CN1986451A

CN1986451A - Mixed aeration type biological treating system

Info

Publication number: CN1986451A
Application number: CNA2005101116082A
Authority: CN
Inventors: 吴勇
Original assignee: SHANGHAI DAYUAN ENVIRONMENTAL SCIENCE AND TECHNOLOGY ENGINEERING Co Ltd
Current assignee: SHANGHAI DAYUAN ENVIRONMENTAL SCIENCE AND TECHNOLOGY ENGINEERING Co Ltd
Priority date: 2005-12-19
Filing date: 2005-12-19
Publication date: 2007-06-27
Anticipated expiration: 2025-12-19
Also published as: CN100431984C

Abstract

The mixed aeration type biological treating system features that there are one circular biochemical pond set beside the mixing pond, which has one inside ejector and two overflow grooves in the top including one connected to the mixing pond via an outside circulating pipe; one first stage air floating pond connected to the other overflow groove and to the mixing pond via a sewage reflux pipe; one second stage air floating pond connected to the first stage air floating pond; one blower connected to the circular biochemical pond via ventilating pipeline; and one shallow aeration pipe in the outlet of the ventilating pipeline. The present invention has combined inside-pond circulation and outside-pond circulation, greatly raised impact resistance, and increased chemical-adding coagulating and air floating pond for raised treating capacity.

Description

A kind of mixed aeration type biological treating system

Technical field:

The present invention relates to the technical field of water treatment field, specifically a kind of mixed aeration type biological treating system.

Background technology:

In present sewage treatment area, generally more tractable sewage has all obtained comparatively ripe and reliable improvement as resident living sewage, printing and dyeing, oil refining, papermaking, plating, steel wastewater etc., has formed comparatively fixed treatment process and technical process.

Yet,, but lack effective processing means as high concentrated organic wastewater, the waste water etc. that contains some hazardous and noxious substances for some trade effluent.The tradition aerobic biological treatment process but because of exempting from the impact of lotus through the high density of daring not accept, and can't directly adopt.Thereby, the processing of these waste water is just become now comparatively stubborn problem.

Summary of the invention:

The object of the present invention is to provide a kind of improved mixed aeration type biological treating system, it can overcome the some shortcomings that trade effluent in the prior art lacks rational processing means.

To achieve these goals, technical scheme of the present invention is: a kind of mixed aeration type biological treating system, it mainly comprises gas blower, the ejector that links to each other with gas blower, the mixing pit that is connected by pipeline with ejector, and the waste pipe that links to each other with mixing pit, it is characterized in that: the next door of mixing pit is provided with a circulation biochemistry pool, ejector is arranged in the circulation biochemistry pool, the top of circulation biochemistry pool is provided with two and overflows groove, one of them overflows groove and is connected by a pond outer circulating tube with mixing pit, another overflows groove and links to each other with the one-level air flotation pool by pipeline, the one-level air flotation pool links to each other with mixing pit by a mud return line, the one-level air flotation pool is connected with the secondary air-floatation pond again, gas blower links to each other with the circulation biochemistry pool by ventilator trunk, and is provided with the Inka aeration pipe in the ventilator trunk exit.

Mixed aeration type biological treating system of the present invention has following advantage during use:

(1) adopt pond internal recycle and pond outer circulation to combine.The pond internal recycle makes water body be in complete admixture rapidly, and loads all kinds of in the pond is even, and the pond outer circulation can make the high concentration sludge after waste water, cyclic water outlet and the separation mix rapidly, dilute and adsorb, and improves the impact resistance of treatment system greatly;

(2) outer circulation amount in pond can be adjusted according to different waste water qualities.Can be with the method that increases quantity of reflux to high density and the high waste water of poisoning, it loops back flow can be equivalent to tens of times of wastewater flow rate, to prevent that microorganism poisons or aerobic bacteria is restrained.

