Skip to main content

Design of a Chemically Enhanced Wastewater Treatment Lagoon in Brazil

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

This study describes he design of an upgrade for an overloaded wastewater treatment facility in the state of S˜o Paulo, Brazil. The current facility serves 50,000 people and consists of an anaerobic lagoon followed by a facultative lagoon that only removes 42% of the chemical oxygen demand. The design proposed by Sabesp, the state environmental agency, will replace the existing lagoons with mechanically aerated basins followed by settling basins.

The authors were given permission to visit the current lagoons and to offer alternate design(s). We recommend chemically enhanced primary treatment (CEPT) as the central feature of the alternate design. CEPT is the process whereby metal salts are added to the wastewater to enhance the removal of solids, organics, and phosphorus via coagulation and flocculation. Two design alternatives are presented and compared, on the basis of performance and cost, with the proposed Sabesp design. The first involves the construction of a small CEPT tank ahead of the lagoons. The second is the addition of the chemical coagulants directly to the inlet of the first lagoon. Jar-tests conducted at the site show that both design alternatives have comparable removal efficiencies with respect to the proposed Sabesp design, while significantly reducing both capital and operations and maintenance costs.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864700784547070

Publication date: January 1, 2000

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites
wef/wefproc/2000/00002000/00000007/art00046
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more