WO1987006572A1 - Ameliorations a une installation de traitement d'eaux usees utilisant un contacteur biologique rotatif - Google Patents

Ameliorations a une installation de traitement d'eaux usees utilisant un contacteur biologique rotatif Download PDF

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Publication number
WO1987006572A1
WO1987006572A1 PCT/GB1987/000271 GB8700271W WO8706572A1 WO 1987006572 A1 WO1987006572 A1 WO 1987006572A1 GB 8700271 W GB8700271 W GB 8700271W WO 8706572 A1 WO8706572 A1 WO 8706572A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
treatment plant
tank
rotor
rolling members
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1987/000271
Other languages
English (en)
Inventor
Michael Ian Robert Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Klargester Environmental Engineering Ltd
Original Assignee
Klargester Environmental Engineering Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Klargester Environmental Engineering Ltd filed Critical Klargester Environmental Engineering Ltd
Publication of WO1987006572A1 publication Critical patent/WO1987006572A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/08—Aerobic processes using moving contact bodies
    • C02F3/082—Rotating biological contactors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • This invention relates to waste-water treatment plant that utilises a rotating biological contactor (or RBC) to provide a large area biomass support surface on which biological break-down of pollutants entrained in waste water can occur.
  • An RBC for a large waste-water treatment plant could be over 5 metres in diameter and over 8 metres in length and when fully loaded with wet biomass could weigh in excess of 60,000 Kg.
  • the support of the shaft of a rotor of this size in a waste-water tank poses problems.
  • the shaft of an RBC is supported from below within the tank of a waste-water 5 treatment plant by at least two rolling members at each end of the shaft, the at least two rolling members at each end defining a cradle into which the shaft end can be lowered to rotatably rest.
  • The-, rolling members could be an arcuate array of 10 balls but preferably cylindrical rollers are used.
  • each cradle there are three axially parallel rollers defining each cradle and suitably the rotating axes of the three rollers and the rotating axis of the shaft define the corners of a quadrilateral which is symmetrical
  • the semi-angle between the said diagonal and each side of the quadrilateral that passes through the shaft axis conveniently lies between 20° and 70° and preferably
  • rollers 20 between 30° and 60°.
  • Four or five rollers can also be used to define each cradle.
  • the cradle of rolling members at each end of the shaft is disposed so that the upper surface of the shaft is at or close to the normal free surface
  • the percentage immer ⁇ sion of the shaft may vary from 65 to 100%, depending upon the process application.
  • the shaft is a closed hollow volume so that the weight of water it displaces exceeds the weight of the shaft and also assists
  • Each cradle of rolling members can be supported from the bottom of the tank or it can be hung in the respective end of the tank from an exposed upper surface of an adjacent tank wall.
  • further rolling members may be provided to ensure axial positioning of the rotor shaft in the tank.
  • the diameters of the rollers making up each cradle are suitably between one half and one tenth of the diameter of the shaft and the length of each roller is suitably between 100 and 300 mm.
  • the shaft can be between 500 and 1500 mm in diameter and the rotor can be submerged to between 65 and 100% of the available area of the biomass support surface.
  • the rotor can be driven by air bubbled into the tank below the rotor (as described in US-A-3886074 ), by one or more of the rolling members making up each cradle being driven, or by a motorised drive member (e.g. a chain, toothed or pegged wheel) engaging the periphery of the rotor or a drive flange attached to the shaft.
  • a motorised drive member e.g. a chain, toothed or pegged wheel
  • Figure 1 is a side elevation of the RBC of a waste- water treatment plant supported in a tank in accordance with the invention in different ways on the left- and right-hand sides, and
  • Figure 2 is a sectional view on the line II-II in Figure 1.
  • An RBC 1 comprises a hollow shaft 2 surrounded, apart from over two end regions 3 and 4, with an annular array 5 of packs of plactics sheeting profiled, to pro ⁇ vide a multitude of channels for water and air flow to the interior of the packs and to provide a total biomass support area in excess of 20,000 square metres.
  • the packs of plastics sheeting can be mounted in radially extending supporting frames in the manner des ⁇ cribed in the speci ication of European Patent Application 85309188.2 filed 17th December 1985.
  • each end 3 or 4 of the shaft 2 is supported in a cradle of rollers 6 freely journalled from a suitable roller support means 7.
  • the support means 7 is a frame 8 resting on the base 9 of a tank 10 containing the RBC 1 and on the left- hand side the support means (here designated 7 1 ) depends from an upper wall 11 of the tank 10.
  • Figure 1 also shows two alternative ways of rotating the RBC 1. Firstly, in the bottom of the tank 10, air nozzles 13 can be located, through which air from a blower 14 issues to be trapped on the ascending side of the rotor and thus generate a turning moment. Secondly, on one end of the shaft 2 a toothed flange 15 is mounted which engages a rotating peg 16 driven by a motor 17. " Clearly other drive mechanisms can be evolved.
  • Figure 2 shows, in dotted lines, two . additional rollers 6 1 which make a cradle of five rollers in all. This may be desirable with the heaviest rotors.
  • one or more of the rollers at each end can be flanged * so that the end of the shaft bears against the roller flange(s).
  • a further roller can be provided (e.g. with its axis vertical) at each end to bear against the respective end of the shaft.
  • the invention appears to be particularly applicable to rotors with diameters between two and six metres and axial lengths of up to eight and a half metres.
  • one or more cradles can be pro ⁇ vided to rest on the bottom of the tank between adjacent arrays 5, the upper edge of each cradle having a surface which does not contact the shaft 2 under normal loading conditions of the latter.
  • An alternative to a cradle supporting from below would be a chain or hawser looped below the shaft at one or more points between the end rollers.
  • lifting lugs at each end and at least one similar lug uniformly spaced-apart between the end lugs.
  • the lifting lugs can then be engaged by lifting bars or cables depending from a spreader bar when lifting of the RBC is required.
  • a treatment plant according to this invention can be used for sewage treatment and also for carbonaceous BOD removal, nitrification and denitrification appli ⁇ cations.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Fertilizers (AREA)

