Porous nitrogen and phosphorus removal filler for artificial wetland and preparation method of porous nitrogen and phosphorus removal filler

A technology for denitrification and phosphorus removal, constructed wetlands, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. Small load and other problems, to achieve the effect of low production cost, increased specific surface area, and small specific gravity

Active Publication Date: 2015-09-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the fillers widely used at present, whether they are traditional natural fillers (gravel, zeolite, limestone, etc.) Poor effect and other issues
Yunnan red soil is the most widely distributed soil type in Yunnan, and the unique weathering conditions of Yunnan mountains make the Fe in Yunnan red soil 2 o 3 and TiO 2 The content is much higher than that of red soil in other regions. Yunnan red soil has a high potential for pollution removal, but there are problems such as low hydraulic load and easy clogging when directly using red soil as a water treatment substrate

Method used

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  • Porous nitrogen and phosphorus removal filler for artificial wetland and preparation method of porous nitrogen and phosphorus removal filler

Examples

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Effect test

Embodiment 1

[0031] This example relates to a porous nitrogen and phosphorus removal filler used in constructed wetlands, which uses sand, Yunnan red soil, cement, quicklime, gypsum, aluminum powder, water, etc. as the main raw materials, and uses steam pressurization to produce foam Yunnan red soil is immobilized to make porous materials.

[0032] The specific preparation mainly includes the following process steps:

[0033] 1. According to the mass percentage of the total weight of raw materials, mix 20% of sand, 19% of Yunnan red soil, 5% of cement, 10.93% of quicklime, 2% of gypsum, and 43% of water to make a mixed slurry. The measured slurry Put into pouring mixer;

[0034] 2. Make a suspension of 0.07% aluminum powder, stir for about 30s, and put the stirred suspension into the pouring mixer about 1 minute before pouring;

[0035] 3. The temperature of the slurry should reach 35-38°C before pouring. If the temperature is not enough, it can be heated by steam;

[0036] 4. The pouri...

Embodiment 2

[0044] This example relates to a porous nitrogen and phosphorus removal filler used in constructed wetlands, which uses sand, Yunnan red soil, cement, quicklime, gypsum, aluminum powder, water, etc. as the main raw materials, and uses steam pressurization to produce foam Yunnan red soil is immobilized to make porous materials.

[0045] The specific preparation mainly includes the following process steps:

[0046] 1. According to the mass percentage of the total weight of raw materials, mix 23% of sand, 15% of Yunnan red soil, 7% of cement, 12% of quicklime, 1.6% of gypsum, and 41.35% of water to make a mixed slurry. The measured slurry Put into pouring mixer;

[0047] 2. Make a suspension of 0.05% aluminum powder, stir for about 30s, and put the stirred suspension into the pouring mixer about 2 minutes before pouring;

[0048] 3. The temperature of the slurry should reach 35-38°C before pouring. If the temperature is not enough, it can be heated by steam;

[0049] 4. The po...

Embodiment 3

[0056] This example relates to a porous nitrogen and phosphorus removal filler used in constructed wetlands, which uses sand, Yunnan red soil, cement, quicklime, gypsum, aluminum powder, water, etc. as the main raw materials, and uses steam pressurization to produce foam Yunnan red soil is immobilized to make porous materials.

[0057] The specific preparation mainly includes the following process steps:

[0058]1. According to the mass percentage of the total weight of raw materials, mix 25% of sand, 20% of Yunnan red soil, 6% of cement, 9% of quicklime, 1.94% of gypsum, and 38% of water to make a mixed slurry. The measured slurry Put into pouring mixer;

[0059] 2. Make a suspension of 0.06% aluminum powder, stir for about 30s, and put the stirred suspension into the pouring mixer about 1 minute before pouring;

[0060] 3. The temperature of the slurry should reach 35-38°C before pouring. If the temperature is not enough, it can be heated by steam;

[0061] 4. The pouring...

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Abstract

The invention discloses porous nitrogen and phosphorus removal filler for an artificial wetland and a preparation method of the porous nitrogen and phosphorus removal filler. The preparation method comprises the following steps: uniformly stirring sands, Yunnan red soil, cement, quick lime, gypsum and water which are metered in proportion by weight to prepare mixed slurry and putting the mixed slurry into a pouring stirrer; preparing aluminum powder into a suspension liquid and putting the suspension liquid into the stirrer before being poured; discharging and pouring a material by the pouring stirrer into a die to prepare a blank; foaming and initially setting the poured blank at 50-70 DEG C for 1.5-2 hours to obtain coarse filler; standing the coarse filler for initial maintaining until the coarse filler has cutting strength and cutting the coarse filler; and autoclaving the cut coarse filler to obtain the porous nitrogen and phosphorus removal filler. The filler disclosed by the invention is used for sewage treatment, is light in volume-weight, stable in chemical property, liable to biofilm culturing, great in porosity and high in mechanical strength, and has an excellent phosphorus removal property and a relatively good ammonia nitrogen removing effect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of a porous filler for denitrification and dephosphorization used in artificial wetlands. Background technique [0002] There are three main elements in constructed wetland sewage purification: filler matrix, plants and microorganisms. Among them, filler is the main place for sewage treatment, and pollutants are directly removed through interception, filtration, adsorption, precipitation and other functions. [0003] Among the fillers widely used at present, whether they are traditional natural fillers (gravel, zeolite, limestone, etc.) problems such as poor performance. Yunnan red soil is the most widely distributed soil type in Yunnan, and the unique weathering conditions of Yunnan mountains make the Fe in Yunnan red soil 2 o 3 and TiO 2 The content is much higher than that of red soil in other regions. Yunnan red soil has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
Inventor 王欣泽沈剑封吉猛隋艳明张琳琳张震宇杨明刘德才
Owner SHANGHAI JIAO TONG UNIV
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