CN100365408C - On-line detection evaluating method for cryptosporozoam in drinking water treatment process - Google Patents
On-line detection evaluating method for cryptosporozoam in drinking water treatment process Download PDFInfo
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- CN100365408C CN100365408C CNB2005100099662A CN200510009966A CN100365408C CN 100365408 C CN100365408 C CN 100365408C CN B2005100099662 A CNB2005100099662 A CN B2005100099662A CN 200510009966 A CN200510009966 A CN 200510009966A CN 100365408 C CN100365408 C CN 100365408C
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Abstract
The present invention relates to an on-line inspection and assessment method of cryptosporidium in the process of drinking water treatment, particularly to a method for detecting cryptosporidium in the process of drinking water treatment. The present invention aims to solve the defect of no assessment and prediction of the penetrating risk of cryptosporidium with the traditional method. The method is realized by that the effluent of a filtering pond is collected as water samples, and a laser grain counting device is used for on-line inspection of the quantity of the number of particles with similar particle diameters with cryptosporidium or larger particle diameters in the process of drinking water treatment. When the number of particles in the detected particle size range of colloid is larger than the set value of the number of particles of the detected colloid, the water before filtration and/or the filtering process is regulated until the number of particles of the colloid in the effluent of the filtering pond is less than or equal to the set value of the number of particles of the detected colloid in the qualified effluent. Compared with the on-line turbidity meter, the method has the advantages of sensitivity and precision and can monitor the penetrating risk of cryptosporidium so as to provide reliable foundation for increasing water quality, regulating technology and optimizing control with automatic control.
Description
Technical field:
The present invention relates to a kind of method that in the drinking water treatment process, detects and handle Cryptosporidium.
Background technology:
Cryptosporidium is a kind of protozoan pathogen, and it can cause gastrointestinal disease.Under relatively poor water treatment condition, Cryptosporidium is easy to penetrate, thereby the possibility that causes causing the gastrointestinal disease large-scale outbreak increases, and breaks out repeatedly in American-European developed country.Studies show that Cryptosporidium can be regarded the biocolloid particle as.Cryptosporidium subglobular, diameter are about 4.5～5.5 microns, and density is 1.025～1.070g/cm
3, only slightly bigger than the density of water.Recorded by zeta potential, Cryptosporidium egg capsule surface charge is neutral or slight inclined to one side negative value in most of nature water bodys, and the exact value of its surface charge is by concrete analytical approach decision.Experiment finds that Cryptosporidium its electrophoresis flowability after preserving 121 days still remains unchanged, and this special particle pathogen has repellence to chlorination, so just it should be got rid of at filtration stage at least.
Studies show that, adopt the method for chemical inactivation can change the zeta current potential of Cryptosporidium egg capsule.The zeta current potential plays decisive action to coagulation process and filtering technique subsequently, and it can indicate the degree of particle unstability.The change of colloidal solid initial surface electric charge (as the influence of Cryptosporidium) can influence the clearance of granule medium filtration to colloidal solid, and, in water treatment procedure, the zeta current potential of Cryptosporidium can be influenced by several factors, as the kind of raw water quality, coagulant and the chemical inactivation before consumption, pH value and the processing.The difference of Cryptosporidium egg capsule zeta current potential can not impact the principle of whole coagulation process before the coagulation, because compare with other particles of existing in the water in essence, the surface of Cryptosporidium egg capsule is not very important, even there are some researches show that the artificial Cryptosporidium egg capsule that adds high concentration in water also is like this.
Studies show that; Cryptosporidium can be used as colloid and treat in water treatment procedure; so when experiment condition is limited can't be when the instrument detecting Cryptosporidium; certain part particle penetration after can filtering by simple mensuration is estimated the risk that penetrates of Cryptosporidium, and determined particle can wrap up the particle of Cryptosporidium slightly greatly for size particle or the particle diameter close with Cryptosporidium.
Classic method is to detect particle penetration with turbidimeter, but the reading of turbidimeter can make the people misread, because these readings do not provide the endocorpuscular perfect number of each particle size range, this just means that also penetrating of Cryptosporidium can't be estimated and predict.
