CN104030533A - Cassava starch production wastewater ABIC-biological contact oxidation process-coagulation treatment combined process - Google Patents
Cassava starch production wastewater ABIC-biological contact oxidation process-coagulation treatment combined process Download PDFInfo
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Abstract
The invention relates to a cassava starch production wastewater ABIC-biological contact oxidation process-coagulation treatment combined process which comprises the following steps that: cassava cleaning wastewater and cassava residues pressure filtration water are filtered and deposited, primary and secondary separation watewater is recovered in light-weight starch and protein and enters a regulating pond for regulating the pH value and temperature and then successively enters ABIC and a biological contact oxidation pond for anaerobic treatment and aerobiotic treatment, standing, deposition and impurity removal are carried out in coagulation deposition pond, and a supernatant can be discharged on a standard or recycled; the concentration of dissolved oxygen which is subjected to anaerobic reaction in ABIC is lower than 0.2 mg/L, and the hydraulic retention time is 12-48 hours; the concentration of the dissolved oxygen contained in the biological contact oxidation pond is higher than 2 mg/L, and the hydraulic retention time is 12-24 hours. The technology disclosed by the invention has the advantages of stability in effluent standard reaching, small engineering investment, low operating cost, recyclability in biomass energy, easiness for management and is convenient for engineering popularization and application and provides a new technical way for the wastewater control of a cassava starch industry.
Description
Technical field
The invention belongs to technology for treating industrial waste water field, particularly wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment combination process.
Background technology
Tapioca (flour) industry Sewage Water Emissions amount is large, has that cassava starch wastewater intractability is large, expense is high, a problem such as qualified discharge not all the time.In October, 2010, country promulgated " starch industry pollution discharge standard " (GB25461-2010), this standard regulation rises in October, 2013, existing Starch Production enterprise and newly-built Starch Production enterprise must carry out the newly-built enterprise of table 2 more strict in this standard pollution discharge standard limit value, and this wastewater treatment level to tapioca (flour) industry is had higher requirement again.
Wastewater from cassava starch production comprises cassava Cleaning Wastewater, flash liberation waste water, secondary separation waste water and manioc waste press filtration water etc.The principal feature of wastewater from cassava starch production has: 1) wastewater through organic matter and SS content are high, and acid large, its COD concentration is generally higher than 10000mg/L, and SS concentration is about 3000mg/L, and pH value is 3～5; 2) cycling utilization of wastewater rate is low, thereby causes the organic pollutant amount of its discharge quite large, 1 ton of starch discharge organism 150～250kg of average every production; 3) wastewater biochemical handling property is good, and the value of BOD/COD is more than 0.6, to adopting microbiological treatment very favourable, particularly favourable to producing methane through anaerobic fermentation; 4) in waste water, contain SO
4 2-with unwanted components such as CN-ions, unfavorable to microbiological treatment.
Domestic wastewater from cassava starch production treatment technology has been carried out to more research, wastewater from cassava starch production treatment process is more at present, respectively has relative merits.Because of wastewater from cassava starch production organic contamination substrate concentration high, adopt separately a kind for the treatment of process to be difficult to reach emission limit requirement, so generally adopt kinds of processes to combine to process wastewater from cassava starch production both at home and abroad, processing means are roughly pre-treatment+anaerobic technique+aerobic microorganisms combination process.Common pretreatment technology has natural sedimentation method, coagulant sedimentation; Anaerobic technique mainly contains anaerobic jar, up-flow anaerobic sludge blanket (UASB), expanded granular sludge bed (EGSB), internal-circulation anaerobic reactor (IC) etc., and aerobic microorganisms mainly contains aerobic activated sludge process, sequencing batch active sludge (SBR), biological contact oxidation process etc.
The process combination form that at present built wastewater from cassava starch production processing engineering adopts is more, has natural sedimentation+UASB+ aerobic activated sludge process, natural sedimentation+UASB+SBR method, coagulation+UASB+SBR method, UASB+ biological contact oxidation process, EGSB+SBR method, IC+SBR method etc.From built engineering actual motion effect, above combination process process after water outlet can not stablize and reach emission limit requirement, in operational process, also there are many problems, as more in the suspended substance containing in wastewater from cassava starch production, natural sedimentation method length consuming time, removal to suspended substance is limited in one's ability, and efficiency is not high; If directly wastewater from cassava starch production is carried out to coagulating treatment, need to add a large amount of acid-base modifiers and coagulated agent, processing cost is high; UASB is poor to the high water treatment effect of suspension content, and impact resistance is not strong, adopts the combination process of UASB usually to cause follow-up aerobic microbiological processing to go wrong because UASB water outlet is not good, affects final outflow water water quality; The granule sludge of EGSB is cultivated difficulty, start-up course length consuming time, and operation difficulty is higher; IC reactor cost is high, and medium and small sized enterprises are difficult to burden; It is difficult that aerobic activated sludge process and SBR method excess sludge production are large, processing is disposed, and easily occurs the problem of sludge bulking floating in operational process, while processing waste water, need to rely on complicated robot, and maintenance management difficulty is higher.Comprehensive above reason, current combination process can not be efficiently, stable, process wastewater from cassava starch production economically, urgent need studies that a set of water outlet is up to standard, stable, cheap, the wastewater from cassava starch production treatment combination technique of convenient management.
