CN1896737A - Biochemical-performance evaluation of industrial waste water - Google Patents
Biochemical-performance evaluation of industrial waste water Download PDFInfo
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Abstract
A estimation method of the biotransformation of industrial sewage, it relates to a estimation method of the biotransformation of waste water in sewage treatment. To solve the problem that the measurement error because of high-power diluting and the measure period is too long in the present measurement, the invention using the dissolve oxygen detecting instrument detect the endogenous respiration oxygen consumption and the biochemical breath oxygen consumption of industrial sewage, estimating the biotransformation of industrial sewage according to the relative oxygen consumption: when the water sample waiting for measuring ROC> 1, explaining that the base material does not poison or inhibit the action of the microorganism, the bigger the ROC value is the better the biotransformation of waste water waste is; When the water sample waiting for measuring ROC <1, explaining that base material poisons or inhibits the action of the microorganism, the smaller the ROC value is the stronger the toxicity of the waste water is, the worse the biotransformation of waste water waste is. The invention uses a method by detecting the oxygen consumption rate of microorganism, can detect the impact of different waste water thickness to the action of the microorganism, it avoids the error of high power dilution; and the method is simple, rapid, it can gain the measurement result in 30 ~ 60 min.
Description
Technical field
The present invention relates to the evaluation method of wastewater biodegradability in a kind of wastewater treatment.
Background technology
China's contaminated wastewater is mainly organic contamination at present, and this has determined most wastewater treatments all will adopt biological treatment as the main body treatment process.And adopt biological treatment that wastewater biodegradability is had certain requirement, and if wastewater biodegradability is strong, the waste water easily biological-degradable being described, waste water can directly adopt biological treatment; If wastewater biodegradability is poor, the waste water difficult for biological degradation is described, waste water can not directly adopt biological treatment, therefore determines wastewater biodegradability, and is significant to the selection of waste water treatment process.
The index of measurement Biodegradability of Wastewater commonly used has BOD at present
5/ COD, BOD
5/ TOD, BOD
5/ TOC etc., wherein BOD
5/ COD is the most commonly used at present as the wastewater biodegradability evaluation index.These indexs all adopt BOD
5Estimate the quantity of bio-degradable material in the waste water, BOD
5The standard method of measuring is the dilution inocalation method.
BOD
5The full name five-day BOD refers under 20 ℃ of water temperatures, five days condition of cultivation the amount of the dissolved oxygen DO that organism consumed in the microorganism decomposition water.Because organic content is higher in the industrial waste water, water sample is subjected to the restriction of saturation dissolved oxygen to be provided sufficient dissolved oxygen by organism decomposes, thereby need dilute the back to water sample for industrial waste water and measure, the extension rate of the high more employing of the concentration of waste water is big more.
Adopt BOD
5/ COD weighs the biodegradability of waste water, BOD
5The high more wastewater biodegradability of/COD ratio is good more, and the low more wastewater biodegradability of ratio is poor more; It is generally acknowledged BOD
5/ COD 〉=0.4, wastewater biodegradability is better, can carry out a biological disposal upon BOD
5/ COD＜0.4 wastewater biodegradability is relatively poor, should not carry out a biological disposal upon.
Along with the development of modern industrial technology, increasing hard-degraded substance and toxic material enter in the waste water, and the concentration of industrial waste water is more and more higher, and composition is increasingly sophisticated, original BOD
5/ COD can not satisfy the requirement of current wastewater processing technology as the evaluation index of wastewater biodegradability, therefore is necessary to develop quick, easy, the evaluation method of industrial waste water biodegradability accurately.
The evaluation method of the most frequently used wastewater biodegradability is BOD in the wastewater treatment at present
5Two problems below/COD ratioing technigue, this method exist in the engineering application process.
1, ignored the influence of waste strength to wastewater biodegradability:
Adopt this evaluation method more suitable for the lower industrial waste water of sanitary sewage or toxicant and inhibiting substances content.But for the toxic indegradable industrial effluent of high concentration, BOD
5/ COD evaluation index is the biodegradability of reaction waste well, adopts that this evaluation method error is very big also may to draw antipodal wrong conclusion.
