Liquid purification or separation – Processes – Treatment by living organism
Patent
1994-12-12
1996-05-21
Hruskoci, Peter A.
Liquid purification or separation
Processes
Treatment by living organism
210622, 210623, 210629, 210630, 210151, 210188, 2101953, 210202, 210218, 210256, 210258, C02F 322, C02F 330
Patent
active
055186181
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention addresses the field of waste water purification. More particularly, the invention relates to a system for purifying waste water, which comprises at least two reactor chambers separated by a vertical wall, a liquid supply and a liquid discharge, wherein nitrogenous waste water is nitrified and denitrified, and to a process for purifying nitrogenous waste water, the water being treated with microorganisms alternately in an oxygen-depleted chamber and an oxygen-rich chamber and then being separated from the microorganisms.
BACKGROUND OF THE INVENTION
EP-A-233466 discloses a system and a process for the biological purification of waste water, wherein BOD decomposition, nitrification and denitrification are carried out simultaneously in a reactor in which there are microorganisms attached to a carrier. The carrier type is such that the biomass can move freely through the waste water. The purified water and the sludge are then separated in a secondary settling tank, whereafter the sludge is returned to the reactor.
EP-A-24758 discloses a process and a system for oxidative biological purification of waste water, the waste water being passed upwards through an oxidation chamber in which there are microorganisms attached to an insoluble carrier. Separation of the purified waste water and the active sludge takes place at the top of the oxidation chamber, all of the sludge being returned to the oxidation chamber. In this case, both COD purification and nitrification take place.
EP-A-28846 discloses a process for preparing biomass attached to a carrier, the carrier, for example sand, being brought into contact, while being aerated using a sufficient amount of mechanical energy, with a liquid which contains the required microorganisms and nutrients.
A process and an apparatus for aerobic treatment of waste water are known from EP-A-268225. The apparatus is divided in two reaction chambers, one being gas-rich and the other being gas-depleted, and is provided with a settling chamber.
EP-A-399380 discloses an apparatus suitable for denitrification and nitrification of waste water comprising a reactor having an internal vertical division allowing a circulation of the waste water with filling material carrying the biomass. A denitrifying zone is provided in the funnel-shaped bottom part of the reactor.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an improved system and an improved process for biological purification of nitrogenous waste water, in which the nitrogenous components are, as far as possible, nitrified and subsequently denitrified, i.e. converted to nitrogen gas, and by means of which a greater efficiency is achieved than with the conventional systems and processes, while the sludge is separated from the purified waste water continuously and completely and is recirculated.
BRIEF DESCRIPTION OF THE DRAWINGS
The process and the system according to the invention are illustrated in more detail with reference to the accompanying figures, wherein
FIG. 1 depicts a system according to the invention.
FIG. 2 depicts an alternative system according to the present invention.
FIG. 3 is an exploded view of the adjustable valve depicted in FIG. 2.
DETAILED DESCRIPTION OF THE INVENTION
The system (apparatus) according to the invention comprises at least two reactor chambers (1) and (2) which are essentially separated by a vertical wall (3), a liquid supply (4) and a liquid discharge (5), the first reactor chamber (1) being provided at the top with an overflow (6) to the second reactor chamber (2), the second reactor chamber (2) being divided at the top into a degassing chamber (7) and a settling chamber (8), which settling chamber is provided with an overflow (9) to the liquid discharge (5), the second reactor chamber (2) being provided at the bottom with one or more passages (10) for recycling liquid from the second reactor chamber (2) to the first reactor chamber (1), and the first reactor chamber (1) being provided with a gas supply (11) and/or (1
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Mulder Ronald
Vellinga Sjoerd H. J.
Green Theodore M.
Hruskoci Peter A.
Paques B.V.
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