CN104614274A - Method for determining MLSS in high salinity biochemical system - Google Patents
Method for determining MLSS in high salinity biochemical system Download PDFInfo
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- CN104614274A CN104614274A CN201310540249.7A CN201310540249A CN104614274A CN 104614274 A CN104614274 A CN 104614274A CN 201310540249 A CN201310540249 A CN 201310540249A CN 104614274 A CN104614274 A CN 104614274A
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Abstract
The invention relates to a method for determining MLSS in a high salinity biochemical system. The method is based on a gravimetric method principle, and comprises the following steps: weighing filter paper, filtering a mixed solution, drying the filter paper, weighing the filter paper, and washing off sludge intercepted on the filter paper and the surface of the filter paper by using salt-containing clear water after the filtration of the mixed solution by the filter paper. The values of the MLSS and MLVSS can be obtained through the method, and are used to calculate the values of MLVSS/MLSS and SVI. The MLSS value obtained through the improved method provided by the invention is close to a practical MLSS value, the influence of soluble inorganic salts on the MLSS determination is reduced, and convenience is provided for the standardized comparison of the MLSS, MLVSS, MLVSS/MLSS and SVI under different salinity conditions.
Description
Technical field
The invention belongs to wastewater biochemical processing technology field, relate to the assay method of MLSS in high salt biochemical system, to reduce high concentration dissolubility inorganic salts to measure process and result impact on MLSS.
Background technology
What play principal degradation effect to organism in organic wastewater biochemical treatment process is active sludge, and activated sludge concentration in Accurate Determining biochemical system, the adjustment for the design and running parameter of biochemical system is all significant.The standard determination method of activated sludge concentration is gravimetric method, mainly comprises the steps such as filter paper is weighed, mixed liquor filters, filter paper is dried and weigh.But for high salt biochemical system, because dissolubility inorganic salt concentration is very high, the MLSS value adopting standard method to record is higher; And mixed liquor salinity is higher, MLSS measured value is higher more.Consequently, adopt standard weights method to measure activated sludge concentration value evaluation high-salt wastewater biochemical treatment system and there will be deviation, likely the design and running parameter adjustment of high salt biochemical system is misled.
Summary of the invention
Technical matters to be solved by this invention is the error produced for MLSS standard determination method height salt biochemical system MLSS, the assay method of MLSS in a kind of a kind of high salt biochemical system of improvement is provided, can the comparatively index of correlation such as MLSS in Accurate Determining height salt biochemical system.
Technical matters to be solved by this invention is realized by following technical scheme.The present invention is the assay method of MLSS in a kind of high salt biochemical system, the method is based on gravimetric method principle, determination step comprises that filter paper is weighed, mixed liquor filters, filter paper is dried and weighs, and is characterized in: at mixed liquor after Filter paper filtering, rinses with saliferous clear water the mud that filter paper and surface retain.
In high salt biochemical system of the present invention MLSS assay method in, further preferred technical scheme or technical characteristic are:
1. total salinity of mixed liquor is 1% ~ 25%.
2. the saliferous clear water rinsing its surface mud is prepared by distilled water and the pure inorganic salts of analysis.
3. the inorganic salts ingredients preparing saliferous clear water is sodium chloride or sodium sulphate.
4. its total inorganic salts massfraction of saliferous clear water rinsing its surface mud is 0.5% ~ 3.5%.
5. its total inorganic salts massfraction of saliferous clear water rinsing its surface mud is 1.0 ~ 1.5%.
6. the volume ratio for the saliferous clear water and filter mixed liquor that rinse filter paper and surface sludge is 1 ~ 5:1.
Utilize the present invention, high salt biochemical system MLSS and index of correlation can be measured, comprise MLVSS, MLVSS/MLSS, SVI and F/M.
Compared with prior art, the present invention is the improvement on MLSS standard determination method basis, and it is simple to operate, does not increase complexity and the workload of mensuration.According to the inventive method, MLSS and index of correlation in high salt biochemical system are measured, and guide relevant works design and running to manage, be conducive to Rule Summary and experience.
Embodiment
Below in conjunction with test figure and instantiation, content of the present invention is described in detail.
Embodiment 1, an assay method of MLSS in high salt biochemical system, the method is based on gravimetric method principle, and determination step comprises that filter paper is weighed, mixed liquor filters, filter paper is dried and weighs, at mixed liquor after Filter paper filtering, rinse filter paper and the surperficial mud retained with saliferous clear water.
