Method for preparing struvite by treating nitrogen and phosphorus-containing wastewater with rice husk carbon

A technology of rice husk charcoal and struvite, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of high operating cost of struvite and unfavorable large-scale application

Inactive Publication Date: 2020-08-04
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

As a result, the released magnesium ions react chemically with the phosphate and ammonium in the wastewater containing nitrogen and phosphorus under this alkaline condition. After the reaction, struvite is obtained through crystallization and precipitation. Rice husk charcoal can be used as an additive to effectively reduce the The amount of magnesium metal does not require the use of chemicals, and the recovery rate of nitrogen and phosphorus is significantly improved, as well as the rate and purity of struvite formation, etc., thereby solving the problem of high operating costs and unfavorable large-scale production of struvite by electrochemically treating wastewater containing nitrogen and phosphorus in the prior art. Technical Issues of Scale Application

Method used

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  • Method for preparing struvite by treating nitrogen and phosphorus-containing wastewater with rice husk carbon
  • Method for preparing struvite by treating nitrogen and phosphorus-containing wastewater with rice husk carbon
  • Method for preparing struvite by treating nitrogen and phosphorus-containing wastewater with rice husk carbon

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Effect test

Embodiment 1

[0060] exist figure 1 In the constructed double-chamber struvite device, the struvite reaction chamber and the struvite precipitation chamber are both made of plexiglass material. Both chamber volumes are 10L. The effluent from an anaerobic pond of a pig farm in Wuhan City, Hubei Province was used as feed wastewater. Before the wastewater enters the device, it is pretreated to remove some particles, suspended solids and impurities. NH after pretreatment 4 + -N concentration is 95.43mg / L, PO 4 3- -P concentration was 45.97 mg / L, and initial pH was 7.25. The rice husk charcoal was sieved and pretreated through a 300-mesh sieve. The composition of the rice husk charcoal is shown in Table 1. Among them, the particle size after pretreatment was about 40 μm, washed 3 times with water and the solid-to-liquid ratio was 1:4 The rice husk charcoal is used as a spare. First, add 7.88g of rice husk charcoal to each liter of waste water. When the pH in the solution is 8-8.5, contin...

Embodiment 2

[0062] exist figure 1 In the constructed double-chamber struvite device, the struvite reaction chamber and the struvite precipitation chamber are both made of plexiglass material. The volume of both chambers is 10L (that is, the volume of wastewater in this embodiment is 10L). The effluent from an anaerobic pond of a pig farm in Wuhan City, Hubei Province was used as feed wastewater. Before the wastewater enters the device, it is pretreated to remove some particles, suspended solids and impurities. NH after pretreatment 4 +-N concentration is 95.43mg / L, PO 4 3- -P concentration was 45.97 mg / L, and initial pH was 7.25. The rice husk charcoal was sieved and pretreated through a 300-mesh sieve. The composition of the rice husk charcoal is shown in Table 1. Among them, the particle size after pretreatment was about 20 μm, washed 3 times with water and the solid-to-liquid ratio was 1:2 The rice husk charcoal is used as a spare. First, add 6.66g of rice husk charcoal to each...

Embodiment 3

[0066] exist figure 1 In the constructed double-chamber struvite device, the struvite reaction chamber and the struvite precipitation chamber are both made of plexiglass material. Both chamber volumes are 10L. The effluent from an anaerobic pond of a pig farm in Wuhan City, Hubei Province was used as feed wastewater. Before the wastewater enters the device, it is pretreated to remove some particles, suspended solids and impurities. NH after pretreatment 4 + -N concentration is 325.6mg / L, PO 4 3- -P concentration was 151.8 mg / L, and initial pH was 7.31. The rice husk charcoal sifted through a 300-mesh sieve and pretreated, the composition of the rice husk charcoal is shown in Table 1. Among them, the pretreated particle size is about 40 μm, washed three times with water, and the solid-liquid ratio is 1:4. Rice husk charcoal for use. First, add 7.88g of rice husk charcoal to each liter of waste water. When the pH in the solution is 8-8.5, continue to add 5.63g of magnesi...

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a method for preparing struvite by treating nitrogen and phosphorus-containing wastewater with rice husk carbon. By using the rice husk carbon, on one hand, the initial pH of a solution can be adjusted; on the other hand, the self-corrosion effect of magnesium metal in the reaction process can be accelerated to release a large number of magnesium ions, meanwhile, electrons can be obtained according to chemical equilibrium of water in the wastewater to generate a large number of hydroxide radicals, andtherefore the pH in the solution is further increased. Therefore, the released magnesium ions and phosphate radicals and ammonium radicals in the phosphorus-containing wastewater are subjected to a chemical reaction under the alkaline condition, and the struvite is obtained through crystallization and precipitation after the reaction. The rice husk carbon as an additive can effectively reduce themagnesium metal consumption, does not need to use chemicals, and obviously enhances the nitrogen / phosphorus recovery rate, struvite generation rate, struvite purity and the like, thereby solving the technical problems of high operating cost and unfavorable large-scale application in the struvite preparation by electrochemically treating the nitrogen and phosphorus-containing wastewater in the prior art.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a method for preparing struvite by using rice husk charcoal to treat wastewater containing nitrogen and phosphorus. Background technique [0002] With the development of industrial and agricultural production and the improvement of people's living standards, the discharge of nitrogen and phosphorus pollutants in my country has increased sharply. In the process of "one control and two standards", organic sewage, especially industrial organic waste water, has been effectively treated, but nitrogen and phosphorus pollution has basically not been controlled. The eutrophication of water bodies caused by nitrogen and phosphorus pollution is very serious. Lake "algae blooms" and offshore "red tides" occur from time to time and become more and more intense. Eutrophication of water bodies has endangered agriculture, fishery, tourism and many other industries, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C01B3/08C02F9/06C02F101/10C02F101/16
CPCC01B3/08C01B25/451C02F1/46176C02F1/58C02F1/586C02F1/66C02F9/00C02F2001/46133C02F2101/105C02F2101/16Y02E60/36
Inventor 吴旭王芳邹晓宇魏佳普
Owner HUAZHONG UNIV OF SCI & TECH
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