Raw material prescription and preparing method for preparing recoverable wastewater dephosphorization material using shuck

A technology for oyster shells and wastewater, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as difficult promotion, high cost, and difficult cleaning, so as to improve market competitiveness and realize environmental protection , good application prospects

Inactive Publication Date: 2008-05-14
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a large amount of coagulant, which is costly, and the sludge formed will cause secondary pollution of the water body
2) Biological method: Plant aquatic plants with purification and adsorption properties for nitrogen and phosphorus, store nitrogen and phosphorus in plant tissues and then fish them out. This method is limited by time, season and environmental conditions; biofilm method is easy to pollute because of the membrane surface Clogged, difficult to clean, difficult to promote
The phosphorus removal efficiency of the adsorption method is not high. After a large amount of adsorbent powder is put in, the sludge will increase, the recovery will be difficult, and the secondary pollution will be more serious.
[0005] Oyster shells are rich in calcium resources. The activity of calcium in calcined oyster shells is very high, the phosphorus removal response time is fast, the efficiency is high, and the adsorption and phosphorus removal capacity is stronger than that of ordinary quicklime. 5 OH(PO 3 ) 3 Insoluble sediment, the formed sludge will lead to secondary pollution of the water body, and phosphorus removal materials cannot be recycled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The recyclable waste water phosphorus removal material is prepared by using oyster shells and clay as raw materials, and the raw material formula is as follows: oyster shells 65%, clay 35%.

[0026] Preparation steps:

[0027] a. Put the oyster shells in a kiln for pre-burning at 500°C for 1 hour, then crush them and pass through a 200-mesh sieve;

[0028] b. Weigh the raw materials according to the above formula, add an appropriate amount of water and mix evenly to a muddy material;

[0029] c. Extrude the mud-like material to obtain a granular sample with an outer diameter of 20mm;

[0030] d. Dry the molded sample at 50°C for 4 hours;

[0031] e. After drying, the sample is placed in a kiln and fired at 650°C for 2 hours, then naturally cooled to room temperature to prepare the waste water phosphorus removal material.

[0032] Net material performance for wastewater phosphorus removal: inject 10L simulated wastewater with an initial phosphorus concentration of 5mg...

Embodiment 2

[0034] The recyclable wastewater phosphorus removal material is prepared by using oyster shells and clay as raw materials, and the raw material formula is as follows: oyster shells 70%, clay 30%.

[0035] Preparation steps:

[0036] a. Put the oyster shells in a kiln for pre-burning at 500°C for 1 hour, then crush them and pass through a 200-mesh sieve;

[0037] b. Weigh the raw materials according to the above formula, add an appropriate amount of water and mix evenly to a muddy material;

[0038] c. Extrude or press the mud-like material to obtain a tubular sample with an outer diameter of 6 mm, an inner diameter of 3 mm, a length of 6 mm, and an outer diameter of 12 mm, an inner diameter of 9 mm, and a length of 12 mm;

[0039] d. Dry the molded sample at 80°C for 3 hours;

[0040] e. After drying, the sample is placed in a kiln at 700°C and fired for 1 hour, then naturally cooled to room temperature to prepare the waste water phosphorus removal material.

[0041] Net ma...

Embodiment 3

[0044] The recyclable wastewater phosphorus removal material is prepared by using oyster shells and clay as raw materials, and the raw material formula is as follows: oyster shells 75%, clay 25%.

[0045] Preparation steps:

[0046] a. Put the oyster shells in a kiln for pre-burning at 500°C for 1 hour, then crush them and pass through a 200-mesh sieve;

[0047] b. Weigh the raw materials according to the above formula, add an appropriate amount of water and mix evenly to a muddy material;

[0048] c. Carry out the mud-like material with the method of compression molding, make the tubular sample of outer diameter 8mm, inner diameter 4mm, length 8mm and the granular sample of outer diameter 10mm;

[0049] d. Dry the molded sample at 100°C for 2 hours;

[0050]e. After drying, the sample is placed in a kiln at 800°C for 0.5 hours and then naturally cooled to room temperature to obtain a waste water phosphorus removal material.

[0051] Net material performance for wastewater ...

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Abstract

The invention provides a raw material formula and a preparation method of using oyster shells to prepare recyclable waste water phosphorus removal materials. The method makes full use of the rich calcium resources contained in oyster shells, mixes calcined oyster shells and clay uniformly in an appropriate proportion, and forms them. It is sintered into a tubular or granular wastewater phosphorus removal material with a fixed shape. The product formula and process of the invention are simple, low in cost, strong in phosphorus removal capacity, high in product strength, recyclable, solve technical problems restricting the recycling and regeneration of phosphorus removal materials, and have strong market competitiveness and popularization and application value.

Description

technical field [0001] The invention relates to eco-environmental materials, pollution control with waste, that is, comprehensive utilization of solid waste and waste water treatment technology, especially a raw material formula and preparation method for preparing recyclable waste water phosphorus removal materials by using waste oyster shells. Background technique [0002] Various human activities have resulted in a large amount of wastewater rich in nitrogen and phosphorus being discharged into rivers, lakes and seas, resulting in eutrophication of water bodies. Large-scale red tides have occurred in many places in my country's sea areas from the Bohai Sea to the South China Sea. At the same time, the aquaculture industry in coastal areas is developed, and the area, output and quantity of oyster farming are astonishing. In Xiamei Town, Zhangpu County, Fujian Province alone, the oyster breeding area reaches 30,000 mu, and 10,000 tons of oyster shells are discarded every ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/28
Inventor 于岩吴任平王素伟余平张延涵阮玉忠
Owner FUZHOU UNIV
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