Slow-release electron donor and method for advanced nitrogen removal of wastewater by applying slow-release electron donor

An electron donor, slow-release technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high effluent hardness, consumption of limestone, etc. The effect of small mud yield and easy engineering popularization and application

Active Publication Date: 2017-08-04
北京中持碧泽环境技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfur limestone denitrification system consumes a large amount of limestone, resulting in higher effluent hardness

Method used

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  • Slow-release electron donor and method for advanced nitrogen removal of wastewater by applying slow-release electron donor
  • Slow-release electron donor and method for advanced nitrogen removal of wastewater by applying slow-release electron donor
  • Slow-release electron donor and method for advanced nitrogen removal of wastewater by applying slow-release electron donor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a slow-release electron donor and a method for deep denitrification of sewage by using it. The slow-release electron donor is a complex composed of siderite and sulfur at a volume ratio of 1:1. First, the surface of natural siderite is cleaned with 0.5% dilute hydrochloric acid, ground and crushed into particles with a diameter of 2mm to 5mm, and the surface of sulfur is also cleaned with 0.5% dilute hydrochloric acid, ground and crushed into particles with a diameter of 2mm to 5mm, and then Siderite granules and sulfur granules are uniformly mixed at a volume ratio of 1:1 before use.

[0043]Fill the microporous hollow sphere carrier with the above-mentioned slow-release electron donor to form a biofilter filler. The diameter of the microporous hollow sphere is 20mm, the mesh is 180 mesh, and the material is high-density polyethylene. The filling of the slow-release electron donor It is 90% proportioned and comes in a snap-seal package after f...

Embodiment 2

[0050] Embodiments 2 to 3 respectively provide a slow-release electron donor and a method for deep denitrification of sewage by using the same. Their operations are basically the same as those in Example 1, except that the specifications of sulfur and siderite in the slow-release electron donor are different. Wherein, the siderite and sulfur in embodiment 2 are all particles with a diameter of 0.5 mm to 2 mm, and the siderite and sulfur in embodiment 3 are all particles with a diameter of 0.1 mm to 0.5 mm. Embodiments 2 and 3 The processing result and the comparison with embodiment 1 processing result are as shown in table 1. It can be seen from Table 1 that the smaller the particles of siderite and sulfur, the better the denitrification effect and the higher the pH stability.

[0051] The denitrification effect in the embodiment 2~3 of table 1

[0052]

Embodiment 4

[0054] Embodiments 4 to 8 are also respectively a slow-release electron donor and a method for deep denitrification of sewage by using it. Their operations are basically the same as in Example 1, except that the compounding ratio of sulfur and siderite in the slow-release electron donor is different. Wherein, the slow-release electron donor in Example 4 is a compound composed of siderite and sulfur in a volume ratio of 1:2, and the slow-release electron donor in Example 5 is made of siderite and sulfur in a volume ratio 2:1 composition compound, the slow-release electron donor in embodiment 6 is the complex that is made up of siderite and sulfur by volume ratio 1:10, and the slow-release electron donor in embodiment 7 is made of siderite The complex composed of ore and sulfur at a volume ratio of 1:5, the slow-release electron donor in Example 8 is a complex composed of siderite and sulfur at a volume ratio of 5:1. The processing results of Examples 4-8 and the comparison wit...

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Abstract

The invention discloses a slow-release electron donor and a method for advanced nitrogen removal of wastewater by applying the slow-release electron donor. The slow-release electron donor disclosed is prepared from a compound which consists of siderite and sulfur at a volume ratio of (1 to 10) to (5 to 1). The slow-release electron donor disclosed by the invention has the advantages of wide resource and low price. The method for the advanced nitrogen removal of the wastewater, provided by the invention, has advantages of stable performance, low sludge yield and wide application prospect.

Description

technical field [0001] The invention belongs to the field of deep purification treatment of sewage (waste) water, and in particular relates to a slow-release electron donor and a method for deep denitrification of sewage by using the same. Background technique [0002] Sewage recycling is an effective way to solve the water crisis. At present, urban domestic sewage still contains a certain concentration of nitrogen-containing pollutants after secondary treatment. If there is no deep denitrification treatment, only relying on the self-purification ability of the environment to absorb the nitrogen in the water body will cause a large pollution load and ecological toxicity to the environment. Therefore, the development of a new method for deep denitrification with high efficiency and economy has become a research hotspot in the field of sewage resource utilization. [0003] Traditional denitrification technology needs to consume a large amount of organic matter, but the carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F3/34
CPCC02F3/2806C02F3/34C02F3/346C02F2003/001C02F2305/06
Inventor 王爱杰朱婷婷程浩毅王鸿程王树森
Owner 北京中持碧泽环境技术有限责任公司
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