The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1989
Filed:
Jun. 23, 1988
Johannes P Maree, Pretoria, ZA;
Council for Scientific and Industrial Research, Pretoria, ZA;
Abstract
The invention provides a process for the treatment of water containing dissolved calcium ions and dissolved sulphate ions. The water is passed at a pH of 5-8,5 through an anaerobic biological sulphate removal stage wherein microorganisms utilize sulphate ions in the water to produce hydrogen sulphide. The water from the sulphate removal stage is then passed through a hydrogen sulphide removal stage where hydrogen sulphide is removed therefrom. Water form the hydrogen sulphide removal stage is passed through an aerobic biological treatment stage wherein microorganisms cause at least partial biodegradation of any organic material remaining in the water and wherein calcium carbonate is precipitated. The invention also provides a biological water treatment installation which comprises an enclosed reservoir means which provides an anaerobic stage and which feeds into a hydrogen sulphide removal stge, which feeds into a reservoir means having oxygenating means therein for oxygenating water therein and providing an aerobic stage.