CN103288299A - Biochemical treatment method of coal chemical industry wastewater - Google Patents
Biochemical treatment method of coal chemical industry wastewater Download PDFInfo
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Abstract
The invention relates to a biochemical treatment method of coal chemical industry wastewater, and the biochemical treatment method generally adopts an anoxic-aerobic treatment process and is limited in degradation capacity. The biochemical treatment method comprises the following steps of: pretreatment, anaerobic treatment, first-stage aerobic treatment, anoxic treatment, second-stage aerobic treatment, coagulating sedimentation and sand filtering. After all steps are executed, the COD (Chemical Oxygen Demand) of the water quality of effluent water is less than or equal to 100 mg/L, the BOD is less than or equal to 30 mg/L, sulfides are less than or equal to 1 mg/L, prussiate is less than or equal to 0.5 mg/L, suspended materials are less than or equal to 70 mg/L, unit phenol concentration is 50-200 mg/L, and ammonia nitrogen concentration is 100-250 mg/L. The invention aims at providing the biochemical treatment method of the coal chemical industry wastewater.
Description
technical field:
the present invention relates to a kind of biochemical processing method of coal chemical industrial waste water, belong to coal chemical technology, particularly lurgi gasifier gasification waste water and Technologies of Coke Plant Wastewater Treatment field, especially be applicable to adopting coal methyl alcohol processed, the coal liquefaction of lurgi gasifier gasifying process, the wastewater treatment of coal preparing natural gas generation
background technology:
coal chemical industrial waste water is the waste water produced in coal gasification, destructive distillation, purification and Chemicals building-up process, the Pollutant levels degree is high, complicated component, except containing the inorganic pollution beyond the region of objective existences such as ammonia, cyanogen, thiocyanate, also contain heterocycle and the polycyclc aromatic compounds (PAHs) such as phenols, naphthalene, pyridine, quinoline, anthracene, it is a kind of trade effluent of administering that is difficult to most, intractability is large, and processing cost is high.The widespread use in coal methyl alcohol processed, coal liquefaction, coal preparing natural gas project of lurgi gasifier gasifying process, wastewater treatment has become the principal element of its development of restriction.
by the variation of the form of processing mode and pollutent, coal chemical industry wastewater treating method can be divided into Physical, chemical method and biochemical process, and industrial generally the employing be take the combined technical method that biochemical treatment is core.Biochemical processing method generally adopts the anaerobic-aerobic treatment process, but limited to the degradation capability of polycyclic aromatic hydrocarbons in waste water and heterocyclic arene, water outlet be difficult to qualified discharge.
summary of the invention:
the object of the invention is to develop a kind of efficient, economic coal chemical industry wastewater treating method, solves existing coal chemical industrial waste water, particularly lurgi gasifier gasification waste water and coking waste water treatment process, and running cost is high, intractability is large, the unsettled shortcoming of effluent quality.The present invention also is applicable to other relevant industry and sanitary wastewater processing technology field.
the object of the present invention is achieved like this:
a kind of biochemical processing method of wastewater from chemical industry, the method step comprises: pre-treatment, anaerobic treatment, one-level aerobic treatment, anaerobic treatment, secondary aerobic treatment, coagulating sedimentation, sand filtration, effluent quality COD≤100mg/L after processing, BOD5≤30mg/L, sulfide≤1mg/L, prussiate≤0.5mg/L, suspended substance≤70mg/L, water-quality guideline is: COD concentration 1500-3500mg/L, total phenol concentration 300-700mg/L, unit phenol concentration 50-200mg/L, ammonia nitrogen concentration 100-250mg/L, pH value 6.0-8.0.
the biochemical processing method of described coal chemical industrial waste water, described pre-treatment is that at first the high-concentration phenolic wastewater that gasification, destructive distillation produce is precipitated the pre-treatment such as oil removing, ammonia still process, dephenolize; Described anaerobic treatment is that pretreated phenol water is entered to anaerobic treatment workshop section, introduce the residue wastewater that chemosynthesis workshop section produces simultaneously, regulate the COD total amount ratio 0.2-0.5 of synthetic raffinate COD total amount and phenol water, add suitable micronutrient element, control temperature 36-38 ℃, pH value 7-7.5, residence time 20-30 hour, COD decreasing ratio 20-40%, total phenol removal rate 13-46%, total ammonia removal rate 18-25%.