Abstract

L'installation de traitement d'eaux usées comprend un rotor de contacteur biologique (1) ayant un arbre (2) monté de manière rotative dans un réservoir (10) d'eaux usées. L'arbre du rotor est supporté à chaque extrémité par-dessous à l'aide d'un berceau d'organes roulants (6) dans lequel les extrémités de l'arbre sont abaissées. Le rotor peut être mis en rotation à l'aide d'un moteur (17) ou pneumatiquement par de l'air provenant d'une soufflante (14).
PCT/GB1987/000271 1986-04-25 1987-04-24 Ameliorations a une installation de traitement d'eaux usees utilisant un contacteur biologique rotatif Ceased WO1987006572A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8610142A GB8610142D0 (en) 1986-04-25 1986-04-25 Rbc waste-water treatment plant
GB8610142 1986-04-25

Publications (1)

Publication Number Publication Date
WO1987006572A1 true WO1987006572A1 (fr) 1987-11-05

Family

ID=10596829

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1987/000271 Ceased WO1987006572A1 (fr) 1986-04-25 1987-04-24 Ameliorations a une installation de traitement d'eaux usees utilisant un contacteur biologique rotatif

Country Status (2)

Country Link
GB (2) GB8610142D0 (fr)
WO (1) WO1987006572A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886074A (en) * 1973-06-15 1975-05-27 Autotrol Corp Air driven rotating biological contactor apparatus
US4256580A (en) * 1976-10-08 1981-03-17 Mecafina S.A. Waste water purifying plant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886074A (en) * 1973-06-15 1975-05-27 Autotrol Corp Air driven rotating biological contactor apparatus
US4256580A (en) * 1976-10-08 1981-03-17 Mecafina S.A. Waste water purifying plant

Also Published As

Publication number Publication date
GB8725301D0 (en) 1987-12-02
GB2199574B (en) 1989-11-29
GB8610142D0 (en) 1986-05-29
GB2199574A (en) 1988-07-13

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