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The Root‐Zone Process at Holtby Sewage‐Treatment Works
Author(s) -
CHALK E.,
WHEALE G.
Publication year - 1989
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.1989.tb01509.x
Subject(s) - phragmites , dns root zone , environmental science , environmental engineering , sewage treatment , ecology , soil science , soil water , wetland , biology
THE ‘root‐zone’ sewage‐treatment proccess was introduced to the UK and Yorkshire Water in 1984, with claims that capital and operating costs were significantly less than for conventional processes. The design and construction of the experimental root‐zone bed at Holtby (which forms part of Yorkshire Water's contribution to the evaluation of the process in the UK), is described. The planting of the Phragmites , their growth and the performance of the bed are discussed. Suspended solids and BOD removal efficiencies have satisfied the predictions of the designers for the performance of a bed which is still immature, although ammonia and phosphate removals have been low. The role which is played by the reeds is considered to be minor, and it is suggested that it is too early to judge the Holtby bed either a success or a failure. The paper also discusses the problem of weed control, the importance of floor slope, maturity of the system and the use of gravel instead of soil.