Method for recycling anaerobic fermentation liquor

An anaerobic fermentation liquid and recycling technology, which is applied in the field of anaerobic fermentation liquid recycling, can solve the problems of high cost of chemicals, and achieve the effects of increasing processing costs, improving resource utilization, and improving recovery efficiency

Active Publication Date: 2020-06-09
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the phosphate and ammonium ions in the waste water are fully utilized, the bottleneck problem of expensive chemicals in the process of preparing struvite from the anaerobic fermentation broth will be solved to a certain extent.

Method used

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  • Method for recycling anaerobic fermentation liquor
  • Method for recycling anaerobic fermentation liquor

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Experimental program
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Effect test

Embodiment 1

[0066] Taking the biogas slurry produced by anaerobic fermentation of livestock and poultry wastewater as an example, the NH in the biogas slurry 4 + Concentration 1000mg / L, PO 4 3- The concentration is 100mg / L, Mg 2+ The concentration is 171mg / L, Ca 2+ The concentration is 189mg / L.

[0067] Add 1wt% activated sludge to the fermented liquid, first anaerobic treatment for 1h, then aeration treatment for 0.5h, the dissolved oxygen concentration is 0.5mg / L, and then pass through a multi-media filter (filter medium adopts quartz sand and anthracite) to remove particulate matter, Pump into FCDI module for desalination, select monovalent cation permselective membrane, and the current density of FCDI is 25A / m 2 , the hydraulic retention time is 8min, the mass fraction of activated carbon in the mobile electrode is 5%, the mass fraction of carbon black is 0.8%, the concentration of NaCl is 1mol / L, the contact angle of PTFE gaseous membrane is 120°, and the membrane pore size is 0...

Embodiment 2

[0070] Taking the biogas slurry produced by anaerobic fermentation of landfill leachate as an example, the NH in the biogas slurry 4 + Concentration 700mg / L, PO 4 3- The concentration is 40mg / L, Mg 2+ The concentration is 152mg / L, Ca 2+ The concentration is 167mg / L.

[0071] Add 3wt% activated sludge to the fermented liquid, first anaerobic treatment for 2h, then aeration treatment for 1h, the dissolved oxygen concentration is 3mg / L, and then remove particulate matter through a multi-media filter (filter medium adopts quartz sand and manganese sand), pump Into FCDI module for desalination, select monovalent cation permselective membrane, and the current density of FCDI is 13A / m 2 , the hydraulic retention time is 5min, the mass fraction of activated carbon in the flow electrode is 15%, the mass fraction of carbon black is 1.2%, the concentration of NaCl is 3mol / L, the contact angle of PTFE gaseous membrane is 130°, and the membrane pore size is 0.47μm , the porosity is 9...

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Abstract

The invention relates to the technical field of wastewater recycling, which relates to the technical field of biotechnology, in particular to a method for recycling anaerobic fermentation liquor, theanaerobic fermentation liquor comprises NH4<+>, PO4<3-> and organic matters, and the method comprises the following steps: (1) anion-cation separation is performed on the anaerobic fermentation liquorthrough an anion electrodialysis membrane and a cation electrodialysis membrane of FCDI to obtain a FCDI effluent; (2) the negative electrode chamber of the FCDI adsorbs NH4 < + > to form ammonia gas, and sulfuric acid is introduced to generate ammonium sulfate; and (3) precipitating is carried out in the negative electrode chamber and the positive electrode chamber of the FCDI, a supernatant isrespectively taken, the materials are mixed, and Mg<2+> and alkali are added to prepare struvite, so that the product has the advantages of high nitrogen and phosphorus yield, high struvite purity andgood benefit.

Description

technical field [0001] The invention relates to the technical field of waste water recycling, in particular to a method for recycling anaerobic fermentation liquid. Background technique [0002] The residual liquid after anaerobic fermentation such as kitchen waste, poultry manure, and excess sludge is called anaerobic fermentation liquid. Anaerobic fermentation fermented products soaked in the liquid for a long time, some soluble nutrients gradually transfer from the solid phase to the liquid phase, so the fermented liquid is rich in a large number of macronutrient elements, which increases the nutrient content in the fermented liquid; it also contains many micronutrient elements , such as calcium, copper, iron, zinc, manganese, etc., are also rich in amino acids, vitamins, various hydrolytic enzymes, certain plant hormones, and substances or factors that can inhibit pests and diseases. In rural areas, the most common way to treat fermentation liquid is to return biogas sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/469C01B25/45C01C1/242C05B17/00C05C3/00C02F101/10C02F101/16
CPCC01B25/451C01C1/242C01P2006/80C02F1/4691C02F9/00C02F2101/105C02F2101/16C05B17/00C05C3/00
Inventor 王宏洋吴越朱静赵晓丽汪霞
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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