Anaerobic baffled inner circulation reactor ABIC is based on IC and two kinds of third generation anaerobic reactor exploitations of baffled reactor, this reactor has obtained Chinese patent, in reactor, there is good hydraulics and the circulation stirring system without additionaling power, can improve waste water and mud mixed effect, improve capacity utilization, reaction efficiency and impact resistance in reactor, strengthen water treatment effect.The effectively biomass collection energy reduce sludge loss of the triphase separator of simultaneously establishing in ABIC, further reduces anaerobic effluent pollutant load.Biological contact oxidation process relies on and is attached to the microbiological treatment waste water of growing on filler, in each stage of reaction, in reactor, biophase remains fully and contacts with waste water, dissolution oxygen utilization rate and unit volume load are improved, thoroughly improve aerobic activated sludge process and SBR method in precipitate phase waste water and mud mixed effect is poor, reaction efficiency is low defect, greatly promoted denitrification and the phosphor-removing effect of aerobic system.In addition, biological contact oxidation process does not need complicated electronic auto-control equipment, is difficult for occurring sludge bulking, easy handling management; After processing waste water, excess sludge generation is few, and excess sludge disposal costs is low.Coagulant sedimentation less investment, equipment is simple, good to suspended substance treatment effect, and removal effect is stable, and operational management is convenient.Above three kinds of techniques are combined, and the operating parameter that regulates each technique is had complementary advantages to realize, and is expected to create the treatment combination technique of the wastewater from cassava starch production of a set of high efficient and reliable, cheap, convenient management.
Summary of the invention
It is reasonable in design that the technical problem to be solved in the present invention is to provide a kind of operating parameter, water treatment effect is remarkable, the indices of discharge of wastewater is stable be down to " starch industry pollution discharge standard " (GB25461-2010) in the newly-built enterprise of table 2 water pollute below direct emission limit, reclaim biomass energy simultaneously, construction investment is little, running cost reduces, realize the doulbe-sides' victory of environmental benefit and economic benefit, and be easy to wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment combination process of management.
The present invention solves the problems of the technologies described above with following technical scheme:
A kind of wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment combination process, main technological steps is:
(1) cassava Cleaning Wastewater and manioc waste press filtration water is through grid filtration, settling pit precipitation, enters equalizing tank after removing cassava skin in waste water, manioc waste, silt;
(2) flash liberation waste water and secondary separation waste water enter after preliminary sedimentation tank is recycled lightweight starch and protein and also enter equalizing tank;
(3) add chemical agent to equalizing tank and regulate composite waste pH value and temperature;
(4) equalizing tank water outlet pumps into anaerobic baffled inner circulation reactor ABIC and carries out anaerobic reaction;
Anaerobic reaction complete after water outlet enter biological contact oxidation pond and carry out aerobic treatment;
(6) biological contact oxidation pond water outlet flows into coagulative precipitation tank, add flocculation agent and coagulant aids and fully stir after staticly settle, further remove after suspended substance, supernatant liquid can outside discharge up to standard or is back to production;
It is characterized in that:
Adding chemical agent adjusting composite waste pH value to equalizing tank is 6～8, and temperature is 30～40 DEG C, and the hydraulic detention time of equalizing tank is 4h;
The temperature that anaerobic baffled inner circulation reactor ABIC carries out anaerobic reaction is 35 DEG C, and fluctuation is no more than 1 DEG C up and down; Guarantee in reactor that dissolved oxygen concentration is lower than 0.2mg/L; Hydraulic detention time is 12～48h;
In biological contact oxidation pond, aerating wastewater maintains dissolved oxygen concentration all the time higher than 2mg/L; Hydraulic detention time is 12～24h.
Wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment combination process of the present invention, when the organic volumetric loading of ABIC is in 8～15kgCOD/ (m
3d), time, ABIC can exceed 90% to the clearance of waste water COD; After whole combination process is processed, total clearance of waste water COD is greater than 99%, and water outlet COD value is less than 50mg/L.Stable water outlet is up to standard, construction investment is little, running cost is cheap, recyclable biomass energy, management are simple, is convenient to through engineering approaches and applies, for tapioca (flour) industry waste water treatment provides new technological approaches.
Brief description of the drawings
Fig. 1 is the process flow sheet that the present invention processes wastewater from cassava starch production.
Fig. 2 is that in the present invention, ABIC processes wastewater from cassava starch production steady operation period Inlet and outlet water COD change in concentration and COD clearance graph of a relation.
Fig. 3 is that the present invention processes wastewater from cassava starch production steady operation period Inlet and outlet water COD change in concentration and COD clearance graph of a relation.Because COD concentration in water outlet is almost nil, therefore cannot represent in the drawings.
Embodiment
Basic ideas of the present invention are: wastewater from cassava starch production is after pre-treatment, first adopt efficient anaerobe treatment facility ABIC to carry out anaerobic treatment to it, reclaim biomass energy simultaneously, and then utilize high-efficiency aerobic biological treating equipment biological contact oxidation pond to carry out aerobic treatment to ABIC water outlet, finally use materialization treatment facility coagulative precipitation tank to remove the suspended matter in biological contact oxidation pond water outlet.
The concrete implementation step that the present invention adopts is as follows:
1) the cassava Cleaning Wastewater in tapioca (flour) production process and manioc waste press filtration water first pass through grid filtration, remove bulk cassava skin, manioc waste, then flow into settling pit precipitation, settling pit hydraulic detention time is 10min, by the easily material of sedimentation such as the small-particle cassava skin in gravity natural sedimentation removal waste water, manioc waste, silt, water outlet enters equalizing tank;
2) flash liberation waste water and secondary separation waste water enter preliminary sedimentation tank precipitation, hydraulic detention time is 1h, and sedimentable matter main component is lightweight starch and protein, can be recycled, water outlet enters equalizing tank, and this step can be removed approximately 30% COD and suspended substance;
3) water outlet of step 1 and step 2 enters equalizing tank mix and blend, adds chemical agent and regulates composite waste pH value to 6～8, suitably heats composite waste and makes it temperature increase to 30～40 DEG C, and the hydraulic detention time of equalizing tank is 4h;
4) step 3 water outlet is pumped into ABIC and carry out anaerobic reaction, according to water inlet organic contamination substrate concentration difference, hydraulic detention time is set to 12～48h, maintaining temperature in ABIC is 35 DEG C, fluctuation is no more than 1 DEG C up and down, guarantee in reactor that dissolved oxygen concentration is lower than 0.2mg/L, for anaerobic reaction is created strict anaerobic environment, being beneficial to reaction efficiently carries out, this step can be removed in water inlet approximately 90% COD, and producing large number of biological mass-energy source biogas, methane content of bilogas, higher than 50%, fully utilizes after can collecting;
5) step 4 water outlet is introduced to biological contact oxidation pond, aerating wastewater in pond is maintained to dissolved oxygen concentration all the time higher than 2mg/L, it is 12～24h that hydraulic detention time is set, and guarantees that waste water contacts with microbial film to carry out abundant aerobic reaction the COD in degradable water inlet more than 90%;
6) step 5 water outlet flows into coagulative precipitation tank, add flocculant poly aluminum chloride 1～2g/L and coagulant aids polyacrylamide 1～3mg/L, after fully stirring, staticly settle, hydraulic detention time is 1～2h, precipitate the rear outside environmental emission of supernatant liquid or be back to production, throw out can agricultural or outward transport landfill disposal after concentrating, dewatering.
When the organic volumetric loading of ABIC is in 8～15kgCOD/ (m
3d), time, ABIC can exceed 90% to the clearance of waste water COD; After whole combination process is processed, total clearance of waste water COD is greater than 99%, and water outlet COD value is less than 50mg/L.
Inlet and outlet water COD changing conditions and the COD clearance of experimental phase ABIC steady operation period are shown in Fig. 2, as shown in Figure 2, in the time that inlet COD concentration is 15000～18000mg/L, the COD clearance of ABIC can stable maintenance more than 90%.Inlet and outlet water situation and the COD clearance of experimental phase combination process steady running are shown in Fig. 3, and as shown in Figure 3, in the time that inlet COD concentration is 15000～18000mg/L, the COD clearance of process combination can maintain more than 99%.
Be described specifically below in conjunction with embodiment.
