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A kind of sewage dephosphorization agent and preparation method thereof

A phosphorus removal agent and sewage technology, which is applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc. It can solve the problems of weak phosphorus adsorption capacity, corrosion of pipelines and equipment, and yellow color of water. Achieve the effect of fast phosphorus removal and high phosphorus removal capacity

Active Publication Date: 2021-05-07
COCONUT RES INST OF CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problems to be solved: Perlite micropowder has a porous structure, but its chemical composition is mainly silicon dioxide, which has a weak adsorption capacity for phosphorus; the cost of polyferric sulfate is high, and excessive iron ions will cause the color of water to turn yellow and corrode pipelines and equipment; the cost of ferrous sulfate is low, but it needs to convert ferrous ions into ferric ions to play the role of phosphorus removal

Method used

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  • A kind of sewage dephosphorization agent and preparation method thereof
  • A kind of sewage dephosphorization agent and preparation method thereof
  • A kind of sewage dephosphorization agent and preparation method thereof

Examples

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Embodiment 1

[0017] Example 1: Add 550 g of ferrous sulfate heptahydrate to 1 L of water at 25 ° C, stir and dissolve to obtain a saturated ferrous sulfate solution, take 1 L of saturated ferrous sulfate solution, add 167 g of perlite micropowder, stir for 10 minutes, and let stand for 10 minutes , after removing the floating powder, use a vacuum filter (200 mesh filter screen) for suction filtration, and the filtrate after suction filtration is recovered to configure a saturated ferrous sulfate solution, and the precipitate after suction filtration is put into a muffle furnace for treatment at 300°C Hour, obtain 162g modified perlite micropowder after cooling, i.e. sewage dephosphorization agent. Use perlite micropowder as contrast, test the phosphorus adsorption isotherm of this embodiment dephosphorization agent, the result is as follows figure 2 shown. The phosphorus adsorption capacity of the phosphorus removal agent of this embodiment is significantly improved, and 25 g / L of the ph...

Embodiment 2

[0018] Example 2: Add 570 g of ferrous sulfate heptahydrate to 1 L of water at 30 ° C, stir and dissolve to obtain a saturated ferrous sulfate solution, take 1 L of saturated ferrous sulfate solution, add 125 g of perlite micropowder, stir for 5 minutes, and let stand for 10 minutes , after removing the floating powder, use a vacuum filter (200 mesh filter screen) for suction filtration, and the filtrate after suction filtration is recovered to configure a saturated ferrous sulfate solution, and the precipitate after suction filtration is put into a muffle furnace for treatment at 400°C for 1 Hour, obtain 123g modified perlite micropowder after cooling, i.e. sewage dephosphorization agent. When the simulated sewage phosphorus concentration is 50mg.L -1 When, add phosphorus removal agent 25g.L of the present invention -1 The phosphorus removal rate is 99.3%, and the residual phosphorus concentration in sewage is 0.35mg.L -1 , the phosphorus content is in line with the first c...

Embodiment 3

[0019] Example 3: Add 560g of ferrous sulfate heptahydrate to 1L of water at 28°C, stir and dissolve to obtain a saturated ferrous sulfate solution, take 1L of saturated ferrous sulfate solution, add 140g of perlite micropowder, stir for 8 minutes, and let stand for 10 minutes , after removing the floating powder, use a vacuum filter (200 mesh filter screen) for suction filtration, and the filtrate after suction filtration is recovered to configure a saturated ferrous sulfate solution, and the precipitate after suction filtration is placed in a muffle furnace for 1.5 Hour, obtain 136g modified perlite micropowder after cooling, i.e. sewage dephosphorization agent. When the phosphorus content is 100mg.L ‐1 Add 25g.L to the simulated sewage ‐1 The phosphorus removal agent of the present invention, after stirring for 10 minutes, the phosphorus removal rate can reach more than 98%.

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Abstract

The invention relates to a sewage phosphorus removal agent and a preparation method thereof. The method uses expanded perlite micropowder, a by-product in the production process of expanded perlite particles, as a carrier, and utilizes its characteristics of looseness, porosity, large specific surface area, and stable chemical properties. , a low-cost, high-efficiency sewage phosphorus removal agent was prepared by using ferrous sulfate for surface thermal modification. The sewage dephosphorization agent of the present invention has high dephosphorization ability for sewage with a pH of 3-6, and the dephosphorization speed is fast, and the adsorption can be completed in 10 minutes under sufficient contact conditions, and the sewage does not turn yellow after adsorption. When the simulated sewage phosphorus concentration is 50mg.L ‑1 When, add sewage dephosphorization agent 25g.L of the present invention ‑1 The phosphorus removal rate is 99.3%, and the residual phosphorus concentration in sewage is 0.35mg.L ‑1 , the phosphorus content is in line with the first class A discharge standard (≤0.5mg.L) of the national urban sewage treatment plant pollutant discharge standard (GB 18918) ‑1 ). The sewage dephosphorization agent of the invention has a certain application potential in the rapid dephosphorization treatment of acidic and high phosphorus sewage.

Description

technical field [0001] The invention belongs to the technical field of environmental adsorption materials, in particular to a sewage dephosphorization agent and a preparation method thereof. Background technique [0002] Adsorption is an effective way to remove phosphorus from sewage. Currently, commonly used adsorbents mainly include soil, slag, zeolite, activated carbon, bentonite, vermiculite, attapulgite, etc. These materials are difficult to balance cost and phosphorus removal efficiency. Perlite micropowder is a by-product of the production of expanded perlite particles. It is cheap and has a large specific surface area, but its main chemical composition is silica and lacks ion adsorption sites. Iron and aluminum reagents are commonly used sewage dephosphorization agents. Iron reagents include ferric and divalent iron. The cost of trivalent polyferric sulfate is higher, and the price of divalent iron reagents is lower, but it needs to be oxidized to ferric to be better...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/10
CPCB01J20/0229B01J20/0281B01J20/106C02F1/281C02F2101/105
Inventor 付登强杨伟波刘小玉余凤玉孙彦涛
Owner COCONUT RES INST OF CHINESE ACAD OF TROPICAL AGRI SCI
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