing environmental impact.