Summary of the invention:
The present invention is in order to solve classic method and be unable to estimate and predict the shortcoming that penetrates risk of Cryptosporidium, in real time, accurately, the simple harm that detects and estimate the Cryptosporidium of water outlet in the drinking water treatment process, the online detection risk evaluation method of Cryptosporidium in a kind of drinking water treatment process is provided, this method detects the granule number that filters back water in the drinking water treatment process by laser particle counter, estimate the risk that penetrates of Cryptosporidium, detection is real-time and effect is very satisfactory, thereby provide foundation for improving water technology, it is achieved in that the water outlet of acquisition filter pond is as water sample, the employing laser particle counter is that the quantity of the colloidal solid of 2～7 μ m is carried out online detection to particle diameter, when the detected colloidal solid number that contains in the filtering ponds water outlet smaller or equal to qualified water outlet in during the detected particle size range granule number of colloid setting value, the filtering ponds water outlet enters the sterilization pool disinfection, obtains the lower qualified water outlet of risk; When the detected colloidal solid number that contains in the filtering ponds water outlet greater than qualified water outlet in during the detected particle size range granule number of colloid setting value, water before filtering and/or filter process are adjusted, and the detected colloidal solid number that contains in the filtering ponds water outlet is counted setting value smaller or equal to colloidal solid in the qualified water outlet.It is realized like this: the water outlet of acquisition filter pond is as water sample, the employing laser particle counter is that the quantity of the colloidal solid of 2～7 μ m is carried out online detection to particle diameter, when the detected colloidal solid number that contains in the filtering ponds water outlet smaller or equal to qualified water outlet in during the detected particle size range granule number of colloid setting value, the filtering ponds water outlet enters the sterilization pool disinfection, obtains the lower qualified water outlet of risk; When the detected colloidal solid number that contains in the filtering ponds water outlet greater than qualified water outlet in during the detected particle size range granule number of colloid setting value, water before filtering and/or filter process are adjusted, and the detected colloidal solid number that contains in the filtering ponds water outlet is counted setting value smaller or equal to colloidal solid in the qualified water outlet.
The used laser particle counter of the present invention can online automatic detection, show numbers of particles and figure, and the error of avoiding artificial reading to cause has improved precision and accuracy, can be used as effective ingredient of whole water treatment controlling system.The particle size range of laser detection is 2～7 microns among the present invention; main sensing range can be wrapped up the particle of Cryptosporidium slightly greatly for size particle or the particle diameter close with Cryptosporidium in the reality; the more online turbidimeter sensitivity of its invention effect; accurately; be that 0.1NTU is when following at turbidity generally speaking; though water quality is qualified; but online turbidimeter can not be judged the risk of Cryptosporidium; this method not only can detect by the all-wave spectral limit; differentiate; and can monitor temperature; add pharmaceutical quantities; organic contaminants etc. are to the harm of the colloidal material penetrability of Cryptosporidium grain diameter, thereby provide reliable foundation for the optimal control of adjusting process and control automatically.
Description of drawings:
Fig. 1 is the control system process flow diagram of laser detection particle penetration, the water sample that Fig. 2 does not contain humic acid for filtering velocity 5m/h penetrates the figure as a result (not adding medicament) of influence in the filter tank to 2～7 μ m particles in different temperatures, the water sample that Fig. 3 does not contain humic acid for filtering velocity 5m/h penetrates the figure as a result (adding medicament 0.6mg/L) of influence in the filter tank to 2～7 μ m particles in different temperatures, the water sample that Fig. 4 does not contain humic acid for filtering velocity 5m/h penetrates the figure as a result (15 ℃) of influence in the filter tank to 2～7 μ m particles at different added amount of chemical, the water sample that Fig. 5 does not contain humic acid for filtering velocity 5m/h penetrates the figure as a result (25 ℃) of influence in the filter tank to 2～7 μ m particles at different added amount of chemical, Fig. 6 contains humic acid 5mg/L for filtering velocity 5m/h water sample penetrates the figure as a result of influence at humic acid to 2～7 μ m particles in the filter tank, Fig. 7 is the partial enlarged drawing of Fig. 6.
