Wastewater from mechanical industry treatment process
Technical field
The present invention relates to sewage treatment field, especially a kind of wastewater from mechanical industry treatment process.
Background technology
Mechanical processing sewage main source is that metallic wastewaters, the waste water such as workshop manufacture cleaning iron content waste water include mainly:It washes
It washs outside the waste water oil removals such as waste water, cleaning waste water, cleaning ground waste water, emulsifying liquid waste water, also containing there are many grease, pH value
In acidity, COD high, biodegradability is poor.Water quality is more complex, is unable to direct emission.It is huge to be machined water consumption, how to utilize useless
It is engineering difficult point that water, which carries out recovery processing,.
Invention content
That the purpose of the present invention is to provide a kind of flows is simple, operating cost is low, safe and reliable to operation, water stabilization is up to standard
Wastewater from mechanical industry treatment process.
To achieve the above object, wastewater from mechanical industry treatment process of the invention, waste water retain bulky grain by grid pond
After substance, demulsification reaction dephosphorization is carried out into demulsification pond, carries out dissolved air flotation subsequently into air floatation machine, then sequentially enter anaerobism
Pond, anoxic pond, aerobic tank carry out biochemical treatment, are separated by solid-liquid separation subsequently into sedimentation basin, finally up to standard by filtering, sterilizing
After discharge.
Further, specific process step is as follows:
(1)Pretreatment:Waste water enters grid pond and retains large particulate matter by grid, then from regulating reservoir is flowed into equilibrium water
Matter water, makes waste water even into subsequent processing units;
(2)Demulsification reaction dephosphorization:Waste water enters demulsification pond, and CaCl is put into demulsification pond2, add PAC and flocculate
Sedimentation;
(3)Dissolved air flotation:Waste water enters air floatation machine, and the suspension flco in waste water is adhered to the microbubble of air floatation machine generation
On, it climbs up on top of the water with bubble, forms dross and scrape removing dross;
(4)AAO technique biochemical treatments:Waste water sequentially enters anaerobic pond, anoxic pond, aerobic tank, and by the mixing of aerobic tank
Liquid and the sludge in post precipitation pond flow back into anoxic pond, the wherein built-in flexible biologic packing material of anaerobic pond, anoxic pond simultaneously, will give up
Deliquescent macromolecule, hard-degraded substance are decomposed into low molecule, degradable substance in water, improve the ratio of BOD/COD, enhancing
Biodegradability;Then waste water carries out Aerobic Process for Treatment from aerobic tank is flowed into, and the elastic biological filler installed in aerobic tank is attached with
Oxygen bacterium is handled the organic substance in waste water by aerobic bacteria and the extraneous oxygen provided;
(5)It is separated by solid-liquid separation:From flowing into sedimentation basin, solid impurity caused by biochemical treatment can flow out waste water with waste water, sink
Shallow lake pond carries out settlement treatment to solid impurity;Meanwhile the activated sludge that biochemical treatment generates is sunk in sedimentation basin with waste water
It forms sediment and detaches, most of activated sludge flows back into anoxic pond, and excess sludge is discharged to sludge concentration tank and carries out concentration;
(6)Filtering:Waste water is sent to pressure filter by water pump and is filtered from intermediate pool is flowed by waste water;
(7)Sterilize water storage:Waste water by filtering carries out disinfection in sterilization pool, final qualified discharge water storage.
The anaerobic pond, anoxic pond effective stay time are 10~12 hours.
The space network of elastic biological filler for the benefit of aerobic bacteria attachment in the aerobic tank.
The oxygen provided needed for the aerobic tank makes in such a way that air blower carries out aeration aerating to waste water in aerobic tank
Dissolved oxygen be maintained at 2.0mg/L.
The sedimentation basin is vertical-flow inclined-tube sedimentation tank, and sedimentation basin surface loading is 1.0m3/m2.h, hydraulic detention time is
4.5h。
The substantive distinguishing features of the present invention and progress are:
The application wastewater from mechanical industry treatment process has the beneficial effect that:
(1)First using demulsification reaction dephosphorization, air floatation machine is then taken to remove the suspended matter in waste water, effective purified water
Matter.
(2)Using AAO technique biochemical treatments, 1. so that flow is simple, structures are few, and capital cost is greatly saved, and
Operating cost is low, and floor space is small;2. using in raw wastewater carbonaceous organic material and endogenous metabolism product as carbon source, save and add
The expense of outer carbon source, and the C/N ratios of raising are obtained, to ensure the abundant progress of denitrification;3. anoxic pond aerobic tank it
Before, since denitrification consumes a part of organic matter in waste water, the organic loading of aerobic tank had not only been alleviated in this way, but also can improve
The settling property of activated sludge is in favor of controlling sludge bulking, and the basicity that denitrification process generates can compensate nitrifying process
Consumption to basicity.
(3)High degree of automation, effluent characteristics are stablized.
Description of the drawings
Fig. 1 is the process flow diagram of the present invention.
Specific implementation mode
Below in conjunction with drawings and examples, the present invention is described further.
The wastewater from mechanical industry treatment process of the present invention, specific process step are as follows:
(1)Pretreatment:Waste water enters grid pond and retains large particulate matter by grid, and large particulate matter is avoided to enter sewage
Processing system results in blockage.Make waste water even into subsequent processing units with Balance Water Quality water from regulating reservoir is flowed into again.
