Spellman, Frank R., <br/><br/>
Mathematics manual for water and wastewater treatment plant operators / 
Frank R.Spellman. 
 - Second edition. 
 - 3 volumes :  illustrations ;  24 cm. 
<br/><br/>Includes index. 
<br/><br/> Basic mathematics for water and wastewater operators -  Water treatment operations : math concepts and calculations -  Wastewater treatment operations : math concepts and calculations.  volume 1.  volume 2.  volume 3. 
<br/><br/><label>ISBN: </label>9781482224740  RM761.70 9781482224214 9781482224252 9781482224283 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Purification--Mathematics.<br/>Water quality management--Mathematics.<br/>Water--Purification--Problems, exercises, etc.