CN102503048A - System and method for treating high-concentration sewage generated by directly liquefying coal - Google Patents
System and method for treating high-concentration sewage generated by directly liquefying coal Download PDFInfo
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Abstract
The invention relates to a system for treating high-concentration sewage generated by directly liquefying coal. The system comprises a cavitation air flotation machine, a priming reservoir and a homogenizing tank which are sequentially connected, as well as an anaerobic biochemical pool, a facultative biochemical pool, an aerobic biochemical pool, an activated carbon adsorption tank, a coagulation reaction tank, a coagulative sendimentation tank, a filtering priming reservoir and a filtering adsorption tank which are sequentially connected, wherein an acidification pool is arranged between the homogenizing tank and the anaerobic biochemical pool; the homogenizing tank, the acidification pool and the anaerobic biochemical pool are sequentially connected; an acidification device is arranged between an anaerobic biochemical pool outlet and a facultative biochemical pool inlet; and an alkalization device is arranged between a facultative biochemical pool outlet and an aerobic biochemical pool inlet. The invention also relates to a method for treating the high-concentration sewage generated by directly liquefying the coal. After the sewage generated by directly liquefying the coal is treated by the system and the method for treating the high-concentration sewage generated by directly liquefying the coal, the treatment effect of the high-concentration sewage generated by directly liquefying the coal can be remarkably improved and all product water reaches the standard and can be recycled.
Description
Technical field
The present invention relates to a kind of Sewage treatment systems and treatment process.More specifically, the present invention relates to a kind of high-concentration sewage treatment system and treatment process.
Background technology
Erdos coal system oil content company of group of Shenhua has the production equipment of the first cover large industrialized coal direct liquefaction production oil product in the world.Direct coal liquefaction technology worldwide received much concern in recent years.The sewage water yield of the DCL/Direct coal liquefaction device discharging of coal liquefaction plant is big, concentration is high, complicated component, does not have similar WWT experience to use for reference both at home and abroad.
The existing high-concentration sewage treatment system of coal liquefaction plant adopts " immobilization high-effective microorganism sewage treatment ", and the structure iron of this system is seen Fig. 1.
Oleaginousness is not more than 100mg/L in the DCL/Direct coal liquefaction high-concentration sewage, therefore adopts air flotation turbo that oleaginousness is dropped to below the 10mg/L, can remove part suspended substance (SS), volatile phenol and part COD (COD) simultaneously.The air supporting water outlet promotes with pump and gets into even matter jar from flowing into the biochemical priming reservoir of high-concentration sewage, to guarantee the stable of the subsequent biological treatment water yield, water quality, prevents to produce big impact.
Even matter jar water outlet is from flowing into biochemical treatment system.Biochemical treatment system is disposed with anaerobism (AF1), hold concurrently oxygen (AF2) and aerobic (BAF) three sections, i.e. three biochemistry pools, and being filled with the high-performance bio carrier respectively and inoculating has high-effective microorganism.The main effect of 3T-AF1 biochemistry pool (being anaerobic biofilter) is through anaerobic treatment the hardly degraded organic substance in the sewage to be carried out acidification hydrolization and methanation, improves biodegradability, reduces the running cost of WWT.3T-AF2 biochemistry pool (the oxygen biological filter of promptly holding concurrently) is the transition section of anaerobic and aerobic; Can be in normal course of operation according to the variation of time water quantity and quality; Regulate the aeration rate of every grade of double oxygen biological filter,, guarantee the optimum handling effect of system to adapt to the needs that different quality changes.The water outlet of 3T-AF2 biochemistry pool is passed through aerobic treatment with the organism in the degradation of sewage from flowing into 3T-BAF biochemistry pool (being aerobic biofilter) at this.
Water outlet through after the biochemical treatment system processing gets into Powdered Activated Carbon adsorption tank, coagulation reaction tank, coagulative precipitation tank, filtration priming reservoir, and through filtering adsorption tanks, qualified water is input to reuse pool, reuse then behind disinfection apparatus then; And defective water is input to defective water discharging pond.
Design quality of reused water standard confirms that according to the index in " recommending reuse to make the water quality standard (trying) of circulating cooling system make up water in China PetroChemical Corporation and the stock company's service water management system " concrete water quality sees the following form 1.
Table 1 quality of reused water standard
| The water quality project | Unit | Reused sewage water quality |
| COD cr | mg/L | ≤50.0 |
| BOD 5 | mg/L | ≤10.0 |
| Petroleum-type | mg/L | ≤5.0 |
| Ammonia nitrogen | mg/L | ≤5.0 |
| Suspended substance | mg/L | ≤5.0 |
| Sulfide | mg/L | ≤0.10 |
| Phenol | mg/L | ≤1.0 |
| The pH value | 6.5～9.0 | |
| Cl ions | mg/L | ≤250 |
| Sulfate ion | mg/L | ≤300 |
| Total hardness is (with CaCO 3Meter) | mg/L | 50～300 |
| Total alkalinity is (with CaCO 3Meter) | mg/L | 50～300 |
| Turbidity | NTU | ≤5.0 |
Because the sewage water yield of DCL/Direct coal liquefaction device discharging is big, concentration is high, complicated component; And original biochemical treatment system does not reach the last effect of expection, because this biochemical treatment system impact resistance is poor, the COD degradation rate is low; The nitrification and denitrification reaction is difficult to set up, and ammonia nitrogen can not get removing.Therefore, still need improve existing DCL/Direct coal liquefaction high-concentration sewage treatment system.
