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Modified expanded perlite for treating low-concentration ammonia-nitrogen wastewater and wastewater treatment method

A technology of expanded perlite and low-concentration ammonia-nitrogen, which is applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of difficult treatment and cost of ammonia-nitrogen wastewater, and achieve improved adsorption efficiency and selectivity, strong The effect of ion exchange capacity and easy operation

Active Publication Date: 2012-08-01
WUHAN XINGTIANYU ENVIRONMENTAL ENG
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the present invention creatively uses copper ions to chemically modify the porous expanded perlite, enhances its complexation and selective adsorption capacity for ammonia, and solves the difficulty and high cost of low-concentration ammonia-nitrogen wastewater The problem

Method used

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  • Modified expanded perlite for treating low-concentration ammonia-nitrogen wastewater and wastewater treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1 expanded perlite chemical modification

[0018] Put into 5% (w / w) sulfuric acid solution activation 0.5 hour through the expanded perlite 500 grams of drying and crossing 60 mesh sieves, put into saturated copper salt (copper sulfate, cupric chloride, Copper nitrate, etc.) solution, the soaking time is controlled at about 0.5-1.0 hours, and the dosage of expanded perlite is limited to be completely submerged in the copper salt saturated solution. Finally, it is filtered out and dried at 105±5°C to obtain the modified expanded perlite product.

Embodiment 2

[0019] Embodiment 2 wastewater treatment process

[0020] Using the fixed bed reaction method, 500 grams of the modified expanded perlite prepared in Example 1 and 500 grams of the unmodified expanded perlite were put into the adsorption reaction columns A-1 and A with upper and lower water inlets and outlets respectively. In -2, fill in. Adjust the pH value of the wastewater with an ammonia nitrogen content of 378mg / L to 7-9. Then take 3000ml of the waste water and introduce them into two adsorption columns respectively. The flow of water is controlled at 0.81m / h, and the residual ammonia nitrogen value in the effluent is measured. The treatment results are shown in Table 1.

[0021] Table 1 Residual ammonia nitrogen value in effluent

[0022]

[0023] The results show that the ability of the expanded perlite to remove ammonia nitrogen after modification has been significantly improved.

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Abstract

The invention relates to modified expanded perlite for treating low-concentration ammonia-nitrogen wastewater and a wastewater treatment method. The method includes steps of placing the modified expanded perlite into an adsorption reaction groove or tank with upper and lower water inlet and outlet openings; tamping the adsorption reaction groove or tank to form a fixed absorption reaction bed; and feeding the low-concentration ammonia-nitrogen wastewater into the fixed absorption reaction bed from an upper water inlet tube port after the pH (potential of hydrogen) of the low-concentration ammonia-nitrogen wastewater is adjusted to a range from 7 to 9, and draining the low-concentration ammonia-nitrogen wastewater from a lower water drainage tube port. Accordingly the purpose of treating the wastewater is achieved. The modified expanded perlite is simple, and is low in cost and suitable for treating the low-concentration ammonia-nitrogen wastewater.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a modified expanded perlite for treating low-concentration ammonia nitrogen wastewater and a wastewater treatment method. Background technique [0002] Ammonia nitrogen in wastewater is one of the main substances for water eutrophication and environmental pollution, and it is also the most difficult component to degrade and remove. When the concentration of ammonia nitrogen in the water body exceeds 50mg / L, it will inhibit the natural nitrification, reduce the self-purification ability of the water body, and then cause the water body to lack oxygen and breed harmful aquatic organisms. At present, the methods commonly used at home and abroad to remove ammonia nitrogen mainly include biochemical method, air stripping method, chemical method, adsorption method and ion exchange method. Among them, the adsorption method and ion exchange method are often used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28
Inventor 罗逸文志敏
Owner WUHAN XINGTIANYU ENVIRONMENTAL ENG
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