Background technology
A large amount of mineral metal products and colliery resource are contained the southwest in China, and most of metal mine and colliery all exist with the form of metallic sulfide.The sulfide with in obsolete metal mine or the colliery of existing exploitation is exposed in the air; Under oxygen and action of microorganisms; After
process, form sulphate cpd and be dissolved in the water; So; Not only increase the concentration of heavy metal ion in the water, and improved the acidity (promptly having reduced the pH value of water body) of water body.
Acidic mine waste water pH value is low, acidity is big, and contains plurality of heavy metal, generally directly recycle; Usually enter water bodys such as near river, mine, lake; The pH value of water body is changed, suppress or stoped bacterium and microbial growth, hinder the self-cleaning of water body.Mineral substance in sour water and the water body interacts and generates some salt; Growth to limnobios and plant produces detrimentally affect; Cause water body severe contamination around the mining area, cause that most hydrobionts such as fish, algae, planktonic organism are dead, and destroy soil aggregate; Make the hardening soil, farm crop are withered and yellow; Under anoxic condition, a large amount of in the acidic mine waste water
Receive the effect of sulfate reduction mushroom, produce H
2S gas, H
2S gas has serious toxic action to organism; Acid waste water produces the effect of intensive corrosion failure to water pump accessory, tubing, tunnel equipment, causes ME frequent.If natural water body receives acid pollution for a long time; Can make water quality acidifying gradually, thereby mining industry production and ecotope have been caused serious negative impact, and in case get into and will constantly accumulate behind the environment and be difficult to remove; Cause the chronic pollution of environment; Also can polluted underground water, take place in case pollute, be difficult to administer.So the processing to acid waste water seems particularly important.
The pollution of acidic mine waste water is a worldwide problem, mainly is washup, the mine tailing wastewater that discharge in drench with rain sewage and the dressing-works of the exploitation of colliery and the metal mine pit water, the waste rock pile that are discharged.The domestic and international at present improvement method about acid wastewater in mine mainly contains physics method (absorption method), chemical method (flocculence, the precipitator method, chelate method), membrane processing method and artificial swamp method etc.And the neutralization precipitation method is the same for treating acidic mine wastewater mature methods.
The neutralization precipitation method is to adopt Wingdale or lime to carry out neutralizing treatment as neutralizing agent. utilizes the acid-base neutralisation reaction to generate the precipitation of hydroxide that is insoluble in water, purifies waste water, improve the pH value of waste water.The feeding mode of neutralization precipitation method has 3 kinds of technical process usually:
1, directly adds lime method
Lime is mixed with milk of lime drops into reactive channel and flow into reaction tank, again in the settling tank post precipitation is removed and resultant;
2, in the Wingdale and drum process
Wingdale is placed in the cylinder,, neutralization reaction is continued by the rotation expansion sour water of cylinder and the contact surface of Wingdale;
3, flow lifting type becomes filtering velocity expansion neutralisation
With fine particle Wingdale or the rhombspar neutralizing tower of packing into, neutralization reaction takes place from top to bottom through filtrate in current;
Except that above 3 kinds of process for treating acidic sewage flow processs; Other technology mainly is in equalizing tank, to carry out for the processing of pH; The method of regulating can also be through adding other alkaline reagentss (like soda-lime, slaked lime, flying dust, lime carbonate, blast furnace slag, rhombspar, yellow soda ash, caustic alkali etc.), to reach the effect that improves acidic solution pH.And in most process for treating acidic sewage; For the main mostly treatment process that adopts preliminary sedimentation tank, second pond and filtering basin etc. to unite use of the processing of PM for particulate matter, in settling tank often through increase baffle plate with residence time of increasing waste water add flocculation agent or sedimentary method that coagulating agent quickens PM for particulate matter to remove PM for particulate matter.
Existing acid wastewater in mine treatment process all each has certain shortcoming at present, mainly comprises:
(1) be prone to form larger particles in the reaction tank and be deposited at the bottom of the pond, reduce the utilization ratio of lime, the body refuse amount is big, complex management.
(2) because of a large amount of CaSO
4Produce deposition at inner wall of rotary drum water outlet place, cause cylinder internal diameter effective dimensions to reduce, stop up water outlet,, reduce plant factor, and equipment is huge so need often to clean, complex structure, investment is big, and noise is big during running.
(3) contain a large amount of suspended substances in the acid mine water, cause the obstruction in flow lifting type expansion filter tank easily. so particle diameter of filter medium is strict, simultaneously; Contain acid concentration for waste water restriction is arranged; It is lower to handle back pH value, needs to replenish to handle and could discharge, and treatment facility can not overload operation.
Because in the process of PM for particulate matter deposition and pH regulator, need to add various industrial reagent with settling velocity that improves PM for particulate matter and the pH value that improves waste water, this makes the cost of entire treatment technology increase.And owing to need to add other particulate matter, this has also increased workload and intractability for the subsequent processing steps of technology such as solid-liquid separation etc.The adjusting of pH is simultaneously carried out in different ponds respectively with the deposition of PM for particulate matter, and this makes the floor space increase of treatment process, and then has increased the processing cost of technology and increased the workload of technology.
Summary of the invention
The object of the present invention is to provide a kind of reaction tank and method of same for treating acidic mine wastewater, the pH value of ability adjustment of acidity waste water is removed heavy metal ion.
