BS-EN-12255-5-1999.pdf
《BS-EN-12255-5-1999.pdf》由会员分享,可在线阅读,更多相关《BS-EN-12255-5-1999.pdf(12页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 12255-5:1999 Incorporating Corrigendum No.1 Wastewater treatment plants Part 5: Lagooning processes The European Standard EN 12255-5:1999 has the status of a British Standard ICS 13.060.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:49 GMT+00:00 2006, Uncont
2、rolled Copy, (c) BSI BS EN 12255-5:1999 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 15 December 1999 BSI 27 July 2004 ISBN 0 580 35056 8 National foreword This British Standard is the official English language version of EN 12255-5:1999.
3、 The UK participation in its preparation was entrusted by Technical Committee B/505, Wastewater engineering, to Subcommittee B/505/40, Wastewater treatment plants, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. T
4、his standard is published with a national annex, which provides further information for the UK user on polishing ponds. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entit
5、led “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance
6、 with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related inte
7、rnational and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendme
8、nts issued since publication Amd. No. DateComments 15266 Corrigendum No.1 27 July 2004Addition of national annex Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:45:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI (8523($1?67$1$5 1250(?(8523e(11( (8523b,6 has a warm temperature and generates d
9、ensity gradients within the lagoon. NA.2 Polishing ponds Table NA.1 Typical surface loading rates for polishing ponds Treatment required Type of process Number of lagoons Surface loading ratea Retention time m3/m2h d Clarification Low rate 2 or more in series 0.02 to 0.03 2b Phosphate removal Low ra
10、te 2 in series 0.004 to 0.006 10c a Based on typical depth of 1 to 1.5 m. b To minimize algal growth which increase effluent suspended solids. c To promote algal growth which assimilates phosphate and must be subsequently removed. National bibliography Standards publications BS 6297, Code of practic
11、e for design and installation of small sewage and treatment works and cesspools. Other publications 1 The Chartered Institution of Water and Environmental Management. Handbook of UK Wastewater Practice, Tertiary Treatment (second edition). CIWEM: 1994. Page 9 BS EN 122555:1999 Licensed Copy: sheffie
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS EN 12255 1999
链接地址:https://www.31doc.com/p-3736971.html