What is gray water:
Domestic sewage mainly refers to the sewage generated by residents' living activities, mainly including toilet flushing, washing, bathing and kitchen drainage. Gray water is a kind of domestic sewage, which refers to domestic sewage other than toilet sewage (also known as "black water"). Gray water specifically includes bathing sewage, washing sewage, washing sewage and kitchen sewage generated in daily life. Domestic sewage mainly refers to the sewage generated by residents' living activities, mainly including toilet flushing, washing, bathing and kitchen drainage. Gray water is a kind of domestic sewage, which refers to domestic sewage other than toilet sewage (also known as "black water"). Gray water specifically includes bathing sewage, washing sewage, washing sewage and kitchen sewage generated in daily life.
Features of gray water:
The total amount of gray water is relatively large. Gray water accounts for about 70% of the total amount of domestic sewage and is the main component of domestic sewage.
Gray water is easy to handle. Basically no feces. Low concentration of pollutants and less pathogenic bacteria
bacteria. Gray water has 90% less nitrogen than black water. The nitrogen content is low, so there are less water treatment requirements. Compared with centralized toilet sewage, gray water is more suitable for resource utilization after collection and treatment, and the treatment technology is less difficult.
Gray water is more likely to form an ecological cycle system for sewage treatment. The treated gray water can be used for flushing toilets, irrigating plants, supplementing surface water, etc. Plants can also absorb nutrients in gray water, thus forming an ecological cycle system.
How to better deal with gray water:
Domestic sewage treatment is to remove and degrade harmful substances and environmental pollutants in domestic sewage for harmless treatment. As gray water that is easier to recycle, the "collection, treatment and reuse mode" is suitable for its treatment. The collection, treatment and reuse of gray water can not only reduce the water load of the sewage collection and treatment system, but also reduce the consumption of water resources.
Common reuse methods include agricultural irrigation, outdoor flushing, landscape water, and indoor flushing.