With the nitro wastewater from chemical industry is example, contains nitrobenzene in the waste water, to multiple toxic biodegradable organic compoundses such as nitro ethylbenzene, nitrotoluene, chlorobenzenes, and waste water COD is 11500mg/L, BOD
5Be 4715mg/L, the BOD of waste water
5/ COD ratio is 0.41.Single from BOD
5Can think on/COD the numerical value that this waste water can biodegrade; adopt biological treatment can obtain higher removal efficient; but in fact this wastewater toxicity is very strong; nitrobenzene is one of 58 kinds of objectionable impuritiess of optimal control in the China environmental protection; hydrobiont had very strong toxicity; nitrobenzene compounds can't directly adopt biological treatment up to 1000mg/L at all in the actual measurement waste water.The reason that produces this phenomenon is:
(1) more or less exist poisonous or objectionable impurities in the industrial waste water, microbial growth is all had certain inhibiting effect, the concentration of poisonous and harmful substance is high more, and inhibiting effect is also strong more.Also have a lot of organism when low concentration, can be utilized, when high concentration, then microorganism is had inhibiting effect by microorganism.As adopt dilution method to measure BOD
5Then ignored inhibiting effect.
(2) height of organic concentration directly influences the wear rate of biodegradation process oxygen, and under the very low situation of substrate concentration, its oxygen consumption rate is directly proportional with the first power of organic substrates concentration, but the raw sewage substrate concentration will not exclusively change by this rule when higher.Therefore, the BOD that under diluted state, measures
5Can not accurately represent the BOD of raw sewage
5
In the above-mentioned test according to BOD
5The standard method of measuring determines that at first three dilution ratios are respectively 2500 times, 1725 times, 850 times.Nitro phenenyl concentration (in concentration 1000mg/L in the former water) is respectively 0.4mg/L, 0.6mg/L, 1.2mg/L in the water sample of dilution back, all less than the 2.0mg/L of " integrated wastewater discharge standard (GB8978-1996) " primary standard regulation, can think behind the dilution for many times that nitro phenenyl concentration is less to the microbial activity influence in the water sample, can not represent the raw wastewater biochemical characteristic.
Therefore, for high-concentration industrial-water, adopt the dilution for many times method to measure BOD
5Or differentiate the biodegradability of sewage with it, and the result under diluted state all can only be described, can not represent the character of raw sewage, BOD
5/ COD index has ignored that pollutant levels are to the influence of biodegradability in the waste water, and error is bigger in the use, represents that with this result the biochemical characteristic of high-concentration sewage water quality is not entirely true.
2, measure excessive cycle:
BOD
5Begin to need five days time from mensuration to obtaining a result, the excessive cycle of mensuration, in the face of sewage quality complicated and changeable, original assay method can't in time instruct engineering practice, brings constant for the operational management of sewage treatment facility.
Waste water hard-degraded substance content height, bio-toxicity is big, the inhibiting substances reasons that all may become the wastewater biochemical difference that wait more.BOD
5Can think that the biodegradability of waste water is poor when/COD ratio is low, but can't explain the generation reason of biodegradability difference.Address the above problem, must the new wastewater biodegradability evaluation method of exploitation.
Summary of the invention
In order to solve current assay method because of dilution for many times error at measurment of bringing and the problem of measuring excessive cycle, the invention provides a kind of evaluation method of industrial waste water biodegradability, this method adopts microorganism oxygen consumption rate determination method, can measure of the influence of different waste strengths, the error of avoiding dilution for many times to bring to microbial activity; And method is simple, quick, and 30min～60min can obtain measurement result.