Embodiment:
Embodiment one: referring to Fig. 1, present embodiment is achieved in that former water enters filtering ponds after routine is handled, the water outlet of acquisition filter pond is as water sample, adopting laser particle counter is that the detected particle size range quantity of colloid of 2～1000 μ m is carried out online detection to particle diameter, when the detected colloidal solid number that contains in the filtering ponds water outlet smaller or equal to qualified water outlet in colloidal solid when counting setting value, the filtering ponds water outlet enters the sterilization pool disinfection, obtains the lower qualified water outlet of risk; When the detected colloidal solid number that contains in the filtering ponds water outlet greater than qualified water outlet in during the detected particle size range granule number of colloid setting value, water before filtering and/or filter process are adjusted, this method of adjustment can be manually-operated, also can operate by computer program, the colloidal solid number that contains in the filtering ponds water outlet is counted setting value smaller or equal to colloidal solid in the qualified water outlet.Wherein, the mode that water before filtering is handled is the combination of a kind of, two kinds or three in the dosage that increases medicament, enhanced coagulation, the reinforced deposition; The mode that filter process is handled for the dosage that increases medicament, change medicament kind, change filtering material, reduce one or more the combination in the filter velocity.Because former water is subjected to the influence of region, temperature, environment very big, so the colloidal solid setting value is unified standard not, need detect and set according to medical science, microorganism, toxicology, the detected colloidal solid number in the present embodiment be that the colloidal solid of particle diameter in 2～7 or 2～15 or 2～800 μ m or 2～1000 mu m ranges counted sum.
Embodiment two: the influence that present embodiment penetrates in the filter process Cryptosporidium grain graininess material with monitor temperature is an example, and shown in Fig. 2,3, concrete detection method is identical with embodiment one.As can be seen from Figure 2, temperature is high more, and it is few more to filter out water-borne glue body numbers of particles, and this explanation penetrance danger of Cryptosporidium particle in the filter process is low more.In order to further specify medicament penetrance is also had certain influence, enumerated in the table 1 and added medicament under the different temperatures and do not add medicament filtering out the correlation data of water-borne glue body numbers of particles.
Table 1
Embodiment three: present embodiment is an example with the influence that the monitoring added amount of chemical penetrates in the filter process Cryptosporidium grain graininess material, shown in Fig. 4,5.As can be seen from the figure, along with increasing of added amount of chemical, it is fewer and feweri to filter out water-borne glue body numbers of particles, and this explanation penetrance danger of Cryptosporidium particle in the filter process is low more.Enumerated under the different temperatures additive amount of medicament in the table 2 to filtering out the correlation data of water-borne glue body numbers of particles.
Table 2
Embodiment four: present embodiment is an example with the influence that monitoring organic contaminant humic acid penetrates in the filter process Cryptosporidium grain graininess material, shown in Fig. 6,7.As can be seen from the figure, the existence of organic contaminant humic acid can increase and filters out water-borne glue body number of particles.Enumerated under the different condition organic contaminant humic acid in the table 3 to filtering out the correlation data of water-borne glue body numbers of particles.
Table 3
Embodiment five: present embodiment is achieved in that (one) former water enters into mixing pit, adds chemical agent in mixing pit; (2) former water with react through reaction tank after chemical agent mixes, then the precipitation that produces in the reaction tank is carried out mud-water separation by settling basin; (3) the settling basin water outlet enters filtering ponds and carries out filtration treatment; (4) water outlet of acquisition filter pond is as water sample, adopt laser particle counter that the quantity of Cryptosporidium in the drinking water treatment process is carried out online detection, detected object is mainly size particle or the particle diameter close with Cryptosporidium can wrap up the particle of Cryptosporidium slightly greatly, through detecting, laser particle counter shows that the colloidal solid number that contains in the water sample that detects is 15000, be higher than setting value 800, do not meet the water outlet requirement, can select following disposal route: a, enhanced coagulation, in mixing pit, increase the dosage of chemical agent; B, dosage, change filtering material, reduction filter velocity at filtering ponds front end increase medicament.When adopting a method separately, the colloidal solid number that contains in the water sample is 500, is lower than setting value, meets the water outlet requirement; When adopting the b method separately, the colloidal solid number that contains in the water sample is 300, is lower than setting value, meets the water outlet requirement; When adopting a, b method simultaneously, the colloidal solid number that contains in the water sample is 100, is lower than setting value, meets the water outlet requirement.
