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A light-weight slow-release denitrification and dephosphorization material and its preparation method and application

A denitrification and phosphorus removal, lightweight technology, used in applications, other household appliances, chemical instruments and methods, etc., can solve the problem of high density and heavy pyrite packing, which cannot be used in fluidized bed reactors and biological filters. Filler blockage and other problems, to achieve the effect of controllable density, easy microbial film hanging, and not easy to block

Active Publication Date: 2020-10-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the high density of traditional pyrite packing in the existing pyrite autotrophic denitrification technology, when used as a biofilter packing, the weight is too large to be used in a fluidized bed reactor; although the particle size of pyrite powder is small, denitrification and removal The phosphorus rate is relatively high, but it is easy to cause problems such as clogging when used as a biofilter filler. The invention provides a light-weight slow-release nitrogen and phosphorus removal material and its preparation method and application

Method used

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  • A light-weight slow-release denitrification and dephosphorization material and its preparation method and application
  • A light-weight slow-release denitrification and dephosphorization material and its preparation method and application

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Embodiment 1

[0035] In this embodiment, 800 g of pyrrhotite with a sulfur grade of 45%-50% from Anhui Province and a particle size of less than 0.3 mm was selected.

[0036] Mix 20% cement, 75% pyrrhotite, 4.99% foaming agent sodium percarbonate, and 0.01% foam stabilizer calcium stearate in mass percentage, and continue stirring during the mixing process, and the stirring speed is 30r / min, the stirring time is 60s to obtain a uniform dry powder mortar; add water to the dry powder mortar, the quality of the added water is 30% of the dry powder mortar quality, pour the above mortar with water into the cement mortar mixer Stirring is carried out, the stirring speed is 180r / min, and the stirring time is 200s. After the stirring reaction, a light-weight slow-release denitrification and phosphorus removal material is prepared. The obtained lightweight slow-release denitrification and phosphorus removal material is made into a standard test block of 15cm*15cm*15cm, and it is ready to use after 10...

Embodiment 2

[0039] The basic content of this embodiment is the same as that of Embodiment 1, except that: this embodiment selects 800 g of pyrite with a sulfur grade of 30%-34% from Guangdong, and the particle size is less than 0.3 mm.

[0040] Mix 65% cement, 30% pyrite, 0.1% foaming agent hydrogen peroxide, and 4.9% surfactant type foam stabilizer fatty acid ethanolamide in mass percentage, and continue stirring during the mixing process, and the stirring speed is 200r / min, the stirring time is 20s to obtain a uniform dry powder mortar; add water to the dry powder mortar, the quality of the added water is 70% of the dry powder mortar quality, pour the above mortar with water into the cement mortar mixer Stirring is carried out, the stirring speed is 250r / min, and the stirring time is 100s. After the stirring reaction, a light-weight slow-release denitrification and phosphorus removal material is prepared. The obtained lightweight slow-release denitrification and phosphorus removal mate...

Embodiment 3

[0043] The basic content of this embodiment is the same as that of Embodiment 1, except that: this embodiment selects 800 g of pyrite with a sulfur grade of 45%-48% from Hunan and a particle size of 0.3 mm.

[0044] Mix 50% cement, 40.5% pyrite, 5% foaming agent sodium dodecylbenzene sulfonate, and 4.5% foam stabilizer calcium stearate in mass percentage, and continuously stir during the mixing process. The speed is 60r / min, and the stirring time is 50s to obtain a uniform dry powder mortar; add water to the dry powder mortar, the quality of the added water is 50% of the quality of the dry powder mortar, pour the above mortar with water into Stirring is carried out in a cement mortar mixer, the stirring speed is 300r / min, and the stirring time is 60s. After the stirring reaction, a light slow-release denitrification and phosphorus removal material is prepared. The obtained lightweight slow-release denitrification and phosphorus removal material is made into a standard test blo...

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Abstract

The invention discloses a lightweight slow-release nitrogen and phosphorus removal material and a preparation method and application thereof, and belongs to the field of environment function materialsand sewage treatment. The preparation method comprises the following steps: uniformly mixing cement, pyrite, a foaming agent and a foam stabilizer to obtain dry-mixed mortar; adding water into the dry-mixed mortar, and stirring to prepare the lightweight slow-release nitrogen and phosphorus removal material. The lightweight slow-release nitrogen and phosphorus removal material of the invention has characteristics of high specific surface area, controllable density, high reactivity, easy microbial biofilm formation, slow-release electron donor nitrogen-removal and iron ion phosphorus-removal,etc., can be used as a filling material for sewage treatment fluidized beds and fixed beds, a filling materials for constructed wetlands and in-situ and ex-situ purifying material for polluted water bodies, and has a good purifying effect on pollutants in water, especially on total nitrogen and total phosphorus.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and sewage treatment, and more specifically relates to a light slow-release denitrification and dephosphorization material and its preparation method and application. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization, water pollution is becoming more and more serious. In order to control water pollution, the state has invested heavily in the construction of sewage treatment facilities. At present, sewage treatment methods can be roughly divided into three types: physical method, biological method and chemical method, among which the relative cost of biological method is the lowest and the most widely used. [0003] With the continuous deepening of research on treatment methods, some minerals that are widely distributed but have not been rationally utilized have also been applied to sewage biological treatment met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B38/02C04B38/10C02F3/30
CPCC02F3/308C02F2209/08C02F2209/14C02F2209/15C02F2209/18C04B28/00C04B2201/20C04B14/36C04B2103/48C04B22/10C04B38/02C04B22/068C04B24/20C04B38/10
Inventor 李睿华罗黎煜关梦莎王卫葛志斌周立松沈思文
Owner NANJING UNIV
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