CN1463252A

CN1463252A - Method for treatment of wastewater

Info

Publication number: CN1463252A
Application number: CN02801985A
Authority: CN
Inventors: 保罗·伍德利; 冯永全
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-31
Filing date: 2002-05-22
Publication date: 2003-12-24
Also published as: AUPR536401A0; WO2002096808A1

Abstract

Generally aerobic and anaerobic wastewater treatment plants require substantial areas of land for the effective treatment of liquid waste streams to achieve very low levels of Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) reduction. These plants are also very expensive to construct and operate. The size and cost of wastewater treatment plants can be reduced by the use of chemical treatment systems, however these are usually expensive to operate and do not achieve the low levels of BOD and COD required in satisfying regulating authorities globally. A system comprising pH control, settling, homogenisation under pressure and a combination of flocculation, flotation and treatment with concentrated ozone gas has the ability to achieve very low BOD and COD discharge levels as well as being cost-effective solution with regards to construction and operation.

Description

Method of wastewater treatment

Technical field

The present invention relates to a kind of method, comprise and from the waste water of a homogeneous solid separating tank, remove the flocculation waste material, and the mode with adverse current is further handled waste water with spissated ozone gas in identical solid separating tank, measure an acceptable standard with further minimizing BOD and COD, from jar, emit then.

Background technology

The subject matter that the factory of most of discharge liquid waste materials faces is how to handle this material effectively, and removes pollutent to reach acceptable emission level.Common treatment process comprises uses aerobic and anaerobic treatment equipment, although the system of these types can reach required result effectively, taken a large amount of soils, and running cost is very high.And for existing factory or place that those do not have enough spaces to hold the treatment facility of these types, it is impossible that these systems are installed.Solution is to use the small-sized treatment facility of chemical treatment class, yet these equipment are usually because the very high process cost of the very high needs of most of chemical preparations costs.The present invention by only use enough chemical preparationss condense in the waste water the material that is easy to flocculate and remove them by flotation process from the surface of jar, thereby reduce required chemical preparations amount.Then the waste water of gained is handled with super-saturated ozone gas in identical jar, can be reduced to an acceptable standard to remaining pollutent like this, then discharging.

Summary of the invention

The present invention relates to the method for a kind of effective minimizing total suspended solid (TSS), but the minimizing to BOD and COD has prior meaning because many chemical preparationss have been used in its minimizing.These chemical preparationss condense in waste water and the waste material that flocculates, and by using Im-Bu-Rator (IBR) air or other gas over-saturation are incorporated in the waste water, thereby remove pollutent.By using a custom-designed solid separating tank, the flocculation pollutent is floated to the capital in the solid separating tank, floats on Polluted area, removes from the surface with a mechanical doctor system then.Semisolid falls into the slide plate of inclination, assembles in a side of solid separating tank, removes by the lateral opening that is used to collect.The cleaning waste water of described processing still has and is higher than acceptable BOD and COD value, is transported to the second-stage treatment zone, contacts with spissated over-saturation ozone.Can be incorporated into the ozone over-saturation waste water of the processing of cleaning by using secondary IBR, described waste water is in the recirculation of the bottom of solid separating tank, this makes spissated ozone gas rise with low-down speed, pass the waste water of the processing of cleaning, described waste water moves down, bottom at the solid separating tank is left, and emits at last.

Detailed Description Of The Invention

Describe with reference to figure 1.

Waste water stream is located access arrangement in (1) and is handled, and is transported to the fs of processing then by pump (2).This regulates pH by acid or alkali (3) at injection point (4) usually, to be adapted at the required processing condition of condensing agent of institute's type of service in the technology.Yet, in some cases, can not need to regulate wastewater pH.

