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A preparation method and application of an external carbon source for denitrification

An external carbon source and denitrification technology, applied in chemical instruments and methods, anaerobic digestion treatment, water treatment parameter control, etc., can solve the problems of increasing the operating cost of urban sewage treatment plants, poor denitrification effect, and complicated operation process , to achieve resource utilization, rapid response, and short response time

Active Publication Date: 2020-08-04
JIANGNAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding commercial carbon sources greatly increases the operating cost of urban sewage treatment plants, so it is necessary to find suitable alternative carbon sources
Some studies have used cellulosic solid carbon sources as alternative carbon sources, such as ginkgo biloba leaves, camphor leaves, calamus, reed flowers, straw, wood chips, bark, pine branches and peanut shells, etc. Pretreatment, the operation process is more complicated, and secondly, the denitrification effect of some carbon sources is poor, such as the denitrification rate of bark and aloe flower is only 12.94% and 66.11%, in addition, the solid alternative carbon source loses more than the liquid carbon source Easy to use, fast response and other advantages

Method used

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  • A preparation method and application of an external carbon source for denitrification
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  • A preparation method and application of an external carbon source for denitrification

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Effect test

Embodiment 1

[0037] Embodiment 1: Cyanobacteria anaerobic fermentation produces acid

[0038] In this embodiment, the specific implementation steps of mixing the cyanobacteria pretreated with hot alkali and anaerobic granular sludge for anaerobic fermentation to produce acid are as follows:

[0039] The cyanobacteria are pretreated with hot alkali (pH 12, temperature 105°C, time 2h) to obtain a cyanobacteria pretreatment liquid. Take a 500mL reaction bottle, add 300mL cyanobacteria pretreatment solution, add seed sludge at a mass ratio of 1:5 to the substrate, and purge the headspace of the reaction bottle with high-purity nitrogen for 5 minutes to maintain an anaerobic environment. Reaction, fermentation time is 10d. After the fermentation mixture was centrifuged (8000rpm, 10min), the supernatant was taken and placed in a 4°C refrigerator for later use. The properties of the cyanobacteria anaerobic acid production fermentation broth are shown in Table 1.

[0040] In the cyanobacteria a...

Embodiment 2

[0043] Example 2: Effects of different pH values ​​on recovery of ammonia nitrogen in cyanobacteria anaerobic acid production fermentation broth by struvite precipitation method

[0044]Take 200mL of cyanobacteria anaerobic acid production fermentation liquid in a 500mL beaker, add potassium dihydrogen phosphate and magnesium chloride hexahydrate to make the molar ratio of Mg / P / N 1 / 1 / 1, adjust the pH of the solution with 6M sodium hydroxide solution , adjust the pH value to 8, 8.5, 9, 9.5, 10, 10.5, 11 respectively, stir with a magnetic stirrer at 300rpm, react for 30min, let stand for 30min, take the supernatant to measure various indicators.

[0045] figure 2 The effect of struvite precipitation method on recovery of ammonia nitrogen in cyanobacteria fermentation broth under different pH conditions. It can be seen that with the increase of pH, the removal of ammonia nitrogen first increases and then decreases. When the pH increased from 8 to 9, the removal rate of ammonia...

Embodiment 3

[0046] Example 3: Effects of different Mg and N molar ratios on struvite recovery from cyanobacteria anaerobic acid production fermentation liquid ammonia nitrogen

[0047] With reference to the operating steps of Example 2, the pH of the solution is adjusted to 9 with 6M sodium hydroxide solution, and the dosage of potassium dihydrogen phosphate is fixed, wherein the mol ratio of P / N is 1 / 1, and the consumption of magnesium chloride hexahydrate is changed Dosing amount, react under the condition that the molar ratio of Mg / N is 0.8 / 1, 1 / 1, 1.1 / 1, 1.2 / 1, 1.4 / 1, 1.6 / 1, 1.8 / 1, and use a magnetic stirrer at 300rpm Stir, react for 30 minutes, let stand for 30 minutes, take the supernatant to measure various indicators.

[0048] image 3 The effect of struvite precipitation to recover ammonia nitrogen in cyanobacteria anaerobic acidogenic fermentation broth under different Mg and N molar ratio conditions. It can be seen that the removal rate of ammonia nitrogen increases significa...

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Abstract

The invention discloses a preparation method and application of an external carbon source for denitrification, and belongs to the technical field of solid organic waste treatment and utilization and water treatment. The invention adopts struvite precipitation + calcium phosphate precipitation combination process to recover nitrogen and phosphorus in cyanobacteria anaerobic fermentation liquid, and the treated cyanobacteria anaerobic fermentation liquid can replace traditional commercial carbon source as an additional carbon source in the denitrification process , not only can provide a carbon source for the denitrification process, but also can significantly improve the denitrification capacity of sewage compared with commercial carbon sources. The operating cost of the sewage treatment plant turns "waste" into "treasure", killing two birds with one stone.

Description

technical field [0001] The invention relates to a preparation method and application of an external carbon source for denitrification, in particular to a technology for recovering nitrogen and phosphorus in cyanobacteria anaerobic fermentation liquid as an external carbon source, which belongs to the treatment and utilization of solid organic waste and water treatment technology field. Background technique [0002] In recent decades, with the acceleration of my country's industrialization process and the rapid development of social economy, a large amount of wastewater containing nitrogen and phosphorus has been discharged into water bodies, making Taihu Lake, one of my country's freshwater lakes, at the level of eutrophication. The eutrophication of lakes has led to large-scale outbreaks of blue-green algae, endangering the safety of drinking water, destroying the ecological environment and natural landscape, and causing great environmental problems. The disposal and resou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F101/16C02F101/10
CPCC02F3/28C02F2305/06C02F2209/02C02F2101/16C02F2101/105C02F1/5254C02F1/66C02F2103/007C02F9/00C02F1/5236C02F3/305
Inventor 赵明星李子阳张炜肖壮波黄兴华天予陆东亮施万胜阮文权
Owner JIANGNAN UNIV
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