The objective of the invention is to realize: a kind of reaction tank of same for treating acidic mine wastewater through following technical scheme; Comprise the pond body; Inlayed the basic material layer in the body of pond on the surface of civil engineering structures, the civil engineering structures comprise the pond body around pool wall, pond at the bottom of and the baffle plate that is provided with of Chi Tizhong.
Described basic material layer is a calcium carbonate layer.
It is preliminary sedimentation tank, second pond, filtering basin or waste liquid pool in the acid waste water treating processes.
Be provided with import on its end pool wall, be provided with outlet (6) on the other end pool wall.
A kind of method of same for treating acidic mine wastewater; With the PM for particulate matter precipitation process of acidic mine waste water and pH regulator process synthesis in a reaction tank; Utilization is embedded in the part that the lip-deep basic material layer of civil engineering structures constitutes the civil engineering structures; Carry out PM for particulate matter deposition and pH regulator simultaneously, accomplish Treating Acid Mine Wastewater.
The beneficial effect of the inventive method is: the acidic mine waste water that neutralized, promoted the pH value of acid waste water preferably, and quickened the deposition of heavy metal ion PM for particulate matter; Reduced the workload of waste water treatment process; Simultaneously also avoided calcium carbonate granule to separate this complicated process with the turbid solution of water, simplified the operation easier of technology, it is low to have cost; The characteristics that operability is good are specially adapted to the processing small-sized or acid waste water that abandoned mine discharges.
Embodiment
Further describe technical scheme of the present invention below in conjunction with accompanying drawing, but require the scope of protection to be not limited to said.
Like Fig. 1, a kind of reaction tank of same for treating acidic mine wastewater comprises pond body 1, has inlayed basic material layer 2 in the pond body 1 on the surface of civil engineering structures, the civil engineering structures comprise pond body 1 around pool wall 3, pond at the bottom of 7 and pond body 1 in the baffle plate 4 that is provided with.
Described basic material layer 2 is a calcium carbonate layer.
It is preliminary sedimentation tank, second pond, filtering basin or waste liquid pool in the acid waste water treating processes.
Be provided with import 5 on its end pool wall 3, be provided with outlet 6 on the other end pool wall 3.
A kind of method of same for treating acidic mine wastewater; With the PM for particulate matter precipitation process of acidic mine waste water and pH regulator process synthesis in a reaction tank; Utilization is embedded in the part that the lip-deep basic material layer 2 of civil engineering structures constitutes the civil engineering structures; Carry out PM for particulate matter deposition and pH regulator simultaneously, accomplish Treating Acid Mine Wastewater.
The present invention inlays one deck basic material on inwall, bottom and the settling tank Internal baffle surface of the civil engineering structures such as preliminary sedimentation tank, second pond, filtering basin and waste liquid pool in the acid waste water treating processes, comprises ls materials such as marble, Wingdale, calcite, rhombspar.Utilize the weakly alkaline of basic material, can reduce on the one hand the acidity of waste water, improve the pH value of waste water, for the adjusting of acid waste water pH provides guarantee.Experimental study proves that in long duration of contact, waste water ph after treatment remains within the 7-8.So, both having prevented that waste water ph is too high or too low does not exist the pollution problems of the potential of hydrogen of water outlet to natural water body to the corrosion on Equipment effect yet.In addition, can the part waste water that pass through after the precipitation process be carried out internal reflux to preliminary sedimentation tank, get into the mine wastewater of settling tank, improve water inlet pH value with dilution.The raising of pH simultaneously can reduce the solubleness (solubleness of most of heavy metal raises with the reduction of pH) of heavy metal ion to a certain extent, is convenient to the removal of heavy metal ion; On the other hand, acidic mine waste water flows into from the import 5 of reaction tank, flows out from exporting 6; Arrow is depicted as the flow direction of current among the figure; The entire treatment process is incorporated into the precipitation process of PM for particulate matter and two steps of adjusting of pH in the reaction tank with current spontaneous generation, thus the expense of having saved technology floor space and required medicament item; Reduce the cost of waste water treatment process to a certain extent, improved the possibility that this technology is promoted.Moreover, after civil engineering structures inwall and lower surface are inlayed the last layer marble material, can reduce the contact area of acid waste water and civil engineering structures, reduce its extent of corrosion to the civil engineering structures, play the purpose of protection civil engineering structures.The present invention is with the part as civil engineering structures such as settling tanks such as the basic material of marble etc.; Rather than regulate waste water ph through adding calcium carbonate granule merely; So, both avoid the continuous adding of calcium carbonate granule, reduced the workload of waste water treatment process; Simultaneously also avoided calcium carbonate granule to separate this complicated process, simplified the operation easier of technology with the turbid solution of water.After for many years, when the basic material neutralising capacity of marble etc. descends, can inlay one deck marble material on the surface of structures inwall and bottom again.
In order to guarantee the pH value of water outlet; Under a stable condition, also can in settling tank, throw in block Wingdale or the marble and acidic mine waste water; But this method is after adding block Wingdale or marble to settling tank; May have influence on the cleaning of mud in the settling tank, therefore need do some improvement to the settling tank structure, this invention also should be included within the protection domain.