the biochemical processing method of described coal chemical industrial waste water, described one-level aerobic treatment is that the waste water after anaerobic treatment is entered to one-level aerobic treatment workshop section, control temperature 28-35 ℃, pH value 6.5-8.5, DO value 0.5-4mg/L, residence time 20-30 hour, COD decreasing ratio 80-95%, total phenol removal rate 60-80%, total ammonia removal rate 40-70%; Described secondary lacks/and aerobic treatment is that the waste water after aerobic treatment is carried out to secondary anoxic/aerobic treatment again, flow into successively anoxic section and aerobic section, anoxic section DO value 0-0.5mg/L, aerobic section DO value 0.5-5mg/L, the anoxic section is added residue wastewater that synthesizing section produces or methyl alcohol as organic carbon source, the BOD5:TN>=4-6 of anaerobic treatment pond solution; Control temperature 28-35 ℃, pH value 6.5-8.5, residence time 10-15 hour, secondary aerobic treatment pond BOD5≤20mg/L, be beneficial to the nitrifier increment, controls temperature 28-35 ℃, pH value 6.5-8.5, residence time 10-15 hour, COD decreasing ratio 30-40%, total phenol removal rate 40-60%, total ammonia removal rate 50-70%, described anaerobic treatment section, adopt the gallery pulling flow type, biologic packing material is installed in anoxic pond, and packing volume accounts for the 5-10% of anoxic pond volume; Described secondary aerobic treatment section, adopt the gallery pulling flow type, head end water inlet or multipoint water feeding, and the aerobic section effluent recycling is to anoxic section, reflux ratio 1-1.5.
the biochemical processing method of described coal chemical industrial waste water, described coagulant precipitation is that the waste water after biochemical treatment is flowed into to coagulative precipitation tank, adds flocculation agent, carry out the coagulating sedimentation processing, residence time 4-8 hour, dosing mud in bottom is discharged system, with the excess sludge rear outward transport of together dewatering; Described sand filtration is that the water outlet after coagulating sedimentation is processed flows into sand filter, filters and removes mud impurity, effluent quality COD≤100mg/L, BOD5≤30mg/L, ammonia nitrogen concentration≤15mg/L, concentration of suspension≤70mg/L; Described coagulating sedimentation is processed flocculation agent used, can be ferric oxide, polymer alumina, iron aluminium composite flocculation agent, carboxymethyl cellulose, flocculation agent addition 0.01-0.1%.
the biochemical processing method of described coal chemical industrial waste water, described pretreated phenolic wastewater, water-quality guideline is: COD concentration 1500-3500mg/L, total phenol concentration 300-700mg/L, unit phenol concentration 50-200mg/L, ammonia nitrogen concentration 100-250mg/L, pH value 6.0-8.0.
the biochemical processing method of described coal chemical industrial waste water, the residue wastewater that described chemosynthesis workshop section produces, be the organic waste water from synthesizing methanol, synthetic oil, synthetic natural gas, synthesizing glycol workshop section.
the biochemical processing method of described coal chemical industrial waste water, the COD total amount of the residue wastewater that described synthesizing section produces is controlled at 0.2-0.5 with the ratio of the COD total amount of phenolic wastewater, in the time can not meeting the demands, can add the organic carbon source of methyl alcohol as anaerobism and anaerobic treatment process.
the biochemical processing method of described coal chemical industrial waste water, described anaerobic treatment section adopts upflow anaerobic sludge blanket reactor (UASB), controls waste water upflow velocity 1-2m/h.
the biochemical processing method of described coal chemical industrial waste water, described one-level aerobic treatment section adopts head end or multipoint water feeding mode, and aeration head adopts apparatus capable of fluctuating, can guarantee influent load, the utilization ratio of oxygen, aerating apparatus is easy to maintenance; Described micronutrient element is that iron, nickel, cobalt, phosphorus, copper, manganese, zinc, sodium, boric acid, magnesium, calcium, addition are 0.01-0.1 ‰, by weight the mark ratio.
the biochemical processing method of described coal chemical industrial waste water, it is filtration medium that described sand filter be take gravel or quartz sand, quartz sand particle size 1-10mm, porosity 40-50%.
beneficial effect:
1. the present invention is by the coal chemical industrial waste water that dealt with to waste water, particularly lurgi gasifier gasification waste water and the Treatment of Coking Effluent difficulty is large, processing cost is high, the unsettled problem of effluent quality, have advantages of that anti-load impact ability is strong, treatment effect good, running cost is low.
the wastewater treatment that the present invention is applicable to adopting coal methyl alcohol processed, coal liquefaction, the coal preparing natural gas process of lurgi gasifier gasifying process to produce.
