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A method for synchronous nitrification and denitrification treatment of low c/n ratio micro-polluted eutrophic water body

A simultaneous nitrification and eutrophication technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as secondary pollution and increased cost of sulfur-containing chemicals

Active Publication Date: 2020-03-27
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, the combination of heterotrophic and autotrophic denitrification to achieve efficient denitrification has become a major research hotspot. Compared with single heterotrophic denitrification, autotrophic denitrification can get rid of the limitation of available organic matter and reduce sludge. The amount of production and the release of nitrogen oxides, while greatly improving the performance of denitrification, such as adding sulfur or sulfide to the autotrophic denitrification bioreactor, although the denitrification performance has been greatly improved , but the addition of sulfur-containing chemicals not only increases the cost but also tends to cause secondary pollution, so choosing an economical and environmentally friendly carbon source to achieve the combination of autotrophic and heterotrophic denitrification functions has aroused great interest of researchers

Method used

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  • A method for synchronous nitrification and denitrification treatment of low c/n ratio micro-polluted eutrophic water body
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  • A method for synchronous nitrification and denitrification treatment of low c/n ratio micro-polluted eutrophic water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take polyurethane suspension filler and fill it into a cylindrical plastic bioreactor with a filling rate of 7.6% (v / v), and configure the influent with a low C / N ratio micro-polluted eutrophic water body, and the pH and temperature of the influent are 7.0-8.0 respectively and 25±2°C, and set the hydraulic retention time to 24h, run the biofilm reactor, the whole experiment is divided into two stages, the first stage runs for 60d: there is only polyurethane suspension filler in the biofilm reactor; the second stage (61 -100d), add two bags of pomelo peels to the biofilm reactor, and regularly measure the concentration of ammonia nitrogen, total nitrogen, and organic matter (total organic carbon) in and out of the water during the experiment, and calculate the removal rate. The experimental results are shown in Table 1.

[0028] Table 1

[0029] Ammonia nitrogen removal percentage Total Nitrogen Removal Percentage COD percentage 20d 34.35％ 5.76％ 30....

Embodiment 2

[0031] Take SPR-1 suspended filler and fill it into a cylindrical plastic bioreactor with a filling rate of 7.6% (v / v), and configure the influent with a low C / N ratio, slightly polluted and eutrophic water body, and the pH and temperature of the influent water are respectively 7.0 ~8.0 and 25±2℃, and set the hydraulic retention time to 24h, run the biofilm reactor, the whole experiment is divided into two stages, the first stage runs for 60d: only SPR-1 suspended filler in the biofilm reactor; In the second stage (61-100d), two bags of pomelo peels were added to the biofilm reactor. During the experiment, the concentration of ammonia nitrogen, total nitrogen, and organic matter (total organic carbon) in the influent and effluent water was regularly measured, and the removal rate was calculated. The experimental results are shown in the table 2.

[0032] Table 2

[0033] Ammonia nitrogen removal percentage Total Nitrogen Removal Percentage COD percentage 20...

Embodiment 3

[0035] Take the elastic filler and fill it into a cylindrical plastic bioreactor with a filling rate of 7.6% (v / v). The influent is configured as a eutrophic water body with a low C / N ratio. The pH and temperature of the influent are 7.0-8.0 and 25± 2°C, and set the hydraulic retention time to 24h, run the biofilm reactor, the whole experiment is divided into two stages, the first stage runs for 60d: there is only elastic filler in the biofilm reactor; the second stage (61-100d), Two bags of pomelo peels were added to the biofilm reactor. During the experiment, the concentration of ammonia nitrogen, total nitrogen, and organic matter (total organic carbon) in the influent and effluent water was regularly measured, and the removal rate was calculated. The experimental results are shown in Table 3.

[0036] table 3

[0037] Ammonia nitrogen removal percentage Total Nitrogen Removal Percentage COD percentage 20d 40.01％ 7.13％ 27.22％ 40d 71.25％ 22.38％ 44....

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Abstract

The invention relates to a method for simultaneous nitrification and denitrification treatment of a micro-polluted eutrophic water body with a low C / N ratio. The method comprises the following steps of (1) a first stage, separately filling a bioreactor with a plastic suspended filler, making a to-be-treated eutrophic water body flow through the filled bioreactor and forming a film on the bioreactor for maturation; and (2) a second stage, after forming the film on the bioreactor in the step (1) for maturation, adding a pretreated biodegradable carrier shaddock peel, removing and stabilizing total nitrogen and organic matters and then stopping running. Heterotrophic nitrification bacteria, solid-phase heterotrophic denitrification bacteria, non-solid-phase heterotrophic denitrification bacteria and sulfur-based autotrophic denitrification bacteria appear in a biofilm system at the same time through adding the biodegradable carrier shaddock peel at the second stage and promoting extensive enrichment of functional microorganisms Thiothrix, Gemmata, unclassified comanonadaceae, unclassified Rhizobiales, Salipiger and Chloronema; efficient simultaneous nitrification and denitrification processes are achieved through collaborative metabolism; and the nitrogen removal efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of eutrophic water body treatment, and in particular relates to a method for synchronous nitrification and denitrification treatment of low C / N ratio slightly polluted eutrophic water body. Background technique [0002] As a low-cost and high-efficiency sewage treatment method, biofilm method has been widely used in the treatment of micro-polluted eutrophic water bodies. The widely recognized metabolic pathways for nitrogen removal in biofilm reactors mainly include two kinds of nitrification and denitrification. In the traditional sense, nitrification is mainly accomplished by autotrophic bacteria in an aerobic environment, while denitrification is mainly achieved by heterotrophic bacteria relying on electron donors in anoxic or anaerobic environments. Previous studies have shown that efficient nitrification is easy to achieve but also easily leads to the accumulation of nitrate and nitrite in biofilm reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F3/34
CPCC02F3/302C02F3/34
Inventor 赵静冯丽娟阳广凤穆军
Owner ZHEJIANG OCEAN UNIV