Summary of the invention
An object of the present invention is to provide a kind of DCL/Direct coal liquefaction high-concentration sewage treatment system.
Another object of the present invention provides a kind of DCL/Direct coal liquefaction process for treating high-concentration sewage.
DCL/Direct coal liquefaction high-concentration sewage treatment system provided by the invention, it comprises air flotation turbo, priming reservoir, the even matter jar that links to each other successively; The anaerobic biological pond, facultative anaerobic biochemical pond, aerobic biochemical pond, charcoal absorption pond, coagulation reaction tank, coagulative precipitation tank, filtration priming reservoir and the Filtration Adsorption jar that link to each other successively; Wherein, between said even matter jar and anaerobic biological pond, be provided with acidulated pool, and said even matter jar, acidulated pool link to each other successively with the anaerobic biological pond; Between outlet of said anaerobic biological pond and facultative anaerobic biochemical pond inlet, be provided with acidizing device; Between outlet of said facultative anaerobic biochemical pond and aerobic biochemistry pool inlet, be provided with the alkalization device.
Acid in the said acidulated pool can be sulfuric acid and/or hydrochloric acid.Acid in the said acidizing device can be sulfuric acid and/or hydrochloric acid.Alkali in the said alkalization device can be yellow soda ash and/or sodium hydroxide.
Said acidizing device can be to add sour pump.Said alkalization device can be to add alkali pump.
Be filled with microbe carrier in said anaerobic biological pond, facultative anaerobic biochemical pond and the aerobic biochemistry pool respectively and inoculate mikrobe is arranged; Said charcoal absorption pond comprises joins charcoal pond, mixing pit and adsorption tank.
Preferably, the alkali in the said alkalization device is that weight ratio is 100: 1 yellow soda ash and a sodium hydroxide.
DCL/Direct coal liquefaction process for treating high-concentration sewage provided by the invention may further comprise the steps:
(1) the DCL/Direct coal liquefaction high-concentration sewage is handled in air flotation turbo, priming reservoir, even matter jar successively, carried out acidifying then;
(2) sewage of above-mentioned acidification being crossed imports in the anaerobic biological pond to be handled;
(3) handle importing in the facultative anaerobic biochemical pond after the sewage acidifying of handling in the above-mentioned anaerobic biological pond;
(4) with handling in the sewage alkalization back importing aerobic biochemical pond of handling in the above-mentioned facultative anaerobic biochemical pond;
(5) sewage of handling in the above-mentioned aerobic biochemical pond is handled in charcoal absorption pond, coagulation reaction tank, coagulative precipitation tank, filtration priming reservoir and Filtration Adsorption jar successively.
In the said step (1), said acidifying is that the pH value with sewage is adjusted to 5.5～6.5.In the said step (3), said acidifying is that the pH value with sewage is adjusted to 6.5～7.5.In the said step (4), said alkalization is that the pH value with sewage is adjusted to 7.5～8.5.
In the said step (1), the acid that said acidifying is used is sulfuric acid and/or hydrochloric acid.In the said step (3), the acid that said acidifying is used is sulfuric acid and/or hydrochloric acid.In the said step (4), the alkali that said alkalization is used is yellow soda ash and/or sodium hydroxide; Preferably, the weight ratio of yellow soda ash and sodium hydroxide is 100: 1.
DCL/Direct coal liquefaction process for treating high-concentration sewage of the present invention further comprises: the gasification cyanide wastewater that in said DCL/Direct coal liquefaction high-concentration sewage, adds volumn concentration height to 40%; Preferably, add the gasification cyanide wastewater of volumn concentration height to 20%.
The DCL/Direct coal liquefaction high-concentration sewage through DCL/Direct coal liquefaction high-concentration sewage treatment system of the present invention and treatment process after, obviously improved the treatment effect of DCL/Direct coal liquefaction high-concentration sewage, but all up to standard and reuses of product water.
Description of drawings
Fig. 1 is the structure iron of existing DCL/Direct coal liquefaction high-concentration sewage treatment system.
Fig. 2 is the structure iron of DCL/Direct coal liquefaction high-concentration sewage treatment system of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is carried out more detailed description.
Fig. 2 is the structure iron of DCL/Direct coal liquefaction high-concentration sewage treatment system of the present invention.As shown in Figure 2, DCL/Direct coal liquefaction high-concentration sewage treatment system of the present invention comprises air flotation turbo, priming reservoir, the even matter jar that links to each other successively; The anaerobic biological pond, facultative anaerobic biochemical pond, aerobic biochemical pond, charcoal absorption pond, coagulation reaction tank, coagulative precipitation tank, filtration priming reservoir and the Filtration Adsorption jar that link to each other successively; Wherein, between said even matter jar and anaerobic biological pond, be provided with acidulated pool, and said even matter jar, acidulated pool link to each other successively with the anaerobic biological pond; Between outlet of said anaerobic biological pond and facultative anaerobic biochemical pond inlet, be provided with acidizing device; And between outlet of said facultative anaerobic biochemical pond and aerobic biochemistry pool inlet, be provided with the alkalization device.
Acid in the said acidulated pool can be sulfuric acid and/or hydrochloric acid.Said acidulated pool will be adjusted to 5.5～6.5 from the pH value of the sewage (the pH value is more than 8) of sparing the matter jar, and this sewage gets in anaerobic biological pond then.Thus, in anaerobic biological pond subsequently, the acidication bacterium in the anaerobic reaction is to have better reactive behavior under 5.5～6.5 the condition in the pH value.
