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Advanced treatment method for diatomite for reclaimed-water recycling

A diatom concentrate and advanced treatment technology, applied in the field of water treatment, can solve the problem that the effluent cannot meet the reuse water standard

Inactive Publication Date: 2012-08-01
华方水务(中国)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is primary or secondary treatment, the effluent cannot meet the reuse water standard

Method used

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  • Advanced treatment method for diatomite for reclaimed-water recycling
  • Advanced treatment method for diatomite for reclaimed-water recycling
  • Advanced treatment method for diatomite for reclaimed-water recycling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The fermentative culture of embodiment 1 producing flocculation microorganism

[0036] Under sterile conditions, after the three strains (CGMCC No.3515, CGMCC No.3514 and CGMCC No.3516) were activated on the slant, they were respectively inoculated into LB medium shake flasks, the shaker speed was 200r / min, and the culture time was 50h. In the mid-logarithmic growth stage, inoculate the first-level seed tanks with 5% inoculation amount, and then enlarge and cultivate the second-level seed tanks step by step, and the number of bacteria obtained can reach OD value of 1.0-1.2×10 9 / ml of fermentation liquid. The fermentation medium is glucose 1%, ammonium sulfate 0.15%, dipotassium hydrogen phosphate 0.05%, potassium dihydrogen phosphate 0.05%, magnesium sulfate 0.002%, NaCl 0.02%, calcium chloride 0.01%, the rest is tap water, pH7.0, Fermentation at 28~30℃, tank pressure 0.5kg / cm 2 , the ventilation rate is measured by the volume of fermentation broth in m 3 / air volum...

Embodiment 2

[0037] The preparation of embodiment 2 biological flocculants

[0038] The fermented liquid prepared in Example 1 was centrifuged at 5000rpm for 30min to remove the thallus (precipitation), concentrate (conventional ultrafiltration, decompression) the supernatant, and add CaCl equivalent to 0.1% of the supernatant weight to the supernatant. 2 and 2.5 times the volume of supernatant liquid ethanol, let stand at room temperature for 40 minutes, then centrifuge at 12000g for 15 minutes with a centrifuge, discard the supernatant, and obtain precipitate 1 for subsequent use; dissolve precipitate 1 with 3.0%, pH5 sodium chloride solution (sodium chloride solution just can dissolve precipitate 1 and get final product), absorb with 12% hexadecyltrimethylammonium bromide solution of 1 times sodium chloride solution volume, then obtain precipitate 2 for subsequent use through centrifugation; Dissolve the precipitate 2 with 10% sodium chloride and stir for 12 hours, add absolute ethanol ...

Embodiment 3

[0040] In the diatomaceous earth that diatom shell content is 85wt%, add the diatomaceous earth weight 30wt% that is made of Providencia sp.12A (CGMCC No.3515), Stenotrophomonas sp.46C (CGMCC No.3514) and Myroides sp. 122B (CGMCC No.3516) bio-flocculants prepared by three strains (the weight ratio of the three bio-flocculants is 1:1:2 in sequence), after uniform stirring, it is prepared into diatomite.

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PUM

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Abstract

The invention belongs to the field of water treatment, which discloses an advanced treatment method for diatomite for reclaimed-water recycling. The method comprises the steps that sewage subject to primary treatment and secondary treatment flows through an advanced treatment system comprising a rapid mixing zone and a settling zone, to which diatomite is added, to be subject to advanced treatment; sludge in the settling zone partly flows back to the rapid mixing zone and is partly dewatered and conveyed out during the treatment; the SS concentration in the rapid mixing zone is controlled to be 40mg / L to 80mg / L by controlling the adding amount of the diatomite; a stirring device is provided to stir the sewage and the diatomite; after the sewage and the diatomite are sufficiently mixed, asthe advance rate of water flow becomes slow, the diatomite and micropollutant in the water are further reacted in a slow flow zone, and finally enter the settling zone to be subject to sludge-water separation; and supernatant fluid is discharged. By adopting the method, yielding water can reach the BG / T18920 water quality standard for urban water consumption.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a method for advanced treatment of diatomite for reuse of middle water. Background technique [0002] Sewage advanced treatment refers to the method or process of advanced treatment of domestic sewage or industrial wastewater after primary and secondary treatment, and then through physical and chemical treatment, so that the effluent can be reused as available water resources for production and life. Commonly used to remove trace COD in water cr and BOD 5 Organic pollutants, SS, nitrogen and phosphorus, etc. The current advanced treatment methods include: flocculation sedimentation method, sand filtration method, activated carbon method, ozone oxidation method, membrane separation method, ion exchange method, electrolytic treatment, wet oxidation method, evaporation concentration method and other physical and chemical methods and biological denitrification, denitrification, etc. P...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F1/28
Inventor 蔺嘉梅吴效祥顾文柳郭燕柏勇郭嘉傅婉蓉
Owner 华方水务(中国)有限公司
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