CN104030533B - Wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology - Google Patents

Wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology Download PDF

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CN104030533B
CN104030533B CN201410298850.4A CN201410298850A CN104030533B CN 104030533 B CN104030533 B CN 104030533B CN 201410298850 A CN201410298850 A CN 201410298850A CN 104030533 B CN104030533 B CN 104030533B
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abic
contact oxidation
biological contact
wastewater
water
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CN104030533A (en
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张立宏
张俊
曾广庆
赵侣璇
宋红军
徐以印
覃楠钧
宋晓薇
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Scientific Research Academy of Guangxi Environmental Protection
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Abstract

A kind of wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology, processing step is: Maninot esculenta crantz. cleans waste water and manioc waste filter pressing water through filtering precipitation, once all entering regulating reservoir adjustment pH value and temperature with after the recovered lightweight starch of secondary separation waste water and protein, successively enter ABIC again and biological contact oxidation pond carries out anaerobic treatment and Aerobic Process for Treatment, stand at coagulative precipitation tank, precipitation, remove impurity, the supernatant can qualified discharge or reuse; Carrying out the dissolved oxygen concentration of anaerobic reaction in ABIC lower than 0.2mg/L, hydraulic detention time is 12~48h; In biological contact oxidation pond, dissolved oxygen concentration is higher than 2mg/L, and hydraulic detention time is 12~24h. Use that this technology stable water outlet is up to standard, construction investment is little, operating cost is cheap, recyclable biomass energy, management simple, it is simple to through engineering approaches popularization and application, provide new technological approaches for tapioca industry waste water treatment.