Acid in the said acidizing device can be sulfuric acid and/or hydrochloric acid.Said acidizing device can be to add sour pump.Said acidizing device has no particular limits, as long as it can reach the acidifying purpose; For example, also can use acidulated pool.Said acidizing device is that the pH value from the sewage (the pH value is about 8) in anaerobic biological pond is adjusted to 6.5～7.5, and this sewage gets in facultative anaerobic biochemical pond then.In facultative anaerobic biochemical pond subsequently, the pH value is 6.5～7.5 more help the holding concurrently breeding of oxygen animalcule and the abilities of decomposing sewage.
Alkali in the said alkalization device can be yellow soda ash and/or sodium hydroxide.Said alkalization device can be to add alkali pump.Said alkalization device has no particular limits, as long as it can reach the purpose of alkalization; For example, also can use acidulated pool.In actual use, for ease, said alkali can be prepared the alkaligenous aqueous solution and use, and its concentration is had no particular limits.Said alkalization device is that the pH value from the sewage (the pH value is about 7) in facultative anaerobic biochemical pond is adjusted to 7.5～8.5, and this sewage gets in aerobic biochemical pond then.In aerobic biochemical pond subsequently, the pH value is 7.5～8.5 more to help the carrying out of nitration reaction.Preferably, in the said alkalization device, the weight ratio of yellow soda ash and sodium hydroxide is 100: 1, and the sewage after alkalization under this proportioning can better carry out nitration reaction.
Said air flotation turbo can drop to the oleaginousness of DCL/Direct coal liquefaction high-concentration sewage below the 10mg/L, can remove part SS, volatile phenol and portion C OD simultaneously.
Said priming reservoir can be promoted to the sewage pressurization (for example, using pump) from air flotation turbo even matter jar.
From the sewage of priming reservoir with lift pump promote get into said even matter jar after, in this water quality, water yield homogenizing, guarantee the stable of follow-up biochemical treating water amount, water quality to sewage, avoid producing big impact, improve the rate that operates steadily.
Be filled with the polyurethane foam microbe carrier in the said anaerobic biological pond and inoculate anaerobion is arranged.The main effect in said anaerobic biological pond is through anaerobic treatment the hardly degraded organic substance in the sewage to be carried out acidification hydrolization and methanation, improves biodegradability, reduces the running cost of WWT.
Be filled with the polyurethane foam microbe carrier in the said facultative anaerobic biochemical pond and inoculate mikrobe is arranged; It is the transition section of anaerobic and aerobic; Can be in normal course of operation according to the variation of time water quantity and quality; Regulate the aeration rate in every grade in facultative anaerobic biochemical pond,, guarantee the optimum handling effect of system to adapt to the needs that different quality changes.
Being filled with microbe carrier (for example, can be sponge) in the said aerobic biochemical pond and inoculating has mikrobe, passes through aerobic treatment with the organism in the degradation of sewage at this.
In the said charcoal absorption pond, at first Powdered Activated Carbon is made into suspension-s with water in joining the charcoal pond, squeezes into mixing pit and aerobic biochemical pond processing back water outlet thorough mixing, get into adsorption tank through pump; In adsorption tank, sewage fully contacts with Powdered Activated Carbon then, and the COD in the waste water and other pollutent are by charcoal absorption.
In the said coagulation reaction tank, the sewage entering coagulation reaction tank from said charcoal absorption pond adds Poly aluminum Chloride (PAC) (PAC) and cationic polyacrylamide (PAM), thorough mixing, reaction then in coagulation reaction tank.
In the said coagulative precipitation tank, will carry out mud-water separation through precipitation process, remove the COD that most suspended substances and a small amount of microbiological treatment fail to remove, to improve the water outlet effect from the sewage of said coagulation reaction tank.
Said filtration priming reservoir, it has lift pump can the sewage from coagulative precipitation tank be promoted to the Filtration Adsorption jar.
Said Filtration Adsorption jar has more medium filter and biologic active carbon filtration device, through filtering and adsorption process, removes suspended substance and organism.Pneumatic butterfly valve is adopted in this equipment pipeline medium control, on-the-spot PLC control.Can realize automatic backwash through setting inlet outlet pressure differential or time cycle.
DCL/Direct coal liquefaction process for treating high-concentration sewage of the present invention may further comprise the steps:
(1) the DCL/Direct coal liquefaction high-concentration sewage is handled in air flotation turbo, priming reservoir, even matter jar successively, carried out acidification then;
(2) sewage of above-mentioned acidification being crossed imports in the anaerobic biological pond to be handled;
(3) handle importing in the facultative anaerobic biochemical pond after the sewage acidifying of handling in the above-mentioned anaerobic biological pond;
(4) with handling in the sewage alkalization back importing aerobic biochemical pond of handling in the above-mentioned facultative anaerobic biochemical pond;
(5) sewage of handling in the above-mentioned aerobic biochemical pond is handled in charcoal absorption pond, coagulation reaction tank, coagulative precipitation tank, filtration priming reservoir and Filtration Adsorption jar successively.
In the said step (1): said acidifying is that the pH value with sewage is adjusted to 5.5～6.5.The acid that said acidifying is used is sulfuric acid and/or hydrochloric acid.
In the said step (3): said acidifying is that the pH value with sewage is adjusted to 6.5～7.5.The acid that said acidifying is used is sulfuric acid and/or hydrochloric acid.
