Gray Water Characteristics and Implications on Regulations for Sustainable Water Reuse

0
- By:

Courtesy of IWA Publishing

Different types of gray water in terms of origin (from bathing, kitchen and laundry activities) and in terms of type of source (medium and low-income residential housing and a hotel) have been studied in Gaborone, Botswana during 2004, with respect to BOD5, TSS, TP, pH, fecal coliforms and conductivity. Results show an expected high variability. No statistically significant difference was found with respect to the different types of sources, however, the low-income houses’ samples showed higher maximum concentrations compared to the medium-income ones, except for pH. The mean values of the laundry gray water from a hotel were significantly higher with respect to pH (~ 9) and conductivity (700 - 9000 µS/cm). Kitchen gray water samples showed a pH lower by 1 unit compared to the bathing and laundry samples from residences (pH = 7.0 - 7.3). TP values showed concentrations 10 - 50mg/l for laundry and kitchen samples. Implications in respect to sustainable types of beneficial reuse and corresponding treatment technology have been discussed. Specific aspects of the regulatory basis for the practical implementation of this practice have been presented with emphasis on the need for the introduction of the decentralized wastewater system approach, parallel to the existing practice of centralized systems.

Continue reading the full article

Customer comments

No comments were found for Gray Water Characteristics and Implications on Regulations for Sustainable Water Reuse. Be the first to comment!