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Device and method for recovering nitrogen and phosphorus in sewage and improving biological productivity of microalgae

A technology for microalgae biology and sewage, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. problems, to achieve the effect of saving aeration, reducing energy consumption, and reducing the demand for carbon sources

Inactive Publication Date: 2015-10-28
UNIV OF JINAN
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Problems solved by technology

However, in most cases, these nutrients are not evenly absorbed by the microalgae, thus requiring further treatment
In addition, the energy recovery efficiency is reduced due to the dissolution of methane in the effluent during anaerobic treatment.
Nearly 40% of methane is lost in effluent, contributing to greenhouse effect, study shows

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  • Device and method for recovering nitrogen and phosphorus in sewage and improving biological productivity of microalgae

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Embodiment 1

[0036] Test water: Sewage from septic tanks in residential areas, the specific water quality indicators are as follows: COD is 192-246mg / L; NH 4 + -N is 67-78mg / L, NO 2 - -N≤0.1mg / L, NO 3 - -N below detection line, PO 4 3- -P is 5.1-7.8 mg / L. test system such as figure 1 shown. Among them, the effective volume of the biological phosphorus removal reactor and the biological denitrification reactor is 10L.

[0037] The specific operation method is as follows:

[0038] (1) First, take the activated sludge rich in phosphorus accumulating bacteria and add it to the biological phosphorus removal reactor 2. After adding, the activated sludge concentration is 3500mg / L. At the same time, the short-range nitrification sludge from the urban sewage plant and the granular sludge enriched with anammox bacteria were added to the biological denitrification reactor 6, and the activated sludge concentration in the reactor was 3000 mg / L after the addition.

[0039] (2) The biological ...

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Abstract

The invention discloses a device and a method for recovering nitrogen and phosphorus in sewage and improving biological productivity of microalgae and belongs to the technical field of biological sewage treatment. The device comprises a sewage raw material box, a biological phosphorous removal reactor, a phosphorus containing solution container, an ammonia-nitrogen containing container, a microalgae culture room and a biological nitrogen removal reactor. The invention further provides a method for recovering nitrogen and phosphorus in sewage and improving biological productivity of microalgae by virtue of the device. The method, under the synergistic effect of biological phosphorus removal sludge, short-range nitrification sludge and anammox granular sludge, is used for recovering nitrogen and phosphorus in sewage on a basis that sewage is discharged with the standard level and is used for providing a nutritionally balanced culture medium for microalgae culture, thereby further laying a foundation for biological productivity of microalgae. According to the device and method disclosed by the invention, the concept of conventional sewage biological treatment is changed. The productivity in a sewage treatment process is improved mainly from the perspective of recycling nitrogen and phosphorus resources in sewage, and moreover, the greenhouse effect, caused by methanogenesis productivity depended on anaerobic treatment, of a sewage treatment plant is favorably alleviated.

Description

technical field [0001] The invention relates to a device and method for recovering nitrogen and phosphorus in sewage to increase the biological production capacity of microalgae, belonging to the technical field of sewage biological treatment. Background technique [0002] In the past ten years, with the rapid expansion of urbanization and agriculturalization, nitrogen and phosphorus pollutants from domestic sewage, industrial wastewater and chemical fertilizers have continued to increase. In my country, the environmental and food hazards caused by nutrients such as nitrogen and phosphorus have become very common and very serious. For example, most rivers, lakes, rivers, seas and local groundwater in my country's water bodies are polluted by nitrogen, phosphorus and their compounds to varying degrees, which makes water bodies Eutrophication is increasing. Sewage treatment plants generally achieve the removal of organic carbon, nitrogen and phosphorus in sewage by arranging r...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 石楠马斌
Owner UNIV OF JINAN
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