The waste water of crossing through pH regulator flows to dose point (6), adds the condensing agent (5) of dilution, pollutants in waste water is converged to form the little particle that condenses together.Congealing reaction needs the time, carries out at hold-up vessel (7), and required time can change to adapt to handled waste water.Waste water flows to the point that air or other gas can be introduced into then, forms liquid/gas mixture.This process is undertaken by part shut-off valve (8), and described valve (8) is positioned on the suction line of progression cavity pump (11); The part of valve (8) is closed the partial vacuum that forms pipeline (10).Air or other gas can enter pipeline (10) by pipeline (9), and described air or gas can be adjusted to the required requirement of technology in fluid.Pump (11) discharge liquid/air or gaseous mixture auto levelizer (12) make the gas over-saturation enter liquid.A device like this is Im-Bu-Rator (IBR), and IBR unit (12) can be located at the bottom of separating tank (31), and perhaps IBR (12) can be an independent separate unit.Be discharged into vertical-lift chamber (13) with air or the super-saturated waste water of other gas from IBR (12), here polymer flocculant (14) quantitatively added in proper order by injection pipeline (38).Polymer flocculant (14) works in waste water, and particle aggregation arrives together condensing.These flocculation particles are surrounded by superfine air or gas droplet, and adhere on it.The flocculation particle of the described bubble that has the ultra-fine air that adheres to or gas is upwards floating by chamber (13), enters separated region (15) at last, and the flocculation particle that has the air that adheres to or gas here is floating in second chamber region (16).Remove the ring-like zone (39) of flocculation particulate waste water by forming by chamber (13) and (16).Ring-like zone (39) forms by cylinder ring (16) and (45), and cylinder tank (45) is settled by two or more hold-down barss (44), and cylinder ring (16) is settled by plate (32) simultaneously.The flocculation particle is known as mud, is removed by contained waste water end face in from the chamber (15) by scraper (17), and described scraper is driven at end face back and forth by motor (37).Mud drops onto on the swash plate (32), and swash plate (32) separates chamber (18) and compartment wall (16) and outer jar (31).Plate (32) is settled with such angle, so that make mud flow to lower-most point (33), carries out next step processing from flowing out here again.The clarified wastewater of handling the wall by the wall of chamber (39) and chamber (31) form ring-like in flow downward.In this flowed downward, the clarified wastewater that may still contain the processing of some BOD and COD contacted with ozone gas, and described ozone gas can reduce BOD in the waste water and COD content to reach required emission request by chemical reaction.This ozonize process is performed such, and comprises the waste water of crossing from separating tank (31) separating treatment, delivers to a point that adds ozone gas through outlet connecting pipe line (19), forms liquid/gas mixture.When carrying out this process, part shut-off valve (20), it is positioned at the suction line of progression cavity pump (22); The part of valve (20) is closed in the pipeline (40) and has formed partial vacuum.Ozone gas can enter pipeline (40) by pipeline (21), and the ozone gas in the fluid can be regulated to satisfy processing requirement.Pump (22) is transported to liquid/ozone gas mixture in the device (23), makes described gas over-saturation enter liquid.A device like this is Im-Bu-Rator (IBR).The waste water of handling with the ozone gas over-saturation flows to pressure chamber (34), and pressure remains and is higher than 0.5bar.Liquid/ozone gas mixture is minimum here to stop 30 seconds.In order to guarantee the ozone gas supersaturated solution of in pressure chamber (34), can not overflowing, to close by the part of valve (36) and keep constant pressure, described valve (36) is placed in the outlet of pressure chamber (34).Liquid/gas mixture is through pipeline (41), and enter into chamber (18) than lower part and distribution device (24), liquid/ozone gas mixture along the chamber (18) than the lower part evenly distribute.Ozone gas is by chamber (18) vertical uplift, and (18) move down and the waste water of handling is along the chamber, contact with ozone gas, arrive the outlet line (25) of separating tank then.Be contained in ozone and any other gas vertical uplift in the waste water of chamber (18), up to the following side contacts of they and plate (32).Described plate tilts to place, and gas moves up along the lower surface of plate (32), arrives the vertex that plate (32) contacts with separating tank exterior wall (31) until them.The accumulative all gas can be discharged entering atmosphere by pipeline (30) on this aspect, or by gas recompression system recoveries, if mounted words.Waste water content in chamber (15) reaches as follows: the waste water of handling passes through pipeline (42) in point (25) (18) discharge from the chamber, through tank level control (26) vertical uplift; The liquid level that keeps stable is regulated in described tank level control (26) in chamber (15).The waste water of handling is transported to downward outlet line (43) from vertical uplift pipeline (25) by T-connecting piece, and air enters into pipeline (42) to prevent siphon by exhaust duct (27).The pH of the waste water of handling can be by regulating in injection point (29) injection acid or alkali through pipeline (28), to satisfy the requirement of management board.

Claims

1. sewage treatment equipment comprises:

A waterwater entrance, a waste water charge pump are used for that from described ingress waste water is added to a reagent and add system, with the pH regulator that carries out waste water and add condensing agent in waste water; The hold-up vessel of a waste water process that is added, and condensing of pollutent in the waste water taken place therein; A gas adding apparatus, on the pipeline between described hold-up vessel and the high-pressure pump, described gas adding apparatus is incorporated into air or other gas in the waste water, described high-pressure pump under high pressure joins a super homogenizer of fluid to waste water, and wherein any gaseous fraction is all dissolved into wastewater liquid highly saturatedly; Waste water is transported to saturated jar an of separation then, and described separation comprises a vertical uplift chamber for saturated jar, and the waste water of super homogenizing vertically passes through thus, and described rising chamber has a flocculation agent injection device; With second Room, it is around the top of described vertical uplift chamber, on described vertical uplift chamber, has a separated region, the buoyant particle that condenses is removed by a kind of doctor blade device therein, described second Room is contained the ring-like zone around the vertical uplift chamber in addition, removes particulate waste water and drops to the 3rd Room thus, and described the 3rd Room is around the rising chamber and second Room, have venting port at its top, have the ozone injection device in its bottom; With a wastewater outlet.