It is arranged by regulating reservoir, energy fully Balance Water Quality, water enable sewage is relatively uniform to enter subsequent processing units,
The shock resistance for improving whole system reduces the design scale of processing unit.Advantageously reduce operating cost and variation water quality band
The influence come.In view of wastewater from mechanical industry coefficient of variation is bigger, regulating reservoir designs hydraulic detention time 24 hours.
(2)Demulsification reaction dephosphorization:Waste water enters demulsification pond, and CaCl is put into demulsification pond2, add PAC and flocculate
Sedimentation.
Because of mechanic factory workers, there are many cathode active agent on surface, has a large amount of phosphorus reagent, waste water that must first be broken
Breast reaction.CaCl2Generation calcium phosphate is carried out, water is not readily dissolved in, is added after PAC carries out biochemical flocculating setting and goes dephosphorization.
(3)Dissolved air flotation:Waste water enters air floatation machine, and the suspension flco in waste water is adhered to the microbubble of air floatation machine generation
On, it climbs up on top of the water with bubble, forms dross and scrape removing dross.
Air floatation machine be using air and water under-fixed pressure condition, so that gas is greatly dissolved in water, make every effort to
In saturation state, is then discharged the molten carbonated drink of pressure is formed by by depressurizing, a large amount of micro air bubble is generated, and in waste water
Suspension flco come into full contact with, so that suspension flco is adhered on micro air bubble, climb up on top of the water with bubble, formed dross, scrape
Removing dross can reach purpose of purifying the water quality.
(4)AAO technique biochemical treatments:Waste water sequentially enters anaerobic pond, anoxic pond, aerobic tank, and by the mixing of aerobic tank
Liquid and the sludge in post precipitation pond flow back into anoxic pond, the wherein built-in flexible biologic packing material of anaerobic pond, anoxic pond simultaneously, will give up
Deliquescent macromolecule, hard-degraded substance are decomposed into low molecule, degradable substance in water, improve the ratio of BOD/COD, increase
Strong biodegradability;Then waste water carries out Aerobic Process for Treatment from aerobic tank is flowed into, the elastic biological filler attachment installed in aerobic tank
There is aerobic bacteria, the organic substance in waste water is handled by aerobic bacteria and the extraneous oxygen provided.
AAO techniques are a kind of front establishment methods, belong to single-stage sludge denitrification technique, i.e., only there are one sludge recirculation systems
It is alternately under aerobic and anoxia condition with the microorganism species of mixed-liquor return system, mixed liquor, in organic concentration height
Or its different effect will be played when low respectively.Its technological process is the advanced anoxic pond of waste water, then into aerobic tank, and by aerobic tank
Mixed liquor and sedimentation basin sludge simultaneously flow back into anoxic pond.
The built-in flexible biologic packing material of anaerobic pond, anoxic pond, it acts as by deliquescent macromolecule in waste water, difficult to degrade
Substance decomposition is low molecule, degradable substance enhances biodegradability to improve the ratio of BOD/COD, is subsequent
Aerobic Process for Treatment provides condition, and anaerobic pond, anoxic pond effective stay time are 10~12 hours, COD removal rates about 30~60%.It is useless
Water carries out Aerobic Process for Treatment from aerobic tank is flowed into.The built-in flexible biologic packing material of aerobic tank, the elastic biological filler are for the benefit of aerobic
The space network of bacterium attachment, has good gas distribution distribution performance, the treatment effect of aerobic tank, netted knot is greatly improved
Structure can make aerobic bacteria be easy to adhere to, and be handled the organic substance in water by aerobic bacteria after biofilm, and the external world to be provided
Substance be oxygen, the present invention using air blower to waste water carry out aeration aerating, so that contact-oxidation pool dissolved oxygen is maintained at
The level of 2.0mg/L.COD and BOD is able to 80% or more removal.
(5)It is separated by solid-liquid separation:From flowing into sedimentation basin, solid impurity caused by biochemical treatment can flow out waste water with waste water, sink
Shallow lake pond carries out settlement treatment to solid impurity;Meanwhile the activated sludge that biochemical treatment generates is sunk in sedimentation basin with waste water
It forms sediment and detaches, most of activated sludge flows back into anoxic pond, and excess sludge is discharged to sludge concentration tank and carries out concentration.
It is 1.0m that sedimentation basin, which uses vertical-flow inclined-tube sedimentation tank, sedimentation basin surface loading,3/m2.h, hydraulic detention time is
4.5h.Also there are one the process of metabolism, the biomembrane of aging death can fall off and be drifted out with water the microorganism of aerobic tank, sink
Shallow lake pond carries out settlement treatment to the biomembrane to fall off.Meanwhile sedimentation basin makes activated sludge and waste water carry out precipitation to detach, wherein greatly
To anoxic pond, excess sludge is discharged to sludge concentration tank and carries out concentration amount of activated sludge reflux.
(6)Filtering:Waste water is sent to pressure filter by water pump and is filtered from intermediate pool is flowed by waste water.
(7)Sterilize water storage:Waste water by filtering carries out disinfection in sterilizing tank, final qualified discharge water storage.