Method for treating low-salt preserved Szechuan pickle processing wastewater by cultivating Spirulina

A technology of spirulina and mustard, applied in the field of processing low-salt wastewater from mustard processing, can solve the problems of increased pressure on environmental protection, pollution of farmland, river salt water, eutrophication of river water, etc., and achieve resource reuse and operation. low cost effect

Active Publication Date: 2017-01-11
YANGTZE NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current low-salt wastewater from mustard processing is usually directly discharged as wastewater, which not only causes eutr

Method used

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  • Method for treating low-salt preserved Szechuan pickle processing wastewater by cultivating Spirulina
  • Method for treating low-salt preserved Szechuan pickle processing wastewater by cultivating Spirulina

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Precipitate the low-salt waste water from mustard processing for 12 hours, remove the precipitated sediment, and obtain a clarified liquid, boil the clarified liquid for 10 minutes, cool to normal temperature, and adjust the pH value to 11.5 with potassium hydroxide; mix potassium dihydrogen phosphate with sulfuric acid Magnesium is mixed in a mass ratio of 1:1 to obtain an ammonia-reducing mixture, which is added to the low-salt waste water of mustard mustard processing of the aforementioned gained, and the mass ratio of the ammonia-reducing mixture to the low-salt waste water of mustard mustard processing of the aforementioned gained is 6:100, stirring Evenly, filter with a layer of gauze after standing for 60 minutes, filter out the precipitated matter, and obtain the filtrate; add sodium bicarbonate in the filtrate, and the mass ratio of sodium bicarbonate and the filtrate is 0.45:100 to obtain pretreated Mustard processing low-salt wastewater solution; according to ...

Embodiment 2

[0030] Precipitate the low-salt waste water of mustard mustard processing for 6 hours, remove the precipitated sediment, and obtain a clear liquid, boil the clear liquid for 5 minutes, cool to normal temperature, and adjust the pH value to 9 with potassium hydroxide; mix potassium dihydrogen phosphate with sulfuric acid Magnesium is mixed in a mass ratio of 1:1.2 to obtain an ammonia-reducing mixture, which is added to the low-salt waste water of mustard mustard processing of the aforementioned gained, and the mass ratio of the ammonia-reducing mixture to the low-salt waste water of mustard mustard processing of the aforementioned gained is 1:100, stirring Evenly, filter with two layers of gauze after standing for 20 minutes, filter the precipitated matter, and obtain the filtrate; add sodium bicarbonate in the filtrate, the mass ratio of sodium bicarbonate and the filtrate is 0.3:100, and obtain the pretreated Mustard mustard processing low-salt wastewater solution; according ...

Embodiment 3

[0032] Precipitate the low-salt waste water of mustard mustard processing for 8 hours, remove the precipitated sediment, and obtain a clear liquid, boil the clear liquid for 7 minutes, cool to normal temperature, and adjust the pH value to 10 with potassium hydroxide; mix potassium dihydrogen phosphate with sulfuric acid Magnesium is mixed in a mass ratio of 1:1.1 to obtain an ammonia-reducing mixture, which is added to the low-salt waste water of mustard mustard processing of the aforementioned gained, and the mass ratio of the ammonia-reducing mixture to the low-salt waste water of mustard mustard processing of the aforementioned gained is 3:100, stirring Evenly, filter with three layers of gauze after standing for 30 minutes, filter out the precipitated matter, and obtain the filtrate; add sodium bicarbonate in the filtrate, and the mass ratio of sodium bicarbonate and the filtrate is 0.6:100 to obtain pretreated Mustard processing low-salt wastewater solution; according to ...

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Abstract

The invention relates to a method for treating low-salt preserved Szechuan pickle processing wastewater. The method includes naturally precipitating the low-salt preserved Szechuan pickle processing wastewater for 6-12 hours, taking clarified liquor, boiling for 5-10 minutes and regulating a pH value to be 9-11.5 after cooling; mixing monopotassium phosphate with magnesium sulfate in a mass ratio of 1:1-1.2 to obtain an ammonia-reducing mixture, adding the mixture into the low-salt preserved Szechuan pickle processing wastewater obtained in previous step with stirring evenly, standing for 20-60 minutes and filtering to obtain filtrate; adding sodium bicarbonate into the filtrate to obtain a pretreated low-salt preserved Szechuan pickle processing wastewater solution, inoculating Spirulina platensis or Spirulina maxima into the pretreated low-salt preserved Szechuan pickle processing wastewater solution according to a conventional Spirulina cultivation method in the prior art and cultivating to enable the low-salt preserved Szechuan pickle processing wastewater quantity to reach the discharge standard after 15 days, wherein the Spirulina concentration OD560 ranges from 0.6-1.5 and the Spirulina inoculum size is 2.5-10 ml/L. The method is capable of treating the low-salt preserved Szechuan pickle processing wastewater at a low cost and enables the low-salt preserved Szechuan pickle processing wastewater to reach or approximate to the urban sewage discharge standards basically.

Description

technical field [0001] The invention relates to a food processing wastewater treatment technology, in particular to a treatment method for mustard processing low-salt wastewater. Background technique [0002] Mustard processing wastewater includes pickling brine, elutriation brine, dehydration brine, desalination brine, etc. At present, only Fuling District of Chongqing City discharges over 3.5 million tons of mustard processing wastewater every year. Dehydrated brine, secondary and tertiary pickling brine belong to high-salt wastewater, which has the characteristics of high salt and high organic matter, with a salt content of 15-30% and a COD of 5000-7500mg / L. For mustard mustard processing high-salt wastewater, there are many treatment technologies at present, generally using physical chemical or biological nitrogen and phosphorus removal and COD technology, but there are problems of high equipment investment, high energy consumption, and no economic benefits, so there are...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/32
CPCC02F1/001C02F1/02C02F1/5236C02F1/66C02F9/00C02F2001/007C02F2103/32
Inventor 李昌满许明惠许秀蓉曾健
Owner YANGTZE NORMAL UNIVERSITY
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