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Biogas slurry treatment method

A treatment method, biogas slurry technology, applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high cost and poor ammonia nitrogen removal effect, and achieve good applicability, high treatment effect, The effect of the simple processing method

Inactive Publication Date: 2016-06-15
BEIJING UNIV OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems of poor ammonia nitrogen removal effect and high cost in the biogas slurry existing in the prior art, this application provides a biogas slurry purification treatment method, which is simple, has good treatment effect and low cost, and makes the purified biogas slurry It can be discharged directly, and the removal efficiency of harmful substances is over 90%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 1. Preparation of precipitant

[0074] Ferric chloride is mixed with water to prepare a high-concentration ferric chloride precipitant mother liquor with a concentration of 50g / L for subsequent use. Take an appropriate amount of ferric chloride precipitant mother liquor and dilute it to prepare a ferric chloride solution with a concentration of 960 mg / L to obtain a precipitant.

[0075] In order to reduce the workload and avoid the poor treatment effect caused by errors, this application first prepares the precipitant with a high concentration of mother liquor, and then takes an appropriate amount of mother liquor to dilute it into the precipitant with the required concentration, which reduces the number of times The workload of preparation avoids errors caused by multiple preparations, so the processing method of biogas slurry in this application is more convenient and accurate.

[0076] The treatment method of the present application can also use polyaluminum chlorid...

Embodiment 2

[0113] In addition to adding 12.8mL of ferric chloride precipitant mother liquor with a concentration of 640mg / L to the beaker containing 1L biogas slurry, the stirring speed of the first stirring stage of the stirring treatment was 250r / min, and the stirring time was 60s; The stirring rate was 20r / min, and the stirring time was 20min; then the stirred mixture was left to stand for 40min, and the others were the same as in Example 1. The measurement results are shown in Table 1.

Embodiment 3

[0115] In addition to adding 6.4mL of ferric chloride precipitant mother liquor with a concentration of 320mg / L to the beaker containing 1L biogas slurry, the stirring speed of the first stirring stage of the stirring treatment was 350r / min, and the stirring time was 30s; The stirring rate was 100r / min, and the stirring time was 10min; then the stirred mixture was left to stand for 40min, and the others were the same as in Example 1. The measurement results are shown in Table 1.

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Abstract

The invention discloses a biogas slurry treatment method and relates to the field of sewage treatment. The biogas slurry treatment method comprises the following steps: adding a precipitant into the to-be-treated biogas slurry, and filtering to obtain crude biogas slurry; measuring the ammonia nitrogen concentration in the crude biogas slurry; determining the dosage of phosphate and magnesium salt in a cleaning agent according to the measured ammonia nitrogen concentration, the molar ratio of magnesium ions to ammonium ions and other parameters; sequentially adding the phosphate and magnesium salt into the crude biogas slurry; and stirring and filtering to obtain purified biogas slurry. The biogas slurry purified by the method meets the requirements of national standard Discharge Standard off Pollutants for Livestock and Poultry Breeding (GB 18596-2001), and the treatment method is simple and has high efficiency and wide universality.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for treating biogas slurry. Background technique [0002] With the improvement of people's living standards in our country, the large-scale livestock and poultry breeding industry has developed rapidly and produced a large amount of breeding manure. At present, anaerobic fermentation process is mostly used in China to treat these manure, which effectively reduces the primary pollution of farm manure. But not all manure treated by anaerobic fermentation process can be fully utilized. Due to the different areas of the breeding sites, the treatment method that can completely consume the treated wastewater can only be applied to livestock and poultry sites with appropriate farmland, fish ponds or aquatic plant ponds around them, and the overall system arrangement of ecological agriculture environment. Most farms do not have sufficient conditions and corresponding capacity t...

Claims

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Application Information

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IPC IPC(8): C02F1/52C05F7/00
CPCC02F1/5245C02F2301/08C05F7/00Y02A40/20Y02E50/30Y02W30/40
Inventor 刘克峰
Owner BEIJING UNIV OF AGRI
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