Abstract
The present chapter focuses on the use of the coagulation process for the treatment of greywater. The performance of the most frequently used chemical and natural coagulants are presented, along with the factors affecting their performance. A comparison of different coagulants in removing different contaminants from greywater is given. The effect of the combined use of chemical and natural coagulants is also discussed. Treated greywater quality is compared with different reuse guidelines to identify the suitability of coagulated greywater for different reuse purposes, and accordingly, some pretreatments and posttreatments to the coagulation process are recommended to meet those guidelines. It is found that the combined use of chemical and natural coagulants for the treatment of source-separated greywater reduces sludge generation and improves the treatment efficiency. Also, based on the source of greywater, pretreatments, such as sedimentation or coarse filtration as posttreatment, would be necessary to meet the different reuse guidelines, as coagulation alone cannot meet them.
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