, advantage of the present invention is distributed in corresponding embodiment.
the accompanying drawing explanation:
fig. 1 is process flow diagram of the present invention.Wherein, 1 is chemosynthesis raffinate methyl alcohol, and 2 is anaerobic treatment, and 3 is the one-level aerobic treatment, and 4 is anaerobic treatment, and 5 is the secondary aerobic treatment, and 6 is coagulation, and 7 is sand filtration, and 8 is water outlet, and 9 is pretreatment of phenol wastewater.
embodiment:
embodiment 1:
a kind of biochemical processing method of coal chemical industrial waste water, the method step comprises: pre-treatment, anaerobic treatment, one-level aerobic treatment, anaerobic treatment, secondary aerobic treatment, coagulating sedimentation, sand filtration, effluent quality COD≤100mg/L after processing, BOD5≤30mg/L, sulfide≤1mg/L, prussiate≤0.5mg/L, suspended substance≤70mg/L.
embodiment 2:
the biochemical processing method of embodiment 1 described coal chemical industrial waste water, the biochemical processing method of described coal chemical industrial waste water is characterized in that: described pre-treatment is that at first the high-concentration phenolic wastewater that gasification, destructive distillation produce is precipitated the pre-treatment such as oil removing, ammonia still process, dephenolize; Described anaerobic treatment is that pretreated phenol water is entered to anaerobic treatment workshop section, introduce the residue wastewater that chemosynthesis workshop section produces simultaneously, regulate the COD total amount ratio 0.2-0.5 of synthetic raffinate COD total amount and phenol water, add suitable micronutrient element, control temperature 36-38 ℃, pH value 7-7.5, residence time 20-30 hour, COD decreasing ratio 20-40%, total phenol removal rate 13-46%, total ammonia removal rate 18-25%.
embodiment 3:
the biochemical processing method of embodiment 1 or 2 described coal chemical industrial waste water, described one-level aerobic treatment is that the waste water after anaerobic treatment is entered to one-level aerobic treatment workshop section, control temperature 28-35 ℃, pH value 6.5-8.5, DO value 0.5-4mg/L, residence time 20-30 hour, COD decreasing ratio 80-95%, total phenol removal rate 60-80%, total ammonia removal rate 40-70%; Described secondary lacks/and aerobic treatment is that the waste water after aerobic treatment is carried out to secondary anoxic/aerobic treatment again, flow into successively anoxic section and aerobic section, anoxic section DO value 0-0.5mg/L, aerobic section DO value 0.5-5mg/L, the anoxic section is added residue wastewater that synthesizing section produces or methyl alcohol as organic carbon source, the BOD5:TN>=4-6 of anaerobic treatment pond solution; Control temperature 28-35 ℃, pH value 6.5-8.5, residence time 10-15 hour, secondary aerobic treatment pond BOD5≤20mg/L, be beneficial to the nitrifier increment, controls temperature 28-35 ℃, pH value 6.5-8.5, residence time 10-15 hour, COD decreasing ratio 30-40%, total phenol removal rate 40-60%, total ammonia removal rate 50-70%, described anaerobic treatment section, adopt the gallery pulling flow type, biologic packing material is installed in anoxic pond, and packing volume accounts for the 5-10% of anoxic pond volume; Described secondary aerobic treatment section, adopt the gallery pulling flow type, head end water inlet or multipoint water feeding, and the aerobic section effluent recycling is to anoxic section, reflux ratio 1-1.5.
embodiment 4:
the biochemical processing method of embodiment 1 or 2 or 3 described coal chemical industrial waste waters, the biochemical processing method of described coal chemical industrial waste water, described coagulant precipitation is that the waste water after biochemical treatment is flowed into to coagulative precipitation tank, add flocculation agent, carry out the coagulating sedimentation processing, residence time 4-8 hour, dosing mud in bottom is discharged system, with the excess sludge rear outward transport of together dewatering; Described sand filtration is that the water outlet after coagulating sedimentation is processed flows into sand filter, filters and removes mud impurity, effluent quality COD≤100mg/L, BOD5≤30mg/L, ammonia nitrogen concentration≤15mg/L, concentration of suspension≤70mg/L; Described coagulating sedimentation is processed flocculation agent used, can be ferric oxide, polymer alumina, iron aluminium composite flocculation agent, carboxymethyl cellulose, flocculation agent addition 0.01-0.1%, weight percent.