Foregoing invention purpose of the present invention is implemented by following technical solution: one, measure endogenous respiration oxygen consumption rate and wastewater biochemical and breathe oxygen consumption rate: adopt dissolved oxygen meter to measure the biochemical respiration oxygen consumption of endogenous respiration oxygen utilization and industrial waste water, draw wastewater biochemical respiratory line and endogenous respiration line; Two, adopt relative oxygen utilization to estimate the biodegradability of industrial waste water: the wastewater biochemical respiration oxygen consumption is called relative oxygen utilization ROC with the ratio of endogenous respiration oxygen utilization, if water sample ROC to be measured＞1, biochemical respiratory rate is greater than endogenous respiration speed, illustrate that matrix do not poison inhibiting effect to microorganism, the big more wastewater biodegradability of ROC value is good more; Otherwise if water sample ROC to be measured＜1, biochemical respiratory rate illustrates matrix to the toxic inhibiting effect of microorganism less than endogenous respiration speed, and the more little wastewater toxicity of ROC value is strong more, and wastewater biodegradability is poor more.
Principle of work of the present invention: a certain amount of active sludge is mixed with waste water, under constant-temperature enclosed condition, the aerobic microbiological decomposition utilizes the organism in the waste water to carry out metabolic response, dissolved oxygen DO in the continuous consume water of metabolic process, the oxygen utilization of microbial metabolism can be measured by dissolved oxygen meter.
The dissolved oxygen DO that is consumed in the organic substance metabolism process of microbial degradation comprises two parts: the one, and the oxygenolysis organic contaminant makes it be decomposed into CO
2, H
2O etc. are for synthetic cell provides energy; The 2nd, carry out endogenous respiration for microorganism, make the cellular material oxygenolysis.Microorganism carries out the aerobic speed of substance metabolism process and can represent with following formula:
The oxygen consumption rate of the oxygen consumption rate+endogenous respiration of total oxygen consumption rate=synthetic cell.
If the component of sewage is to growth of microorganism nonhazardous effect, utilized by microorganism easily, microorganism and the synthetic new cell of huge uptake organism immediately after sewage mixes consume oxygen in water simultaneously, and the oxygen utilization that record this moment should be greater than the oxygen utilization of endogenous respiration.As containing the material that microorganism is suppressed or poisons in the sewage, microbial degradation utilizes organic speed to slow down or to stop, and causes the oxygen consumption rate that the records oxygen consumption rate less than endogenous respiration.
The wastewater biochemical respiration oxygen consumption is called relative oxygen utilization ROC with the ratio of endogenous respiration oxygen utilization, can adopt relative oxygen utilization ROC to differentiate the biodegradability of waste water by the biochemical respiratory rate and the endogenous respiration speed of test determination active sludge.The present invention proposes the relative oxygen utilization ROC of 30min
30As the evaluation index of industrial waste water biodegradability, be particularly useful for toxicity or the higher industrial waste water of inhibitory substance content.The present invention has following advantage:
1, can understand the influence of pollutant levels to wastewater biodegradability:
Similar contaminated wastewater substrate concentration difference, its influence to wastewater biodegradability is also different.By measuring the ROC under the waste water variable concentrations, set up ROC-concentration curve (Fig. 2), can understand the influence of contaminated wastewater substrate concentration variation to wastewater biodegradability.For example can suppress microbial activity during the NaCL excessive concentration, and NaCL plays the effect that stimulates microbial activity when low concentration, therefore can understand the influence of different pollutant levels to wastewater biodegradability by the present invention.
