Pretreatment method for increasing yield of excess sludge anaerobic digestion methane

A technology of excess sludge and anaerobic digestion, which is applied in the direction of sludge treatment, sludge treatment, biological sludge treatment, etc., can solve the problem of no combination of microwave and calcium peroxide, and achieve the mature and easy operation of microwave technology, and promote Dissolution, beneficial to the effect of subsequent processing

Inactive Publication Date: 2016-01-20
TONGJI UNIV
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  • Pretreatment method for increasing yield of excess sludge anaerobic digestion methane
  • Pretreatment method for increasing yield of excess sludge anaerobic digestion methane
  • Pretreatment method for increasing yield of excess sludge anaerobic digestion methane

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Embodiment 1

[0024] Concentrate the remaining sludge discharged from the sewage treatment plant to VSS=8.5g / L, (TSS is about 12.9g / L, pH is about 6.9), add commercially available analytically pure calcium peroxide, and the dosage of calcium peroxide is Add 0.2g of calcium peroxide to the volatile suspended solids, stir evenly, and place it under 160W microwave radiation for 6 minutes. The treated sludge is sealed and placed in an anaerobic digestion tank with a temperature of 35°C and a stirring speed of 150rpm for anaerobic digestion. Aerobic fermentation, anaerobic digestion days are 16 days. In addition, the above-mentioned excess sludge was subjected to anaerobic fermentation under the same operating conditions without adding calcium peroxide, without microwave treatment, and as a blank anaerobic digestion group. The results show that the combined use of microwave and calcium peroxide of the present invention has a better dissolving effect on sludge, and it is shown that the discharge ...

Embodiment 2

[0026] Concentrate the remaining activated sludge discharged from the sewage treatment plant to VSS=8.5g / L, (TSS is about 12.9g / L, pH is about 6.9), add commercially available analytically pure calcium peroxide, and the dosage of calcium peroxide is For every gram of volatile suspended solids, add 0.1g of calcium peroxide, stir evenly, and place it under 320W microwave radiation for 4 minutes. The treated sludge is sealed and placed in an anaerobic digestion tank with a temperature of 35°C and a stirring speed of 150rpm. Anaerobic digestion, the number of days for anaerobic digestion is 16 days. The blank group did not add calcium peroxide, did not carry out microwave treatment, and other operating conditions were the same. The results show that the combined use of microwave and calcium peroxide has a better effect on sludge dissolution, and the release of dissolved chemical oxygen demand in the microwave / calcium peroxide group reaches 4295mg / L, 4209mg / L and 4000mg / L, higher ...

Embodiment 3

[0028] A certain volume of residual activated sludge discharged from the sewage treatment plant is concentrated to VSS=8.5g / L, (TSS is about 12.9g / L, pH is about 6.9), and commercially available analytically pure calcium peroxide is added, and calcium peroxide is added The amount is to add 0.05g of calcium peroxide per gram of volatile suspended solids, stir evenly and place it under 480W microwave radiation for 2 minutes. The treated sludge is sealed and placed in an anaerobic fermentation tank with a temperature of 35°C and a stirring speed of 150rpm Anaerobic fermentation was carried out in , and the fermentation days were 16 days. In the anaerobic digestion group, calcium peroxide was not added, microwave treatment was not performed, and other operating conditions were the same. The results show that the combined use of microwave and calcium peroxide has a better effect on sludge dissolution, and the release of dissolved chemical oxygen demand in the microwave / calcium pero...

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Abstract

The invention relates to a pretreatment method for increasing the yield of excess sludge anaerobic digestion methane. Firstly, calcium peroxide is added into remaining concentrated sludge of a sewage treatment factory, and the addition amount of calcium peroxide accounts for 5-20% of the mass of volatile suspended solid in the remaining sludge; then, microwave radiation is carried out, the mixture is placed in an anaercbic digestor for anaerobic digestion at the temperature of 30-40 DEG C at the stirring speed of 100-200 rpm, and anaerobic digestion time is about 16 days. Results show that the calcium peroxide/microwave combined pretreatment technology can promote dissolving of particulate organic matter, increase the yield of the sludge anaerobic digestion methane and improve dewaterability of sludge after anaerobic digestion. The method is easy to operate, moderate in reaction condition and good in economic benefit and social benefit and is used for recycling, harmlessness and reduction of the remaining concentrated sludge of the sewage treatment factory.

Description

technical field [0001] The invention relates to a pretreatment method for increasing the amount of methane produced by anaerobic digestion of surplus sludge. The invention belongs to the technical field of sludge treatment and resource utilization. Combined use of microwave and peroxide Background technique [0002] At present, the most widely used sewage biological treatment technology in the world is the activated sludge method, which plays an important role in reducing urban pollution load. However, the activated sludge method has always had a disadvantage, that is, a large amount of excess sludge will be produced. With the increasing amount of sewage treatment and the continuous improvement of sewage treatment efficiency, the output of excess sludge is showing an increasing trend, and the treatment and disposal of sludge has become a major problem for sewage treatment plants. Sludge is rich in organic components. If these resources can be recycled, the economic pressu...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/04
CPCY02E50/30Y02W10/20
Inventor 李咏梅王婕任潇卢霄张浩浩
Owner TONGJI UNIV
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