In the said step (4): said alkalization is that the pH value with sewage is adjusted to 7.5～8.5.The alkali that said alkalization is used is yellow soda ash and/or sodium hydroxide; Preferably, the weight ratio of yellow soda ash and sodium hydroxide is 100: 1.
Particularly, DCL/Direct coal liquefaction process for treating high-concentration sewage of the present invention may further comprise the steps:
Make DCL/Direct coal liquefaction high-concentration sewage pressurization get into air flotation turbo, add Poly aluminum Chloride (PAC) and SEPIGEL 305 and make it and sewage fully reacts, get into the processing of dissolved air flotation section then at feed-water end;
Make said air flotation turbo water outlet get into the priming reservoir, through pressurization sewage is promoted to said even matter jar then;
The sewage that gets into said even matter jar is stayed for some time at this;
Sewage in the said even matter jar is imported in the acidulated pool, the pH value is adjusted to 5.5～6.5 through acidifying;
Sewage in the said acidulated pool is imported in the anaerobic biological pond, carry out anaerobic treatment through mikrobe;
To through acidifying the pH value be adjusted to 6.5～7.5 from the sewage in anaerobic biological pond;
Sewage after the above-mentioned acidifying is imported in the facultative anaerobic biochemical pond, through the mikrobe oxygen processing of holding concurrently;
To through alkalization the pH value be adjusted to 7.5～8.5 from the sewage in facultative anaerobic biochemical pond;
Sewage after the above-mentioned alkalization is imported in the aerobic biochemical pond, carry out aerobic treatment through mikrobe;
To import the charcoal absorption pond from the sewage in said aerobic biochemical pond, and contact with gac suspension-s then and carry out adsorption treatment;
To import coagulation reaction tank from the sewage in said charcoal absorption pond, add Poly aluminum Chloride (PAC) then and cationic polyacrylamide is handled;
To import coagulative precipitation tank from the sewage of said coagulation reaction tank, carry out the mud-water separation processing through leaving standstill at this;
To import from the sewage of said coagulative precipitation tank and filter the priming reservoir;
To import the Filtration Adsorption jar from the sewage of said filtration priming reservoir, filter and adsorption treatment through multi-medium filtering and biologic active carbon filtration device at this.
More specifically, DCL/Direct coal liquefaction process for treating high-concentration sewage provided by the invention may further comprise the steps:
DCL/Direct coal liquefaction high-concentration sewage pressurization is got into air flotation turbo, add 50～100mg/L Poly aluminum Chloride (PAC) (PAC) and 30～80mg/L SEPIGEL 305 (PAM) and make it and sewage fully reacts, get into the processing of dissolved air flotation section then at feed-water end; The dissolved air flotation section is provided with the chain scraping machine, strikes off surface scum.More specifically; Can for: DCL/Direct coal liquefaction high-concentration sewage (oleaginousness is not more than 100mg/L) pressurization is got into air flotation turbo; Add 50～100mg/L Poly aluminum Chloride (PAC) (PAC) and 30～80mg/L SEPIGEL 305 (PAM) and make it and sewage fully reacts at feed-water end, get into the dissolved air flotation section then and handle.In the dissolved air flotation section, microbubble absorption oil droplet holds up oil droplet, reaches the purpose of oily water separation.The dissolved air flotation section is provided with the chain scraping machine, strikes off surface scum, and oleaginousness is less than 10mg/L (containing oil in water emulsion) in the design water outlet.Adopt air flotation turbo (air-dissolving air-float reservation) to handle oleaginousness is dropped to below the 10mg/L, remove part SS, volatile phenol and portion C OD simultaneously.The water outlet oleaginousness of handling through air flotation turbo less than total clearance of 10mg/L, COD about 10%.
Said air flotation turbo water outlet is promoted to said even matter jar through pump with sewage then from flowing into the biochemical priming reservoir of high-concentration sewage.
The sewage that gets into said even matter jar stops about 20～30 hours (depending on the first phase water yield) at this.This processing process is guarantee follow-up biochemical treating water amount, water quality stable, prevents to produce big impact.
To be in the sewage importing acidulated pool more than 8 from the pH value of said even matter jar, and add hydrochloric acid and/or sulfuric acid then the pH value is adjusted to 5.5～6.5.
Sewage after the above-mentioned acidifying is imported in the said anaerobic biological pond, and said anaerobic biological pond is divided into the operation of many group plural parallel stages, and hydraulic detention time is 30～40 hours; Water inlet upper water-out overflow mode step by step water distribution is installed 3 layers of carrier brackets under every grade of employing in the pond, and 2 layers of suspending carriers of filling also are loaded with mikrobe, and carrier effectively contacts certain hour.More specifically, can for: said anaerobic biological pond is divided into eight groups of Pyatyi parallel runnings, and hydraulic detention time is 33.33 hours; Every grade of employing is water inlet upper water-out overflow mode step by step water distribution down, and 3 layers of carrier brackets are installed in the pond in, loads efficiently suspend 2 layers of dedicated carriers and be loaded with mikrobe (for example, can be wheel animalcule) of polyurethane foam, and carrier effectively contacts 21.33 hours.The bottom is provided with aeration tube and shore pipe.
PH value from the anaerobic biological pond is about 8 sewage through adding sour pump and add hydrochloric acid and/or sulfuric acid being adjusted to 6.5～7.5 with the pH value.
