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Method for removing nitrate in underground water by using hydrogen autotrophic denitrification granular sludge

A technology for autotrophic denitrification and nitrification, which is applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. Problems such as nitrite accumulation

Active Publication Date: 2020-07-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing hydroautotrophic denitrification process is based on hydroautotrophic denitrification flocculent sludge and carrier-loaded biofilm process. Due to the low yield coefficient of hydroautotrophic denitrifying bacteria, in comparison, the biofilm process Because the longer sludge age has better treatment effect than the suspended sludge process, however, the biofilm process still has problems such as low operating load and nitrite accumulation in the effluent

Method used

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  • Method for removing nitrate in underground water by using hydrogen autotrophic denitrification granular sludge
  • Method for removing nitrate in underground water by using hydrogen autotrophic denitrification granular sludge
  • Method for removing nitrate in underground water by using hydrogen autotrophic denitrification granular sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1, cultivating hydrogen autotrophic denitrification granular sludge

[0063] 1) Domestication and cultivation of hydroautotrophic denitrification flocculent sludge

[0064] Take the activated sludge of ordinary municipal sewage plant as inoculation sludge, the concentration is about 2.3gVSS / L, after inoculation, use H 2 Semi-continuous culture with self-prepared nutrient solution for 60 days. The composition of the culture solution is (contains the following substances per liter): 1.62gKNO 3 ,0.5gNaHCO 3 ,0.55gNaH 2 PO 4 2H 2 O, 2.11g K 2 HPO 4 ·3H 2 O and trace elements 7.3mgCaCl 2 2H 2 O,5.0mgFeSO 4 ·7H 2 O, 2.5 mg MnCl 2 4H 2 O, 0.5 mg CoCl 2 ·6H 2 O, 0.5mg (NH 4 ) 6 Mo 7 o 24 4H 2 O0.22mgZnSO 4 ·7H 2 O and 0.2 mg CuSO 4 ·5H 2O. The method of domestication and culture is sequential batch, and the sequence batch cycle is 12h. The pH of the culture system is 7.0±0.5, and the temperature is 30±1.0°C.

[0065] 2) The hydroautotrophi...

Embodiment 2

[0068] Example 2, using hydrogen autotrophic denitrification granular sludge reactor to treat simulated groundwater

[0069] Utilize the hydroautotrophic denitrification granular sludge cultivated in Example 1 to treat groundwater, maintain the reaction temperature at 30±0.5°C, add an appropriate amount of KNO 3 The simulated groundwater was used as the reactor feed water, and the denitrification effect, stability and effluent NO of the reactor were investigated. 2 - -N levels.

[0070] The sludge used in this test is the hydroautotrophic denitrification granular sludge cultivated in Example 1, and the inoculation sludge concentration in the reactor is 2.44g VSS / L.

[0071] The granular sludge reactor operates continuously for 12 days in accordance with the SBR method, and each SBR cycle is 35 minutes, including water inflow for 3 minutes, reaction for 22 minutes, precipitation for 8 minutes, and drainage for 2 minutes. The test water is to add a certain amount of KNO 3 ta...

Embodiment 3

[0075] Example 3, using hydrogen autotrophic denitrification granular sludge reactor to treat simulated groundwater under low temperature conditions

[0076] Utilize the hydroautotrophic denitrification granular sludge cultivated in Example 1 to treat groundwater, maintain the reaction temperature at 15±0.3°C, add an appropriate amount of KNO 3 The simulated groundwater was used as the reactor feed water, and the denitrification effect, stability and effluent NO of the reactor were investigated. 2 - -N levels.

[0077] The sludge and reactor used in this test are the hydrogen autotrophic denitrification granular sludge and sludge after the end of Example 2.

[0078] The granular sludge reactor operates continuously for 11 days in accordance with the SBR method, in which the cycle is 85 min for 7 days and the cycle is 75 min for 4 days. When the cycle is 85 minutes, water is fed for 3 minutes, reaction is 72 minutes, precipitation is 8 minutes, and water is drained for 2 min...

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Abstract

The invention discloses a method for removing nitrate in underground water by utilizing hydrogen autotrophic denitrification granular sludge, which comprises the following steps: inoculating the hydrogen autotrophic denitrification granular sludge into a reactor, taking NO3<-> polluted underground water as reactor inlet water, and treating the NO3<-> polluted underground water by using an SBR operation reactor; the operation conditions of the reactor are as follows: the operation temperature is 15.0+ / -0.3 DEG C to 30.0 + / -0.5 DEG C; wherein the operation period of each SBR is 35-87min, the water feeding time is 3min, the reaction time is 22-72min, the precipitation time is 8min, and the water discharging time is 2min; wherein the drainage ratio is 0.56; wherein the HRT is 1.0 to 2.5 hours;wherein the inlet water NO3<->-N load is 0.15 to 0.40 kgN / (m<3>. D); wherein the flow of H2 is 61.6 L / d; wherein a pH value is 7.0 to 8.5. The results show that the hydrogen autotrophic denitrification granular sludge reactor provided by the invention can realize efficient and stable removal of low-concentration NO3<-> in simulated underground water.

Description

technical field [0001] The invention relates to a method for removing nitrate in groundwater by using hydrogen autotrophic denitrification granular sludge. Background technique [0002] Nitrate pollution in groundwater is an important environmental problem worldwide. When groundwater is used as a drinking water source, excessive nitrate can cause diseases such as methemoglobinemia, bladder cancer, and ovarian cancer. Therefore, how to efficiently and stably remove nitrate in groundwater One of the core issues in the field of exploitation. At present, the nitrate removal technologies in groundwater include ion exchange, reverse osmosis, electrocatalytic reduction and other physical and chemical technologies, as well as biological denitrification technologies. Physicochemical technologies usually produce concentrated brine that requires subsequent treatment, and some technologies introduce other pollutants to cause secondary pollution. Biological denitrification technology c...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/282C02F2101/163
Inventor 左剑恶王雅娇王丝可
Owner TSINGHUA UNIV
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