Embodiment 2, in the high salt biochemical system described in embodiment 1 MLSS assay method in: total salinity of described mixed liquor is 1% ~ 25%.
Embodiment 3, in the high salt biochemical system described in embodiment 1 or 2 MLSS assay method in: the saliferous clear water rinsing its surface mud is by distilled water and analyze pure inorganic salts and prepare.
Embodiment 4, in the high salt biochemical system described in embodiment 1 or 2 or 3 MLSS assay method in: the inorganic salts ingredients of preparation saliferous clear water is sodium chloride or sodium sulphate.
Embodiment 5, in the high salt biochemical system of embodiment 1-4 described in any one MLSS assay method in: its total inorganic salts massfraction of saliferous clear water rinsing its surface mud is 0.5% ~ 3.5%.
Embodiment 6, in the high salt biochemical system of embodiment 1-5 described in any one MLSS assay method in: its total inorganic salts massfraction of saliferous clear water rinsing its surface mud is 1.0 ~ 1.5%.
Embodiment 7, in the high salt biochemical system of embodiment 1-6 described in any one MLSS assay method in: the volume ratio for the saliferous clear water and filter mixed liquor that rinse filter paper and surface sludge is 1 ~ 5:1.
Embodiment 8, the assay method experiment of MLSS in a kind of high salt biochemical system:
Standard weights method measures in the operation steps of MLSS, and after mixed liquor filters, filter paper is put into baking oven and at 102 DEG C, dried 2h measure the weight that filter paper increases, then divided by the volume of mixed liquor, namely obtains MLSS value.But for high salt biochemical system, after mixed liquor filters, the mud that filter paper and surface retain can absorb a part of water, and be wherein dissolved with inorganic salts, thus cause MLSS measured value higher, and biochemical system salinity is higher, MLSS measured value is higher more.
Therefore, measure MLSS and index of correlation in high salt biochemical system, before should weighing with oven dry after filtration, remove the dissolubility inorganic salts in water.Rinse its surface with the clear water of certain volume, the accuracy of determination data can be improved.But, if direct distilled water or deionized water clean, likely cause salt-durable microbe cell to rise brokenly, and then cause MLSS measured value on the low side.The way of compromise be the saliferous clear water of preparation low concentration to rinse its surface, both can reduce the impact that salinity measures MLSS and index of correlation, salt-durable microbe cell also can be avoided to rise brokenly phenomenon.The concentration of suitable saliferous clear water is 1% ~ 1.5%.
Having prepared salinity with distilled water and analysis pure sodium chloride is 1% solution.Be MLSS in the high salt biochemical system of 5% in mensuration salinity, with this solution cleaning filter paper and the mud on surface, the MLSS=3025mg/L finally recorded, rinses the MLSS=3540mg/L recorded without saliferous clear water.
Embodiment 9, the assay method experiment of MLSS in a kind of high salt biochemical system:
It is MLVSS/MLSS that another one can reflect that standard weights method measures the method that in high salt biochemical system, activated sludge concentration measured value is higher.Cultivate or active sludge that mud age is shorter for new, no matter be less salt biochemical system or high salt biochemical system, MLVSS/MLSS is relatively high.In general, if MLVSS/MLSS value is on the low side, reason is that in mud, inorganic component is higher, is probably that deliquescent inorganic salts have counted MLSS value.For the active sludge that inorganic component content in aging and suspension is higher, MLVSS/MLSS value is general lower, may lower than 0.5.
Adopt the inventive method and general gravimetric method, still measure the active sludge MLVSS in above-mentioned 5% high salt biochemical system, the result recorded is respectively 2730mg/L and 2786mg/L, and MLVSS/MLSS is respectively 0.92 and 0.78.
Adopt the inventive method and general gravimetric method, measure the active sludge MLVSS/MLSS in certain high salt biochemical system of about 8%, the result recorded is respectively 0.88 and 0.75.
Adopt the inventive method and general gravimetric method, measure the active sludge MLVSS/MLSS in certain high salt biochemical system of about 20%, the result recorded is respectively 0.84 and 0.63.
Adopt the inventive method and general gravimetric method, measure the active sludge MLVSS/MLSS in certain high salt biochemical system of about 15%, the result recorded is respectively 0.78 and 0.61.