Description

Wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology
Technical field
The invention belongs to industrial waste water treatment, particularly wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology.
Background technology
Tapioca industry Sewage Water Emissions amount is big, exist all the time cassava starch wastewater intractability greatly, costly, the not problem such as qualified discharge. 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 have to carry out table 2 more strict in this standard newly-built enterprise pollution discharge standard limit value, and the wastewater treatment level of tapioca industry be also been proposed higher requirement by this.
Wastewater from cassava starch production includes Maninot esculenta crantz. and cleans waste water, first separation waste water, secondary separation waste water and manioc waste filter pressing water etc. The main feature of wastewater from cassava starch production has: 1) wastewater through organic matter and SS content are high, and acid big, its COD concentration is generally greater than 10000mg/L, SS concentration and is about 3000mg/L, and pH value is 3~5; 2) cycling utilization of wastewater rate is low, thus causing the organic pollution amount of its discharge quite big, on average often produces 1 ton of starch discharge Organic substance 150~250kg; 3) wastewater biochemical process performance is good, and the value of BOD/COD is more than 0.6, and to adopting, microbial treatments are highly beneficial, particularly that producing methane through anaerobic fermentation is favourable; 4) containing SO in waste water4 2-With the harmful constituents such as CN-ion, microbial treatments are unfavorable.
Domestic wastewater from cassava starch production treatment technology having been carried out more research, current wastewater from cassava starch production processing method is more, is respectively arranged with pluses and minuses. Because wastewater from cassava starch production organic contamination substrate concentration is high, a kind of processing method is individually adopted to be difficult to reach emission limit requirement, so the combination of domestic and international commonly used kinds of processes processes wastewater from cassava starch production, process means substantially pretreatment+anaerobic technique+aerobic microorganisms group technology. Common pretreating process has natural sedimentation method, coagulant sedimentation; Anaerobic technique mainly has anaerobic jar, up-flow anaerobic sludge blanket (UASB), expanded granular sludge bed (EGSB), internal-circulation anaerobic reactor (IC) etc., and aerobic microorganisms mainly has aerobic activated sludge process, sequencing batch active sludge (SBR), biological contact oxidation process etc.
The process combination form that wastewater from cassava starch production built at present processes engineering employing 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, after combination of the above PROCESS FOR TREATMENT, water outlet can not stably reach emission limit requirement, running there is also many problems, the float contained in wastewater from cassava starch production is more, natural sedimentation method length consuming time, the removal ability of float is limited, inefficient; If directly wastewater from cassava starch production being carried out coagulating treatment, it is necessary to add substantial amounts of acid-base modifier and coagulated agent, processing cost is high; UASB is poor to the water treatment effect that suspension content is high, and impact resistance is strong, and the process of follow-up aerobic microbiological goes wrong to adopt the group technology of UASB usually to cause because UASB water outlet is not good, affects final outflow water water quality; The granule sludge of EGSB cultivates difficulty, start-up course length consuming time, runs difficulty higher; IC reactor cost is high, and medium-sized and small enterprises are difficult to bear; It is difficult that aerobic activated sludge process and SBR method excess sludge production are greatly, process is disposed, and easily occurs the problem that sludge bulking is floated in running, processes the automatic control equipment that during waste water, needs dependence is complicated, and maintenance management difficulty is higher. Comprehensive above reason, current group technology can not efficiently, stable, process wastewater from cassava starch production economically, be badly in need of the wastewater from cassava starch production process group technology of a set of standard water discharge of research, stable, cheap, 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, reactor has good hydraulics and the circulation stirring system without additionaling power, waste water and mud mixed effect can be improved, improve the capacity utilization in reactor, reaction efficiency and impact resistance, strengthen water treatment effect. The three phase separator simultaneously set in ABIC can effectively the biomass collection energy reduce sludge loss, reduction anaerobic effluent pollutant load further. Biological contact oxidation process relies on the microbial treatments waste water being attached on filler growth, each stage in reaction, in reactor, biofacies and waste water remain and are fully contacted, improve dissolution oxygen utilization rate and unit volume load, thoroughly improve aerobic activated sludge process and SBR method in precipitate phase waste water and the defect that mud mixed effect is poor, reaction efficiency is low, be greatly improved denitrification and the phosphor-removing effect of aerobic system.Additionally, biological contact oxidation process does not need complicated electronic auto-control equipment, it is not susceptible to sludge bulking, it is easy to operation management; After processing waste water, excess sludge generation amount is few, and excess sludge disposal costs is low. Coagulant sedimentation small investment, equipment is simple, and float treatment effect is good, and removal effect is stable, and operational management is convenient. Three of the above technique is combined, regulates the operational factor of each technique to realize having complementary advantages, be expected to create the process group technology 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 operational factor, water treatment effect is notable, the indices of discharge of wastewater is stably down in " starch industry pollution discharge standard " (GB25461-2010) table 2 newly-built enterprise, and water pollutes below direct emission limit, reclaim biomass energy simultaneously, construction investment is little, operating cost reduces, realize the doulbe-sides' victory of environmental benefit and economic benefit, and the wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology being easily managed.
The present invention solves above-mentioned technical problem with following technical scheme:
A kind of wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology, main technological steps is:
(1) Maninot esculenta crantz. cleans waste water and manioc waste filter pressing water through grid filtration, setting pot precipitation, enters regulating reservoir after removing the Maninot esculenta crantz. skin in waste water, manioc waste, silt;
(2) first separation waste water and secondary separation waste water enter preliminary sedimentation tank and recycle after lightweight starch and protein also into regulating reservoir;
(3) add chemical agent to regulating reservoir and regulate composite waste pH value and temperature;
(4) regulating reservoir water outlet pumps into anaerobic baffled inner circulation reactor ABIC and carries out anaerobic reaction;
(5) after anaerobic reaction completes, water outlet entrance biological contact oxidation pond carries out Aerobic Process for Treatment;
(6) biological contact oxidation pond water outlet flows into coagulative precipitation tank, staticly settles after adding flocculant and flocculation aid and being sufficiently stirred for, and after further removing float, the supernatant can outside discharge up to standard or be back to production;
It is characterized in that:
Adding chemical agent adjustment composite waste pH value to regulating reservoir is 6~8, and temperature is 30~40 DEG C, and the hydraulic detention time of regulating reservoir is 4h;
It is 35 DEG C that anaerobic baffled inner circulation reactor ABIC carries out the temperature of anaerobic reaction, fluctuates less than 1 DEG C up and down; Guarantee that in reactor, 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 and is consistently higher than 2mg/L; Hydraulic detention time is 12~24h.
The wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology of the present invention, when the organic volumetric loading of ABIC is in 8~15kgCOD/ (m3D), time, ABIC can more than 90% to the clearance of waste water COD; After whole group technology processes, the total removal rate of waste water COD is more than 99%, and water outlet COD value is less than 50mg/L. Stable water outlet is up to standard, construction investment is little, operating cost is cheap, recyclable biomass energy, management are simple, it is simple to through engineering approaches popularization and application, provides new technological approaches for tapioca industry waste water treatment.
Accompanying drawing explanation
Fig. 1 is the process chart 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 concentration change 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 concentration change and COD clearance graph of a relation. Owing in water outlet, COD concentration is almost nil, therefore cannot represent in the drawings.