Sewage after the above-mentioned acidifying is imported in the said facultative anaerobic biochemical pond.Said facultative anaerobic biochemical pond is divided into the operation of many group plural parallel stages, and every grade of employing overflow mode step by step of water inlet upper water-out is down arranged.3 layers of carrier brackets are installed in the pond, and 2 layers of suspending carriers also are loaded with mikrobe, and carrier effectively contacts certain hour.The bottom in said facultative anaerobic biochemical pond is provided with aeration tube and is used for stirring and back flushing, and the bottom is provided with shore pipe.More specifically, can for: said facultative anaerobic biochemical pond is divided into eight groups of Pyatyi parallel runnings, and every grade of employing overflow mode step by step of water inlet upper water-out is down arranged.3 layers of carrier brackets are installed in the pond, and special efficient suspension dedicated carrier 2 layers (for example, can be sponges) also is loaded with mikrobe (for example, can be lamblia), and carrier effectively contacts 20.67 hours.The bottom in said facultative anaerobic biochemical pond is provided with aeration tube and is used for stirring and back flushing, and moving GWR at ordinary times is 20: 1, and the bottom is provided with shore pipe.The water outlet of aerobic biochemical pond can be back to the facultative anaerobic biochemical pond, utilizes the carbon source in the water inlet to carry out denitrification, is the nitrated basicity that provides of back segment ammonia nitrogen simultaneously, reduces to add alkali number, reduces running cost, can also prevent that anaerobism from producing hydrogen sulfide.Establish 4 groups of dissolved oxygens (DO) in-line meter in the said facultative anaerobic biochemical pond, control DO＜1mg/l is to guarantee treatment effect.
PH value from the facultative anaerobic biochemical pond is about 7 sewage through adding alkali pump and add yellow soda ash and/or sodium hydroxide being adjusted to 7.5～8.5 with the pH value.
Sewage after the above-mentioned alkalization is imported in the said aerobic biochemical pond.Feed-water end in said aerobic biochemical pond adds nitrification liquid.Said aerobic biochemical pond is the operation of many group plural parallel stages, water inlet upper water-out overflow mode step by step water distribution under every grade of employing.3 layers of carrier brackets are installed in the pond, and 2 layers of suspending carriers of filling also are loaded with mikrobe, and carrier effectively contacts certain hour.Bottom, said aerobic biochemical pond is installed aerating system and shore pipe is set.More specifically, can for: the feed-water end in said aerobic biochemical pond adds the nitrification liquid sodium carbonate solution, and dosage is by 3～5L/m
3The water design.Said aerobic biochemical pond is eight groups of Pyatyi parallel runnings, water inlet upper water-out overflow mode step by step water distribution under every grade of employing.3 layers of carrier brackets are installed in the pond, are loaded efficient suspension dedicated carrier urethane carrier, 2 layers and be loaded with mikrobe (for example, can be nematode), carrier effectively contacts 20.0 hours.Bottom, said aerobic biochemical pond is installed the 3T-ADS aerating system and is used for aeration, and GWR is 40: 1, and the bottom is provided with shore pipe.The pond water outlet of said aerobic biochemical through pump promote be back to said facultative anaerobic biochemical pond before, the dilution water source as debugging and influent quality when higher.Backflow ratio 1: 1.Establish 4 groups of dissolved oxygens (DO) in-line meter in the said aerobic biochemical pond, DO is at 2～4mg/L in control, with the effect that guarantees that aerobe is handled.The froth breaking facility is set, to avoid producing too much foam in the aeration tank in the pond;
Make sewage get into mixing pit from said aerobic biochemical pond.Powdered Activated Carbon is made into suspension-s with water earlier in joining the charcoal pond, squeeze into mixing pit and aerobic biochemical pond processing back water outlet thorough mixing through pump, gets into adsorption tank.In adsorption tank, sewage fully contacts with Powdered Activated Carbon then, and the COD in the waste water and other pollutent are by charcoal absorption.
Make sewage get into coagulation reaction tank, in coagulation reaction tank, add 50～100mg/L Poly aluminum Chloride (PAC) (PAC) and 30～80mg/L cationic polyacrylamide (PAM), thorough mixing, reaction then from said charcoal absorption pond.
To get into coagulative precipitation tank from the sewage of said coagulation reaction tank and carry out mud-water separation.Remove the COD that most suspended substances and a small amount of microbiological treatment fail to remove thus, to improve the water outlet effect.
To get into from the sewage of said coagulative precipitation tank and filter the priming reservoir, can the sewage of said coagulative precipitation tank be promoted to the Filtration Adsorption jar through lift pump.
Make sewage get into said Filtration Adsorption jar,, remove the organism of suspended substance and part difficult degradation through the filtration and the adsorption process of more medium filter and biological activity carbon filter from said filtration priming reservoir.Pneumatic butterfly valve is adopted in this equipment pipeline medium control, on-the-spot PLC control.Can realize automatic backwash through setting inlet outlet pressure differential or time cycle.
Further, it is high to 40% gasification cyanide wastewater in said DCL/Direct coal liquefaction high-concentration sewage, to add volumn concentration (based on total sewage volume); Preferably, it is high to 20% gasification cyanide wastewater to add volumn concentration (based on total sewage volume).
The composition of said gasification cyanide wastewater is seen table 2:
The composition (index unit is mg/L) of table 2 gasification cyanide wastewater
Following embodiment only is used to the present invention that explains, and unrestricted the present invention.
Embodiment 1
Handled DCL/Direct coal liquefaction high-concentration sewage is from devices such as the gelatin liquefaction of Erdos coal system oil content company of group of Shenhua, hydro-upgradings; Its composition is seen table 3.
