Treatment of domestic washing wastewater

Washing waste water is a mixed waste water composed of toilet water, bath water, washing water, kitchen rinse water and a small amount of miscellaneous drainage, which is the collection of all waste water except toilet waste water, kitchen dish waste liquid and kitchen waste crushing mixed liquid.
This paper gives a brief introduction from the perspective of emissions and treatment methods.

Common washing wastewater discharge and treatment methods are as follows:
It can be collected and treated together with the waste water of feces and urine, separately collected, treated and reused, and directly discharged.

Combined with waste water from manure and urine collection and treatment

In areas with perfect drainage facilities, washing wastewater is usually collected together with fecal and urine water and kitchen high concentration wastewater and then discharged to sewage treatment facilities, including treatment plant, treatment station and household integrated treatment equipment, etc., and discharged after treatment.

Due to the high cost of infrastructure construction and operation, the scope of application is mainly urban and surrounding areas, as well as rural communities in developed countries and regions.

Separate collection processing reuse

The washing waste water is collected and transported to the special treatment facilities through independent pipes, and is used for flushing toilets, lawn watering or farmland irrigation after proper treatment.

Because the washing waste water is not mixed with feces and urine, the pollution degree of the washing waste water is relatively light, and the acceptance degree of residents’ reuse is relatively high.

At the same time, the treatment and reuse of washing wastewater is of positive significance to solve the global shortage of fresh water and reduce the load of water supply and drainage facilities.

Separate collection, processing and recycling methods usually have different forms in different countries and regions with different levels of economic development.
In developed countries and regions, high standard treatment processes are generally used, with complete disinfection, storage and reuse facilities, while in low-income countries and regions, collection and treatment facilities are relatively simple, or even directly reused without treatment.

Direct discharge

Direct emission is the lowest cost emission mode, which not only widely exists in low-income countries, but also in some regions of developed countries such as Europe and America.

Direct discharge without treatment usually causes environmental pollution, but there is also evidence that direct discharge of ash water will not have a great negative impact in areas with suitable geographical and climatic conditions and sufficient self purification capacity.

[wedge wire screen filter for Treatment of domestic washing wastewater ]