This liquid requires further treatment as it is high in nitrogen and phosphorus, particularly if the sludge has been anaerobically digested. The treatment can take place in the sewage treatment plant itself (by recycling the liquid to the start of the treatment process) or as a separate process.
verb (used with object), abrogated, abrogating. 1. to abolish by formal or official means; annul by an authoritative act; repeal: to abrogate a law. 2. to put aside; put an end to. Origin of abrogate. Latin.
According to the WebsterÃ½s Unabridged Dictionary, a surrogate is an âartificial or synthetic product that is used as a substitute for a natural product.â ThatÃ½s a great definition for the surrogate keys we use in data warehouses. surrogate key is an artificial or synthetic key that is used as a substitute for a natural key. Actually, a surrogate key in a data warehouse is more than just a substitute for a natural key.