The composition of table 3 DCL/Direct coal liquefaction high-concentration sewage (mg/L of unit)
Said gasification cyanide wastewater is from the coal device for producing hydrogen; Its composition is seen table 2.Air flotation turbo is by the production of wheat princes and dukes department.
The DCL/Direct coal liquefaction high-concentration sewage is got into air flotation turbo through pump pressurization, add Poly aluminum Chloride (PAC) (PAC) and the 60mg/L SEPIGEL 305 (PAM) of 100mg/L amount and make it and sewage fully reacts, get into the processing of dissolved air flotation section then at feed-water end.In the dissolved air flotation section, microbubble absorption oil droplet holds up oil droplet, reaches the purpose of oily water separation.The dissolved air flotation section is provided with the chain scraping machine, strikes off surface scum, and oleaginousness is less than 10mg/L (containing oil in water emulsion) in the design water outlet.Adopt air flotation turbo (air-dissolving air-float reservation) to handle oleaginousness is dropped to below the 10mg/L, remove part SS, volatile phenol and portion C OD simultaneously.The water outlet oleaginousness of handling through air flotation turbo less than total clearance of 10mg/L, COD about 10%.
Said air flotation turbo water outlet is promoted to 5000m through the pump pressurization with sewage then from flowing into the biochemical priming reservoir of high-concentration sewage
3In the even matter jar.
Sewage through the said even matter jar of pump pressurization lifting entering was stopped about 20 hours at this.
To import from the sewage of said even matter jar in the acidulated pool, through adding sulfuric acid the pH value will be adjusted to 5.5 then.
Water in the acidulated pool is imported in the anaerobic biological pond, and said anaerobic biological pond is divided into eight groups of Pyatyi parallel runnings, and hydraulic detention time is 33.33 hours; Water inlet upper water-out overflow mode step by step water distribution is installed 3 layers of carrier brackets under every grade of employing in the pond, loads 2 layers in efficient suspension dedicated carrier sponge, and the carrier loadings is 2400m
3, adding efficient special-purpose anaerobion wheel animalcule 1920kg, carrier effectively contacts 21.33 hours.The bottom is provided with aeration tube, (water yield 90m when normal operation
3/ hour), the methane gas generation is 172Nm
3/ hour.Chi Ding is provided with airtight coagulation earth mulch, sends into biogas treatment facility burning disposal after methane gas is collected.For avoiding forming explosion gas after methane and the air mixed, when operation operation forbidden aeration at ordinary times.The bottom is provided with shore pipe and is used for spoil disposal and emptying.For guaranteeing the minimum surface load of anaerobic pond, prevent sludgd deposition, the anaerobic pond water outlet is through the anaerobism reflux pump) reflux, reflux ratio was by design in 2: 1, and hydraulic surface loading is 10.8m
3/ m
2D (containing backflow).
Sewage from the anaerobic biological pond is adjusted to 6.5 through adding sour pump interpolation sulfuric acid with the pH value;
Water after the above-mentioned acidifying is imported in the facultative anaerobic biochemical pond.Said facultative anaerobic biochemical pond is divided into eight groups of Pyatyi parallel runnings, and the overflow mode step by step of the every grade of following water inlet of employing upper water-out is arranged.3 layers of carrier brackets are installed in the pond, 2 layers in special efficient suspension dedicated carrier sponge, the carrier loadings is 2480m
3, adding the efficient special use oxygen animalcule lamblia 1984kg that holds concurrently, carrier effective duration of contact is 20.67 hours.The bottom in said facultative anaerobic biochemical pond is provided with aeration tube and is used for stirring and back flushing, and moving GWR at ordinary times is 20: 1, and the bottom is provided with shore pipe.In addition, the water outlet of aerobic biochemical pond can be back to the facultative anaerobic biochemical pond, utilizes the carbon source in the water inlet to carry out denitrification, is the nitrated basicity that provides of back segment ammonia nitrogen simultaneously, reduces to add alkali number, reduces running cost, can also prevent that anaerobism from producing hydrogen sulfide.Establish 4 groups of dissolved oxygens (DO) in-line meter in the said facultative anaerobic biochemical pond, control DO＜1mg/l is to guarantee treatment effect.
Sewage from the facultative anaerobic biochemical pond is adjusted to 8.5 through adding alkali pump interpolation yellow soda ash with the pH value;
Water after the above-mentioned alkalization is imported in the aerobic biochemical pond.Feed-water end in said aerobic biochemical pond adds the nitrification liquid sodium carbonate solution, and dosage is by 3～5L/m
3The water design.Said aerobic biochemical pond is eight groups of Pyatyi parallel runnings, water inlet upper water-out overflow mode step by step water distribution under every grade of employing.3 layers of carrier brackets are installed in the pond, are loaded 2 layers in efficient suspension dedicated carrier sponge, the carrier loadings is 2550m
3, adding efficient special-purpose aerobic microbiological nematode 2040kg, carrier effective duration of contact is 20.0 hours.Bottom, said aerobic biochemical pond is installed the 3T-ADS aerating system and is used for aeration, and GWR is 40: 1, and the bottom is provided with shore pipe.The pond water outlet of said aerobic biochemical through pump promote be back to said facultative anaerobic biochemical pond before, the dilution water source as debugging and influent quality when higher.Backflow ratio 1: 1.Establish 4 groups of dissolved oxygens (DO) in-line meter in the said aerobic biochemical pond, DO is at 2～4mg/L in control, with the effect that guarantees that aerobe is handled.The froth breaking facility is set, to avoid producing too much foam in the aeration tank in the pond;
Make sewage get into mixing pit from said aerobic biochemical pond.Powdered Activated Carbon is made into suspension-s with water earlier in joining the charcoal pond, squeeze into mixing pit and aerobic biochemical pond processing back water outlet thorough mixing through spiral pump, gets into adsorption tank.In adsorption tank, sewage fully contacts with Powdered Activated Carbon then, and the COD in the waste water and other pollutent are by charcoal absorption.
