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Functional material for removing nitrate nitrogen in water and preparation and application methods thereof

A technology of functional materials and nitrate nitrogen, which is applied in chemical instruments and methods, water pollutants, biological water/sewage treatment, etc., can solve the problems of mineral-microbe interfaces that are difficult to maintain close contact, chemical oxidation, and biological oxidation. Long hydraulic retention time and other issues, to achieve high chemical and biochemical reactivity, low crystallinity, and reduce molding energy consumption

Pending Publication Date: 2021-02-23
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, pyrite belongs to parasulfide. Two sulfur atoms are covalently bonded to form a dumbbell shape. The chemical bond is strong. The chemical oxidation and biological oxidation speed of pyrite are very small, and the required hydraulic retention time is relatively long. The efficiency of pyrite denitrification by the autotrophic microorganism Thiobacillus denitrificans is low, so it is necessary to select sulfides with high biological activity as electron acceptors for the reduction of nitrate by Thiobacillus denitrificans; secondly, various sulfide raw materials, such as pyrite Mineral concentrate powder (high-sulfur fine powder) and pyrrhotite fine ore powder (low-sulfur fine powder) are generally by-products of sulfide ore flotation, and the raw material particles are fine, so they need to be suspended and precipitated for direct use in water treatment separation, it is difficult to maintain the mineral-microbe interface in close contact; third, Thiobacillus denitrification is an anaerobic microorganism, which cannot play a role in an aerobic system, and water always contains a certain amount of dissolved oxygen. How to use technology for denitrification Anaerobic microorganisms such as Azobacillus provide an anaerobic ecological environment, and promoting the metabolism of such microorganisms to reduce nitrate is the key issue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of functional materials for removing nitrate nitrogen in water

[0036] (1) Purchase chemical by-product sulfur powder (purity 99%), pass through a 100 mesh sieve; select pyrrhotite concentrate powder (pyrhotrite content 90%), pass through a 100 mesh sieve; collect sawdust, pulverize through a 1mm sieve ; Choose No. 425 ordinary Portland cement as the binder.

[0037] (2) Take by weighing 7kg of sulfur powder (accounting for 70% by weight), 1.5kg of pyrrhotite concentrate powder (accounting for 15% by weight), 0.2kg of sawdust powder (accounting for 2% by weight), No. 425 ordinary silicic acid Salt cement 1.3kg (accounting for 13% by weight);

[0038]Mix the raw materials evenly according to the proportion; add 3kg of water (accounting for 30% of the weight of the mixture) to the obtained mixture, and stir to become a wet and loose material; 5mm rod-shaped particles.

[0039] (3) Pile the formed particles in a humid saturated water environment, and cur...

Embodiment 2

[0048] 1. Preparation of functional materials for removing nitrate nitrogen in water

[0049] (1) buy chemical by-product sulfur powder (purity 99%), cross 100 mesh sieves; select colloidal pyrite powder (pyrite content greater than 90%), cross 100 mesh sieves; collect shavings, pulverize and cross 1mm sieves; Choose 800℃ calcined dolomite powder as binder.

[0050] (2) Take by weighing 6.2kg of sulfur powder (accounting for 62% by weight), 1.5kg of colloidal pyrite powder (accounting for 15% by weight), 0.3kg of shaving powder (accounting for 3% by weight), 800 ℃ calcined dolomite Powder 2kg (accounting for 20% by weight);

[0051] Mix the raw materials evenly according to the proportion; add 3kg of water (accounting for 30% of the weight of the mixture) to the obtained mixture, and stir to become a wet and loose material; 8mm rod-shaped particles.

[0052] (3) Store the formed particulate matter in a CO-enriched 2 In the environment, carbonation is completed after curing...

Embodiment 3

[0056] 1. Preparation of functional materials for removing nitrate nitrogen in water

[0057] (1) buy chemical by-product sulfur powder (purity 99%), cross 100 mesh sieves; select the vulcanization product of limonite at 600-650 ℃ (pyrhotrite content is 50%), cross 100 mesh sieves; collect rape The straw is crushed and passed through a 1mm sieve; lime powder is selected as the binder.

[0058] (2) Take by weighing 6.2kg of sulfur powder (accounting for 62% by weight), 1.5kg of sulfurized limonite powder (accounting for 15% by weight), 0.3kg of rape straw (accounting for 3% by weight), 2kg of lime powder (accounting for 15% by weight), than 20%);

[0059] Mix the raw materials evenly according to the proportion; add 3kg of water (accounting for 30% of the weight of the mixture) to the obtained mixture, and stir to become a wet and loose material; 8mm rod-shaped particles.

[0060] (3) Store the formed particulate matter in a CO-enriched 2 In the environment, carbonation is ...

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Abstract

The invention discloses a functional material for removing nitrate nitrogen in water and preparation and application methods thereof. The functional material is obtained by taking sulfur powder and high-activity iron-manganese sulfide powder as main raw materials and taking biomass fibers and a binder as additives, uniformly mixing the raw materials, adding water for molding, and then curing to finish hydration or carbonation. mixing functional material and limestone or dolomite particles and then fillinginto a biological filter, inoculating thiobacillus and culturing until a biological membrane is mature, and treating the wastewater in an upwelling mode according to the hydraulic retention time of 1-5h so that the removal rate of nitrate nitrogen in the wastewater reaches 80% or above.

Description

technical field [0001] The invention relates to a functional material for removing nitrate nitrogen in water and a preparation and application method thereof, belonging to the technical field of water treatment. Background technique [0002] With the aggravation of water pollution, eutrophication has generally occurred in surface water bodies in my country, which requires more stringent denitrification and phosphorus removal treatments for sewage. Biological denitrification of wastewater is the main denitrification technology. Usually, the organic nitrogen and ammonia nitrogen in the wastewater are gradually converted into nitrate nitrogen through the action of nitrifying bacteria, and then the nitrate nitrogen is converted into nitrogen gas through denitrifying bacteria. However, industrial wastewater and domestic sewage generally have the problem of low C / N ratio, resulting in insufficient carbon sources for denitrification and denitrification. Therefore, wastewater treatm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/28C02F101/30C02F101/16
CPCC02F3/34C02F3/2806C02F2101/30C02F2101/16
Inventor 陈天虎邹雪华张雪妹
Owner HEFEI UNIV OF TECH
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