CN100371270C - Combined treatment process for manioc producing effluent - Google Patents
Combined treatment process for manioc producing effluent Download PDFInfo
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- CN100371270C CN100371270C CNB2005101131542A CN200510113154A CN100371270C CN 100371270 C CN100371270 C CN 100371270C CN B2005101131542 A CNB2005101131542 A CN B2005101131542A CN 200510113154 A CN200510113154 A CN 200510113154A CN 100371270 C CN100371270 C CN 100371270C
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Abstract
The present invention discloses a biological treatment combined technique for cassava starch production wastewater. (1). cassava starch production wastewater comprises original cassava washing water, primary starch separating washing wastewater, quadric starch separating washing wastewater, modified starch wastewater and cassava alcohol production wastewater, part of the cassava starch production wastewater needs to be pretreated, and part of the cassava starch production wastewater directly enters an adjusting pool; (2). after the pH value of the cassava starch production wastewater is adjusted, the cassava starch production wastewater can directly enter an anaerobic biological treatment system, per kg COD is degraded in the reactor, and marsh gas about 0.35 cubic meters can be recovered; (3). after outflow water after anaerobic biological treatment is treated in a sedimentation mode, the outflow water enters an aerobic biological reaction pool; (4). a COD content of the final outflow water of the biological treatment combined technique is below 100mg/L, which achieves the country level discharge standard. The present invention has the advantages of simple technique, good treatment effect and low comprehensive cost. A biomass energy source can be simultaneously recovered in the process of wastewater treatment, and sustainable development is indeed realized.
Description
Technical field
The present invention relates to waste water treatment process, mainly is the treatment process that is used for handling the high concentrated organic wastewater that the tapioca (flour) production process produced.
Background technology
Wastewater from cassava starch production is rich in albumen and amino acid, and COD concentration can be up to 10000mg/L in the isolating waste water of tapioca (flour), but has good biodegradability (B/C＞0.5).With short production cycle owing to tapioca (flour), the waste water generation is very big, the high and reason such as acidifying very easily of organic contamination substrate concentration in the waste water, and the processing of wastewater from cassava starch production is remained a very thorny difficult problem.At present, the wastewater from cassava starch production treatment process has both at home and abroad:
1) chemical flocculation precipitation method
Adopt the chemical flocculation precipitation method to handle tapioca (flour) waste water, COD and suspended substance there is removal effect preferably, but water outlet COD is still higher, and wastewater from cassava starch production is easily by acidifying, the chemical flocculation precipitation method needs to regulate earlier the pH value, therefore the expense of required medicament is big, and the technology popularization difficulty is bigger.
2) anaerobic biological treatment
Anaerobic Microbiological Treatment Technology is considered to the wastewater processing technology of low-consumption high-efficiency; the wastewater from cassava starch production biodegradability is relatively good; be suitable for recycling the renewable energy resources wherein, quite be subjected to environment protection expert's concern in recent years, outside the district, successful case history has been arranged.
3) miscegenation fermentation method
This method is to utilize the organism in the tapioca (flour) waste water to cultivate single cell protein, makes the depleted resource can access recycling, to reduce the expense of handling waste water.This technology can make the COD clearance reach more than 60%, thalline productive rate 15 grams per liters, and tropina content is more than 50%.But this processing requirement is selected special bacterial classification for use, and running cost is higher relatively.
4) stabilization pond technology
This is the method that the most generally adopts at present in the district of Guangxi, and wastewater from cassava starch production is stored in the sizable stabilization pond of scale, under field conditions (factors) by anaerobism, aerobe reaction, makes the organic pollutant in the waste water obtain degraded.This method not only need the clearance of big area land occupation, pollutent low again and also make because of proteinic corruption in the waste water is smelly near air be subjected to serious pollution, annual because foul smell influences problem and causes the resident to be reflected strongly.
Summary of the invention
The objective of the invention is to develop that technology is simple, treatment effect good, comprehensive cost is low, realize the wastewater from cassava starch production treatment process of environmental benefit and economic benefit harmony.
