Porous nitrogen and phosphorus removal filler for constructed wetland and preparation method thereof

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: 2017-06-09
SHANGHAI JIAOTONG 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 constructed wetland and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] This embodiment relates to a porous denitrification and dephosphorization filler used in constructed wetlands. It uses sand, Yunnan red clay, cement, quicklime, gypsum, aluminum powder, water, etc. as the main raw materials, and uses steam pressure to produce foam. Yunnan red clay 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 the raw materials, mix 20% sand, 19% Yunnan red clay, 5% cement, 10.93% quicklime, 2% gypsum, and 43% water to make a mixed slurry. The measured slurry Put it into the pouring mixer;

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

[0035] 3. The temperature of the slurry before pouring should reach 35~38℃, if the temperature is not enough, it can be heated by steam;

[0036] 4. The pouring mixer di...

Embodiment 2

[0044] This embodiment relates to a porous denitrification and dephosphorization filler used in constructed wetlands. It uses sand, Yunnan red clay, cement, quicklime, gypsum, aluminum powder, water, etc. as the main raw materials, and uses steam pressure to produce foam. Yunnan red clay 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 the raw materials, mix 23% sand, 15% Yunnan red clay, 7% cement, 12% quicklime, 1.6% gypsum, and 41.35% water to make a mixed slurry. The measured slurry Put it into the pouring mixer;

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

[0048] 3. The temperature of the slurry before pouring should reach 35~38℃, if the temperature is not enough, it can be heated by steam;

[0049] 4. The pouring mixer...

Embodiment 3

[0056] This embodiment relates to a porous denitrification and dephosphorization filler used in constructed wetlands. It uses sand, Yunnan red clay, cement, quicklime, gypsum, aluminum powder, water, etc. as the main raw materials, and uses steam pressure to produce foam. Yunnan red clay 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 the raw materials, mix 25% sand, 20% Yunnan red clay, 6% cement, 9% quicklime, 1.94% gypsum, and 38% water to make a mixed slurry. The measured slurry Put it into the pouring mixer;

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

[0060] 3. The temperature of the slurry before pouring should reach 35~38℃, if the temperature is not enough, it can be heated by steam;

[0061] 4. The pouring mixer dis...

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Abstract

The invention discloses a preparation method of a porous filler for denitrification and dephosphorization used in artificial wetlands, which comprises the following steps: measuring sand, Yunnan red soil, cement, quicklime, gypsum, and water according to the weight formula ratio, and then stirring evenly to form a mixture The slurry is put into the pouring mixer; the aluminum powder is made into a suspension according to the measurement, and put into the pouring mixer before pouring; the pouring mixer discharges the material and pours it into the mold to obtain a green body; Under the condition of ℃, carry out gas generation and initial setting for 1.5-2 hours to obtain rough filler; after the rough filler is statically stopped for initial curing and reaches the cutting strength, it is then cut; the cut rough filler is autoclaved and cured, that is have to. The filler prepared by the invention is used for sewage treatment, has light bulk density, stable chemical properties, easy film formation, large porosity, high mechanical strength, excellent phosphorus removal performance and good ammonia nitrogen removal effect.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a preparation method of a porous denitrification and phosphorus removal filler used in constructed wetlands. Background technique [0002] There are three main elements for sewage purification in constructed wetlands: filler matrix, plants and microorganisms. Among them, filler is the main place for sewage treatment, which directly removes pollutants through interception, filtration, adsorption, and precipitation. [0003] Currently widely used fillers, whether they are traditional natural fillers (gravel, zeolite, limestone, etc.) or industrial by-products (ash, blast furnace slag, steel slag, etc.), have low specific surface area, low porosity, nitrogen and phosphorus removal Problems such as poor results. Yunnan red soil is the most widely distributed soil type in Yunnan. The unique weathering conditions in Yunnan mountains make Fe in Yunnan red soil 2 O ...

Claims

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Application Information

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Patent Type & Authority Patents(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 JIAOTONG UNIV
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