CN103979733A

CN103979733A - Method for carrying out purifying treatment on coal mine underground wastewater

Info

Publication number: CN103979733A
Application number: CN201410208497.6A
Authority: CN
Inventors: 赵成; 赵鑫
Original assignee: Shanxi Qing Ze Environmental Science And Technology Co Ltd
Current assignee: Shanxi Qing Ze Environmental Science And Technology Co Ltd
Priority date: 2014-05-16
Filing date: 2014-05-16
Publication date: 2014-08-13
Anticipated expiration: 2034-05-16
Also published as: CN103979733B

Abstract

The invention provides a method for carrying out purifying treatment on coal mine underground wastewater. The method comprises the following steps that: the coal mine underground wastewater passes through at least two grids inside a grid pond; the wastewater automatically flows into a regulating pond after passing through the grids; the wastewater is lifted to an anaerobic pond by virtue of a submersible sewage pump positioned in the regulating pond; the wastewater treated by the anaerobic pond automatically flows into an anoxic pond; the wastewater which flows through the anaerobic pond is discharged into an aerobiotic pond; the wastewater from the anaerobic pond and mixed liquor which is refluxed from the aerobiotic pond and nitrified are sufficiently mixed in the anoxic pond and subjected to nitration reaction under an anoxic condition; the wastewater automatically flows into the aerobiotic pond after passing through the anoxic pond, carbonaceous organic materials contained in the wastewater are degraded, and ammonia nitrogen contained in the wastewater are nitrified. The method provided by the invention can be used for denitrifying and dephosphorizing the coal mine wastewater, thereby saving the water resources and preventing the environmental pollution.

Description

Purifying process of waste water under a kind of coal mine

Technical field

The purification of waste water, the treatment technology that the present invention relates to field of Environment Protection, relate in particular to purifying process of waste water under a kind of coal mine.

Background technology

Under colliery and waste gas coal mine, waste water is a kind of source of pollution, is also a kind of water resources of preciousness.The existing colliery of current China is serious water shortage on the one hand, down-hole waste water is also often just processed directly outer being discharged in the middle of environment without blowdown on the other hand, cause the havoc of environment, simultaneously serious waste water resources, restricted the production of coal industry and the Sustainable development of Economy of Mine Regions, so this realistic problem is needed solution badly.The method that under current domestic processing coal mine, waste water is taked generally adopts the flocculation agent precipitator method, but this can only remove some impurity in waste-water from coal mine, and do not have any effect for the water quality of rich Nitrogen-and Phosphorus-containing, cause these water bodys that are rich in nutrient laden to run off in vain.Simultaneously, in ore dressing water and coal washing waste water except containing a large amount of suspension mineral dust or metal ion, also contain all kinds of flotation agent, and coal washing waste water has the advantages that SS concentration is high, COD content is large, therefore, black water not only has the character of suspension liquid, also often with the character of colloid, fine coal slurry particle, clay particle equigranular are very little, and it is quiet heavy to be difficult for, make that such contaminated wastewater is heavy, intractability is large, if process badly, can cause the serious wasting of resources and environmental pollution.

Summary of the invention

The present invention proposes purifying process of waste water under a kind of coal mine, has solved the technical problem of purification of waste water under coal mine and utilization in prior art.

Technical scheme of the present invention is achieved in that

Purifying process of waste water under a kind of coal mine, adopt second-stage treatment technique, that adopt biological treatment to remove in waste water, to dissolve under coal mine and be the organic pollutant that colloidal form exists, it is characterized in that: this treatment process comprises the following steps: waste water under coal mine by least twice grid in grating tank (1); Waste water is from flowing into equalizing tank (2) after grid, and described equalizing tank (2) end is provided with submersible sewage pump, and the operation of the middle lift pump (3) of described equalizing tank (2) is subject to the control of liquid-level floater; The submersible sewage pump of waste water in equalizing tank (2) is promoted to anaerobic pond (4), and the microorganism in waste water utilizes poly-phosphorus hydrolysis that energy absorption organism is provided, and discharges phosphorus simultaneously; Waste water after anaerobic pond (4) is processed, from flowing into anoxic pond (5), utilizes heterotroph aerobic-anaerobic microbe to carry out denitrification, to remove the NH in waste water ₃-N and degradation of organic substances; The waste water of the anaerobic pond of flowing through (4) is entered to Aerobic Pond (6), by bacterium, the oxidation operation of absorption is decomposed, and provide the energy, from waste water, absorb phosphorus simultaneously, and store with the form of poly-phosphate, by excess sludge is discharged to system, the phosphorus of simultaneously also bacterium being taken in is drained; The mixed solution nitrated with the process refluxing from Aerobic Pond (6) from the waste water of anaerobic pond (4) fully mixes anoxic pond (5), under anoxia condition, carry out nitration reaction, make nitric nitrogen in backflow mixed liquor and the nitrogen in nitrite nitrogen be reduced into nitrogen and overflow from water, and utilize the facultative anaerobe in waste water the larger molecular organics oxygenolysis of aerobic bacteria hard degradation to be become to be easy to the small organic molecule decomposing; Waste water from flowing into Aerobic Pond (6), is explained and carries out nitrated to the ammonia nitrogen in waste water the carbonaceous organic material in waste water after anoxic pond (5).

