摘要:
A waste water treating apparatus includes a circulation type aeration tank having a downward flow chamber and an upward flow chamber extending in the depth direction and communicating with each other at the upper and lower ends thereof. An oxygen containing gas is supplied to the downward flow chamber and waste water and return sludge are supplied to a given position or elevation of the upward flow chamber to be mixed with a mixed liquor flowing through the upward flow chamber, whereby a reduction zone with a low concentration of dissolved oxygen is formed at the upper portion of the upward flow chamber. Denitrification takes place in the above described reduction zone.
摘要:
The invention provides a process for multistep gassing of liquids streaming downward in a gassing apparatus, which comprises using a gassing apparatus consisting of at least two superposed downstream parts, wherein the gas is fed in at the upper end of each downstream part, the gas bubbles are separated at the lower end of each downstream part and the separated gas bubbles are discharged to the outside.The invention provides furthermore a corresponding gassing apparatus.
摘要:
An improved method and apparatus is provided for the treatment of sewage waste in a long vertical shaft bioreactor wherein waste sewage is caused to circulate under air injected oxidizing conditions around a loop comprising adjacent riser and downcomer chambers connected at their upper and lower ends. The improved method comprises the steps of introducing influent waste at depth into the riser chamber at a point higher in the riser than the point of air injection and withdrawing treated effluent from the riser at a point lower in the riser than the point of air injection. A separation chamber may also be operatively connected to the riser chamber to recover sludge for return to the bioreactor. The method provides an improvement in oxygen uptake rate and reduces the anoxic zone in the reactor thus providing additional capacity for BOD.sub.5 removal.
摘要:
In a long vertical shaft bioreactor for the treatment of degradable wastes in a circulating loop, a process is provided for separating and treating the slowly biodegradable components of the waste. The process comprises the steps of aerating and oxidizing the waste liquor in the reactor to produce an effluent and a foam which foam contains the slowly biodegradable components, which have not been degraded in the oxidizing step, separating and collecting the foam, collapsing the foam and subjecting the collapsed foam to further aeration/oxidation treatment to produce a treated effluent. The thus further treated effluent is returned to the bioreactor for reprocessing.
摘要:
This invention provides a method for treating wastewater by circulating wastewater around a system comprising a downcomer and a riser which communicate directly at their lower ends, the level of the wastewater in the downcomer being maintained above the level of the wastewater in the riser to provide a hydrostatic pressure head which causes circulation of the wastewater around the system, supplying a gas containing oxygen to the wastewater as it passes through the downcomer, pumping the wastewater from the top of the riser back into the top of the downcomer and removing treated wastewater from the riser at the same rate as wastewater is introduced into the system characterized in that the height of the hydrostatic pressure head is controlled by adjusting the height at which treated wastewater is removed from the riser and the level of the wastewater in the riser. The invention also provides an apparatus for putting the method into practice.
摘要:
A biological waste water treatment carried out in a single tank. The conditions in the tank are controlled to provide a biological reaction zone containing waste water and biodegrading organisms and an overlying clarification zone from which an effluent of treated waste water flows. The recycle stream is continuously withdrawn from the biological reaction zone, supplemented with influent waste water, passed through an oxygen-dissolving device, and the supplemented stream returned to the reaction zone. The oxygen is monitored and supplied to satisfy the demands of the organisms and, at the same time, to keep the oxygen in solution. The supplemented recycle stream is continuously injected along the bottom of the biological reaction zone in a horizontal shallow inflow having a width substantially greater than its depth and a flow considerably greater than that of the influent. And, the recycle stream is withdrawn from near the bottom of the reaction zone, at a vicinity remote from the inflow, in an outflow having a substantially greater width than its depth. In this way there is created between the inflow and the outflow a horizontally relatively fast flowing undercurrent having an extensive uninterrupted interface with an overlying relatively quiescent body of mixed liquor flowing upwardly relatively slowly.
摘要:
A liquid aeration device includes a head box having a bottom wall, a pair of spaced side walls interconnected with the bottom wall, and a pair of spaced transverse walls interconnected with the side and bottom walls to form a receiver chamber into which liquid to be aerated is fed and from which such liquid passes through orifice means formed in one transverse wall of the head box from whence the liquid by free fall passes through an entry chamber and enters a vertically disposed downcomer conduit interconnected at its bottom with a pressure chamber to which a vertically disposed riser conduit is also connected. A third transverse wall is interconnected with the side walls and spaced downstream somewhat from the transverse wall in which the orifice means is formed and since the head box is of the open top type, an excess of liquid which overflows the transverse wall having the orifice means is allowed to overflow the third transverse wall and to fall by free fall downwardly through the space adjacent the upper end of the riser conduit. If desired a second or more phases may be used and which would include the above described components.
摘要:
Systems and methods for aerobically processing waste, in which an aerobic bioreactor is in selective fluid communication with a source of oxygen-rich liquid medium. The aerobic bioreactor is configured for aerobically processing waste via bacteria fixed on media to provide processed effluent from the waste. The source of oxygen-rich liquid medium is different from the aerobic bioreactor.
摘要:
The present invention concerns un vertical reactor civil and industrial sewage water depuration plant, of the type comprising, in sequence following the flow of water to be depurated: a section (14) of removal of coarse solids which are present in sewage water to be treated, a denitrification basin (18), an oxidation/homogenization basin (20) on the bottom of which a vertical reactor is positioned (22), provided with a plurality of air and oxygen diffusers and with an air lift (23) taking water from the bottom of the vertical reactor (22) and conveying it to a flotation vessel (25) and subsequently to a battery of lamellar packs and from that to a disinfection section (28) and to the outlet, characterised by comprising a second air lift (24) taking water from the vertical reactor (22) at an intermediate height and conveying it to said flotation vessel (25) or to a different flotation vessel (25) and from this to said battery of lamellar packs and subsequently to said disinfection section (28) and to the outlet, means of hydraulic connection by communicating vessels of said denitrification basin (18) and said oxidation/homogenization basin (20), which can be controlled to pass from an open position to a closed position, oxygenation means (48) of said denitrification basin (18) and oxygenation means (46) of said oxidation/homogenization basin (20), stirring means (51) of said denitrification basin (18) and stirring means (49) of said oxidation/homogenization basin (20), and additionally means of detection of oxygen level which is present in said basins (18, 20), controlling the operation of said first deeper air lift (23) and said second less deep air lift (24), and additionally of said oxygenation means (46, 48) and said stirring means (49, 51).
摘要:
Apparatuses for removal of volatile organic compounds in a soil formation include a microporous diffuser for injecting air and gaseous ozone as bubbles into water in the soil formation. The gaseous ozone is present at concentrations to effect removal of volatile organic compounds by the gaseous ozone reacting with the volatile organic compound(s). Injection of air and gaseous ozone is controlled by a timer to allow separation of bubbles by size. In various embodiments, a plurality of microporous diffusers may be controlled by a single timer or each of the plurality of microporous diffusers may be controlled by one of a plurality of timers.