2. can understand the reason of wastewater biodegradability difference:
Can understand the reason of wastewater biodegradability difference by waste water ROC-concentration curve.Fig. 2 is the different waste water of three classes relative oxygen utilization ROC under different extension rates
30Change curve.The relative oxygen utilization ROC of I class waste water each point as can be seen from curve
30＞1, ROC
30Value increases along with the increase of substrate concentration, and I class waste water belongs to nontoxic easy biochemical waste water.II class waste water is under the condition of highly diluted multiple, and water sample mesostroma concentration is very low, at this moment ROC
30＞1, embody waste water and have certain biodegradability, along with the reduction of extension rate and the raising of substrate concentration, ROC
30＜1 and descend along with the increase of concentration, explanation is along with the minimizing of extension rate and the raising of concentration, noxious material is more and more obvious to the inhibiting effect of microorganism in the waste water, so but II class waste water belongs to poisonous biochemical waste water, and (low concentration can be biochemical, high concentration is poisonous), this class waste water just can be carried out a biological disposal upon as long as remove noxious material.The relative oxygen utilization ROC of III class waste water
30Be worth all the time＜1 ROC
30Reduce along with the increase of substrate concentration, illustrate that embodying toxicity when concentration is high suppresses, biochemical respiratory capacity embody the refractory organics of waste water, so III class waste water belongs to poisonous bio-refractory waste water less than the endogenous respiration amount during low concentration.
3, assay method is simple, quick:
The instrument and equipment of wanting required for the present invention is simple, all is common device in the laboratory, and is easy to use.Minute is very short simultaneously, can repeatedly measure at any time according to variation of water.By relative oxygen utilization ROC
30Can judge the biodegradability of waste water, pass through ROC
30The mensuration of-C curve can be understood the influence of waste strength to biodegradability, and the assay method simple and fast has been avoided BOD
5The limitation that index wastes time and energy, error is big.
Description of drawings
Fig. 1 is the oxygen consumption rate determinator, wherein 1: dissolved oxygen DO bottle, 2: stirrer, 3: dissolved oxygen probe, 4: dissolved oxygen meter, 5: Water Tank with Temp.-controlled; Fig. 2 is the ROC of different waste water
30-C curve is measured figure; Fig. 3 is different wastewater biochemical respiratory line comparison diagrams; Fig. 4 is industrial waste water ROC
30-C curve is measured figure.
Embodiment
Embodiment one: present embodiment is estimated the biodegradability of industrial waste water as follows:
(1) oxygen consumption rate assay method
Adopt dissolved oxygen meter to measure endogenous respiration and biochemical oxygen utilization of breathing, draw biochemical respiratory line and endogenous respiration line, and come the difference of the different wastewater biodegradabilities of qualitative evaluation with this.Adopt ratio---the relative oxygen utilization of bod and endogenous respiration oxygen utilization simultaneously, come wastewater biodegradability is carried out quantitative evaluation.
1, determining instrument device
1. accurate dissolved oxygen meter;
2. dissolved oxygen DO bottle;
3. Water Tank with Temp.-controlled;
4. oxygen charging pump;
5. pH meter.
Determinator is seen Fig. 1, adopts the accurate dissolved oxygen meter of 850 types, and 300ml dissolved oxygen DO bottle is put into the DO determination instrument probe in the dissolved oxygen DO bottle that is full of water sample.20 ± 0.5 ℃ of Water Tank with Temp.-controlled control water temperature.
2, reagent
1. seed sludge: the aeration tank active sludge that adopts operational excellence is as seed sludge.
2. dilution water: adopt distilled water, before using under 20 ℃ of constant temperatures abundant aeration aerating.
3. hydrochloric acid solution: concentration 0.5mol/L.
4. sodium hydroxide solution: concentration 0.5mol/L.
3, determination step:
1. water sample pre-service
Water sample pH value should be controlled at 6.5～7.5, surpasses this scope if measure water sample pH value, adds hydrochloric acid or NaOH adjusting pH value to 7.0 ± 0.5 under pH meter control.
2. endogenous respiration oxygen consumption rate is measured
Earlier the 5ml seed sludge is added the dissolved oxygen DO bottle, then dilution water after the oxygenation is moved into the dissolved oxygen DO bottle by U trap, fill and set up probe rapidly behind the bottleneck and start stirrer, carry out DO determination.Record water sample dissolved oxygen DO changes when pursuing.