(3) focus and the working conditions of ejector have been changed.Utilize the ejector gas of carrying under one's arms, must produce negative pressure at narrow trunnion place, could suck air, capacity usage ratio is not high.When but current spray from nozzle, cause gas, the violent mixing of liquid two-phase and mass transfer, and cutting, pulverizing, the adsorption surface expansion that zoogloea caused is had good effect.For this reason, do not consider to utilize injector to hold gas under the arm, use the fan with low voltage air feed instead, water pump is also used low pressure instead, and injector becomes a static mixer in fact.

(4) increase the Inka aeration device.When using ejector separately, after the energy of downward injection reduced, the unable telescopic upper end that rises to of current only formed little circulation in sleeve.In order to change this phenomenon, in the telescopic middle part aerating apparatus is set, water, the air-flow deficiency of makeup water stream raising force just in time upwards that aeration produced makes in the pond systemic circulation improve and strengthens.

(5) native system does not emphasize to adopt round pond, does not pursue excessive aspect ratio (pond dark/pond diameter) yet but adopts semi-underground structure, has both saved initial cost, helps operating maintenance again.

(6) replace settling tank as the solid, liquid separation means with air flotation pool.The proportion of biological sludge discharges and approaches water, adds cutting, the crushing effect of UEJE, and zoogloea contains a lot of bubbles, and it is precipitated, and gets half the result with twice the effort really.As adopt air supporting, and then make the best use of the situation, come-up has played good separating effect easily, the effect that the solid, liquid disengaging time is short, the scum silica frost water ratio that air supporting produces is low than settling tank, so the scum silica frost backflow is easy to.In addition, the regenerative process of mud has been kept in the continuous oxygen supply of bubble that dissolved air water discharges, so mud is active high, is not easy to be in aging and anaerobic state.

(7) set up the dosing coagulation floatation.In some cases, can not the COD value of discharge water be exceeded standard by biodegradable objectionable impurities in the sewage, just can adopt dosing, coagulation, pneumatically supported means to remove COD, P contained compound and SS, guarantee that draining is up to standard and limpid.

Description of drawings:

Fig. 1 is the structural representation of one embodiment of the invention

Embodiment:

The invention will be further described below in conjunction with drawings and Examples.

The present invention mainly comprises gas blower 7, the ejector 6 that links to each other with gas blower, the mixing pit 4 that is connected by pipeline with ejector, and the waste pipe 1 that links to each other with mixing pit, it is characterized in that: the next door of mixing pit is provided with a circulation biochemistry pool, ejector is arranged on circulation biochemistry pool interior 10, the top of circulation biochemistry pool is provided with two and overflows groove, one of them overflows groove and is connected by a pond outer circulating tube 2 with mixing pit, another overflows groove and links to each other with one-level air flotation pool 12 by pipeline, the one-level air flotation pool links to each other with mixing pit by a mud return line 3, the one-level air flotation pool is connected with secondary air-floatation pond 16 again, gas blower links to each other with the circulation biochemistry pool by ventilator trunk, and is provided with Inka aeration pipe 9 in the ventilator trunk exit.Be provided with a sleeve 8 in the circulation biochemistry pool, ejector is arranged in the sleeve, and the pipeline that ejector links to each other with mixing pit is provided with recycle pump 5.

The top of one-level air flotation pool is provided with two ash pits 14, and one of them ash pit links to each other with mud return line, and another ash pit is connected with the secondary air-floatation pond.Be equipped with dissolved air release 13 in one-level air flotation pool and the secondary air-floatation pond, dissolved air release links to each other with a dissolving 20 by dissolved air water pipe 21.Dissolving links to each other with a pneumatics level 23, and the water inlet pipe of dissolving links to each other with the secondary air-floatation pond, and water inlet pipe is provided with a dissolved air water pump 19.Be provided with stirrer 15 in the secondary air-floatation pond, the top in secondary air-floatation pond is respectively equipped with a dosing mouth 17 and a slag notch 18, is provided with a water outlet 22 in the secondary air-floatation pond.

