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Method for recycling nitrogen and phosphorus in sewage

A resource and sewage technology, applied in the field of nitrogen and phosphorus resource utilization in sewage, to achieve a virtuous cycle, improve absorption efficiency, and promote environmental protection.

Inactive Publication Date: 2015-06-24
青岛市畜牧兽医研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these nutrients exist in the form of organic macromolecules, which need to be slowly degraded by environmental microorganisms before they can be absorbed and utilized by aquatic plants.

Method used

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  • Method for recycling nitrogen and phosphorus in sewage
  • Method for recycling nitrogen and phosphorus in sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 A method for rapidly utilizing nitrogen and phosphorus in sewage by anaerobic fermentation and duckweed cultivation

[0025] Sewage treatment process such as figure 1 , figure 2 shown. First, build a sedimentation well with a volume of 100 cubic meters and a brick-concrete structure. The sewage enters the No. 1 sedimentation well through the underground sewage pipe network. After 48 hours of sedimentation, the solid part of the lower layer is used as organic fertilizer, and the liquid part of the upper layer is added to the mass volume The ratio is 2% NaOH, add hydrochloric acid after standing for 36 hours to adjust the pH to 7.2, and enter the sewage anaerobic fermentation tank treatment system (UASB anaerobic reactor, 8 meters high, 3 meters in diameter, effective volume 56 cubic meters, disposable Treat 5 tons of sewage, purchased from Qingdao Yiweiyou Environmental Engineering Equipment Co., Ltd.), take anaerobic activated sludge as the inoculum, and...

Embodiment 2

[0026] Example 2 Duckweed Determination of Absorption Efficiency of Nitrogen and Phosphorus in Biogas Slurry

[0027] The biogas slurry obtained after treatment by the sewage anaerobic fermentation tank treatment system in Example 1 was used for the test of this example. A square plastic pot (length 20cm, width 15cm, height 10cm) was used as the test container, and 1000mL of biogas slurry was added, and then 2g fresh weight of the pre-cultivated Zihuaia spp. was added to each treatment for 15 days. There were 20 repetitions for each duckweed treatment, and 5 repetitions were set for the water sample without duckweed as the control. All treatments were cultured and observed in a laboratory with uniform natural light. The temperature in the laboratory was maintained at 25-30°C. During the test, 3 repetitions were randomly selected for the two duckweed treatments every 3 days, and 3 repetitions were taken for the control group, and the remaining repetitions were replaced with 1...

Embodiment 3

[0030] The mensuration of starch and protein content in the duckweed of embodiment 3 biogas slurry cultivation

[0031] The starch content was determined indirectly by the total sugar content method (starch content=total sugar content×0.909). The dried duckweed powder obtained in Example 1 was hydrolyzed by 1.2M hydrochloric acid in a boiling water bath. The pH was adjusted to 7.0 using 10M NaOH, and lead acetate was added to precipitate the protein. Use C18 solid-phase extraction column to filter supernatant, use HPLC (Thermo 2795, Thermo Corp., USA) to analyze hydrolysis reaction, detector uses evaporative light scattering detector (All-Tech ELSD 2000, All-tech., Corp., USA). For the detailed process, please refer to the literature Zhang, L., Zhao, H., Gan, M., Jin, Y., Gao, X., Chen, Q., Guan, J., Wang, Z., 2011.Application of simultaneous saccharification and fermentation (SSF) from viscosity reducing of raw sweet potato for bioethanol production at laboratory, pilot an...

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Abstract

The invention discloses a method for recycling nitrogen and phosphorus in sewage. The method comprises the following steps: 1) draining sewage into a settling basin through an underground sewage drain pipeline net, separating out a solid part and a fluid part through solid-liquid separation and submerged pump equipment; and 2) enabling the fluid part obtained in the step 1) to flow into a sewage anaerobic fermentation processing system, thereby obtaining biogas fluid, wherein the obtained biogas fluid can be used for duckweed aquaculture in indoor algae ponds; collecting duckweed, drying and crushing the collected duckweed to obtain duckweed dry powder, wherein the obtained duckweed dry powder can be used for producing industrial alcohol. According to the method provided by the invention, through anaerobic fermentation and duckweed aquaculture, nitrogen and phosphorus, which are harmful to the environment, in sewage are fast converted into useful resources to the maximum extent, the obtained economic benefit are beneficial to further promotion of the work of environment protection and realize virtuous cycle.

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource utilization, in particular to a method for resource utilization of nitrogen and phosphorus in sewage. Background technique [0002] With the increasing energy demand, environmental pressure and food security issues, more and more researchers have begun to focus on the development and research of new alternative clean bio-energy and new feed materials. Following the bio-energy development strategy of "not competing with others for food and land", the corn fuel ethanol plan in the United States and the sugarcane ethanol plan in Brazil are not suitable for the reality of the Chinese people who have a lot of land and little land. Find and develop new energy sources Biological and feed sources have great strategic significance and application value. [0003] At present, my country imports more than 70% of protein feed raw materials. It imports about 40 million tons of soy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/38C02F101/30
Inventor 赵金山王建华李和刚王中华周功克江科马玉彬
Owner 青岛市畜牧兽医研究所