Wastewater Engineering: Collection, Treatment, Disposal

[for civil/mechanical engineers] This is the classic Metcalf and Eddy wastewater design text. It was superceded by a 'second' edition by Dr.G. Tchobanoglous (chew-ban-oh-gloss) that split the text into two volumes, one on sewage collection, and the other on treatment and re-use. There is now an even newer 'second' edition of the treatment volume, but the 'first' edition of the collection volume remains current. Note that this classic contains design information on older technologies (e.g. Imhoff tanks) that was omitted in the later additions, but are still quite useful to have for designing systems in less developed situations. My dad gave away his copy and I have missed it ever since.