Construction of Roadway, Sanitary Latrine Ring and Septic Tank Using Textile Sludge

摘要

Textile effluent, after treatment produces sludge, contains high concentrations of organic and inorganic chemicals and characterized by high pH, Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), Total Dissolved Solids (TDS), Total Suspended Solids (TSS), low Dissolved Oxygen (DO) and strong color. Now it is a burning question, how this sludge will be properly managed? There are different options for sludge management such as, wetland filling, brick preparation, incineration, composting and biogas generation. Biogas generation by anaerobic digestion is sustainable, cost effective and eco-friendly method in Bangladesh. We have analyzed both the raw and residual sludge at BCSIR, Dhaka, to check the pollution reduction level after biogas generation from Textile sludge. We found that 55-96% pollution was reduced in various parameters. The residual sludge generated after biogas generation should be managed properly utilizing eco-friendly and sustainable technique (s). This paper describes some eco-friendly and sustainable methods of residual sludge management. In this work, we have constructed lab-scale pavement by using both the raw and residual sludge as substituent of sand in sub-grade. Sludge can be co-processed with cement. We have constructed lab-scale blocks by co-processing of sludge with cement at different proportions. Sanitary latrine ring and septic tanks can be constructed with co-processed sludge in cement in upcoming project. Utilization of both the residual and raw sludge after biogas generation in roadway construction was determined to be a viable, eco-friendly and sustainable solution regarding sludge disposal problem.