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Sewage phosphorus removal agent and preparation method thereof

A phosphorus removal agent and sewage technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of secondary pollution of phosphorus, achieve less usage, convenient recycling, Good purification effect

Pending Publication Date: 2022-07-08
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption method has a wide range of applications, but due to the influence of the saturated adsorption capacity of the material and the pH of the water body, the adsorbed phosphorus is easily released to the water body, resulting in secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of a sewage phosphorus removal treatment agent comprises the following steps:

[0041] (1) Preparation of modified gypsum: The natural gypsum was kept in an oven at 120 ° C for 2 hours, and after natural cooling, it was ground and passed through a 100-mesh sieve;

[0042] (2) Preparation of biochar: The collected rice straw was washed with deionized water, dried at 50 °C for 12 h, heated to 700 °C at a heating rate of 10 °C / min in a vacuum tube furnace, and aerated at 1 L / min throughout the process. Nitrogen gas was introduced at a certain rate, and after pyrolysis for 1 hour, biochar was obtained, and after natural cooling, it was ground to 50 mesh;

[0043] (3) The 1:1 modified gypsum and biochar are evenly mixed by mass to obtain the phosphorus removal agent.

[0044] Add 1 g of the phosphorus remover prepared in Example 1 to 1 L of sewage with a total phosphorus concentration of 1 mg / L and pH=6.5, and mix thoroughly. L, the phosphorus removal ...

Embodiment 2

[0046] A preparation method of a sewage phosphorus removal treatment agent comprises the following steps:

[0047] (1) Preparation of modified gypsum: The natural gypsum was kept in an oven at 120 ° C for 2 hours, and after natural cooling, it was ground and passed through a 100-mesh sieve;

[0048] (2) Preparation of biochar: The collected soybean straw was washed with deionized water and dried at 50°C for 12h. Heating to 600°C at a heating rate of 15°C / min in a vacuum tube furnace, feeding nitrogen at a ventilation rate of 1L / min throughout the process, pyrolyzing for 1 hour, to obtain biochar, after natural cooling, grinding to 35 mesh;

[0049] (3) The 3:7 modified gypsum and biochar are evenly mixed according to the mass ratio, namely, the phosphorus removal agent is obtained.

[0050] Add 1 g of the phosphorus removal agent prepared in Example 2 to 1 L of sewage with a total phosphorus concentration of 5 mg / L and pH=7, and after thorough mixing, the total phosphorus con...

Embodiment 3

[0052] A preparation method of a sewage phosphorus removal treatment agent comprises the following steps:

[0053] (1) Preparation of modified gypsum: The natural gypsum was kept in an oven at 120 ° C for 2 hours, and after natural cooling, it was ground and passed through a 100-mesh sieve;

[0054] (2) Preparation of biochar: The collected corn stalks were washed with deionized water and dried at 50 °C for 12 h. Heating to 650°C at a heating rate of 12°C / min in a vacuum tube furnace, feeding nitrogen gas at a ventilation rate of 1L / min throughout, pyrolysis for 1 hour, to obtain biochar, after natural cooling, grinding to 45 mesh;

[0055] (3) The 4:6 modified gypsum and the biochar are evenly mixed according to the mass ratio to obtain the phosphorus removing agent.

[0056] Add 5g of the phosphorus removal agent prepared in Example 3 to 1L of sewage with a total phosphorus concentration of 50mg / L and pH=8.0, and after thorough mixing, the total phosphorus concentration in ...

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PUM

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Abstract

The invention discloses a sewage phosphorus removal agent and a preparation method thereof, the phosphorus removal agent is composed of modified gypsum and biochar, and the biochar is a plant raw material. The preparation method comprises the following steps: cleaning plant raw materials with deionized water, drying, pyrolyzing for 1 hour by adopting an oxygen-limited heating carbonization method, and grinding for later use; the natural gypsum is subjected to heat preservation in a 120 DEG C drying oven for 2 hours, naturally cooled, ground and sieved by a 100-mesh sieve. 30-60% of gypsum and 70-40% of charcoal are mixed uniformly, and the phosphorus removal agent is obtained. According to the content of total phosphorus in the sewage, a phosphorus removal agent which is 0.1-0.5% of the mass of a water body is added into the sewage, and a good phosphorus removal effect can be achieved after reaction is carried out for 3 days. The raw materials are cheap and easy to obtain, and the modification processing technology is simple. The dephosphorization agent is small in usage amount, does not need special treatment, and is low in operation cost. And after treatment, inorganic phosphate formed by crystallization on the surface of the phosphorus removal agent is insoluble in water, so that secondary pollution of a water body is avoided. The device is suitable for treatment of phosphorus-containing sewage with different concentrations, has a good purification effect on phosphorus-containing sewage with different pH values, and is less affected by water temperature.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a preparation method of a sewage phosphorus removal agent and a sewage phosphorus removal agent prepared by the preparation method. Background technique [0002] With the development of phosphorus chemical industry such as agriculture and detergents, it is more and more common for the phosphorus content in natural water to exceed the standard. Phosphorus is the most important factor for the growth of planktonic algae and is one of the main causes of eutrophication of water bodies. Controlling phosphorus concentration in water is a key technology to solve the problem of eutrophication in water. [0003] Water phosphorus removal technology can be divided into: chemical method, biological method, adsorption method, crystallization method. The chemical phosphorus removal method is to add chemicals into the sewage to generate insoluble salts, form flocs and then separate fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/04B01J20/045B01J20/20C02F1/283C02F1/281C02F2101/105Y02W10/40
Inventor 孙遥徐冠立柏涵
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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