Method for removing nitrate nitrogen in water by using blended material including PHBV (Polyhydroxylbutyrate Valerate) and bamboo powder

A technology for nitrogen nitrate and water removal, applied in the field of water treatment, can solve the problems of difficult carbon source dosage, difficult control of carbon-nitrogen ratio, inconvenient transportation, etc. Effect

Active Publication Date: 2013-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methanol is currently the most widely used and researched liquid carbon source. It has good denitrification effect and low sludge yield; the disadvantages are toxicity, inconvenient transportation and high price
The common problem with the use of dissolved carbon sources is that it is difficult to control the ratio of carbon to nitrogen, especially when the influent nitrate fluctuates, it is more difficult to control the dosage of carbon sources
Compared with cheap natural solid organic matter, biodegradable polymer denitrification process has better water quality, lower chroma and TOC, stable operation, and easy control, but its high price limits its application in the field of water treatment

Method used

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  • Method for removing nitrate nitrogen in water by using blended material including PHBV (Polyhydroxylbutyrate Valerate) and bamboo powder
  • Method for removing nitrate nitrogen in water by using blended material including PHBV (Polyhydroxylbutyrate Valerate) and bamboo powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) The mass ratio of PHBV to bamboo powder in the blend material is 1:1, and the filling rate of the carrier is 35%;

[0023] (1) The material of the fixed bed reactor is plexiglass, cylindrical, with an effective volume of 0.55 L, and an external water bath jacket is used to maintain the temperature of the reactor at 22 o C ~24 o C; as attached figure 1 As shown, the water enters the bottom and the water exits the upper part; the groundwater is taken from the Changping Campus of Tsinghua University in Beijing; the property indicators of the groundwater are shown in Table 1;

[0024] (3) The reactor was inoculated without adding any sludge, and was started directly by adding groundwater, and the initial hydraulic retention time was set to 17 h; although the microorganisms in the groundwater were relatively poor, due to the good biodegradability of PHBV and bamboo powder, the reactor was started After 5 days, the concentration of nitrate nitrogen in the effluent can b...

Embodiment 2

[0027] (1) The mass of PHBV and bamboo powder in the blend material is 1:1, and the filling rate of the carrier is 45%;

[0028] (2) The material of the fixed bed reactor is plexiglass, cylindrical, with an effective volume of 0.55 L, and an external water bath jacket is used to maintain the temperature of the reactor at 22 o C ~24 o C; as attached figure 1 As shown, the water enters the bottom and the water exits the upper part; the groundwater is taken from the Changping Campus of Tsinghua University in Beijing; the property indicators of the groundwater are shown in Table 1;

[0029] (3) The reactor does not add seed mud, but directly adds groundwater to start, and the initial residence time is set to 17 h; after 5 days after the reactor is started, the concentration of nitrate nitrogen in the effluent can be reduced to below 2.0 mg / L, and the nitrogen removal rate can be reach more than 85%;

[0030] (4) Gradually reduce the HRT. The specific plan is: maintain 2 days at...

Embodiment 3

[0032] (1) The mass ratio of PHBV to bamboo powder in the blend material is 3:1, and the filling rate of the carrier is 35%;

[0033] (2) The material of the fixed bed reactor is plexiglass, cylindrical, with an effective volume of 0.55 L, and an external water bath jacket is used to maintain the temperature of the reactor at 22 o C ~24 o C; as attached figure 1 As shown, the water enters the bottom and the water exits the upper part; the groundwater is taken from the Changping Campus of Tsinghua University in Beijing; the property indicators of the groundwater are shown in Table 1;

[0034] (3) The reactor does not add any sludge to inoculate, and directly adds groundwater to start, and the initial residence time is set to 17 h; after 8 days after the reactor is started, the concentration of nitrate nitrogen in the effluent can be reduced to below 2.0 mg / L, and the removal rate of nitrogen Above 85%.

[0035](3) Gradually reduce the HRT. The specific plan is: maintain 3 da...

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Abstract

The invention belongs to the technical field of water treatment methods and particularly relates to a method for removing nitrate nitrogen in water by using a blended material including PHBV (Polyhydroxylbutyrate Valerate) and bamboo powder. The method comprises the following steps of: adding blended particles, including the PHBV and the bamboo powder, with the particle size being 0.3-0.5cm into a fixed-bed reactor, wherein the filling rate is 30-60%; and adding underground water into the reactor directly without adding any seed sludge, and starting the reactor, wherein the initial hydraulic retention time (HRT) is 17h, and HRT is gradually reduced after the nitrate nitrogen concentration of effluent reaches 2-5mg/L. According to the invention, the blended material including the PHBV and the bamboo powder is taken as both a carrier of a biological membrane and a carbon source for denitrification, and has the advantages of obviously improving the biodegradability of materials, shortening the starting time of the reactor and reducing the denitrification cost; the underground water instead of sludge of a sewage treatment plant is added into the solid carbon-source reactor directly for acclimation starting, so that pathogenic bacteria in the sludge of the sewage treatment plant can be prevented from being introduced, thus the method is particularly suitable for the denitrification treatment of underground water and drinking water; and the reactor is simple in operation and running, easy to control and good in effluent quality.

Description

technical field [0001] The invention belongs to the technical field of water treatment methods, in particular to a method for removing nitrate nitrogen in water by using PHBV and bamboo powder blended materials. Background technique [0002] In recent years, due to the discharge of a large amount of nitrogen-containing domestic and industrial sewage into water bodies, as well as the excessive use of chemical fertilizers and pesticides, nitrate nitrogen pollution in surface water and groundwater has become a prominent problem of water pollution worldwide. Heterotrophic denitrification is currently the most widely used method for biological removal of nitrate nitrogen (J. Van Rijn, Y. Tal, H. J. Schreier, Denitrification in recirculating systems: Theory and applications, Aquacultural Engineering 34(3) (2006) 364- 376). In order to ensure the smooth progress of denitrification reaction, sufficient carbon source must be provided. In addition, with the improvement of sewage tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
Inventor 王建龙初里冰
Owner TSINGHUA UNIV
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