The kind of waste water of tapioca (flour) manufacturing enterprise generally comprises: former cassava washing water, starch separating, washing waste water, secondary starch separating, washing waste water, modified starch waste water, cassava (slag) Alcohol Production waste water.Wherein the washes of former cassava repeats reuse as far as possible, and secondary starch separating, washing waste water and cassava alcohol factory effluent all need to carry out pre-treatment, and all waste water can enter biochemical treatment after mixing adjusting.
Basic ideas of the present invention are: adopt the organic pollutant in the method degrading cassava starch factory effluent of low-consumption high-efficiency, simultaneously the available resources in the waste water are comprehensively reclaimed and utilize.Dominant technology of the present invention belongs to biological method.Employing is based on the biologic treating technique of efficient anaerobic and high-efficiency aerobic, and appropriate design becomes best combination process.
Concrete steps are as follows:
Cassava rinse water in the tapioca (flour) production enters primary sedimentation basin remove most of silt particle after, be recycled and be used for cassava and clean, have only when the COD concentration in the waste water reach 1000mg/L or higher after, enter the homogeneous equalizing tank again.
Once washing separates waste water and modified starch production waste water directly enters equalizing tank.
Secondary washing is separated waste water and is introduced into air flotation pool, separates and removes residual starch granules in the waste water, removes the COD of about 40-60% in the waste water simultaneously, and its water outlet enters equalizing tank again.
Alcohol Production waste water is removed wherein most of manioc waste that suspends and is entered equalizing tank later on more earlier through filter screen, and manioc waste is after treatment as feed.
All kinds of factory effluents enter efficient anaerobic, high-efficiency aerobic bioreactor for treatment successively behind the equalizing tank homogeneous, the biogas of generation is fully utilized, and enter surface water body or comprehensive utilization after water outlet is up to standard.
The main design parameters of this technology is as follows:
The pretreated hydraulic detention time of starch separated secondary washes is 2 to 3 hours, and most of residual starch of removing in the waste water gets final product;
The cassava alcohol factory effluent is selected 120 to 200 purpose drum-type stainless steel filtering nets, and the SS value that as far as possible makes waste water is less than 100mg/L.
The hydraulic detention time of homogeneous equalizing tank is selected about 2 to 4 hours, to prevent the undue acidifying of waste water.For homogenizing water quality, in equalizing tank, can establish whipping appts or aeration agitation system.
Waste water enters before the anaerobic biological reactor, must carry out the pH value and regulate, and makes the pH value of waste water reach 5 to 8 scope.
The hydraulic detention time of anaerobic biological reactor is designed to 16 to 24 hours, and key is that intrasystem current lift velocity is wanted choose reasonable.
Water outlet after the anaerobic treatment must be carried out mud-water separation, and the part granule sludge refluxes and to enter anaerobic biological reactor, and the part excess sludge enters sludge thickener or the export trade kind mud as granule sludge.The hydraulic detention time of settling tank is designed to 2 to 3 hours.
The hydraulic detention time of aerobe reactor is designed to 8 to 12 hours.
All excess sludges through concentrating, outward transport is perhaps implemented landfill disposal as fertilizer after the processed.
Treatment effect:
In the stage of small-scale test system stable operation, anaerobic biological reactor can surpass 90% to the maximum material removal rate of waste water COD, and organic volumetric loading can reach 14kg.COD/ (m
3.d), water outlet COD remains on below the 2000mg/L more, has created good condition for follow-up aerobic biological treatment process is up to standard smoothly.
The operating performance of total system is fairly good, and this combination process can not only bear the impact of higher Pollutant levels of wastewater from cassava starch production and load.When the COD concentration of mixing tapioca (flour) waste water is 5000-7000mg/L, former water pH value is not regulated under the situation of (about 5), through after the processing of this combination process, total clearance of waste water COD is greater than 98%, the COD value of its water outlet is many less than 100mg/L, has reached the primary standard of integrated wastewater discharge standard.
The present invention has following characteristics:
1. in steady operation period, it is (5200～8100) mg/l that the efficient anaerobe treatment system allows the variation range of water inlet COD concentration, and the water inlet organic loading is (9.2～14.14) kg.COD/ (m
3.d), hydraulic detention time is less than 24 hours, and at this moment, anaerobic biological reactor reaches 74.6% to the average removal rate of COD.
