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Phosphorus removal adsorbent for modifying oyster shell with iron salt and preparation method as well as application thereof

A technology of oyster shells and adsorbent, which is applied in the field of sewage treatment, can solve the problems of large amount of adsorbent, etc., and achieve the effects of simple preparation method, obvious energy saving effect and low cost

Inactive Publication Date: 2012-06-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation process of the adsorbent is simple, the energy consumption is low, the price of raw materials is low, and the modified phosphorus adsorption capacity is significantly improved, the implementation cases provided in the patent all show that the maximum removal rate of phosphorus is only 60%, which is relatively low. , the amount of adsorbent used in the application is too large, which has certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation method of phosphorus-removing adsorbent for iron salt modified oyster shells

[0034] a. The discarded oyster shells at the seaside were washed with deionized water, dried at 100°C, and ground through a 50-mesh sieve to obtain oyster shell powder, which was stored in a sealed bottle.

[0035] b. Use FeCl 3 .6H 2 O to prepare 0.5mol / L FeCl 3 1000mL of the solution is used for later use.

[0036] c. Weigh 50 g of oyster shell powder obtained in step a, and add to 100 mL, 0.5 mol / L of FeCl obtained in step b 3 The solution was uniformly stirred at a rate of 500 r / min for 6 h at room temperature, and then 10% NaOH was added to adjust the pH of the solution to 7 to obtain a dark brown suspension.

[0037] d. Filter the suspension obtained in step c to obtain a brown precipitate, place the precipitate in an oven at 105°C and dry to constant weight to obtain a phosphorus removal adsorbent containing 86 wt% of oyster shells and 14 wt% of iron salt.

[0038]...

Embodiment 2

[0043] (1) Preparation method of phosphorus-removing adsorbent of iron salt modified oyster shell

[0044] a. Weigh 10g of 50 mesh oyster shell powder and add to 6.5mL, 0.5mol / L FeCl 3 To the solution, 95 mL of deionized water was added and stirred while adding to obtain a reddish-brown suspension.

[0045] b. Put the suspension obtained in step a on a magnetic stirrer, stir evenly at a rate of 800 r / min for 3 hours at room temperature, then add 10% NaOH to adjust the pH of the solution to 7, and obtain a dark brown suspension.

[0046] c. Filtrate the suspension obtained in step b to obtain a brown precipitate, and place the precipitate in an oven at 105° C. to dry to constant weight to obtain a phosphorus removal adsorbent containing 95 wt % of oyster shells and 5 wt % of iron salt.

[0047] (2) Effect evaluation of iron salt modified oyster shell adsorbent for phosphorus removal

[0048] The effect evaluation method of the phosphorus removal adsorbent of iron salt modifie...

Embodiment 3

[0051] (1) Preparation method of phosphorus-removing adsorbent of iron salt modified oyster shell

[0052] The preparation method of the phosphorus-removing adsorbent of iron salt modified oyster shells is the same as in Example 2, except that in step b, uniform stirring at a rate of 1200r / min for 3h is used instead of uniform stirring at a rate of 800r / min for 3h; step c In 66.3mL, 0.5mol / L FeCl 3 solution instead of 6.5mL, 0.5mol / L FeCl 3 solution.

[0053] The final product is a phosphorus removal adsorbent containing 65wt% of oyster shells and 35wt% of iron salts.

[0054] (2) Effect evaluation of iron salt modified oyster shell adsorbent for phosphorus removal

[0055] The effect evaluation method of the phosphorus removal adsorbent of iron salt modified oyster shell is the same as embodiment 1 (1).

[0056] Test results: the equilibrium adsorption capacity of the phosphorus removal adsorbent to the phosphorus in the solution is 9.99mg(P) / g, and the phosphorus removal...

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Abstract

The invention discloses a composition of a phosphorus removal adsorbent for modifying oyster shell with iron salt and a preparation method as well as application thereof in the aspect of sewage treatment. The adsorbent is prepared by the following steps of: mixing 30-mesh to 100-mesh oyster shell powder and iron salt solution according to a certain mass ratio; and stirring at the room temperature, adjusting pH value, filtering, collecting precipitate and drying, wherein the adsorbent main body in a product is the oyster shell; the iron salt is used as a modifier; the removal effect of phosphorus by the product is measured through molybdenum stibium anti-spectrophotometer; and results prove that the adsorbent has higher phosphorus removal rate under the condition of pH of 5-9, the adsorption is balanced, and the required time is short. Simulated wastewater test shows that the removal rate of the phosphorus in a water body is over 95 percent after the solution with phosphorus content of 100 mg / l is adsorbed for 2 hours. The product has the advantages of simple production process, readily available raw materials, obvious energy-saving effect, low production cost, easiness in promotion and application and more contribution to realizing double purposes of environmental protection and waste control by waste.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a phosphorus-removing adsorbent for modifying oyster shells with iron salts, a preparation method thereof and an application in the field of sewage treatment. Background technique [0002] Oyster shells are derived from wastes from the production and consumption of seaside oysters, and are mainly composed of minerals, proteins, polysaccharides and other organic matter, of which the calcium content is more than 95%. Oyster shells are rich in cross-linked micropores, which have certain adsorption and exchange capabilities. According to statistics, the annual output of oyster shells in my country's coastal areas is about 1 million tons, most of which are directly discarded as waste, causing environmental pollution and waste of resources. [0003] The eutrophication of water bodies in lakes and river basins in my country continues to intensify. Phosphorus is one of the ma...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/58
Inventor 项学敏王玉侠周集体王刃周光红王晓坤
Owner DALIAN UNIV OF TECH
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