Claims (3)
1. online detection and the feedback method for treating of Cryptosporidium in the drinking water treatment process, it is characterized in that it is achieved in that the water outlet of acquisition filter pond is as water sample, the employing laser particle counter is that the quantity of the colloidal solid of 2～7 μ m is carried out online detection to particle diameter, when the detected particle size range granule number that contains in the filtering ponds water outlet smaller or equal to qualified water outlet in during the colloidal solid setting value, the filtering ponds water outlet enters the sterilization pool disinfection, obtains the lower qualified water outlet of risk; When the detected particle size range granule number that contains in the filtering ponds water outlet greater than qualified water outlet in colloidal solid when counting setting value, water before filtering and/or filter process are adjusted, and the detected colloidal solid number that contains in the filtering ponds water outlet is smaller or equal to the detected particle size range granule number of colloid setting value in the qualified water outlet.
2. online detection and the feedback method for treating of Cryptosporidium in the drinking water treatment process according to claim 1 is characterized in that the combination for a kind of, two kinds or three kinds in the dosage that increases medicament, enhanced coagulation, the reinforced deposition of mode that water before filtering is handled.
3. online detection and the feedback method for treating of Cryptosporidium in the drinking water treatment process according to claim 1, it is characterized in that mode that filter process is handled for the dosage, the kind that changes medicament that increase medicament, change filtering material, reduce one or more the combination in the filter velocity.
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| CNB2005100099662A CN100365408C (en) | 2005-05-08 | 2005-05-08 | On-line detection evaluating method for cryptosporozoam in drinking water treatment process |
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| CNB2005100099662A CN100365408C (en) | 2005-05-08 | 2005-05-08 | On-line detection evaluating method for cryptosporozoam in drinking water treatment process |
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| CN1673717A CN1673717A (en) | 2005-09-28 |
| CN100365408C true CN100365408C (en) | 2008-01-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1070952A2 (en) * | 1999-07-23 | 2001-01-24 | Eauxsys (UK) Limited | Method and means for particle measurement |
| JP2001264232A (en) * | 2000-03-21 | 2001-09-26 | Japan Science & Technology Corp | Particle measuring method and its device |
| JP2002243620A (en) * | 2001-02-21 | 2002-08-28 | Suido Kiko Kaisha Ltd | Method of counting particulate floating in water equivalent to refractive index of water |
| US6650414B1 (en) * | 1999-06-28 | 2003-11-18 | Shimadzu Corporation | Method of monitoring microbe in water |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6650414B1 (en) * | 1999-06-28 | 2003-11-18 | Shimadzu Corporation | Method of monitoring microbe in water |
| EP1070952A2 (en) * | 1999-07-23 | 2001-01-24 | Eauxsys (UK) Limited | Method and means for particle measurement |
| JP2001264232A (en) * | 2000-03-21 | 2001-09-26 | Japan Science & Technology Corp | Particle measuring method and its device |
| JP2002243620A (en) * | 2001-02-21 | 2002-08-28 | Suido Kiko Kaisha Ltd | Method of counting particulate floating in water equivalent to refractive index of water |
Non-Patent Citations (2)
| Title |
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| 优化监测与净水工艺提高致病原生动物去除率. 杨艳玲等.给水排水，第29卷第6期. 2003 * |
| 基于DSP技术的在线颗粒计数器. 杜崴等.中国测试技术，第31卷第2期. 2005 * |
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