Get into coagulation reaction tank from the sewage in said charcoal absorption pond, in coagulation reaction tank, add Poly aluminum Chloride (PAC) (PAC) and 30mg/L cationic polyacrylamide (PAM), thorough mixing, the reaction of 50mg/L then.
To get into coagulative precipitation tank from the sewage of said coagulation reaction tank, carry out mud-water separation through leaving standstill.Remove the COD that most suspended substances and a small amount of microbiological treatment fail to remove thus, to improve the water outlet effect.
Make sewage get into the filtration priming reservoir, have lift pump can the sewage from coagulative precipitation tank be promoted to the Filtration Adsorption jar from said coagulative precipitation tank.
To get into the Filtration Adsorption jar from the sewage of said filtration priming reservoir, said Filtration Adsorption jar has more medium filter and biologic active carbon filtration device, through filtering and adsorption process, removes the organism of suspended substance and part difficult degradation.Pneumatic butterfly valve is adopted in this equipment pipeline medium control, on-the-spot PLC control.Can realize automatic backwash through setting inlet outlet pressure differential or time cycle.
Through above-mentioned processing, the water quality of final product water sees the following form 4.
The water quality of the product water of table 4 embodiment 1
| The water quality project | Unit | Product water water quality |
| COD cr | mg/L | ≤50.0 |
| BOD 5 | mg/L | ≤10.0 |
| Petroleum-type | mg/L | ≤5.0 |
| Ammonia nitrogen | mg/L | ≤5.0 |
| Suspended substance | mg/L | ≤5.0 |
| Sulfide | mg/L | ≤0.10 |
| Phenol | mg/L | ≤1.0 |
| pH | mg/L | 6.5～9.0 |
| Cl ions | mg/L | ≤250 |
| Sulfate ion | mg/L | ≤300 |
| Total hardness is (with CaCO 3Meter) | mg/L | 50～300 |
| Total alkalinity is (with CaCO 3Meter) | mg/L | 50～300 |
| Turbidity | mg/L | ≤5.0 |
Can find out that by table 4 after DCL/Direct coal liquefaction high-concentration sewage process treatment system of the present invention and the treatment process, product water has reached the standard of reuse fully.
Embodiment 2
Except importing from the sewage of said even matter jar in the acidulated pool, through adding hydrochloric acid the pH value is adjusted to 6.5 then; Sewage from the anaerobic biological pond is adjusted to 7.5 through adding sour pump interpolation hydrochloric acid with the pH value; Sewage from the facultative anaerobic biochemical pond is adjusted to the pH value outside 7.5 through adding alkali pump interpolation yellow soda ash, adopts with embodiment 1 identical method and handle the DCL/Direct coal liquefaction high-concentration sewage.As a result, the product water that obtains has reached the standard of reuse fully.
Embodiment 3
Except importing from the sewage of said even matter jar in the acidulated pool, through adding hydrochloric acid and vitriolic mixture the pH value is adjusted to 6.0 then; Sewage from the anaerobic biological pond is adjusted to 7.0 through adding sour pump interpolation hydrochloric acid and vitriolic mixture with the pH value; Is that 100: 1 the yellow soda ash and the mixture of sodium hydroxide are adjusted to the pH value outside 8.0 with the sewage from the facultative anaerobic biochemical pond through adding alkali pump interpolation weight ratio, adopts with embodiment 1 identical method and handles the DCL/Direct coal liquefaction high-concentration sewage.As a result, the product water that obtains has reached the standard of reuse fully.
Embodiment 4
Except in the DCL/Direct coal liquefaction high-concentration sewage, adding the gasification cyanide wastewater, make its account for total sewage volume 40% outside, adopt the method processing DCL/Direct coal liquefaction high-concentration sewage identical with embodiment 1.As a result, the product water that obtains has reached the standard of reuse fully.
Embodiment 5
Except in the DCL/Direct coal liquefaction high-concentration sewage, adding the gasification cyanide wastewater, make its account for total sewage volume 20% outside, adopt the method processing DCL/Direct coal liquefaction high-concentration sewage identical with embodiment 1.As a result, the product water that obtains has reached the standard of reuse fully.
It will be understood by those skilled in the art that under the instruction of this specification sheets, can make some modifications or variation the present invention.These modifications and change also should be within claim of the present invention institute restricted portion.
Claims (10)
1. DCL/Direct coal liquefaction high-concentration sewage treatment system, it comprises air flotation turbo, priming reservoir, the even matter jar that links to each other successively; The anaerobic biological pond, facultative anaerobic biochemical pond, aerobic biochemical pond, charcoal absorption pond, coagulation reaction tank, coagulative precipitation tank, filtration priming reservoir and the Filtration Adsorption jar that link to each other successively; It is characterized in that, between said even matter jar and anaerobic biological pond, be provided with acidulated pool, and said even matter jar, acidulated pool link to each other with the anaerobic biological pond successively; Between outlet of said anaerobic biological pond and facultative anaerobic biochemical pond inlet, be provided with acidizing device; Between outlet of said facultative anaerobic biochemical pond and aerobic biochemistry pool inlet, be provided with the alkalization device.
