Method for treating canned citrus petal pectin wastewater

Abstract

The invention discloses a method for treating canned citrus petal pectin wastewater. By employing the method for combining mechanical bar screen and coagulating sedimentation, aerated air floatation and microbial advanced treatment, a mature strain of fungus penicillium simplicissimum is added into a microbial reaction pool in the microbial advanced treatment process, the pectin in the wastewater is degraded into low molecular weight organic matter galacturonic acid and methyl galacturonase under the catalytic action of pectinase generated by the mature strain of penicillium simplicissimum, and the highest degradation efficiency of the penicillium simplicissimum on the pectin is 97.4 percent; meanwhile, the penicillium simplicissimum has a good effect on the degradation of the CODCr in the wastewater, and the highest degradation efficiency on the CODCr is 89.9 percent; moreover, according to the process flow, the wastewater is extremely low in organic content and viscosity, the GB8978-1996 secondary emission standard of the integrated wastewater discharge standard is achieved, and emission on standard is realized. The process has the advantages that the energy consumption is low, the process is easy to operate, secondary pollution is not caused, and the like.

Description

technical field [0001] The invention relates to a method for treating canned citrus pectin wastewater, in particular to treating the canned citrus pectin wastewater by adopting mechanical filtration, coagulation sedimentation, air flotation and microbial advanced treatment. Background technique [0002] Citrus canned production wastewater has a large amount of discharge and complex components. The wastewater contains a large amount of acid, peel, pulp, sugar, pectin, etc., COD Cr High concentration of other pollutants, some wastewater COD Cr Concentration up to 10000 mg / L, average 3500 mg / L; BOD up to 2000 mg / L, average 1500 mg / L; wastewater quality BOD / COD Cr >0.3-0.5, the wastewater has good biodegradability; the pH is basically acidic; especially the wastewater contains 500-3000 mg / L of pectin. The alias of pectin is soluble pectin, and its components are polygalacturonic acid methyl ester and galacturonic acid. The relative molecular mass is 50,000-150,000, and the ...

AI Technical Summary

Problems solved by technology

[0003] There are many ways to treat pectin in common citrus canned pectin wastewater. The traditional method is the direct decomposition method of pectinase. The nature of the waste water has high requirements; the method of ethanol precipitation of pectin requires a large amount of alcohol, and the price of alcohol is rising year by year, which makes the production cost high. At the same time, the extraction rate of pectin is not high, and the purity of pectin extracted is not high. A large amount of waste water will be produced in the process

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