GMJ 9189 Phase 2 Principles of greywater recycling systems

Which is not a category of water?

• Black Water

• Grey Water

• White Water

• Yellow Water

If filtered, greywater can be used for the following applications:

• drinking water

• showering. 

• car washing

• food preparation

Which statement is not correct - Biological systems:

• greywater is oxygenated and infiltrated into reed beds

• added oxygen and bacteria remove organic matter

• after three hours, water passes through UV filter

• some expertise required in maintaining this system.

Which statement is not correct? Biochemical systems :

• greywater chamber no 1 is filtered to remove hair and textiles.  

• chamber for decomposition of organic matter by bio cultures 

• chamber for decomposition of organic matter by bio cultures 

• greywater is oxygenated and infiltrated into reed beds

For short retention systems, which statement is not accurate?

• heavier particles fall to the base of the tank and are flushed away as waste

• skimming removes soap and hair

• the remaining water is transferred to a storage tank

• If the water is not used within about 48 hours then it is purged (discharged to waste).

The basic process of greywater recycling for a physical and chemical system does not include :

• greywater is collected in a cleaning tank

• blackwater is collected in a cleaning tank

• filter removes debris (physical cleaning)

• chemical disinfectants are added (chlorine, etc to inhibit bacterial growth during storage).

Which systems are directly re-used without treatment or storage and are suitable for applications such as watering the garden but not considered suitable for watering fruit and vegetables.   

• Direct re-use

• Black water Siphonic

• short retention

• Biochemical

Which is incorrect? Most greywater systems incorporate the following:

• a tank for storage of treated water

• no pump

• some form of water treatment.

• a distributions system for moving water from the treated water storage to the point of use

Which statement is incorrect? If greywater is correctly filtered and stored then it can be used for:

• flushing toilets

• car washing

• watering a garden

• clothes washing (after no additional processing).

Greywater is classified by the Water Regulations as a fluid category ? risk, which means it can pose a serious risk to health.

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