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Polyzirconium coagulant and application thereof

A coagulant and zirconium salt technology, applied in the direction of flocculation/sedimentation water/sewage treatment, osmosis/dialysis water/sewage treatment, membrane technology, etc. Stability and other issues, to achieve the effect of improving anti-pollution performance, small pH change, and easy control

Active Publication Date: 2022-05-06
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 201711390381.9 discloses a preparation method of polymeric silicic acid polymeric zirconium chloride inorganic polymer flocculant. The technical solution uses alkali polymerization to first synthesize polymeric zirconium chloride liquid, and then mix quantitative polysilicic acid with it to obtain Polymerized silicic acid polymerized zirconium chloride liquid flocculant; however, even through the silicic acid copolymerization method, the degree of polymerization of the zirconium salt cannot be further increased. The highest degree of alkalization of the material in this patent is only 2.0, and it is an unstable liquid

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  • Polyzirconium coagulant and application thereof
  • Polyzirconium coagulant and application thereof
  • Polyzirconium coagulant and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Preparation and characterization of embodiment 1 polyzirconium coagulant

[0031] Using zirconium isopropoxide as the zirconium source, the specific preparation process of the polyzirconium coagulant is as follows:

[0032] a) Disperse 5mL of zirconium isopropoxide into 20mL of ethanol I, mix evenly and add 0.061-0.488mL of acetylacetone to obtain liquid A for later use;

[0033]b) Mix 5mL of ethanol II, 0.10-0.79mL of deionized water and 0.6-1.0mL of hydrochloric acid with a mass fraction of 37% to obtain liquid B, and set aside;

[0034] c) adding liquid B to liquid A to obtain a mixed solution;

[0035] d) drying the mixed solution by rotary evaporation at 60-80° C. to constant weight to obtain the polyzirconium coagulant. figure 1 It is the photo of various polyzirconium coagulants S1-S12 obtained in this example.

[0036] The mass percentage of zirconium in the polyzirconium coagulant S1-S12 prepared by different proportions of liquid A and liquid B was detected...

Embodiment 2

[0042] Application of embodiment 2 polyzirconium coagulant in removing turbidity

[0043] In this example, a water sample with simulated turbidity of kaolin was prepared: 100 mg of kaolin was added to 5 L of tap water, stirred thoroughly before use, the turbidity of the water sample was 21.7 NTU, and the pH was about 7.8-8.0.

[0044] After adding the coagulant to the water sample, stir slowly for 15 minutes, and after further precipitation for 20 minutes, take the supernatant to measure the relevant indicators. Select S2 among the embodiment 1 as the polyzirconium coagulant, abbreviated as ZXC, by mixing with simple zirconium salt ZrCl 4 Compared with the polymerized zirconium chloride PZC synthesized by the alkali polymerization method (the preparation method of PZC in this application refers to the method disclosed in the patent CN107151030A, 2017), the performance of the ZXC prepared by the present invention in removing turbidity at different dosages and pHs was explored, ...

Embodiment 3

[0047] Application of embodiment 3 polyzirconium coagulant in removing phosphate

[0048] A simulated phosphorus-containing water sample was prepared in the laboratory: 5 mL of orthophosphate stock solution (5 g P / L) was added to 5 L of tap water, the pH was adjusted to 5.0 with HCl, and the initial phosphorus concentration was 5 mg / L. Comparatively studied S2 in embodiment 1 as polyzirconium coagulant (ZXC) and traditional polyaluminum / polyiron coagulant and novel polytitanium coagulant, comprising polyaluminum chloride (PAC), polyferric sulfate ( PFS) and titanium gel coagulant (TXC) (PAC and PFS are provided by Shenzhen Zhongrun Water Industry Co., Ltd.; TXC is based on the literature: Ganet al. (2022) Basicity of titanium-based coagulants matters in the treatment of low-turbidity water[ J]. Separation and Purification Technology 281, 119989 synthesis). Phosphate concentration was measured by molybdenum-antimony anti-spectrophotometry, and residual metal concentration was ...

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Abstract

The invention belongs to the field of water environment treatment, and particularly relates to a solid polyzirconium coagulant and application thereof.The solid polyzirconium coagulant is obtained by conducting controllable hydrolytic polymerization reaction on simple zirconium salt and has better coagulation performance when water turbidity, organic matter, phosphate and fluoride are removed; the concentration of residual metal in coagulation effluent is low, and the pH change is small; under the same dosage, compared with simple zirconium salt and polymerized zirconium chloride with low polymerization degree, the polyzirconium coagulant prepared by the invention has wider pH and dosage application range, and compared with other metal salt coagulants, the coagulant prepared by the invention has better decontamination performance; in addition, the prepared poly-zirconium coagulant is large in floc size, rapid in sedimentation, low in residual zirconium concentration and high in pollutant removal efficiency, and can be better combined with an ultrafiltration technology to reduce pollution of an ultrafiltration membrane.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a solid polyzirconium coagulant and its application. Background technique [0002] Coagulation is the most important physical and chemical treatment technology in water treatment, which can effectively remove suspended particles and macromolecular organic matter in water. In the whole coagulation process, the coagulant is the core factor that determines the removal efficiency of pollutants. Common coagulants include aluminum and iron salt coagulants, such as polyaluminum chloride (PAC) and polyferric sulfate (PFS), which are widely used in drinking water treatment and sewage / wastewater treatment. However, both aluminum salt and iron salt coagulants have many disadvantages in the application process. Aluminum salt coagulant has a narrow pH range, poor coagulation effect at low temperature, and high residual aluminum concentration brings toxicity problems, etc.; iron salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/54C02F1/56B01D65/08C02F1/44C02F101/10C02F101/30C02F101/14
CPCC02F1/54C02F1/444C02F1/5245C02F2209/06C02F1/5209C02F1/5236C02F2101/105C02F2101/14C02F2101/30
Inventor 张淑娟甘永海陈燕颖杭之昊潘丙才
Owner NANJING UNIV
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