Embodiment 1
The former employing UASB-of Guangxi tapioca (flour) factory activated sludge process-Coagulation Method combination process process for producing waste water, factory effluent after treatment effluent COD concentration is 100～200mg/L, BOD
5concentration is 30～40mg/L, SS concentration is 10～20mg/L, ammonia nitrogen concentration is 20～30mg/L, and total phosphorus concentration is 4～8mg/L, all can not reach " starch industry pollution discharge standard " (GB25461-2010) directly emission limit requirement of middle table 2.
Adopt ABIC-biological contact oxidation process-combined coagulant technology technique of the present invention to process this factory production waste water, will be through grid and the pretreated cassava Cleaning Wastewater of settling pit and manioc waste press filtration water, enter respectively equalizing tank mix and blend through the pretreated flash liberation waste water of preliminary sedimentation tank and secondary separation waste water, regulate composite waste pH value to 6～8, temperature to 30～32 DEG C.Equalizing tank water outlet pumps into ABIC, and maintaining temperature in ABIC is 35 DEG C, and setting hydraulic detention time is 36h, makes anaerobion in waste water and reactor carry out abundant anaerobic reaction.Biological contact oxidation pond is introduced in ABIC water outlet, and to aeration in pond, to keep dissolved oxygen more than 2mg/L, hydraulic detention time is set to 24h, makes aerobic microbiological in waste water and pond carry out abundant aerobic reaction.Biological contact oxidation pond water outlet flows in coagulative precipitation tank, adds flocculant poly aluminum chloride 1.8g/L, and coagulant aids polyacrylamide 2mg/L, staticly settles after being fully uniformly mixed, and hydraulic detention time is set to 1h.Coagulative precipitation tank final outflow water COD concentration is 20～40mg/L, BOD
5concentration is 5～15mg/L, SS concentration is 10～20mg/L, ammonia nitrogen concentration, lower than 2mg/L, meets the directly emission limit requirement of " starch industry pollution discharge standard " table 2 (GB25461-2010) completely, adopts the wastewater effluent water quality of the present invention front and back to contrast in table 1.
Table 1 Guangxi tapioca (flour) factory adopts the outlet effect contrast of the present invention front and back
| Numbering | Project | Adopt before the present invention | Adopt after the present invention | Emission limit * |
| 1 | PH value | 6～8 | 6～8 | 6～9 |
| 2 | SS | 10～20mg/L | 10～20mg/L | ≤30mg/L |
| 3 | Chemical oxygen demand (COD) (COD cr) | 100～200mg/L | 20～40mg/L | ≤100mg/L |
| 4 | Five-day BOD (BOD 5) | 30～40mg/L | 5～15mg/L | ≤20mg/L |
| 5 | Ammonia nitrogen | 20～30mg/L | <2mg/L | ≤15mg/L |
| 6 | Total phosphorus | 4～8mg/L | <1mg/L | <1mg/L |
* " starch industry pollution discharge standard " (GB25461-2010) middle direct emission concentration limit value of table 2 newly-built enterprise water pollutant.
Embodiment 2
The former employing UASB-SBR of Guangxi tapioca (flour) factory method combination process process for producing waste water, factory effluent after treatment effluent COD concentration is 80～150mg/L, BOD
5concentration is 10～30mg/L, and SS concentration is 10～20mg/L, and ammonia nitrogen concentration is 5～10mg/L, and total phosphorus concentration is 4～8mg/L, COD, BOD
5, total phosphorus go out water concentration all can not stablize reach " starch industry pollution discharge standard " (GB25461-2010) in directly emission limit requirement of table 2.
Adopt ABIC-biological contact oxidation process-combined coagulant technology technique of the present invention to process wastewater from cassava starch production, will be through grid and the pretreated cassava Cleaning Wastewater of settling pit and manioc waste press filtration water, enter respectively equalizing tank mix and blend through the pretreated flash liberation waste water of preliminary sedimentation tank and secondary separation waste water, within regulating composite waste pH value to 6～8, temperature to 38～40 DEG C.Equalizing tank water outlet pumps into ABIC, and maintaining temperature in ABIC is 35 DEG C, and setting hydraulic detention time is 36h, makes anaerobion in waste water and reactor carry out abundant anaerobic reaction.Biological contact oxidation pond is introduced in ABIC water outlet, and to aeration in pond, to keep dissolved oxygen more than 2mg/L, hydraulic detention time is set to 24h, makes aerobic microbiological in waste water and pond carry out abundant aerobic reaction.Biological contact oxidation pond water outlet flows in coagulative precipitation tank, adds flocculant poly aluminum chloride 1.6g/L, and coagulant aids polyacrylamide 1mg/L, staticly settles after being fully uniformly mixed, and hydraulic detention time is set to 2h.Coagulative precipitation tank final outflow water COD concentration is 30～50mg/L, BOD
5concentration is 10～20mg/L, SS concentration is 10～25mg/L, ammonia nitrogen concentration is 1～5mg/L, total phosphorus concentration is lower than 1mg/L, meet " starch industry pollution discharge standard " the newly-built enterprise of table 2 water (GB25461-2010) completely and pollute direct emission limit requirement, adopt the wastewater effluent water quality of the present invention front and back to contrast in table 2.
