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Method for reducing arsenic content of biogas slurry

A content, biogas slurry technology, applied in biological sludge treatment, waste fuel, anaerobic digestion treatment, etc., can solve problems such as reducing COD removal rate, increasing environmental pollution, reducing methane production in anaerobic reactors, and achieving low cost , The process is simple, the effect of promoting precipitation

Active Publication Date: 2013-09-04
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Description
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Problems solved by technology

[0005] At present, some people use anaerobic granular sludge to add FeSO 4 It is not feasible to directly transplant this treatment method to the treatment of arsenic in the biogas slurry, because the added FeSO 4 Sulfate radicals in such enhancers will reduce the methane production of the anaerobic reactor, affect the load and treatment efficiency of the anaerobic reaction, reduce the COD removal rate, increase environmental pollution and additional investment and operating costs

Method used

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  • Method for reducing arsenic content of biogas slurry
  • Method for reducing arsenic content of biogas slurry
  • Method for reducing arsenic content of biogas slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The inoculum was the digestive juice after anaerobic fermentation of pig manure, the TS was 5%, the mass fraction of volatile solids (VS) was 78%, and the inoculum was 25% of the dry weight of the fermented material. Water was added to the mix so that the system TS load of the reactor was 6%. FeCl added to feed pig manure 2 (Based on iron content) dosages are 0, 0.2, 0.5 and 1.0 g / L respectively, with FeCl 2 The treatment with an amount of 0 was used as a control, and they were mixed with the raw materials and added to the continuous stirred reactor (CSTR) and the upflow sludge bed reactor (USB). The temperature of the reaction system was controlled at 35±2°C. Continuous feeding and discharging every day, and accurate monitoring of daily gas production and methane content to ensure stable operation of the reactor. The system was operated stably for 130 days, and samples were taken 17 times. The results are recorded in Table 1.

[0014] Table 1 The reduction rate and...

Embodiment 2

[0019] Inoculum and consumption are the same as in Example 1. FeCl addition to feed pig manure 2 and FeSO 4 Parallel experiments were carried out, and the addition amount (in terms of iron content) was 0, 0.2, 0.5 and 1.0 g / L respectively, and the treatment with 0 iron amount was used as the control. After mixing evenly with the raw materials, add water to adjust the system TS load of the reactor to 6%, and feed it into the CSTR reactor. Operating conditions and methods Example 1. The system ran stably for 130 days, and samples were taken and analyzed. The results are recorded in Table 2.

[0020] Table 2 FeCl addition 2 and FeSO 4 Decrease rate and gas production of arsenic in post-discharge biogas slurry

[0021]

[0022] Note: mean ± standard error (n=17)

[0023] It can be seen from Table 2: (1) FeCl is added to the feed 2 Compared with adding FeSO 4 It has a greater reduction effect on the content of arsenic in the discharged biogas slurry, and the reduction ra...

Embodiment 3

[0025] Inoculum and consumption are the same as in Example 1. FeCl addition to feed pig manure 2 , the addition is the same as in Example 1, which is used as a control group. FeCl addition to feed pig manure 2 , the addition amount is the same as that in Example 1, and the vegetable residue (quick-acting carbon source) is added at the same time, and the addition amount is 5% of the fermented dry matter weight, which is used as the experimental group. Before adding, the vegetable residues were crushed into small sections no larger than 3 cm, and water was added to the mixture so that the system TS load of the reactor was 6%, and then added to the CSTR reactor. The operation method and reaction conditions were the same as in Example 1. The system ran stably for 130 days, and the samples were taken and analyzed. The results are recorded in Table 3.

[0026] Table 3 Decrease rate of arsenic and gas production in discharged biogas slurry after adding available carbon sources

...

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Abstract

The invention relates to a method for reducing arsenic content of biogas slurry. The method comprises the following steps. Anaerobic fermentation inocula are added and conventional fermentation is carried out in a biogas production system. When the additive amount of inocula in the biogas production system increases to 10-40% of fermented substance dry weight, FeCl2 with a concentration of 0.2-1.0 g / L is added at the same time. The mixture is mixed uniformly and conventional fermentation is carried out. The optimum scheme is that quick-acting carbon source weighing 1-10% of raw material dry weight is added and mixed uniformly and conventional fermentation is carried out. The anaerobic fermentation inocula can be biogas residues of old biogas tanks, or putrid river mud, or fresh pig manure, or mixtures thereof. The quick-acting carbon source can be straws, or vegetable residues, or kitchen garbage, or vinasse, or mixtures thereof.

Description

technical field [0001] The invention belongs to the field of harmless treatment of agricultural waste. In particular, it provides a method of precipitating arsenic in the biogas residue in the biogas production system to reduce the arsenic content in the biogas slurry, which is conducive to the subsequent harmless treatment of the biogas slurry and its return to the field for utilization, and at the same time can improve the efficiency of anaerobic fermentation of manure. Gas production rate, to achieve the greatest degree of resource utilization of agricultural waste. Background technique [0002] Organic arsenic preparations have the effects of promoting growth and resisting diseases and insect pests in animals, and are widely used in intensive farms. The dosage of organic arsenic preparations in livestock and poultry diets is usually 50-100 mg / kg. In addition, human activities such as agricultural production (fertilizers, pesticides, herbicides) and mining cause a large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F3/28
CPCY02E50/30
Inventor 靳红梅常志州叶小梅付广青杜静陈广银张建英徐跃定
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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