embodiment 5:
the biochemical processing method of embodiment 1 or 2 or 3 or 4 described coal chemical industrial waste waters, described pretreated phenolic wastewater, water-quality guideline is: COD concentration 1500-3500mg/L, total phenol concentration 300-700mg/L, unit phenol concentration 50-200mg/L, ammonia nitrogen concentration 100-250mg/L, pH value 6.0-8.0.
embodiment 6:
the biochemical processing method of embodiment 1 or 2 or 3 or 4 or 5 described coal chemical industrial waste waters, the residue wastewater that described chemosynthesis workshop section produces, be the organic waste water from synthesizing methanol, synthetic oil, synthetic natural gas, synthesizing glycol workshop section.
embodiment 7:
the biochemical processing method of embodiment 1 or 2 or 3 or 4 or 5 or 6 described coal chemical industrial waste waters, the COD total amount of the residue wastewater that described synthesizing section produces is controlled at 0.2-0.5 with the ratio of the COD total amount of phenolic wastewater, in the time can not meeting the demands, can add the organic carbon source of methyl alcohol as anaerobism and anaerobic treatment process.
embodiment 8:
the biochemical processing method of embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7 described coal chemical industrial waste waters, described anaerobic treatment section adopts upflow anaerobic sludge blanket reactor (UASB), controls waste water upflow velocity 1-2m/h.
embodiment 9:
the biochemical processing method of embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 described coal chemical industrial waste waters, described one-level aerobic treatment section adopts head end or multipoint water feeding mode, and aeration head adopts apparatus capable of fluctuating, can guarantee influent load, the utilization ratio of oxygen, aerating apparatus is easy to maintenance; Described micronutrient element is that iron, nickel, cobalt, phosphorus, copper, manganese, zinc, sodium, boric acid, magnesium, calcium, addition are 0.01-0.1 ‰, the weight permillage.
embodiment 10
the biochemical processing method of embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 described coal chemical industrial waste waters, it is filtration medium that described sand filter be take gravel or quartz sand, quartz sand particle size 1-10mm, porosity 40-50%.
embodiment 11:
the biochemical processing method of embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 described coal chemical industrial waste waters, described anaerobic treatment section, adopt the gallery pulling flow type, and biologic packing material is installed in anoxic pond, and packing volume accounts for the 5-10% of anoxic pond volume.Described secondary aerobic treatment section, adopt the gallery pulling flow type, head end water inlet or multipoint water feeding, and the aerobic section effluent recycling is to anoxic section, reflux ratio 1-1.5.
embodiment 12:
the biochemical processing method of embodiment 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 described coal chemical industrial waste waters, described coagulating sedimentation is processed flocculation agent used, can be ferric oxide, polymer alumina, iron aluminium composite flocculation agent, carboxymethyl cellulose, the 0.01-0.1% that the flocculation agent addition is the untreated liquid scale of construction, weight percent.