2. this combination process can be handled wastewater from cassava starch production in stability and high efficiency ground, system also can bear wastewater from cassava starch production Pollutant levels height fully, the water yield changes influence greatly, during this combination process steady running, the clearance of waste water COD reaches as high as more than 98%, and effluent quality can reach the comprehensive discharge primary standard.
3. adopt this combination process, the every removal of anaerobic system 1kgCOD can produce 0.35m
3Methane gas.And methane gas acts as a fuel to use and just can replace raw coal, calculates according to the heat such as grade, and the profit of 1 ton of wastewater from cassava starch production of every processing can reach about 2 yuan.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Fig. 2 is the Inlet and outlet water COD variation diagram of steady operation period treatment system of the present invention.
Fig. 3 is the graph of a relation of anaerobic biological reactor water inlet COD and its clearance.
Embodiment
Cassava rinse water in the tapioca (flour) production enters primary sedimentation basin remove most of silt particle after, be recycled and be used for cassava and clean, when COD concentration is near 1000mg/L in the waste water, enter the homogeneous equalizing tank.
The tapioca (flour) once washing separates waste water and modified starch production waste water directly enters equalizing tank.
The tapioca (flour) secondary washing is separated waste water and is at first adopted the air flotation pool pre-treatment, separates and removes residual starch granules in the waste water, and 60% COD is removed in the waste water, and its water outlet enters equalizing tank.
Alcohol Production waste water removes slag through precipitation, and the supernatant liquor of getting in the settling tank is handled, and the SS value that as far as possible makes waste water is less than 100mg/L.According to the common practices in Alcohol Production workshop, produce the later manioc waste of alcohol and can make the domestic animal feed.
The hydraulic detention time of various waste water mixing equalizing tanks is 4 hours, to prevent the undue acidifying of waste water.For the water quality of the former water of homogenizing, in equalizing tank, adopt aeration agitation.The pH value of system's initial start stage waste water is adjusted to about 7.5, after system's operation is normal, just can directly enter reactor for treatment as long as the pH value of waste water reaches about 5.5; Mix the back factory effluent and enter efficient anaerobic, high-efficiency aerobic bio-reactor successively.Wherein, the hydraulic detention time of anaerobic biological reactor is designed to 22 hours; Mud-water separation is carried out in water outlet after the anaerobic biological treatment, and the part granule sludge refluxes and enters anaerobic biological reactor; The hydraulic detention time of aerobe reactor is designed to 12 hours.
All excess sludges are through concentrating, transporting outward landfill disposal after the processed; Methane content reaches 54% in the biogas that produces, and can be fully utilized; Handle back water outlet COD content and reach first discharge standard.
In the stage of pilot system steady running, anaerobic biological reactor can surpass 90% to the clearance of waste water COD, and organic volumetric loading is up to 14kgCOD/ (m
3.d); After total system was handled, total clearance of waste water COD was all greater than 98%.The COD concentration of mixing tapioca (flour) waste water is 5000mg/L to 7000mg/L.After the processing of this combination process, the COD value of its water outlet is many less than 100mg/L.
The Inlet and outlet water COD changing conditions of steady operation period UASB is seen Fig. 2, and the relation of water inlet COD of system and clearance is seen Fig. 3.