As a kind of preferred embodiment of the present invention, in anoxic pond (5), be provided with floating stuffing, as bacteria carrier.

As the preferred embodiment of another kind of the present invention, in Aerobic Pond (6), be provided with floating stuffing and aerating system, and described aerating system can adopt Root's blower.

Beneficial effect of the present invention is:

The invention provides purifying process of waste water under a kind of coal mine, can carry out denitrogenation dephosphorizing to coal mine waste water, not only saved water resources but also avoided environmental pollution, and single unit system floor space is little, do not need sludge reflux, operational management is convenient, and Treatment Stability is high, has not only saved water resources but also avoided environmental pollution.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the process flow sheet of purifying process of waste water under a kind of coal mine of the present invention.

In figure:

1, grating tank; 2, equalizing tank; 3, lift pump; 4, anaerobic pond; 5, anoxic pond; 6, Aerobic Pond

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

The present invention as shown in Figure 1, purifying process of waste water under a kind of coal mine, adopt second-stage treatment technique, adopt biological treatment to remove in waste water, to dissolve under coal mine and be the organic pollutant that colloidal form exists, first by waste water under coal mine by least twice grid in grating tank 1, waste water certainly flows into equalizing tank 2 after grid, equalizing tank 2 plays regulating pondage, the effect of homogenizing water quality, because the waste water under coal mine has period ununiformity in discharge, the feature that variation factor is large, the impact of impact load when as far as possible reducing discharge of wastewater, to reach desirable treatment effect, need to regulate by 2 pairs of waste water water yields of equalizing tank, to guarantee amount constant of the organic pollutant in biochemistry pool, so need the waste water of different periods to mix in equalizing tank 2, described equalizing tank 2 ends are provided with submersible sewage pump, and in described equalizing tank 2, the operation of lift pump 3 is subject to the control of liquid-level floater, can make the water level water pump when in high liquid level in equalizing tank 2 automatically start, when low liquid level, water pump stops automatically, the submersible sewage pump of waste water in equalizing tank 2 is promoted to anaerobic pond 4, and the microorganism in waste water utilizes poly-phosphorus hydrolysis that energy absorption organism is provided, and discharges phosphorus simultaneously, and the content of Phosphorus From Wastewater is raise, and BOD content reduces, waste water after anaerobic pond 4 is processed, from flowing into anoxic pond 5, is provided with floating stuffing in anoxic pond 5, as bacteria carrier, utilizes heterotroph aerobic-anaerobic microbe to carry out denitrification, to remove the NH in waste water ₃-N and degradation of organic substances, the waste water of the anaerobic pond 4 of flowing through is entered to Aerobic Pond 6, by bacterium, the oxidation operation of absorption is decomposed, and provide the energy, from waste water, absorb phosphorus simultaneously, and store with the form of poly-phosphate, by excess sludge is discharged to system, the phosphorus of simultaneously also bacterium being taken in is drained, thereby reach the object of removing phosphorus, the aerating system that can be provided with floating stuffing simultaneously and adopt Root's blower to form in Aerobic Pond 6, it is low that the aerator of the type has noise, air quantity is large, energy consumption is low, operate steadily, the advantage such as easy for installation, the operation of aerator comprises two kinds of patterns simultaneously, a kind of is to synchronize with waste water lifting pump 3, another kind is timing operation, two kinds of patterns are moved simultaneously, to guarantee the concentration of aerobic bacteria, the mixed solution nitrated with the process refluxing from Aerobic Pond 6 from the waste water of anaerobic pond 4 fully mixes anoxic pond 5, under anoxia condition, carry out nitration reaction, denitrifying bacteria in waste water is usingd in raw wastewater carbon source organism as hydrogen electron donor, using nitric nitrogen as electron acceptor(EA), make nitric nitrogen in backflow mixed liquor and the nitrogen in nitrite nitrogen be reduced into nitrogen overflows from water, thereby reach the object of denitrogenating, and utilize the facultative anaerobe in waste water the larger molecular organics oxygenolysis of aerobic bacteria hard degradation to be become to be easy to the small organic molecule decomposing, improve its biodegradability, for aerobic biochemical creates favorable conditions, and floating stuffing is set in anoxic pond 5, as bacteria carrier, specific surface area is large, attached microbial amount is many, thereby increase its processing power, waste water certainly flows into Aerobic Pond 6 after anoxic pond 5, carbonaceous organic material in waste water is explained and carried out nitrated to the ammonia nitrogen in waste water, in the waste water of tentatively having been degraded from anoxic pond 5, ammonia nitrogen removal is less, it is only 20% left and right, but under the effect of aerobic microbiological (nitrifier), most of itrogenous organic substance can be changed into nitrite and nitrate, thereby reach the conversion of ammonia nitrogen, to be back to anoxic pond 5, carry out ammonia nitrogen processing, the interior placement floating stuffing of Aerobic Pond 6 and aerating system, packing specific area is large, can adhere to a large amount of microorganisms, biofilm is fast, and demoulding is easy, during operation, to air filled cavity, can play good cutting action, make air pocket cutting effect bubble, increase gas-to-liquid contact area, promote the transmission of oxygen, thereby improve treatment effect.Aeration intensity is high, and not fragile, gas distribution is even, and drag losses is little, anticorrosive, and the utilization ratio of oxygen, up to more than 15%, is used in conjunction with filler, can reach larger energy-saving effect.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims

1. a purifying process of waste water under coal mine, adopts second-stage treatment technique, adopt biological treatment to remove in waste water, to dissolve under coal mine and be the organic pollutant that colloidal form exists, it is characterized in that: this treatment process comprises the following steps:

(1) waste water under coal mine is passed through at least twice grid in grating tank (1);

(2) waste water is from flowing into equalizing tank (2) after grid, and described equalizing tank (2) end is provided with submersible sewage pump, and the operation of the middle lift pump (3) of described equalizing tank (2) is subject to the control of liquid-level floater;

(3) submersible sewage pump of waste water in equalizing tank (2) is promoted to anaerobic pond (4), and the microorganism in waste water utilizes poly-phosphorus hydrolysis that energy absorption organism is provided, and discharges phosphorus simultaneously;

(4) waste water after anaerobic pond (4) is processed, from flowing into anoxic pond (5), utilizes heterotroph aerobic-anaerobic microbe to carry out denitrification, to remove the NH in waste water ₃-N and degradation of organic substances;

(5) waste water of the anaerobic pond of flowing through (4) is entered to Aerobic Pond (6), by bacterium, the oxidation operation of absorption is decomposed, and provide the energy, from waste water, absorb phosphorus simultaneously, and store with the form of poly-phosphate, by excess sludge is discharged to system, the phosphorus of simultaneously also bacterium being taken in is drained;

(6) from the waste water of anaerobic pond (4) mixed solution nitrated with the process refluxing from Aerobic Pond (6), anoxic pond (5), fully mix, under anoxia condition, carry out nitration reaction, make nitric nitrogen in backflow mixed liquor and the nitrogen in nitrite nitrogen be reduced into nitrogen and overflow from water, and utilize the facultative anaerobe in waste water the larger molecular organics oxygenolysis of aerobic bacteria hard degradation to be become to be easy to the small organic molecule decomposing;

(7) waste water, from flowing into Aerobic Pond (6) after anoxic pond (5), is explained and carries out nitrated to the ammonia nitrogen in waste water the carbonaceous organic material in waste water.

2. a kind of coal mine method of wastewater treatment according to claim 1, is characterized in that: in anoxic pond (5), be provided with floating stuffing, as bacteria carrier.

3. a kind of coal mine method of wastewater treatment according to claim 1 and 2, is characterized in that: in Aerobic Pond (6), be provided with floating stuffing and aerating system.

4. a kind of coal mine method of wastewater treatment according to claim 3, is characterized in that: described aerating system can adopt Root's blower.