Detailed description of the invention
The basic ideas of the present invention are: wastewater from cassava starch production is after pretreatment, process device A BIC initially with efficient anaerobe and it is carried out anaerobic treatment, reclaim biomass energy simultaneously, then ABIC water outlet is carried out Aerobic Process for Treatment by recycling high-efficiency aerobic biological treating equipment biological contact oxidation pond, finally uses materializing strategy equipment coagulative precipitation tank to remove the suspended material in biological contact oxidation pond water outlet.
It is as follows that what the present invention adopted is embodied as step:
1) the cleaning waste water of the Maninot esculenta crantz. in tapioca production process and manioc waste filter pressing water first pass through grid filtration, remove bulk Maninot esculenta crantz. skin, manioc waste, then setting pot precipitation is flowed into, setting pot hydraulic detention time is 10min, removed the material of the easily sedimentation such as the little granule Maninot esculenta crantz. skin in waste water, manioc waste, silt by gravity natural sedimentation, water outlet enters regulating reservoir;
2) first separation waste water and secondary separation waste water enter preliminary sedimentation tank precipitation, hydraulic detention time is 1h, and deposit main component is lightweight starch and protein, can be recovered utilization, water outlet enters regulating reservoir, and this step can remove COD and the float of about 30%;
3) water outlet of step 1 and step 2 enters regulating reservoir mix and blend, adds chemical agent and regulates composite waste pH value to 6~8, and suitably heating composite waste is so as to temperature is promoted to 30~40 DEG C, and the hydraulic detention time of regulating reservoir is 4h;
4) step 3 water outlet is pumped into ABIC and carry out anaerobic reaction, different according to water inlet organic contamination substrate concentration, hydraulic detention time is set to 12~48h, maintaining temperature in ABIC is 35 DEG C, fluctuate less than 1 DEG C up and down, guarantee that in reactor, dissolved oxygen concentration is lower than 0.2mg/L, strict anaerobic environment is created for anaerobic reaction, it is beneficial to reaction efficiently to carry out, this step can remove the COD of about 90% in water inlet, and producing large number of biological mass-energy source biogas, methane content of bilogas is higher than 50%, can comprehensively utilize after collecting;
5) step 4 water outlet is introduced biological contact oxidation pond, aerating wastewater in pond is maintained dissolved oxygen concentration and is consistently higher than 2mg/L, arranging hydraulic detention time is 12~24h, it is ensured that waste water and biofilm contact carry out abundant aerobic reaction, the COD of more than 90% in degradable water inlet;
6) step 5 water outlet flows into coagulative precipitation tank, add flocculant poly aluminum chloride 1~2g/L and flocculation aid polyacrylamide 1~3mg/L, staticly settle after being sufficiently stirred for, hydraulic detention time is 1~2h, the outside environmental emission of the supernatant or be back to production after precipitation, precipitate can agricultural or outward transport landfill disposal after concentration, dehydration.
When the organic volumetric loading of ABIC is in 8~15kgCOD/ (m3D), time, ABIC can more than 90% to the clearance of waste water COD; After whole group technology processes, the total removal rate of waste water COD is more than 99%, and water outlet COD value is less than 50mg/L.
The Inlet and outlet water COD situation of change of experimental stage ABIC steady operation period and COD clearance are shown in Fig. 2, and as shown in Figure 2, when inlet COD concentration is 15000~18000mg/L, the COD clearance of ABIC can be stably maintained at more than 90%. Inlet and outlet water situation and the COD clearance of experimental stage group technology stable operation are shown in Fig. 3, from the figure 3, it may be seen that when inlet COD concentration is 15000~18000mg/L, the COD clearance of process combination can maintain more than 99%.
It is described specifically below in conjunction with embodiment.
Embodiment 1
Guangxi tapioca factory former employing UASB-activated sludge process-Coagulation Method group technology process for producing waste water, producing waste water effluent COD concentration after treatment is 100~200mg/L, BOD5Concentration 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 the direct emission limit requirement of table 2 in " starch industry pollution discharge standard " (GB25461-2010).
Adopt ABIC-of the present invention biological contact oxidation process-combined coagulant technology technique that this factory production waste water is processed, waste water and manioc waste filter pressing water will be cleaned through the pretreated Maninot esculenta crantz. of grid and setting pot, enter regulating reservoir mix and blend respectively through the pretreated first separation waste water of preliminary sedimentation tank and secondary separation waste water, regulate composite waste pH value to 6~8, temperature is to 30~32 DEG C. Regulating reservoir water outlet pumps into ABIC, and maintaining temperature in ABIC is 35 DEG C, sets hydraulic detention time as 36h, makes anaerobe in waste water and reactor carry out abundant anaerobic reaction. ABIC water outlet introduces biological contact oxidation pond, and in pond, aeration is to keep dissolved oxygen to be in more than 2mg/L, and hydraulic detention time is set to 24h, makes waste water carry out abundant aerobic reaction with aerobic microbiological in pond. Biological contact oxidation pond water outlet flows in coagulative precipitation tank, adds flocculant poly aluminum chloride 1.8g/L, flocculation aid polyacrylamide 2mg/L, staticly settles after being sufficiently stirred for mixing, and hydraulic detention time is set to 1h. Coagulative precipitation tank final outflow water COD concentration is 20~40mg/L, BOD5Concentration is 5~15mg/L, SS concentration is 10~20mg/L, ammonia nitrogen concentration, lower than 2mg/L, fully meets the direct emission limit requirement of table 2 of " starch industry pollution discharge standard " (GB25461-2010), adopts the wastewater effluent water quality before and after the present invention to contrast in Table 1.
Table 1 Guangxi tapioca factory adopts outlet effect contrast before and after the present invention
Numbering Project Before adopting the present invention After adopting 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 COD (CODcr) 100~200mg/L 20~40mg/L ≤100mg/L
4 Five-day BOD (BOD5) 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
* the direct concentration of emission limit value of table 2 newly-built enterprise water pollutant in " starch industry pollution discharge standard " (GB25461-2010).
Embodiment 2
Guangxi tapioca factory former employing UASB-SBR method group technology process for producing waste water, producing waste water effluent COD concentration after treatment is 80~150mg/L, BOD5Concentration is 10~30mg/L, SS concentration is 10~20mg/L, and ammonia nitrogen concentration is 5~10mg/L, and total phosphorus concentration is 4~8mg/L, COD, BOD5, total phosphorus aqueous concentration all can not stably reach the direct emission limit requirement of table 2 in " starch industry pollution discharge standard " (GB25461-2010).
Adopt ABIC-of the present invention biological contact oxidation process-combined coagulant technology technique that wastewater from cassava starch production is processed, waste water and manioc waste filter pressing water will be cleaned through the pretreated Maninot esculenta crantz. of grid and setting pot, enter regulating reservoir mix and blend respectively through the pretreated first separation waste water of preliminary sedimentation tank and secondary separation waste water, regulate composite waste pH value within 6~8, temperature is to 38~40 DEG C. Regulating reservoir water outlet pumps into ABIC, and maintaining temperature in ABIC is 35 DEG C, sets hydraulic detention time as 36h, makes anaerobe in waste water and reactor carry out abundant anaerobic reaction.ABIC water outlet introduces biological contact oxidation pond, and in pond, aeration is to keep dissolved oxygen to be in more than 2mg/L, and hydraulic detention time is set to 24h, makes waste water carry out abundant aerobic reaction with aerobic microbiological in pond. Biological contact oxidation pond water outlet flows in coagulative precipitation tank, adds flocculant poly aluminum chloride 1.6g/L, flocculation aid polyacrylamide 1mg/L, staticly settles after being sufficiently stirred for mixing, and hydraulic detention time is set to 2h. Coagulative precipitation tank final outflow water COD concentration is 30~50mg/L, BOD5Concentration 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, the table 2 newly-built enterprise water fully meeting " starch industry pollution discharge standard " (GB25461-2010) pollutes direct emission limit requirement, adopts the wastewater effluent water quality before and after the present invention to contrast in Table 2.
Table 2 Guangxi tapioca factory adopts outlet effect contrast before and after the present invention
* the direct concentration of emission limit value of table 2 newly-built enterprise water pollutant in " starch industry pollution discharge standard " (GB25461-2010).