Claims (1)
1. the combination process of a wastewater from cassava starch production biological treatment is characterized in that the steps include:
Cassava rinse water in the tapioca (flour) production enters primary sedimentation basin remove most of silt particle after, be recycled and be used for cassava and clean, have only the COD content 〉=1000mg/L in waste water to enter the homogeneous equalizing tank again;
Once washing separates waste water and modified starch production waste water directly enters equalizing tank;
Secondary washing is separated waste water and is introduced into air flotation pool, separates and removes residual starch granules in the waste water, remove the COD of 40-60% in the waste water simultaneously after, water outlet enters equalizing tank again;
Alcohol Production waste water is earlier through filter screen; Remove wherein most of manioc waste that suspends and enter equalizing tank later on again; The hydraulic detention time of homogeneous equalizing tank is 2 to 4 hours, establishes whipping appts or aeration agitation system in equalizing tank; Carry out the pH value then and regulate, make the pH value of waste water reach 5 to 8;
All kinds of factory effluents enter efficient anaerobic, high-efficiency aerobic bioreactor for treatment successively behind the equalizing tank homogeneous, the hydraulic detention time of anaerobic biological reactor is designed to 16 to 24 hours; Mud-water separation is carried out in water outlet after the anaerobic treatment, and the part granule sludge refluxes and to enter anaerobic biological reactor, and the part excess sludge enters sludge thickener or export trade as granule sludge kind mud; The hydraulic detention time of settling tank is designed to 2 to 3 hours; The hydraulic detention time that aerobe is handled is 8 to 12 hours;
All excess sludges through concentrating, outward transport is perhaps implemented landfill disposal as fertilizer after the processed; The biogas that produces is fully utilized, and enters surface water body or comprehensive utilization after water outlet is up to standard.
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| CN101586123B (en) * | 2008-05-22 | 2013-01-30 | 中粮集团有限公司 | Method for preparing ethanol by adopting yam materials |
| CN101676396B (en) * | 2008-09-19 | 2013-03-06 | 中粮集团有限公司 | Method for preparing alcohol by utilizing potato materials |
| CN101823816B (en) * | 2010-05-05 | 2011-08-31 | 天津大学 | Aerobic sludge zero discharge technology in potato alcohol wastewater treatment process |
| CN101891338B (en) * | 2010-06-30 | 2012-05-09 | 潍坊盛泰药业有限公司 | Waste water treatment method in starch and glucose production |
| CN101875527B (en) * | 2010-07-16 | 2011-09-28 | 天津大学 | High-efficiency treatment method of potato alcohol wastewater |
| CN102174588B (en) * | 2011-03-04 | 2012-12-12 | 南阳天冠生物发酵有限公司 | Methane production method by adopting cellulosic ethanol byproduct as main raw material |
| CN102318807B (en) * | 2011-05-11 | 2015-12-02 | 邹光友 | A kind of processing method of starch from sweet potato cleanly production |
| CN102249498B (en) * | 2011-07-13 | 2012-09-05 | 华北水利水电学院 | Biochemical treatment method for waste water from small and medium-sized starch factories |
| CN103159371A (en) * | 2011-12-09 | 2013-06-19 | 青岛科技大学 | Combined process for treating production wastewater of modified starch |
| CN102586336B (en) * | 2012-03-06 | 2013-12-25 | 广西武鸣县安宁淀粉有限责任公司 | Two-stage conversion method for producing bio-methane |
| CN102690024A (en) * | 2012-06-13 | 2012-09-26 | 西北师范大学 | Purification treatment method of red clover fresh grass preprocessing waste water |
| CN104709731B (en) * | 2015-02-13 | 2017-02-01 | 河南天冠企业集团有限公司 | Cassava raw material dust-free unloading and preprocessing method |
| CN108483803A (en) * | 2018-03-28 | 2018-09-04 | 广西金茂生物化工有限公司 | A method of handling cassava alcohol waste water using micro electrolysis tech |
| CN111233261A (en) * | 2020-01-20 | 2020-06-05 | 轻工业环境保护研究所 | Treatment technology of potato starch production wastewater |
| 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 |
| CN114538695B (en) * | 2020-11-24 | 2024-05-24 | 山东福洋生物科技股份有限公司 | Method for treating modified starch industrial wastewater by utilizing microorganisms |
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Patent Citations (4)
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|---|---|---|---|---|
| CN1226519A (en) * | 1998-02-19 | 1999-08-25 | 吴家模 | Method and apparatus for recovering and using wastewater from water-milled rice flour |
| CN1304886A (en) * | 2001-02-21 | 2001-07-25 | 广西必佳微生物工程有限责任公司 | Composite microbe process for treating high-concentration organic sewage |
| CN1432541A (en) * | 2002-01-15 | 2003-07-30 | 田永元 | Leftover processing process and apparatus for sweet potato after producing starch |
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