embodiment 13:
the biochemical processing method of above-mentioned coal chemical industrial waste water, the biochemical processing process of coal chemical industrial waste water is comprised of anaerobic treatment, one-level aerobic treatment, secondary anoxic/aerobic treatment, coagulating sedimentation, Sand Filtration System.Anaerobic treatment adopts upflow anaerobic sludge blanket reactor (UASB), diameter 7.5 m, and high 17 m, inside establish bottom and establish water distributor, and triphase separator and methane collection cleaning equipment are established in top.The aerobic treatment pond is skeleton construction, length is respectively 35 m, 30 m, 7 m, be divided into 6 gallerys, head end water inlet or multipoint water feeding adopt the gallery pulling flow type, establish spoke stream swash plate secondary sedimentation basins, sloping plate pipe is installed on top, bottom is established conical collector and is scraped mud equipment, and shore pipe is established back-purge system, and diameter, height are respectively 6.5 m, 6 m, part sludge reflux, to the aeration tank head end, effluxes after a part of discharge system dehydration.Secondary anaerobic treatment pond is skeleton construction, and length is respectively 35 m, 15m, 7 m, is divided into 3 gallerys, and head end water inlet or multipoint water feeding adopt the gallery pulling flow type.Secondary aerobic treatment pond is skeleton construction, and length is respectively 35 m, 15 m, 7 m, is divided into 3 gallerys, and head end water inlet or multipoint water feeding adopt the gallery pulling flow type, and the oxygen gallery of holding concurrently is installed biologic packing material.If spoke stream swash plate secondary sedimentation basins, sloping plate pipe is installed on top, and bottom is established conical collector and scraped mud equipment, shore pipe is established back-purge system, diameter, height are respectively 6.5 m, 6 m, and a part of sludge reflux, to the oxygen compatibility pool head end, effluxes after a part of discharge system dehydration.Coagulative precipitation tank is spoke flow inclined plate sedimentation pond, and sloping plate pipe is installed on top, and bottom is established conical collector and scraped mud equipment, and shore pipe is established back-purge system, and dosing mud in bottom is discharged system, and with the excess sludge rear outward transport of together dewatering, diameter, height are respectively 6.5 m, 6 m.Sand filter adopts the downflow system operation scheme, establishes 8 little Chi, and every pond length is respectively 5m, 8m, 6 m, establishes backwash gas distribution, cloth wetting system below the filter plate of bottom, and the backwash water collection device is established on top, and backwash water is turned back to coagulative precipitation tank.
the phenolic wastewater that the lurgi gasifier gasifying process produces after oily water separation, depickling, deamination, dephenolize pre-treatment, the COD value 3200mg/L of waste water, BOD value 920mg/L, total phenol 530mg/L, volatile phenol 120mg/L, total ammonia 210mg/L, prussiate 3.1mg/L, pH value 6.5.
pretreated phenol water enters anaerobic treatment workshop section, introduce the residue wastewater that chemosynthesis workshop section produces simultaneously, regulate the COD total amount ratio 0.25 of synthetic raffinate COD total amount and phenol water, the micronutrient element that interpolation is comprised of FeCl24H2O, CoCl26H2O, NiCl26H2O, control temperature 36-38 ℃, pH value 7-8,25 hours residence time, COD decreasing ratio 39%, total phenol removal rate 36%, total ammonia removal rate 22%; Waste water after anaerobic treatment enters aerobic treatment workshop section, controls temperature 28-35 ℃, pH value 6-7, DO value 2.5-3mg/L, 25 hours residence time, COD decreasing ratio 89%, total phenol removal rate 72%, total ammonia removal rate 66%; Waste water after aerobic treatment carries out secondary anoxic/aerobic treatment again, flow into successively anoxic section and aerobic section, anoxic section DO value<0.5mg/L, aerobic section DO value 2.5-3mg/L, the residue wastewater that anoxic section interpolation synthesizing section produces or methyl alcohol are as organic carbon source, secondary oxygen compatibility pool mixed liquid B OD5:TN is greater than 4-6, secondary Aerobic Pond mixed liquid B OD5≤20mg/L, control temperature 28-35 ℃, pH value 6.5-7.5,25 hours residence time, COD decreasing ratio 35%, total phenol removal rate 56%, total ammonia removal rate 75%; Waste water after biochemical treatment flows into coagulative precipitation tank, adds iron aluminium composite flocculation agent, carries out the coagulating sedimentation processing, residence time 4-6 hour, COD decreasing ratio 20%, total phenol removal rate 40%, total ammonia removal rate 0.5%, dosing mud in bottom is discharged system, with the excess sludge rear outward transport of together dewatering; Water outlet after coagulating sedimentation is processed flows into sand filter, filters mud impurity CO D decreasing ratio 20%, the total phenol removal rate 10% removed, total ammonia removal rate 0.5%, effluent quality COD≤100mg/L, BOD5≤30mg/L, ammonia nitrogen concentration≤15mg/L, concentration of suspension≤70mg/L.