Claims (1)

1. wastewater from cassava starch production ABIC-biological contact oxidation process-coagulating treatment group technology, adopts pretreatment+anaerobic technique+aerobic microorganisms technique, and main technological steps is:
(1) wastewater from cassava starch production enters regulating reservoir after filtering, precipitating;
(2) add chemical agent to regulating reservoir and regulate composite waste pH value and temperature;
(3) regulating reservoir water outlet pumps into anaerobic baffled inner circulation reactor ABIC and carries out anaerobic reaction;
(4) after anaerobic reaction completes, water outlet entrance biological contact oxidation pond carries out Aerobic Process for Treatment;
(5) biological contact oxidation pond water outlet flows into coagulative precipitation tank, staticly settles after adding flocculant and flocculation aid and being sufficiently stirred for, and after further removing float, the supernatant can outside discharge up to standard or be back to production;
It is characterized in that:
Maninot esculenta crantz. cleans waste water and manioc waste filter pressing water through grid filtration, setting pot precipitation, enters regulating reservoir after removing the Maninot esculenta crantz. skin in waste water, manioc waste, silt; First separation waste water and secondary separation waste water enter preliminary sedimentation tank and recycle after lightweight starch and protein also into regulating reservoir;
Adding chemical agent adjustment composite waste pH value to regulating reservoir is 6~8, and temperature is 30~40 DEG C, and the hydraulic detention time of regulating reservoir is 4h;
It is 35 DEG C that anaerobic baffled inner circulation reactor ABIC carries out the temperature of anaerobic reaction, fluctuates less than 1 DEG C up and down; Guarantee that in reactor, 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 and is consistently higher than 2mg/L; Hydraulic detention time is 12~24h.
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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
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
CN111573891B (en) * 2020-05-22 2021-06-25 中国环境科学研究院 Sweet potato starch wastewater resource utilization process

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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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厌氧-好氧-物化组合工艺处理木薯淀粉废水;韩彪等;《广西科学院学报》;20111130;第27卷(第4期);第348-350,354页 *

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