2. DCL/Direct coal liquefaction high-concentration sewage treatment system according to claim 1 is characterized in that, the acid in the said acidulated pool is sulfuric acid and/or hydrochloric acid; Acid in the said acidizing device is sulfuric acid and/or hydrochloric acid; Alkali in the said alkalization device is yellow soda ash and/or sodium hydroxide.
3. DCL/Direct coal liquefaction high-concentration sewage treatment system according to claim 1 and 2 is characterized in that, said acidizing device is to add sour pump; Said alkalization device is to add alkali pump.
4. according to claim 2 or 3 described DCL/Direct coal liquefaction high-concentration sewage treatment systems, it is characterized in that being filled with microbe carrier in said anaerobic biological pond, facultative anaerobic biochemical pond and the aerobic biochemistry pool respectively and inoculating has mikrobe; Said charcoal absorption pond comprises joins charcoal pond, mixing pit and adsorption tank.
5. according to each described DCL/Direct coal liquefaction high-concentration sewage treatment system of claim 1～4, it is characterized in that the alkali in the said alkalization device is that weight ratio is 100: 1 yellow soda ash and a sodium hydroxide.
6. DCL/Direct coal liquefaction process for treating high-concentration sewage may further comprise the steps:
(1) the DCL/Direct coal liquefaction high-concentration sewage is handled in air flotation turbo, priming reservoir, even matter jar successively, carried out acidification then;
(2) sewage of above-mentioned acidification being crossed imports in the anaerobic biological pond to be handled;
(3) handle importing in the facultative anaerobic biochemical pond after the sewage acidifying of handling in the above-mentioned anaerobic biological pond;
(4) with handling in the sewage alkalization back importing aerobic biochemical pond of handling in the above-mentioned facultative anaerobic biochemical pond;
(5) sewage of handling in the above-mentioned aerobic biochemical pond is handled in charcoal absorption pond, coagulation reaction tank, coagulative precipitation tank, filtration priming reservoir and Filtration Adsorption jar successively.
7. DCL/Direct coal liquefaction process for treating high-concentration sewage according to claim 6 is characterized in that, in the step (1), said acidifying is that the pH value with sewage is adjusted to 5.5～6.5; In the step (3), said acidifying is that the pH value with sewage is adjusted to 6.5～7.5; In the step (4), said alkalization is that the pH value with sewage is adjusted to 7.5～8.5.
8. according to claim 6 or 7 described DCL/Direct coal liquefaction process for treating high-concentration sewage, it is characterized in that in the step (1), the acid that said acidifying is used is sulfuric acid and/or hydrochloric acid; In the step (3), the acid that said acidifying is used is sulfuric acid and/or hydrochloric acid; In the step (4), the alkali that said alkalization is used is yellow soda ash and/or sodium hydroxide; Preferably, the weight ratio of yellow soda ash and sodium hydroxide is 100: 1.
9. according to each described DCL/Direct coal liquefaction process for treating high-concentration sewage of claim 6～8, it is characterized in that, be specially:
Make DCL/Direct coal liquefaction high-concentration sewage pressurization get into air flotation turbo, add Poly aluminum Chloride (PAC) and SEPIGEL 305 and make it and sewage fully reacts, get into the processing of dissolved air flotation section then at feed-water end;
Make said air flotation turbo water outlet get into the priming reservoir, through pressurization sewage is promoted to said even matter jar then;
The sewage that gets into said even matter jar is stayed for some time at this;
Sewage in the said even matter jar is imported in the acidulated pool, the pH value is adjusted to 5.5～6.5 through acidifying;
Sewage in the said acidulated pool is imported in the anaerobic biological pond, carry out anaerobic treatment through mikrobe;
To through acidifying the pH value be adjusted to 6.5～7.5 from the sewage in said anaerobic biological pond;
Sewage after the above-mentioned acidifying is imported in the facultative anaerobic biochemical pond, through the mikrobe oxygen processing of holding concurrently;
To through alkalization the pH value be adjusted to 7.5～8.5 from the sewage in said facultative anaerobic biochemical pond;
Sewage after the above-mentioned alkalization is imported in the aerobic biochemical pond, carry out aerobic treatment through mikrobe;
To import the charcoal absorption pond from the sewage in said aerobic biochemical pond, and contact with gac suspension-s then and carry out adsorption treatment;
To import coagulation reaction tank from the sewage in said charcoal absorption pond, add Poly aluminum Chloride (PAC) then and cationic polyacrylamide is handled;
To import coagulative precipitation tank from the sewage of said coagulation reaction tank, carry out the mud-water separation processing through leaving standstill at this;
To import from the sewage of said coagulative precipitation tank and filter the priming reservoir;
To import the Filtration Adsorption jar from the sewage of said filtration priming reservoir, filter and adsorption treatment through multi-medium filtering and biologic active carbon filtration device at this.
10. according to each described DCL/Direct coal liquefaction process for treating high-concentration sewage of claim 6～9, it is characterized in that, further comprise: the gasification cyanide wastewater that in said DCL/Direct coal liquefaction high-concentration sewage, adds volumn concentration height to 40%; Preferably, add the gasification cyanide wastewater of volumn concentration height to 20%.
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| CN202430088U (en) * | 2011-11-23 | 2012-09-12 | 神华集团有限责任公司 | High-concentration sewage treatment system for coal direct liquefaction |
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| 范树军: "煤液化高浓度污水生化处理工程技术研究", 《工程建设》 * |
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