the water quality analysis data of table 1 different treatment stage water outlet
| Water-quality guideline | Pretreated waste water | Anaerobic treatment | Aerobic treatment | Secondary anoxic/aerobic treatment | Coagulating sedimentation | Sand filtration |
| COD/(mg/L) | 3200 | 1950 | 214 | 139 | 111 | 88 |
| BOD5/(mg/L) | 920 | ? | ? | ? | ? | ? |
| Total phenol/(mg/L) | 530 | 330 | 92 | 40 | 28 | 25 |
| Total ammonia/(mg/L) | 210 | 160 | 54 | 13 | 12.3 | 12.1 |
| Prussiate/(mg/L) | 3.1 | ? | ? | ? | ? | ? |
| PH value | 6.5 | ? | ? | ? | ? | ? |
embodiment 13:
the biochemical processing method of above-mentioned coal chemical industrial waste water, the biochemical processing process of coal chemical industrial waste water and equipment are as described in embodiment 12.The phenolic wastewater that the lurgi gasifier gasifying process produces after oily water separation, depickling, deamination, dephenolize pre-treatment, the COD value 3500mg/L of waste water, BOD value 830mg/L, total phenol 610mg/L, volatile phenol 110mg/L, total ammonia 260mg/L, prussiate 4.7mg/L, pH value 6.5.
pretreated phenol water enters anaerobic treatment workshop section, introduce the residue wastewater that chemosynthesis workshop section produces simultaneously, regulate the COD total amount ratio 0.4 of synthetic raffinate COD total amount and phenol water, the micronutrient element that interpolation is comprised of FeCl24H2O, CoCl26H2O, NiCl26H2O, control temperature 3-38 ℃, pH value 7-8,30 hours residence time, COD decreasing ratio 29%, total phenol removal rate 39%, total ammonia removal rate 25%; Waste water after anaerobic treatment enters aerobic treatment workshop section, controls temperature 28-35 ℃, pH value 7-8, DO value 2-3mg/L, 25 hours residence time, COD decreasing ratio 92%, total phenol removal rate 75%, total ammonia removal rate 60%; Waste water after aerobic treatment carries out secondary anoxic/aerobic treatment again, flows into successively anoxic section and aerobic section, anoxic section DO value 0-0.5mg/L, aerobic section DO value 1-2mg/L, the residue wastewater that anoxic section interpolation synthesizing section produces or methyl alcohol are as organic carbon source, and secondary oxygen compatibility pool mixed liquid B OD5:TN is greater than 4-6, secondary Aerobic Pond mixed liquid B OD5≤20mg/L, control temperature 28-35 ℃, pH value 6.5-8.5,25 hours residence time, COD decreasing ratio 35%, total phenol removal rate 52%, total ammonia removal rate 70%; Waste water after biochemical treatment flows into coagulative precipitation tank, adds flocculation agent, carries out the coagulating sedimentation processing, residence time 4-6 hour, COD decreasing ratio 20%, total phenol removal rate 40%, total ammonia removal rate 0.5%, dosing mud in bottom is discharged system, with the excess sludge rear outward transport of together dewatering; Water outlet after processing flows into sand filter, filters and removes mud impurity, COD decreasing ratio 10%, total phenol removal rate 10%, total ammonia removal rate 0.5%, effluent quality COD≤100mg/L, BOD5≤30mg/L, ammonia nitrogen concentration≤15mg/L, concentration of suspension≤70mg/L.
the water quality analysis data of table 2 different treatment stage water outlet
| Water-quality guideline | Pretreated waste water | Anaerobic treatment | Aerobic treatment | Secondary anoxic/aerobic treatment | Coagulating sedimentation | Sand filtration |
| COD/(mg/L) | 3500 | 2480 | 198 | 128 | 102 | 91 |
| BOD5/(mg/L) | 830 | ? | ? | ? | ? | ? |
| Total phenol/(mg/L) | 610 | 370 | 92 | 44 | 26 | 23 |
| Total ammonia/(mg/L) | 260 | 190 | 76 | 15 | 14.2 | 13.4 |
| Prussiate/(mg/L) | 4.7 | ? | ? | ? | ? | ? |
| PH value | 6.5 | ? | ? | ? | ? | ? |
embodiment 14:
the biochemical processing method of above-mentioned coal chemical industrial waste water, water treating equipment are as described in embodiment 12.
the phenolic wastewater that the lurgi gasifier gasifying process produces after oily water separation, depickling, deamination, dephenolize pre-treatment, the COD value 2400mg/L of waste water, BOD value 730mg/L, total phenol 410mg/L, volatile phenol 90mg/L, total ammonia 130mg/L, prussiate 2.7mg/L, pH value 6.5.
