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Method for recovering phosphate in sewage by in-situ generation of calcium carbonate microsphere phosphate fertilizer and application of method

A technology of calcium carbonate microspheres and in-situ generation, which is applied in the fields of application, calcium fertilizer, sewage/sludge fertilizer, etc., to save time, positively promote growth, and benefit agricultural growth

Pending Publication Date: 2022-05-20
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of calcium reagents is usually only suitable for treating high-concentration phosphate wastewater, such as the formation of struvite, and the phosphate concentration in municipal wastewater is only at the mg / L level (Desmidt et al., 2013; Kataki et al., 2016)

Method used

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  • Method for recovering phosphate in sewage by in-situ generation of calcium carbonate microsphere phosphate fertilizer and application of method
  • Method for recovering phosphate in sewage by in-situ generation of calcium carbonate microsphere phosphate fertilizer and application of method
  • Method for recovering phosphate in sewage by in-situ generation of calcium carbonate microsphere phosphate fertilizer and application of method

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Experimental program
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Effect test

Embodiment 1

[0042] 1. In situ generation of calcium carbonate microsphere phosphate fertilizer

[0043] By simulating sewage from low concentration (NaH 2 PO 4 Solution, enriching phosphorus element in 10mg-P / L) prepares the method for in-situ generation calcium carbonate microsphere phosphate fertilizer, comprises the steps:

[0044] The preparation concentration is 38.73mg / L sodium dihydrogen phosphate (NaH 2 PO 4 ) solution (total phosphorus calculated as P is 10mg / L) to simulate low-concentration phosphorus-containing water (generally, more studies focus on phosphorus-containing water with phosphorus concentration exceeding 10mg-P / L, and less research on sewage with lower phosphorus concentration , so the sewage with phosphorus concentration ≤ 10mg-P / L is defined as the water body with low concentration of phosphorus). Under normal stirring state, first add calcium chloride (CaCl 2 , 1mol / L) solution until CaCl in the system 2 Concentration is 214.8mg / L, add sodium carbonate (Na...

Embodiment 2

[0054] The phosphorus removal effect of in-situ generation of calcium carbonate microsphere phosphate fertilizer and traditional synthetic calcium carbonate method under different Ca / P molar ratios includes the following steps:

[0055] (1) Phosphorus removal with different Ca / P molar ratios under the method of in-situ generation of calcium carbonate microsphere phosphate fertilizer. Under stirring, add sodium dihydrogen phosphate (NaH 2 PO 4 ) solution (total phosphorus calculated as P is 10mg / L) was successively added CaCl 2 solution until CaCl in the system 2 Concentration is 71.6, 143.2, 179, 214.8, 286.4 and 358mg / L, after reacting for 30min, take a sample to measure phosphorus content, then add Na 2 CO 3 solution until the Na in the system 2 CO 3 The concentrations were 68.4, 136.8, 171, 205.2, 273.6 and 342 mg / L, and the stirring was stopped after continuing the reaction for 30 minutes. Filter the water sample and measure the phosphorus content according to GB118...

Embodiment 3

[0059] Different Ca in Phosphate Fertilizer Method of In-Situ Generation of Calcium Carbonate Microspheres 2+ / CO 3 2- The phosphorus removal effect of molar ratio, comprises the steps:

[0060] With reference to the operating steps of Example 1, under stirring, to volume is 1L, concentration is 38.73mg / L sodium dihydrogen phosphate (NaH 2 PO4) solution (total phosphorus calculated as P is 10mg / L) is added with CaCl 2 solution until CaCl in the system 2 The concentration is 214.8mg / L, and the phosphorus content is measured by sampling, and then Na 2 CO 3 solution until the Na in the system 2 CO 3 Concentrations were 68.4, 102.6, 136.8, 307.8 and 410.4 mg / L, and the reaction was continued for 30 minutes before stirring was stopped. After the reaction, the water sample was filtered to determine the phosphorus content.

[0061] Figure 5 Different Ca in the phosphate fertilizer method that generates calcium carbonate microspheres in situ for embodiment 3 2+ / CO 3 2- ...

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Abstract

The invention discloses a method for recovering phosphate in sewage by in-situ generation of a calcium carbonate microsphere phosphate fertilizer and application of the method. According to the method, calcium chloride and a sodium carbonate solution are added into low-phosphate sewage, and a new strategy of efficient and rapid phosphorus recovery is realized by using in-situ calcium carbonate microspheres. According to the technology for in-situ generation of the calcium carbonate microsphere phosphate fertilizer, phosphate ions can be effectively captured and self-assembled into the composite calcium carbonate microspheres; under the optimized condition, 98% of phosphate can be recovered within 30 min, the residual phosphate amount is 0.2 mg-P / L, and compared with an existing method, time is saved. Importantly, 20.8 wt% of high-quality phosphate fertilizer can be obtained by adopting the novel calcium carbonate in-situ recovery strategy, and the content of the high-quality phosphate fertilizer is 4 times that of the prepared calcite calcium carbonate nanoparticles. The fast-growing vegetable pakchoi adopts the prepared sodium carbonate in-situ phosphate fertilizer to increase the yield by 58.9%. A new way is provided for recycling of the low-concentration phosphate fertilizer.

Description

technical field [0001] The invention relates to a technology for the removal of low-concentration phosphate and preparation of high-efficiency phosphate fertilizer on the basis thereof, in particular to a method for in-situ generation of calcium carbonate microsphere phosphate fertilizer to recover phosphate in sewage and its application. Background technique [0002] Rivers, lakes, seas and groundwater are all polluted in different areas and to varying degrees, endangering ecology and even human health. Phosphate is a typical pollutant that causes eutrophication when released into the aquatic environment. And phosphate rock, a non-renewable resource that supports the planet's large and growing population, is being depleted at an alarming rate. Therefore, the recovery of phosphate (P-recovery) from wastewater is becoming an increasingly urgent global environmental issue, playing a key role in the sustainable development of humans (Desmidt et al., 2014). [0003] At present...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G5/12
CPCC05D3/02C05G5/12C05F7/00C05F9/04Y02W10/37Y02A40/20
Inventor 陈桂葵周娟娟董康玉
Owner SOUTH CHINA AGRI UNIV
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