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Method for strengthening raw water biological pretreatment biological membrane enrichment and operating performance stability

A technology of biological pretreatment and operational performance, applied in sustainable biological treatment, biological water/sewage treatment, chemical instruments and methods, etc., can solve the problems of ineffective removal of organic matter and nitrogen, etc., and is conducive to biomass enrichment. , The effect of large specific surface area and high adsorption performance

Inactive Publication Date: 2015-03-25
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

Although the coagulation process can effectively remove turbidity in raw water, it cannot effectively remove organic matter and nitrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An upflow biofilm reactor with an overflow weir with an effective volume of 15.0 L was used. Inoculate raw water (river water), the average turbidity is 15NTU, the carrier filler is porous polyurethane filler, and the specific surface area is 2395m 2 / m 3 , the porosity is 90%, the solid volume filling rate is 3.47%, and the bulk filling rate is 70%. Start the reactor in the internal circulation continuous water feeding mode. The start-up period is 15 days. The internal circulating water is replaced every 5 days, and the circulating water is replaced 3 times. The total circulating water is 2.7 times the effective volume of the reactor, and the hydraulic retention time is 4h. During the start-up stage of the reactor, 200 grams of diatomite (13.3g / L effective volume of the reactor) was added at a time. The alginate is mixed evenly with the carrier. Ammonium sulfate is added to provide ammonia nitrogen at a concentration of 5mg / LNH 4 + -N, the added easily biodegradab...

Embodiment 2

[0022] A columnar biofilm reactor with an effective volume of 15.0 L was used. Influent composition, carrier filler, start-up method and time, addition of ammonia nitrogen and organic matter levels are the same as in Example 1. Add 50 grams of diatomaceous earth (3.3g / L) at one time during the operation stage of the reactor (day 53). The particle size of diatomite is about 0.1mm. Mechanical stirring is used to mix the diatomaceous earth and the carrier evenly.

[0023] After 16 days of operation, the start-up of the reactor was successfully completed, and the ammonia nitrogen oxidation rate was changed from 0.46 mg / L / d increased to 6.71mg / L / d. During operation, when diatomite is not added, although the effluent ammonia nitrogen can meet the requirements of GB5749-2006 water quality standard under low operating load conditions, but when the influent load is 6.4-18.64mg / L / d, the concentration of ammonia nitrogen in the effluent reaches 0.54-1.79mg / L, which is higher th...

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Abstract

The invention provides a method for strengthening raw water biological pretreatment biological membrane enrichment and operating performance stability. The method comprises the following steps: by inoculating contaminated raw water, starting a raw water biological pretreatment technology under the conditions of an internal cycle feeding operation mode and an additionally adding appropriate amount of nutrient elements, meanwhile adding diatomite as an auxiliary carrier to form biological diatomite, and retaining functional microbes to endow the biological pretreatment technology with high-efficiency and stable operation performance. The method has the advantages that an internal recycle continuous feeding mode is adopted, a relatively stable biological pretreatment technology starting environment is provided, the mixing of low-concentration nutrition media is quickened, and appropriate waterpower shearing force is provided for the formation and stability of a biological membrane; through additionally added nitrogen and organic matters, the multiplication of the functional microbes and the formation of the biological membrane under an oligotrophic condition are quickened; the diatomite can strengthen the formation of a porous structure inside a polyurethane filler, which is beneficial to further enrichment and structuring retaining of biomass, so that the pollutant removal performance and operational stability of the raw water pretreatment technology are strengthened.

Description

Technical field [0001] The present invention involves a method of strengthening the rich and operating performance of raw water biological pre -processing process, which belongs to the field of raw water biological pre -processing technology. Background technique [0002] Due to the advantages of low operating costs and less secondary pollution, biofilm technology has gradually been applied to raw water treatment in recent years, in order to improve the stability of water biological stability, reduce disinfection by -products and nitrite and other harmful substances that threaten human health.However, polluting raw water is a oligopoly nutrient water quality. The concentration of ammonia nitrogen is usually 0.5-5mg / L. The organic carbon content is often only 1 to a few milligrams per liter, which greatly limits the growth of microorganisms and the formation of biofilms.During the start of the general biofilm process, it is often necessary to provide a certain amount of hydraulic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCC02F3/08C02F3/107C02F3/108C02F3/1268C02F2301/02Y02W10/10
Inventor 朱亮阳广凤冯丽娟徐向阳杨玘王莎飞徐剑
Owner ZHEJIANG UNIV
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