tailieunhanh - STREAM ECOLOGY & SELF-PURIFICATION

The environmental challenges we face today include all of the same ones that we faced more than 30 years ago at the first Earth Day celebration in 1970. In spite of the unflagging efforts of environmental professionals (and others), environmental problems remain. Many large metropolitan areas continue to be plagued by smog, beaches are periodically polluted by oil spills, and many running waters (rivers and streams) still suffer the effects of poorly treated sewage and industrial discharges | STREAM ECOLOGY SELF-PURIFICATION Copyright 2001 by Technomic Publishing Company Inc. HOW TO ORDER THIS BOOK BY PHONE 800-233-9936 or 717-291-5609 8am-5pm Eastern Time BY FAX 717-295-4538 BY MAIL Order Department Technomic Publishing Company Inc. 851 New Holland Avenue Box 3535 Lancaster PA 17604 . BY CREDIT CARD American Express VISA MasterCard BYWWWSITE http PERMISSION TO PHOTOCOPY POLICY STATEMENT Authorization to photocopy items for internal or personal use or the internal or personal use of specific clients is granted by Technomic Publishing Co. Inc. provided that the base fee of US per copy plus US .25 per page is paid directly to Copyright Clearance Center. 222 Rosewood Drive Danvers MA 01923 USA. For those organizations that have been granted a photocopy license by ccc a separate system of payment has been arranged. The fee code for users of the Transactional Reporting Service is 1-58716 01 .25. Copyright 2001 by Technomic Publishing Company Inc. 2ND EDITION Stream Ecology Self-Purification An Introduction FRANK R. SPELLMAN . Environmental Health and Safety Manager Hampton Roads Sanitation District Virginia Beach VA JOANNE Technical Writer Wastewater Treatment Plant Operations TECHNQMIC PUBLISHING co. T ẠNCASTER-BASET Copyright 2001 by Technomic Publishing Company .