pretreated phenol water enters anaerobic treatment workshop section, introduce the residue wastewater that chemosynthesis workshop section produces simultaneously, regulate the COD total amount ratio 0.4 of synthetic raffinate COD total amount and phenol water, the micronutrient element that interpolation is comprised of FeCl24H2O, CoCl26H2O, NiCl26H2O, control temperature 36-38 ℃, pH value 7-8,20 hours residence time, COD decreasing ratio 25%, total phenol removal rate 30%, total ammonia removal rate 20%; Waste water after anaerobic treatment enters aerobic treatment workshop section, controls temperature 28-35 ℃, pH value 7-8, DO value 2-3mg/L, 20 hours residence time, COD decreasing ratio 90%, total phenol removal rate 75%, total ammonia removal rate 50%; Waste water after aerobic treatment carries out secondary anoxic/aerobic treatment again, flows into successively the anoxic section and becomes reconciled foster section, anoxic section DO value<0.5mg/L, aerobic section DO value 1-2mg/L, the residue wastewater that anoxic section interpolation synthesizing section produces or methyl alcohol are as organic carbon source, and secondary oxygen compatibility pool mixed liquid B OD5:TN is greater than 4-6, secondary Aerobic Pond mixed liquid B OD5≤20mg/L, control temperature 28-35 ℃, pH value 6.5-7.5,20 hours residence time, COD decreasing ratio 35%, total phenol removal rate 50%, total ammonia removal rate 70%; Waste water after biochemical treatment flows into coagulative precipitation tank, adds flocculation agent, carries out the coagulating sedimentation processing, residence time 4-6 hour, COD decreasing ratio 20%, total phenol removal rate 30%, total ammonia removal rate 10%, dosing mud in bottom is discharged system, with the excess sludge rear outward transport of together dewatering; Water outlet after coagulating sedimentation is processed flows into sand filter, filters and removes mud impurity, COD decreasing ratio 10%, total phenol removal rate 10%, total ammonia removal rate 0.5%, effluent quality COD≤100mg/L, BOD5≤30mg/L, ammonia nitrogen concentration≤15mg/L, concentration of suspension≤70mg/L.
the water quality analysis data of table 3 different treatment stage water outlet
| Water-quality guideline | Pretreated waste water | Anaerobic treatment | Aerobic treatment | Secondary anoxic/aerobic treatment | Coagulating sedimentation | Sand filtration |
| COD/(mg/L) | 2400 | 1800 | 180 | 117 | 93.6 | 84 |
| BOD5/(mg/L) | 730 | ? | ? | ? | ? | ? |
| Total phenol/(mg/L) | 410 | 260 | 65 | 42 | 12.6 | 11 |
| Total ammonia/(mg/L) | 130 | 100 | 50 | 15 | 13.5 | 12.8 |
| Prussiate/(mg/L) | 2.7 | ? | ? | ? | ? | ? |
| PH value | 6.5 | ? | ? | ? | ? | ? |
Claims (10)
1. the biochemical processing method of a coal chemical industrial waste water, it is characterized in that: the method step comprises: pre-treatment, anaerobic treatment, one-level aerobic treatment, anaerobic treatment, secondary aerobic treatment, coagulating sedimentation, sand filtration, effluent quality COD≤100mg/L after processing, BOD5≤30mg/L, sulfide≤1mg/L, prussiate≤0.5mg/L, suspended substance≤70mg/L, water-quality guideline is: COD concentration 1500-3500mg/L, total phenol concentration 300-700mg/L, unit phenol concentration 50-200mg/L, ammonia nitrogen concentration 100-250mg/L, pH value 6.0-8.0.
2. the biochemical processing method of coal chemical industrial waste water according to claim 1 is characterized in that: described pre-treatment is that at first the high-concentration phenolic wastewater that gasification, destructive distillation produce is precipitated the pre-treatment such as oil removing, ammonia still process, dephenolize; Described anaerobic treatment is that pretreated phenol water is entered to anaerobic treatment workshop section, introduce the residue wastewater that chemosynthesis workshop section produces simultaneously, regulate the COD total amount ratio 0.2-0.5 of synthetic raffinate COD total amount and phenol water, control temperature 36-38 ℃, pH value 7-7.5, residence time 20-30 hour, COD decreasing ratio 20-40%, total phenol removal rate 13-46%, total ammonia removal rate 18-25%.
