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Sludge hydrolysis acidification liquid treatment method

A technology for sludge hydrolysis, acidification and treatment, which is applied in water/sludge/sewage treatment, biological water/sewage treatment, heating water/sewage treatment, etc. Achieve the effect of resource utilization, reduction of nitrogen and phosphorus concentration, and cost reduction

Pending Publication Date: 2019-09-03
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the presence of nitrogen and phosphorus in the acidification solution increases the load of nitrogen and phosphorus removal in sewage plants

Method used

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preparation example Construction

[0031] In the present invention, the preparation method of the sludge hydrolysis acidification liquid preferably comprises the following steps:

[0032] (i) Mix the excess sludge produced by sewage treatment plants with anaerobic granular sludge at a mass ratio of volatile solids (VS) of (5-20): 1, and perform anaerobic fermentation at 30-40°C for 3- 14d, obtain the fermentation product;

[0033] (ii) centrifuging the fermentation product, and taking the supernatant;

[0034] (iii) filtering the supernatant to obtain a hydrolysis acidification solution;

[0035] In the invention, firstly, the excess sludge produced by the sewage treatment plant and the anaerobic granular sludge are mixed for anaerobic fermentation to obtain a fermentation product. In the present invention, the source of the above-mentioned anaerobic granular sludge is not particularly limited, and conventional commercially available products in the field can be used. In the present invention, the mixing rat...

Embodiment 1

[0048] (1) Preparation of sludge hydrolysis acidification solution:

[0049] The anaerobic granular sludge was heated to 100°C and boiled for 30 minutes to kill the methanogenic bacteria in it. The inoculated mixed fermentation was carried out according to the mass ratio of excess sludge and anaerobic granular sludge volatile solids (VS) of 10:1. The fermentation temperature is controlled at 35±1°C, and the fermentation time is 5 days. Centrifuge the fermented mud-water mixture at a centrifugal speed of 10,000 r / min. After 10 minutes, take the centrifuged supernatant and pass it through a 0.45 μm organic mesembrane to obtain a hydrolysis acidification solution for cultivating microalgae.

[0050] (2) Preparation of culture medium:

[0051] After diluting the hydrolysis and acidification solution 5 times, sterilize with high pressure steam (121° C., 30 min), and then cool to room temperature to obtain a culture medium.

[0052] (3) Microalgae cultivation

[0053] Inoculate ...

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Abstract

The invention provides a sludge hydrolysis acidification liquid treatment method, and belongs to the technical field of ecological environmental protection. The method comprises: diluting a sludge hydrolysis acidification liquid 3-15 times with water, carrying out high pressure steam sterilization, and cooling to a temperature of 10-30 DEG C to obtain a culture medium liquid; inoculating microalgae into the culture medium liquid obtained in the step (1), and culturing for 5-12 d at a temperature of 20-30 DEG C to obtain a treatment liquid; and finally separating the algae in the treatment liquid to obtain a purified hydrolysis acidification liquid. According to the present invention, the treatment of the sludge hydrolysis acidification liquid with the microalgae and the culture of the microalgae are coupled, wherein the microalgae absorbs the pollutants in the hydrolysis acidification liquid and converts into biomass, such that the problem of the high cost of the nutrient salt and thewater source during the culture of the microalgae can be solved, the low cost of the microalgae culture medium and the production of the microalgae biomass are achieved, the nitrogen and the phosphorus in the hydrolysis acidification liquid can be absorbed and utilized by using the microalgae so as to reduce the concentrations of the nitrogen and the phosphorus in the sludge hydrolysis acidification liquid, and the resource utilization of excess sludge in the city can be achieved.

Description

technical field [0001] The invention belongs to the technical field of ecological environment protection, and in particular relates to a treatment method for sludge hydrolysis and acidification liquid. Background technique [0002] With the world's population growth and economic development, human beings' demand for energy continues to increase, and with the continuous consumption of oil, electricity and other natural resources on the earth, the energy crisis has become a real challenge that is not far away. The task of exploring and discovering new renewable clean energy is imminent. According to statistics, bioenergy is the most widely used renewable energy. Microalgae is the material for the preparation of the third generation of biomass energy. Its cultivation does not occupy agricultural land, and it grows rapidly, has high yield, and is rich in oil. Therefore, it is regarded as an ideal material for the preparation of bioenergy. In addition, microalgae contain a larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C12N1/12C12R1/89
CPCC02F1/02C02F3/322C12N1/12
Inventor 洪喻刘晓亚
Owner BEIJING FORESTRY UNIVERSITY