3. waste water water sample biochemical oxygen consumption rate determination
At first with dilution water waste water is mixed with the water sample of variable concentrations as requested, oxygenation is stand-by then.The 5ml seed sludge is added the dissolved oxygen DO bottle, stand-by water sample is moved into the dissolved oxygen DO bottle by U trap, fill and set up probe rapidly behind the bottleneck and start stirrer, carry out DO determination.Record water sample dissolved oxygen DO changes when pursuing.
(2) evaluation index of wastewater biodegradability
1, adopts the proposition of relative oxygen utilization ROC (relative oxygen consumption) evaluation index
The wastewater biochemical respiration oxygen consumption is called relative oxygen utilization ROC with the ratio of endogenous respiration oxygen utilization, ROC has reflected the relation of biochemical respiration oxygen consumption and endogenous respiration oxygen utilization, if water sample ROC to be measured＞1, biochemical respiratory rate is greater than endogenous respiration speed, meaning person microorganism can be decomposed the matrix of utilizing in the waste water, can think that matrix do not poison inhibiting effect to microorganism, the big more wastewater biodegradability of ROC value is good more; Otherwise if water sample ROC to be measured＜1, biochemical respiratory rate illustrates matrix to the toxic inhibiting effect of microorganism less than endogenous respiration speed, and the more little wastewater toxicity of ROC value is strong more, and wastewater biodegradability is poor more.
2, the reaction time determines
Wastewater biochemical oxygen utilization and endogenous respiration oxygen utilization all change in time, and microorganism accumulative total oxygen utilization was directly proportional with the time, and the relative oxygen utilization ROC of differential responses time can be different, for conveniently comparing, need unify to set to the reaction time.The accumulative total oxygen utilization was too small when the reaction time was too short, and the ratio that accounts for initial dissolution oxygen is too small, and test error is bigger; Easy biochemical waste water accumulative total oxygen utilization was excessive when the reaction time was long, caused mixed liquor dissolved oxygen content deficiency easily, measurement deviation occurred.The accumulative total oxygen utilization of different waste water is between 2.0mg/L～4.5mg/L when finding 30min by actual measurement, account for 25%～45% of initial dissolution oxygen, the residue dissolved oxygen content is still sufficient, can be simultaneously easy degrading waste water oxygen utilization mensuration headspaces such as sanitary sewage again, take all factors into consideration the minute of the selected 30min in back as relative oxygen utilization, the relative oxygen utilization ROC of 30min is proposed under 20 ℃ of conditions of water temperature
30Judgement index as toxic used water difficult to degradate biodegradability.
Water sample ROC to be measured
30＞1, show the waste water bio-degradable, ROC
30Big more wastewater biodegradability is good more; Opposite ROC
30≤ 1, show not bio-degradable of waste water, bio-toxicity material or hard-degraded substance content are higher in the waste water, ROC
30More little wastewater biodegradability is poor more.According to result of study, ROC
30Discrimination standard to wastewater biodegradability is:
ROC
30＞1.5 o'clock, the waste water easily biological-degradable;
1.5＞ROC
30＞1.2 o'clock, waste water was biodegradable;
1.2＞ROC
30＞1.0 o'clock, the waste water difficult for biological degradation;
ROC
30＜1.0 o'clock, waste water contained toxicant or amicine matter.
ROC mensuration the reaction time is decided to be 30min in the present embodiment, can adopt the allowed time restriction for some used water difficult to degradate, can adopt 45min, 60min.
Each seed sludge amount of measuring employing needs identical, but quantity is relevant with sludge concentration, and the seed sludge amount can change within the specific limits, adopts 5ml among the present invention, also can adopt 1ml～20ml.
The computing formula of ROC is in the present embodiment:
Also can adopt
Embodiment two: choose paper waste, pharmacy waste water, nitro wastewater from chemical industry and carry out biodegradability and measure, assay method is as follows:
1, measures endogenous respiration oxygen consumption rate and different wastewater biochemical oxygen consumption rate
According to the assay method of introducing in the embodiment one, measure endogenous respiration oxygen consumption rate and different wastewater biochemical oxygen consumption rate, draw the wastewater biochemical respiratory line, see Fig. 3.