In force, waste pipe 1, pond outer circulation water pipe 2, and one-level air flotation pool residue outlet 3, jointly enter mixing pit 4, mix after, through recycle pump and topping-up pump enter ejector 6, at this, to carrying out the triphasic mixing of gas, liquid, solid from the low-pressure gas source of gas blower 7, cutting and mass transfer.And utilizing its dump energy to spray downwards, the current that drive inner sleeve 8 are descending together, impel the looper stream (referring to Fig. 1) that constitutes an inside on the outer current direction of tube.Limited in view of the complementary energy of ejector, be to improve the internal recycle convection current fast and degree of perfection, simultaneously, also mainly be for further carry out to water body oxygenation outside sleeve, increase cloth Inka aeration pipe 9, its source of the gas still supply with by gas blower 7.Outer rim at strong circulation biochemistry pool IO is provided with peripheral weir 11, because it is away from rapid mixed flow band, therefore, current are evenly overflowed.The current that overflow are divided into two portions, and a little more than the liquid of influent waste water amount, gravity flow enters one-level air flotation pool 12, carries out solid-liquid separation; Rest part then supplies the pond outer circulation, and gravity flow enters mixing pit, carries out recirculation.Enter the water outlet of one-level air flotation pool, warp contacts with the microbubble that dissolved air release 13 disengages, and makes the zoogloea in the water become scum silica frost, overflows into ash pit 14, and flows back into the mixing pit repeated use certainly.The water outlet of one-level air flotation pool can directly be discharged under situation up to standard; Also can enter the secondary air-floatation pond,, further improve effluent quality by dosing, coagulation and dissolved air flotation for the second time.The I and II air flotation pool can a shared cover air dissolving system.

Claims

1, a kind of mixed aeration type biological treating system, it mainly comprises gas blower, the ejector that links to each other with gas blower, the mixing pit that is connected by pipeline with ejector, and the waste pipe that links to each other with mixing pit, it is characterized in that: the next door of mixing pit is provided with a circulation biochemistry pool, ejector is arranged in the circulation biochemistry pool, the top of circulation biochemistry pool is provided with two and overflows groove, one of them overflows groove and is connected by a pond outer circulating tube with mixing pit, another overflows groove and links to each other with the one-level air flotation pool by pipeline, the one-level air flotation pool links to each other with mixing pit by a mud return line, the one-level air flotation pool is connected with the secondary air-floatation pond again, gas blower links to each other with the circulation biochemistry pool by ventilator trunk, and is provided with the Inka aeration pipe in the ventilator trunk exit.

2, a kind of mixed aeration type biological treating system according to claim 1 is characterized in that: be provided with a sleeve in the circulation biochemistry pool, ejector is arranged in the sleeve, and the pipeline that ejector links to each other with mixing pit is provided with recycle pump.

3, a kind of mixed aeration type biological treating system according to claim 1 is characterized in that: the top of one-level air flotation pool is provided with two ash pits, and one of them ash pit links to each other with mud return line, and another ash pit is connected with the secondary air-floatation pond.

4, a kind of mixed aeration type biological treating system according to claim 1 is characterized in that: be equipped with dissolved air release in one-level air flotation pool and the secondary air-floatation pond, dissolved air release links to each other by dissolved air water Guan Yuyi dissolving.

5, a kind of mixed aeration type biological treating system according to claim 4 is characterized in that: the water inlet pipe of dissolving links to each other with the secondary air-floatation pond, and water inlet pipe is provided with a dissolved air water pump.

6, a kind of mixed aeration type biological treating system according to claim 3, it is characterized in that: secondary air-floatation is provided with stirrer in the pond, and the top in secondary air-floatation pond is respectively equipped with a dosing mouth and a slag notch, is provided with a water outlet in the secondary air-floatation pond.