3. the biochemical processing method of coal chemical industrial waste water according to claim 1 and 2, it is characterized in that: described one-level aerobic treatment is that the waste water after anaerobic treatment is entered to one-level aerobic treatment workshop section, control temperature 28-35 ℃, pH value 6.5-8.5, DO value 0.5-4mg/L, residence time 20-30 hour, COD decreasing ratio 80-95%, total phenol removal rate 60-80%, total ammonia removal rate 40-70%; Described secondary lacks/and aerobic treatment is that the waste water after aerobic treatment is carried out to secondary anoxic/aerobic treatment again, flow into successively anoxic section and aerobic section, anoxic section DO value 0-0.5mg/L, aerobic section DO value 0.5-5mg/L, the anoxic section is added residue wastewater that synthesizing section produces or methyl alcohol as organic carbon source, the BOD5:TN >=4-6 of anaerobic treatment pond solution; Control temperature 28-35 ℃, pH value 6.5-8.5, residence time 10-15 hour, secondary aerobic treatment pond BOD5≤20mg/L, be beneficial to the nitrifier increment, controls temperature 28-35 ℃, pH value 6.5-8.5, residence time 10-15 hour, COD decreasing ratio 30-40%, total phenol removal rate 40-60%, total ammonia removal rate 50-70%, described anaerobic treatment section, adopt the gallery pulling flow type, biologic packing material is installed in anoxic pond, and packing volume accounts for the 5-10% of anoxic pond volume; Described secondary aerobic treatment section, adopt the gallery pulling flow type, head end water inlet or multipoint water feeding, and the aerobic section effluent recycling is to anoxic section, reflux ratio 1-1.5.
4. according to the biochemical processing method of claim 1 or 2 or 3 described coal chemical industrial waste waters, it is characterized in that: described coagulant precipitation is that the waste water after biochemical treatment is flowed into to coagulative precipitation tank, add flocculation agent, carry out the coagulating sedimentation processing, residence time 4-8 hour, bottom dosing mud is discharged system, with the excess sludge rear outward transport of together dewatering; Described sand filtration is that the water outlet after coagulating sedimentation is processed flows into sand filter, filters and removes mud impurity, effluent quality COD≤100mg/L, BOD5≤30mg/L, ammonia nitrogen concentration≤15mg/L, concentration of suspension≤70mg/L; Described coagulating sedimentation is processed flocculation agent used, is ferric oxide, polymer alumina, iron aluminium composite flocculation agent, carboxymethyl cellulose, flocculation agent addition 0.01-0.1%.
5. according to the biochemical processing method of claim 1 or 2 or 3 or 4 described coal chemical industrial waste waters, it is characterized in that: described pretreated phenolic wastewater, water-quality guideline is: COD concentration 1500-3500mg/L, total phenol concentration 300-700mg/L, unit phenol concentration 50-200mg/L, ammonia nitrogen concentration 100-250mg/L, pH value 6.0-8.0.
6. according to the biochemical processing method of claim 1 or 2 or 3 or 4 or 5 described coal chemical industrial waste waters, it is characterized in that: the residue wastewater that described chemosynthesis workshop section produces is the organic waste water from synthesizing methanol, synthetic oil, synthetic natural gas, synthesizing glycol workshop section.
7. according to the biochemical processing method of claim 1 or 2 or 3 or 4 or 5 or 6 described coal chemical industrial waste waters, it is characterized in that: the COD total amount of the residue wastewater that described synthesizing section produces is controlled at 0.2-0.5 with the ratio of the COD total amount of phenolic wastewater, in the time can not meeting the demands, add the organic carbon source of methyl alcohol as anaerobism and anaerobic treatment process.
8. according to the biochemical processing method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described coal chemical industrial waste waters, it is characterized in that: described anaerobic treatment section adopts upflow anaerobic sludge blanket reactor (UASB), controls waste water upflow velocity 1-2m/h.
9. according to the biochemical processing method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 described coal chemical industrial waste waters, it is characterized in that: described one-level aerobic treatment section adopts head end or multipoint water feeding mode, aeration head adopts apparatus capable of fluctuating, can guarantee influent load, the utilization ratio of oxygen, aerating apparatus is easy to maintenance; Described micronutrient element is that iron, nickel, cobalt, phosphorus, copper, manganese, zinc, sodium, boric acid, magnesium, calcium, addition are 0.01-0.1 ‰.
10. according to the biochemical processing method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 described coal chemical industrial waste waters, it is characterized in that: it is filtration medium that described sand filter be take gravel or quartz sand, quartz sand particle size 1-10mm, porosity 40-50%.
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