2, calculate the relative oxygen utilization ROC of 30min
30
According to the result of Fig. 3, according to
Calculate the ROC of different waste water
30Be respectively: paper waste 1.12, pharmacy waste water 0.88, nitro wastewater from chemical industry 0.78.These several wastewater biodegradabilities of preliminary judgement are relatively poor.
3, investigate the influence of concentration to wastewater biodegradability
Above-mentioned three kinds of waste water are mixed with variable concentrations make ROC
30-C curve is inquired into the relatively poor reason of biodegradability, the results are shown in Figure 4.Paper waste ROC among the figure
30Be between 1.0～1.2, be subjected to concentration affects less; ROC
30Rising with concentration is slowly risen.Pharmacy waste water ROC
30Variation range is bigger, directly is subjected to concentration affects, ROC during low concentration
30Rising with concentration is risen, and reaches behind the finite concentration continuation with person's concentration and raises and descend fast; Be presented as degradable during low concentration, be presented as during high concentration that toxicity suppresses.Nitro wastewater from chemical industry ROC
30Be between 0.78～1.02 ROC
30Rise and descend gradually with concentration.
4. wastewater biodegradability is estimated
According to the decision method that measurement result proposes according to the present invention, paper waste belongs to nontoxic used water difficult to degradate; Pharmacy waste water belongs to toxic material degradable waste water, is presented as that high concentration toxicity suppresses, and low concentration toxicity reduces biodegradable; The nitro wastewater from chemical industry belongs to toxic used water difficult to degradate, is presented as during high concentration that toxicity suppresses waste water difficult for biological degradation during low concentration.
5, evaluation result contrast verification
With measurement result and BOD
5/ COD index contrasts, and the test of carrying out a biological disposal upon is simultaneously verified measurement result.Measurement result sees Table 1, can find in the table for nontoxic difficult degradation paper waste, ROC
30Method and BOD
5The result of determination of/COD ratioing technigue is consistent.
For pharmacy waste water that contains toxicant and nitro wastewater from chemical industry, ROC
30Method and BOD
5The result of determination difference of/COD ratioing technigue is very big, has drawn opposite conclusion, and main cause is that these two kinds of waste water contain toxicant or inhibiting substances, and the height of toxicant concentration directly determines wastewater biodegradability, BOD behind the dilution for many times
5/ COD can only reflect the wastewater biochemical characteristic under the diluted state, can not represent the biochemical characteristic of former water, and from biometric authentication test result, ROC
30The method evaluation is accurate.Therefore for the industrial waste water that contains toxicant or inhibiting substances, ROC
30Method compares BOD
5/ COD method more can reflect the actual biochemical characteristic of waste water.
The different wastewater biodegradability contrasts of table 1
| Project | Paper waste | Pharmacy waste water | The nitro wastewater from chemical industry |
| BOD 5 COD BOD 5/COD BOD 5The biochemical types ROC that/COD determines 30 ROC 30The biochemical types biological treatment average COD removal of determining | 772 2,487 031 difficult degradations, 1.12 nontoxic difficult degradations 65% | 2,231 4,862 0.46 easy degraded 0.88 toxic degradables 58% | The 0.78 toxic difficult degradation 46% of 4,715 11,500 0.41 degradables |
Claims (9)
1, a kind of evaluation method of industrial waste water biodegradability is characterized in that described method is:
One, measures endogenous respiration oxygen consumption rate and wastewater biochemical and breathe oxygen consumption rate: adopt dissolved oxygen meter to measure the biochemical respiration oxygen consumption of endogenous respiration oxygen utilization and industrial waste water, draw wastewater biochemical respiratory line and endogenous respiration line;
Two, adopt relative oxygen utilization to estimate the biodegradability of industrial waste water: the wastewater biochemical respiration oxygen consumption is called relative oxygen utilization ROC with the ratio of endogenous respiration oxygen utilization, if water sample ROC to be measured＞1, biochemical respiratory rate is greater than endogenous respiration speed, illustrate that matrix do not poison inhibiting effect to microorganism, the big more wastewater biodegradability of ROC value is good more; Otherwise if water sample ROC to be measured＜1, biochemical respiratory rate illustrates matrix to the toxic inhibiting effect of microorganism less than endogenous respiration speed, and the more little wastewater toxicity of ROC value is strong more, and wastewater biodegradability is poor more.
