How can textile wastewater treatment be made low-energy and low-carbon?
Stakeholders : EHS professionals , Energy management professionals , Machinery and equipment makers , Textile industry sustainability professionals , Textile waste management professionals ,
Textile effluent treatments need elaborate stages and processes in order to ensure that the resulting water post treatment meets strict pollution control norms. As a result, significant amounts of energy are utilized in many stages of the textile industry wastewater treatment.
Finding out sustainable and more efficient solutions for these energy applications can save significant amounts of greenhouse emissions, as well as money!
Presented in this paper is a low-carbon assessment for wastewater treatment by a constructed wetland as ecological engineering. Systems accounting by combining process and input–output analyses is applied to track both direct and indirect GHG emissions associated with the wastewater treatment. Based on the detailed assessment procedures and the embodied GHG emission intensity database for the Chinese economy in 2007, the GHG emissions embodied in both the construction and operation stages of a pilot constructed wetland in Beijing are investigated in detail, with parallel calculations carried out for a cyclic activated sludge plant as a typical conventional wastewater treatment system for comparison.
With the overall embodied GHG emissions taken into account, the constructed wetland is shown to be remarkably less carbon intensive than the conventional wastewater treatment system, and the contrast in GHG emission structure is also revealed and characterized. According to the results, the ecological engineering of the constructed wetland is considered to be favorable for achieving the low-carbon goal.
This work involved the treatment of industrial wastewater from a nylon carpet printing plant which currently receives no treatment and is discharged to sea. As nylon is particularly difficult to dye, acid dyes are required for successful coloration and cause major problems with the plant's effluent disposal in terms of color removal. Granular activated carbon Filtrasorb 400 was used to treat a ternary solution of acid dyes and the process plant effluent containing the dyes in a fixed-bed column system.
One of the textile industries in Penang, Malaysia is experiencing high concentration of COD and colour in the final effluent after biological treatment exceeding the standard discharge limit. The purpose of the present study was to investigate the suitability of using activated carbon (AC), limestone (LS) and mixture of both (LS:AC) as low cost media for the post-treatment of treated effluent. The physico-chemical treatment adopted in this study is preferred over the other methods because of its simplicity, easy maintenance and quality control. The result showed that limestone and activated carbon mixture provides an alternative medium for removing COD and colour at a much lower cost as compared with activated carbon.
US-based SeaChange Technologies has put a new spin on the clean-up of textile effluent from dyeing and finishing with a new way to treat wastewater and sludge using vortex separation in a one-step process.Funded by Fashion for Good, the North Carolina start-up has recently completed a 3- month pilot-scale trial with Indian textile giant Arvind using its patented cyclonic separation technique to clean wastewater streams and highly concentrated sludge to reduce both chemical discharge and overall greenhouse gas emissions in the dyeing process.