Due to MLVSS mensuration is volatile constituent, and therefore its result is by the impact of salinity.But engineering design and daily operation management often use MLSS to substitute MLVSS to reflect the biomass of system.Therefore, measure MLSS and index of correlation in high salt biochemical system by standard weights method, and the Design cooling load of reference general biochemical method, actual motion load finally may be caused higher; From the load that stable operation needs, the conclusion drawn is likely that salinity is higher, and sludge loading is lower.Therefore, select suitable sludge loading parameter for convenience of under different salt concentration conditions, and can compare mutually, the salinity of saliferous clear water in mensuration process is fixed up necessary.
Embodiment 10, the assay method experiment of MLSS in a kind of high salt biochemical system:
High-salt wastewater is originated according to it, and wherein inorganic salts are generally sodium chloride or sodium sulphate, also has part chloride containing calcium, ammonium chloride, ammonium sulfate etc.For convenience of the comparison of activated sludge concentration in different salinity, high salt biochemical system under different salt concentration conditions, selective chlorination sodium of the present invention and sodium sulphate are as the inorganic salinity of saliferous clear water.In principle, when the Main Salts in biochemical system is not sodium chloride and sodium sulphate, the saliferous clean water filter paper that these inorganic salts also can be adopted to prepare and surface sludge.
Sodium chloride and sodium sulphate is adopted to be as the another one reason of the standard salinity of saliferous clear water: to be found by test, salt tolerant active sludge can adapt to by very fast carrying out for the waste water of sodium chloride-containing and sodium sulphate, salt tolerant or halophilic microorganism cell will be caused to occur large damage due to the difference of salinity.
Claims (7)
1. the assay method of MLSS in one kind high salt biochemical system, the method is based on gravimetric method principle, determination step comprises that filter paper is weighed, mixed liquor filters, filter paper is dried and weighs, and it is characterized in that: at mixed liquor after Filter paper filtering, rinses with saliferous clear water the mud that filter paper and surface retain.
2. the assay method of MLSS in high salt biochemical system according to claim 1, is characterized in that: total salinity of mixed liquor is 1% ~ 25%.
3. the assay method of MLSS in high salt biochemical system according to claim 1, is characterized in that: the saliferous clear water rinsing its surface mud is by distilled water and analyze pure inorganic salts and prepare.
4. the assay method of MLSS in high salt biochemical system according to claim 3, is characterized in that: the inorganic salts ingredients of preparation saliferous clear water is sodium chloride or sodium sulphate.
5. the assay method of MLSS in the high salt biochemical system according to claim 1 or 3 or 4, is characterized in that: its total inorganic salts massfraction of saliferous clear water rinsing its surface mud is 0.5% ~ 3.5%.
6. the assay method of MLSS in high salt biochemical system according to claim 1, is characterized in that: its total inorganic salts massfraction of saliferous clear water rinsing its surface mud is 1.0 ~ 1.5%.
7. the assay method of MLSS in high salt biochemical system according to claim 1, is characterized in that: the volume ratio for the saliferous clear water and filter mixed liquor that rinse filter paper and surface sludge is 1 ~ 5:1.
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Citations (4)
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|---|---|---|---|---|
| JPS52114396A (en) * | 1976-03-22 | 1977-09-26 | Nippon Herusu Kougiyou Kk | Method of measuring amount of sludge in aeration liquid |
| JP2000121417A (en) * | 1998-10-19 | 2000-04-28 | Kubota Corp | Method for measuring weight of sample |
| CN101699261A (en) * | 2009-10-21 | 2010-04-28 | 河海大学 | Method for monitoring suspended solid SS in sludge water of water treatment plant |
| CN101717813A (en) * | 2009-12-28 | 2010-06-02 | 广东环凯微生物科技有限公司 | Method for detecting total number of bacterial colonies in activated lactobacillus drink |
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- 2013-11-05 CN CN201310540249.7A patent/CN104614274A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52114396A (en) * | 1976-03-22 | 1977-09-26 | Nippon Herusu Kougiyou Kk | Method of measuring amount of sludge in aeration liquid |
| JP2000121417A (en) * | 1998-10-19 | 2000-04-28 | Kubota Corp | Method for measuring weight of sample |
| CN101699261A (en) * | 2009-10-21 | 2010-04-28 | 河海大学 | Method for monitoring suspended solid SS in sludge water of water treatment plant |
| CN101717813A (en) * | 2009-12-28 | 2010-06-02 | 广东环凯微生物科技有限公司 | Method for detecting total number of bacterial colonies in activated lactobacillus drink |
Non-Patent Citations (3)
| Title |
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| 中华人民共和国建设部: "《CJ/T 221-2005城市污水处理厂污泥检验方法》", 30 December 2005 * |
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