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Method for recycling ammonia nitrogen, phosphorus and volatile fatty acid in livestock-poultry excrement hydrolysate by two-stage bipolar membrane electrodialysis

A technology of bipolar membrane electrodialysis and livestock and poultry manure, applied in chemical instruments and methods, separation methods, animal husbandry wastewater treatment, etc., can solve the problem of lowering current efficiency, bipolar membrane electrodialysis cannot achieve separation, product purity decline, etc. problems, to achieve the effect of improving recovery efficiency, improving current efficiency and ammonia nitrogen recovery, and increasing recovery

Active Publication Date: 2017-08-18
HUANGSHAN TIANZHIDU ENVIRONMENTAL SCI & TECH DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for ions of the same valence state, although the transfer rates of ions of different masses are different, bipolar membrane electrodialysis still cannot achieve good separation, and the ions in the acid chamber and alkali chamber can diffuse and transfer to each other, reducing the current efficiency. Decrease the purity of the product

Method used

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  • Method for recycling ammonia nitrogen, phosphorus and volatile fatty acid in livestock-poultry excrement hydrolysate by two-stage bipolar membrane electrodialysis
  • Method for recycling ammonia nitrogen, phosphorus and volatile fatty acid in livestock-poultry excrement hydrolysate by two-stage bipolar membrane electrodialysis
  • Method for recycling ammonia nitrogen, phosphorus and volatile fatty acid in livestock-poultry excrement hydrolysate by two-stage bipolar membrane electrodialysis

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1: Two-stage bipolar membrane electrodialysis treatment of artificially synthesized pig manure hydrolyzate.

[0041] The electrodialysis membrane stack used in this example is as figure 1 As shown, the anion and cation exchange membranes and bipolar membranes used are heterogeneous ion exchange membranes produced by Czech MemBrain company, and the effective area of ​​each membrane in the membrane stack is 200cm 2 , there are 5 membrane compartment repeating units.

[0042] Add 5L of artificially synthesized pig manure hydrolyzate into the salt chamber, adjust its pH to 5 with nitric acid and sodium hydroxide, and its composition is shown in Table 1; add 1L of deionized water to the alkali chamber and acid chamber respectively; Add 1L sodium sulfate solution, the concentration is 0.1mol / L. The inlets and outlets of the salt chamber, alkali chamber, acid chamber and electrode chamber of the membrane stack are connected to their respective solution tanks with sil...

Embodiment 2

[0048] Example 2: The actual pig manure hydrolyzate was treated by bipolar membrane electrodialysis.

[0049] This example is to illustrate that the actual pig manure hydrolyzate conforms to the two-stage ion removal rule, and the reflux of the acid solution can improve the phosphorus concentration and separation efficiency. The experimental device used is the same as that described in Example 1, except that 1 L of pretreated pig manure hydrolyzate is housed in the salt chamber.

[0050] The pig manure hydrolyzate is taken from the septic tank of the pig house. Before the pig manure hydrolyzate is taken, the pig manure has undergone preliminary hydrolysis in the septic tank for at least two weeks. Add hydrochloric acid to the pig manure hydrolyzate to adjust the pH value to 5, settle for 24 hours, remove scum and foam; take the supernatant and centrifuge it at a low speed of 3000rpm, then centrifuge it at a high speed of 10000rpm, filter it through ordinary filter paper, and f...

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Abstract

The invention discloses a method for recycling ammonia nitrogen, phosphorus and volatile fatty acid in livestock-poultry excrement hydrolysate by two-stage bipolar membrane electrodialysis; the method comprises: pretreating livestock-poultry excrement hydrolysate, adding into a bipolar membrane electrodialytic saline chamber, and extracting ions contained in the hydrolysate. The reaction process is divided into a front phase and a rear phase according to voltage changes, namely a strong electrolyte removal phase and a weak electrolyte removal phase; finally, ammonia nitrogen, chlorine ions and sulfates are removed in the first phase equivalently, while phosphates and weak acids such as VFAs (volatile fatty acids) are removed in the second phase. The produced strong acid solution is subjected to reflow for adjusting pH of the hydrolysate during pretreatment; when pH is 5, about 90% of solid phosphorus is released, and the VFAs separation efficiency is improved. The two-phase separation method according to the invention enables ions in the excrement hydrolysate to be removed and recycled in class-based form, loss of ion diffusion between adjacent compartments in late reaction is decreased, and product recycling rate is increased.

Description

[0001] 1. Technical field [0002] The invention relates to a method for recovering ammonia nitrogen, phosphorus and volatile fatty acids in livestock and poultry feces hydrolyzate by using two-stage bipolar membrane electrodialysis, and belongs to the technical field of waste water and solid waste treatment and resource recovery. [0003] 2. Technical background [0004] my country is a big meat producer in the world, with huge annual output of pork, chicken, mutton, beef, etc. In 2016, the total output of meat in my country was more than 83 million tons, and the output of poultry and eggs reached more than 30 million tons. Among them, the daily diet of the Chinese is mainly pork, which leads to my country's pork production accounting for 52% of the world's total pork production, ranking first in the world all year round. The huge demand for meat has driven the scale growth of the livestock and poultry farming industry, but the large amount of livestock and poultry manure it ...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F11/00C02F103/20C02F101/10C02F101/12C02F101/16C02F101/34
CPCC02F1/4693C02F11/006C02F2101/105C02F2101/12C02F2101/16C02F2101/34C02F2103/20
Inventor 占新民石林胡真虎王文静王伟袁守军
Owner HUANGSHAN TIANZHIDU ENVIRONMENTAL SCI & TECH DEV CO LTD
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