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Carrier for waste water biological treatment and its preparation

A biological treatment and carrier technology, applied in the direction of sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of lower treatment efficiency, gas production and floating, and large mass transfer resistance, etc., to achieve The effect of large adsorption biomass, improved degradation efficiency, and easy fluidization

Inactive Publication Date: 2005-05-11
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the imperfect crystallization inside the polyvinyl alcohol hydrogel particles produced by the freezing method, a large amount of foam was generated in the aeration tank of wastewater treatment during the test, which not only increased the COD value of the treated water, but also caused the hydrogel The service life will be greatly reduced
In addition, although the hydrogel containing calcium chloride has less dissolution of polyvinyl alcohol, during use, calcium ions will inevitably liberate with some anions in the wastewater to form precipitates, thereby reducing the treatment efficiency
[0003] Therefore, the microbial carriers currently used mainly have the following problems: the embedding particles are easily broken, the mass transfer resistance is large, the gas production floats up, and the activity is lost. The low microbial activity, the slow reaction between PVA and boric acid, and the difficulty in forming PVA gel into balls; the crystallization inside the polyvinyl alcohol hydrogel particles produced by freezing method is not perfect, which leads to the aeration of wastewater treatment during the test. A large amount of foam is generated in the pool, which not only increases the COD value of the treated water, but also greatly reduces the service life of the hydrogel. In addition, although the hydrogel containing calcium chloride has less dissolution of polyvinyl alcohol, it is in During use, calcium ions will inevitably form precipitates with some anions in the wastewater, thereby reducing the treatment efficiency; at present, the use of PVA gel to immobilize microorganisms generally adopts the embedding method: the PVA is dissolved in water after heating, and in its After adding additives to the aqueous solution, gelation occurs, or it is frozen at low temperature (-10°C) to form a gel, thereby embedding and fixing microorganisms in the gel network, but the current large-scale industrial preparation technology of immobilized cells is not enough Large-scale application in engineering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First prepare PVA hydrogel solution, the composition of PVA hydrogel solution: PVA 8%, sodium alginate 1%, reduced iron powder 2%, CaCO 3 0.3%, SiO 2 powder 4%; formaldehyde cross-linking solution: formaldehyde 25g / L, NaSO4 150g / L, sulfuric acid 200g / L

[0016] Production method: first weigh the quantitative PVA solid according to the above ratio, wash it with tap water for 2 to 3 times, add water to soak overnight, and make an 8% PVA solution; then heat in a water bath, keep the temperature above 95°C, and keep stirring until the PVA is completely Dissolve, if any water loss is found during the heating process, add water immediately; then carefully pour in the pre-prepared sodium alginate, reduced iron powder, CaCO 3 and SiO 2 Powder, stir while pouring to prevent the powder from agglomerating into spherical undissolved matter. Continue to stir until the added ingredients are mixed evenly in the hydrogel; then prepare a shaping mold, depending on the particle size ...

Embodiment 2

[0018] Composition of PVA hydrogel solution: PVA solution: PVA 8%, sodium alginate 2%, reduced iron powder 2%, CaCO3 0.3%, SiO2 powder 4%; formaldehyde cross-linking liquid: formaldehyde 25g / L, NaSO4 150g / L , sulfuric acid 200g / L

[0019] Production method: Weigh the quantitative PVA solid according to the above ratio, wash it with tap water for 2 to 3 times, soak overnight, and make an 8% PVA solution; heat in a water bath, keep the temperature above 95°C, keep stirring until the PVA is completely dissolved, and heat If any water loss is found during the process, add water immediately, and then carefully pour in the pre-prepared sodium alginate, reduced iron powder, and CaCO 3 and SiO 2 powder, stir while pouring, to prevent the powder from agglomerating into spherical undissolved matter, continue to stir until the added ingredients are mixed evenly in the hydrogel; prepare a shaping mold, according to the particle size of the carrier to be prepared, to prepare the particle ...

Embodiment 3

[0021] In an aerobic internal circulating fluidized bed reactor with an effective volume of 15L, the carrier and microorganisms are mixed and cultivated together. The substrate is the effluent after anaerobic biological treatment with glucose and water, COD1500-2000mg / L, water inflow 30L / d, the reaction The organic load of the machine is 3-6gCOD / d·L, the effluent COD after wastewater treatment is 100-150mg / L, and the COD removal rate can reach 90-95%. The carrier can form a microbial film within 3-5 days. According to the scanning electron microscope observation, the immobilized microbial flora of the carrier is rich, and the adsorbed biomass of the carrier can reach 0.204g / cm 3 .

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Abstract

A carrier for treating waste water and its production are disclosed. It is produced by: mixing PVA and batching, freezing initial forming, formaldehyde cross-linking liquid pre-cross-linking, drying, breaking, screening, cross-linking, washing and drying. Its advantages include easy formation, good microbial fixing performance and simple process.

Description

1. Technical field: [0001] The invention relates to a biological carrier, in particular to a microorganism immobilized carrier applied to waste water biological treatment. 2. Background technology: [0002] The key to treating organic wastewater with immobilized microorganisms is to choose a suitable microbial carrier. PVA is a polymer embedding material first developed by Japanese scholars. It has been valued due to its characteristics of non-toxicity, anti-microbial decomposition, high mechanical strength and low price. The results of the study showed that the survival rate of bacteria and the efficiency of treating wastewater were satisfactory. However, it has defects such as easy broken embedded particles, high mass transfer resistance, gas production and floating up, and loss of activity. The polyvinyl alcohol hydrogel used in most researches is prepared by freezing method (or adding calcium chloride during freezing). The formation mechanism of f...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F3/10
CPCY02W10/10
Inventor 黄钧杨航李毅军张云昭
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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