2, the evaluation method of a kind of industrial waste water biodegradability according to claim 1, the assay method that it is characterized in that described endogenous respiration oxygen consumption rate is: seed sludge is added the dissolved oxygen DO bottle, then dilution water after the oxygenation is moved into the dissolved oxygen DO bottle by U trap, the DO determination instrument probe is put into the dissolved oxygen DO bottle that is full of water sample carry out DO determination.
3, the evaluation method of a kind of industrial waste water biodegradability according to claim 1, it is characterized in that the described biochemical assay method of breathing oxygen consumption rate is: the water sample that at first with dilution water waste water is mixed with as requested variable concentrations, oxygenation is stand-by then, seed sludge is added the dissolved oxygen DO bottle, stand-by water sample is moved into the dissolved oxygen DO bottle by U trap, the DO determination instrument probe is put into the dissolved oxygen DO bottle that is full of water sample carry out DO determination.
4, the evaluation method of a kind of industrial waste water biodegradability according to claim 3, the pH value that it is characterized in that described water sample is 6.5～7.5.
5,, it is characterized in that adopting the aeration tank active sludge of operational excellence as seed sludge according to the evaluation method of claim 1,2 or 3 described a kind of industrial waste water biodegradabilities.
6, according to the evaluation method of claim 2 or 3 described a kind of industrial waste water biodegradabilities, it is characterized in that described dilution water is a distilled water, before using under 20 ℃ of constant temperatures abundant aeration aerating.
7, the evaluation method of a kind of industrial waste water biodegradability according to claim 1 is characterized in that the minute of selected 30min as relative oxygen utilization, under 20 ℃ of conditions of water temperature, and the relative oxygen utilization ROC of 30min
30Judgement index as toxic used water difficult to degradate biodegradability.
8, the evaluation method of a kind of industrial waste water biodegradability according to claim 7 is characterized in that water sample ROC to be measured
30＞1, show the waste water bio-degradable, ROC
30Big more wastewater biodegradability is good more; ROC
30≤ 1, show not bio-degradable of waste water, bio-toxicity material or hard-degraded substance content are higher in the waste water, ROC
30More little wastewater biodegradability is poor more.
9, the evaluation method of a kind of industrial waste water biodegradability according to claim 7 is characterized in that ROC
30Discrimination standard to wastewater biodegradability is: ROC
30＞1.5 o'clock, the waste water easily biological-degradable; 1.5＞ROC
30＞1.2 o'clock, waste water was biodegradable; 1.2＞ROC
30＞1.0 o'clock, the waste water difficult for biological degradation; ROC
30＜1.0 o'clock, waste water contained toxicant or amicine matter.
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| CN109354160A (en) * | 2018-11-09 | 2019-02-19 | 南京大学盐城环保技术与工程研究院 | A kind of method of wastewater from chemical industry sub-prime adapter tube |
| CN109607826A (en) * | 2019-01-16 | 2019-04-12 | 南京理工大学 | The biological removal method of acute biological toxicity in ozone process |
| CN110790376A (en) * | 2019-11-19 | 2020-02-14 | 清华苏州环境创新研究院 | Method for evaluating biological treatment characteristics of wastewater |
| CN113588765A (en) * | 2021-07-27 | 2021-11-02 | 南京大学 | Method for evaluating biodegradability of soluble organic nitrogen in wastewater and application of method |
| CN113588765B (en) * | 2021-07-27 | 2022-07-08 | 南京大学 | Method for evaluating biodegradability of soluble organic nitrogen in wastewater and application of method |
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