A method of calcium ion regulating biofilm method to treat low c/n ratio wastewater and quickly form a film

A biofilm method and calcium ion technology, which is applied in the field of calcium ion-regulated biofilm method to treat low C/N ratio wastewater with rapid film hanging, can solve the problems of inconvenient operation, difficult control, and need to monitor, and achieves easy operation and practicability. Strong and holistic effect

Active Publication Date: 2020-09-08
NANJING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Chinese invention patent "A method of film-hanging carrier filler in moving bed biofilm reactor" (publication number 05565480A) through the moving bed biofilm reactor simultaneously draining water and supplementing the separated waste water, performing dynamic culture, and refluxing the active sewage Sludge, this method needs to monitor the sludge concentration, which is inconvenient to operate
The Chinese invention patent "A Device and Method for Rapid Biofilm Forming of Wastewater" (publication number 106430560A) speeds up film formation by fixing Sphingomonas rubrum on the filler. Adaptability is affected by many factors and is not easy to control

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  • A method of calcium ion regulating biofilm method to treat low c/n ratio wastewater and quickly form a film
  • A method of calcium ion regulating biofilm method to treat low c/n ratio wastewater and quickly form a film

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This example is about continuous flow moving bed biofilm reactor (MBBR) process BOD 5 Rapid film-forming method of organic fillers in the treatment of high-salinity wastewater with a / TN ratio of 1-2.5.

[0033] Waste water quality: BOD 5The concentration is 200mg / L, the TN concentration is 100mg / L, the salinity is 12g / L, and the soluble polysaccharide concentration in wastewater is 60mg / L. The suspended filler is made of polystyrene, and its pure water contact angle is 99.8 ± 2.23°, showing the characteristics of hydrophobicity. Its shape is a hollow cylinder, with a support structure inside and gears outside. The outer diameter and height of the filler are 25mm and 10mm respectively, and the density is about 0.95g / cm 3 , its effective specific surface area is about 460m 2 / m 3 .

[0034] According to the water quality and filler material conditions, the treatment plan of adding high-concentration calcium ions (800mg / L) supplemented with a certain concentration of...

Embodiment 2

[0043] This example is about the treatment of BOD by the continuous flow biofilm reactor method 5 A rapid film-forming method for organic fillers in the treatment of low-salinity wastewater with a / TN ratio of 2.5-5.

[0044] Waste water quality: BOD 5 The concentration is 500mg / L, the TN concentration is 150mg / L, the salinity is 500mg / L, and the soluble polysaccharide concentration in wastewater is 10mg / L. The suspension filler is made of polypropylene, and its pure water contact angle is 68.5 ± 1.52°, showing the characteristics of hydrophilicity. Its shape is spherical, and it is divided into inner and outer double-layer spheres. The outer part is a hollow fishnet-shaped sphere, and the inner part is a rotating sphere.

[0045] According to the water quality and filler material conditions, the treatment plan of adding low-concentration calcium ions (100mg / L) supplemented with a certain concentration of rhamnolipid (20mg / L) is selected, and at the same time, no calcium ions...

Embodiment 3

[0055] This example is about the biological aerated filter (BAF) treatment of BOD 5 A rapid film-forming method for organic fillers in the treatment of low-salinity wastewater with a / TN ratio of 2.5-5.

[0056] Waste water quality: BOD 5 The concentration is 500mg / L, the TN concentration is 150mg / L, the salinity is 400mg / L, and the soluble polysaccharide concentration in wastewater is 20mg / L. The carrier filler adopts clay ceramic particles.

[0057] According to relevant conditions, select to add low concentration calcium ion (100mg / L) and be supplemented with the processing scheme of rhamnolipid (30mg / L) of certain concentration, simultaneously with not adding calcium ion and adding high concentration calcium ion (800mg / L) L) The treatment regimen served as a control.

[0058] Its fast film-forming method is:

[0059] (1) Put the sludge taken from the aerobic tank of the municipal sewage treatment plant with a concentration of 3g / L into the BAF reactor, discharge all th...

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Abstract

The invention discloses a rapid biofilm formation method for low C / N ratio waste water treatment using a calcium ion-regulated biofilm method, belonging to the field of biofilm-process waste water treatment. The method is characterized by comprising the following steps: (1) measuring biochemical oxygen demand 5 / total nitrogen (BOD5 / TN) of the low C / N ratio waste water; (2) measuring the polysaccharide concentration of dissolved substances in the low C / N ratio waste water and the salinity of the waste water; (3) measuring the contact angle of a filler carrier used by the biofilm method for treating the low C / N ratio waste water; (4) selecting a proper regulation and control scheme according to the related measured values; (5) enabling a biofilm reactor to run, and adding a certain amount of rhamnolipid and calcium chloride into the low C / N ratio waste water every day until biofilm formation is completed. According to the rapid biofilm formation method, calcium ions are complexed with pollutants in the low C / N ratio waste water, so that the attachment and colonization of the dissolved substances and microorganisms in the waste water are accelerated, and the biofilm formation effect is further improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment by biofilm method, and in particular relates to a method for rapid membrane formation of low C / N ratio wastewater treated by calcium ion-regulated biofilm method. Background technique [0002] Low C / N ratio wastewater has the characteristics of wide sources, serious pollution, and poor treatment effect of traditional biological denitrification process, which has become the focus and difficulty of water pollution control. In the low C / N ratio wastewater treatment process, due to insufficient carbon source, the denitrification process of microorganisms is inhibited, resulting in unsatisfactory denitrification and phosphorus removal effects, which affects the treatment effect of the entire process. Therefore, it is necessary to treat this type of wastewater Dosing carbon source. However, adding carbon sources not only increases the treatment cost, but also emits CO 2 Gas pollutes the envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/00C02F3/30C02F3/34C02F101/16
CPCC02F3/005C02F3/30C02F3/34C02F2003/001C02F2101/16C02F2203/006C02F2305/06
Inventor 黄辉彭鹏程任洪强林原胡海冬
Owner NANJING UNIV
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