Table 2 Guangxi tapioca (flour) factory adopts the outlet effect contrast of the present invention front and back
* " starch industry pollution discharge standard " (GB25461-2010) middle direct emission concentration limit value of table 2 newly-built enterprise water pollutant.
Claims (1)
1. wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment combination process, main technological steps is:
(1) cassava Cleaning Wastewater and manioc waste press filtration water is through grid filtration, settling pit precipitation, enters equalizing tank after removing cassava skin in waste water, manioc waste, silt;
(2) flash liberation waste water and secondary separation waste water enter after preliminary sedimentation tank is recycled lightweight starch and protein and also enter equalizing tank;
(3) add chemical agent to equalizing tank and regulate composite waste pH value and temperature;
(4) equalizing tank water outlet pumps into anaerobic baffled inner circulation reactor ABIC and carries out anaerobic reaction;
Anaerobic reaction complete after water outlet enter biological contact oxidation pond and carry out aerobic treatment;
(6) biological contact oxidation pond water outlet flows into coagulative precipitation tank, add flocculation agent and coagulant aids and fully stir after staticly settle, further remove after suspended substance, supernatant liquid can outside discharge up to standard or is back to production; It is characterized in that:
Adding chemical agent adjusting composite waste pH value to equalizing tank is 6～8, and temperature is 30～40 DEG C, and the hydraulic detention time of equalizing tank is 4h;
The temperature that anaerobic baffled inner circulation reactor ABIC carries out anaerobic reaction is 35 DEG C, and fluctuation is no more than 1 DEG C up and down; Guarantee in reactor that dissolved oxygen concentration is lower than 0.2mg/L; Hydraulic detention time is 12～48h;
In biological contact oxidation pond, aerating wastewater maintains dissolved oxygen concentration all the time higher than 2mg/L; Hydraulic detention time is 12～24h.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384306A (en) * | 2015-11-19 | 2016-03-09 | 上海纳米技术及应用国家工程研究中心有限公司 | Efficient sewage COD (chemical oxygen demand) treatment method |
| CN108947116A (en) * | 2018-07-04 | 2018-12-07 | 南阳市固德威机械装备有限公司 | A kind of potato starch waste water treatment process |
| CN111302569A (en) * | 2020-03-27 | 2020-06-19 | 广西绿蕊环保工程有限公司 | Cassava starch wastewater treatment device and method |
| CN111573891A (en) * | 2020-05-22 | 2020-08-25 | 中国环境科学研究院 | Sweet potato starch wastewater resource utilization process |
| CN115583743A (en) * | 2022-09-28 | 2023-01-10 | 烟台大学 | Treatment process of starch wastewater |
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| CN202594860U (en) * | 2012-04-28 | 2012-12-12 | 广西大学 | Anaerobic baffling internal circulation reactor |
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| CN202594860U (en) * | 2012-04-28 | 2012-12-12 | 广西大学 | Anaerobic baffling internal circulation reactor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384306A (en) * | 2015-11-19 | 2016-03-09 | 上海纳米技术及应用国家工程研究中心有限公司 | Efficient sewage COD (chemical oxygen demand) treatment method |
| CN108947116A (en) * | 2018-07-04 | 2018-12-07 | 南阳市固德威机械装备有限公司 | A kind of potato starch waste water treatment process |
| CN108947116B (en) * | 2018-07-04 | 2021-02-19 | 南阳市固德威机械装备有限公司 | Potato starch wastewater treatment process |
| CN111302569A (en) * | 2020-03-27 | 2020-06-19 | 广西绿蕊环保工程有限公司 | Cassava starch wastewater treatment device and method |
| CN111573891A (en) * | 2020-05-22 | 2020-08-25 | 中国环境科学研究院 | Sweet potato starch wastewater resource utilization process |
| CN111573891B (en) * | 2020-05-22 | 2021-06-25 | 中国环境科学研究院 | Sweet potato starch wastewater resource utilization process |
| CN115583743A (en) * | 2022-09-28 | 2023-01-10 | 烟台大学 | Treatment process of starch wastewater |
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