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3.1 Domestic Wastewater
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3.1 Domestic Wastewater

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Domestic wastewater is the used water in households or communities for daily lives, which is generated from toilet flushing, food preparation, laundry, shower, house cleaning etc. It is classified into two categories, black water and grey water. The black water contains harmful bacteria and disease-causing pathogens and poses health risks to human beings.

 

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The volume of domestic wastewater generated in rural areas accounts for 60%-90% of domestic water consumption (GB/T 37071-2018). Generally, the domestic water consumption varies depending on local economic conditions, water supply levels, and living habits. The average water consumption is the lowest in northwest China, where climate is arid with limited water resources and freezing winter, compared to that in other regions. In pace with the rural vitalization activities since 2018, living conditions in many villages have been improved significantly, with sustainable water supply access and inhouse plumbing fixtures installed. Normally, the domestic water consumption ranges from 30 to 200 liters per capita per day in rural areas in China as shown in Table 3.1. Exact water consumption data for a specific village should be obtained through detailed investigation. The referenced discharge coefficients in different areas and seasons are listed in Table 3.2. Typical characteristics of rural wastewater is shown in Table 3.3 and should be determined on the basis of actual monitoring.

 

Wastewater from agricultural activities and livestock raising generally has higher concentration of COD, nitrogen and phosphorus than that in domestic wastewater. For large scale of livestock farms, the daily amount of wastewater is significantly high. Considering the difference in water quality characteristics and amount, the domestic wastewater should be managed separately from wastewater from agricultural and livestock raising activities.

 

Table 3.1 Reference values of daily domestic water consumption in rural areas in China

(villages with municipal water supply)

 

Type of villages

Domestic Water Consumption

(L per capita per day)

Northeast

Northwest

Southwest

North China

Southeast

South and Central China

With flush toilets, and shower facilities

80-135

75-140

80-160

100-145

120-200

100-180

With flush toilets and without shower facilities

40-90

50-90

60-120

40-80

90-130

60-120

Without flush toilets and shower facilities

40-70

30-60

40-80

30-50

80-100

50-80

Source: Guide Rule of Rural Domestic Sewage Treatment (GB/T 37071-2018).

 

Table 3.2 Reference values of the discharge coefficient* of domestic wastewater in rural areas in China

Region

Northeast

Northwest

Southwest

North China

Southeast

South and Central China

Wastewater discharge coefficient (all wastewater collected)

0.7-0.9

0.7-0.9

0.6-0.9

0.8

0.7-0.9

0.6-0.8

*: the proportion of domestic wastewater to water consumption

Source: Guide Rule of Rural Domestic Sewage Treatment (GB/T 37071-2018).

 

Table 3.3 Reference values of raw domestic wastewater quality in rural areas in China 

Parameter

COD

BOD5

NH3-N

TN

TP

SS

pH

Reference value

150-400

100-200

20-40

20-50

2-7

100-200

6.5-8.5

Source: Technical standards for domestic wastewater treatment engineering of rural area (GBT51347-2019).

 

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