Coupling filler autotrophic denitrification biofilter and application

A technology of autotrophic denitrification and biological filter, which is applied in special compound water treatment, biological water/sewage treatment, anaerobic digestion treatment, etc. Efficiency improvement, increasing denitrification rate, and solving the effect of nitrification rate

Active Publication Date: 2018-12-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the prior art filler design, the idea is to make the sulfur sources play their respective electron-donating roles, and achieve the purpose of denitrification by the simple summation of the electron-donating roles of each substance, which leads to the problem that it is difficult to greatly increase the nitrification rate of sulfur autotrophic denitrifying bacteria , the present invention provides a filler component capable of promoting electron donors to provide electrons, using the positive chain reaction formed between the negative valence sulfur ions dissolved from pyrrhotite and sulfur to improve the efficiency of the two electron donors. Provide the rate of electrons, and generate polysulfides that are easily utilized by microorganisms, thereby accelerating denitrification, and accelerating the release of iron ions in pyrrhotite to increase the rate of phosphorus removal, achieving the purpose of coupling growth, that is, using pyrrhotite Ore, sulfur, calcium carbonate / magnesium carbonate minerals are mixed in a certain proportion and coupled with an autotrophic denitrification biofilter, a sewage treatment technology for rapid removal of nitrogen and phosphorus in water

Method used

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  • Coupling filler autotrophic denitrification biofilter and application
  • Coupling filler autotrophic denitrification biofilter and application
  • Coupling filler autotrophic denitrification biofilter and application

Examples

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preparation example Construction

[0046] The implementation steps of the preparation method and application of autotrophic denitrification biofilm filler in the following examples are:

[0047] Step (1), preparation and filling of filler: uniformly mix and couple pyrrhotite, sulfur, calcium carbonate / magnesium carbonate minerals according to a certain volume ratio, and then fill them into the reactor;

[0048] Step (2), inoculation of film formation: inoculate the reactor in step (1) with activated sludge or sulfur autotrophic denitrification bacteria, add nutrient solution and cultivate for several days until the completion of microbial film formation;

[0049] Step (3), operation: feed sewage to be treated into the reactor, flow through the reactor in an upflow manner, collect the overflow and discharge it through the outlet pipe, that is, the treatment of sewage nitrogen and phosphorus is completed.

Embodiment 1

[0051] In this example, pyrrhotite, sulfur, and limestone were evenly mixed according to the volume ratio of 8:3:1 to prepare a filler with a total volume of 13L. The average particle sizes of the three minerals were 3mm, 2mm, and 2.7mm, respectively. Fill the filler into the reactor, inoculate the anaerobic sludge and add the culture solution, and complete the film formation after 8 days of cultivation. Feed water into the reactor, the hydraulic retention time is 2h, and the nitrogen and phosphorus in the water in and out during the 99d operation process are as follows: figure 1 shown.

Embodiment 2

[0053] In this example, pyrrhotite, sulfur, and calcite were uniformly mixed at a volume ratio of 2:2:1 to prepare a filler with a total volume of 2L. The average particle sizes of the three minerals were 5mm, 3.5mm, and 3.3mm, respectively. Fill the filler into the reactor, inoculate the anaerobic sludge and add the culture solution, and complete the film formation after 5 days of cultivation. Feed water into the reactor, the hydraulic retention time is 1.6h, and the nitrogen and phosphorus in the water in and out during the 120d operation are as follows: figure 2 shown.

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Abstract

The invention discloses a coupling filler autotrophic denitrification biofilter and application and belongs to the technical field of sewage treatment. Pyrrhotite, sulfur and a carbon source are utilized to be mixed and coupled according to certain proportion; then the materials are put into a reactor, and the autotrophic denitrification biofilter can be formed after inoculating biofilm formation;sewage flows through the biofilter, and nitrogen and phosphorus in the water are removed. The biofilter disclosed by the invention has the advantages of simpleness, easiness, practicability and shortbiofilm formation time; when the biofilter is utilized to treat nitrogen and phosphorus containing sewage, hydraulic retention time is only 0.5 to 3 h, and yielding water can meet a requirement; furthermore, the biofilter has the advantages of excellent nitrogen and phosphorus removal effect, low cost and suitability for engineering application.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a coupling packing self-supporting denitrification biological filter and its application. Background technique [0002] In recent years, environmental protection has become the focus of society, and the state has invested a lot of money in the research, development and application of environmental protection technologies. Among them, the upgrading and transformation of sewage treatment is in full swing, and various technologies are also emerging. However, some of these technologies have relatively high costs, and some have limited effects, and many technologies need to consume a large amount of energy when they are applied. Therefore, technologies with low energy consumption, low cost and high efficiency are expected by the market. [0003] The advanced treatment of nitrogen and phosphorus is the top priority of sewage treatment upgrading. Biological m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
CPCC02F3/2806C02F2305/06
Inventor 李睿华王卫葛志斌关梦莎罗黎煜李甫昌张永威
Owner NANJING UNIV
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