Method for preparing flocculant, fertilizer and methane with algae-containing sludge

A flocculant, compound fertilizer technology, applied in the oxidation treatment of sludge, flocculation/sedimentation water/sewage treatment, application, etc., can solve the problems of insufficient safety, concentration groundwater pollution, environmental impact, etc., to achieve zero discharge And the effect of cleaner production, fast response and low investment

Inactive Publication Date: 2010-09-08
TONGJI UNIV
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Problems solved by technology

However, pathogens may still survive in the sludge products after composting, and the high moisture content (30%-40%) of the products can revive the pathogens, so the composting method is not enough to ensure safety. If it is directly applied to agriculture, it will cause soil pollution. And secondary pollution of water bodies: (1) Heavy metals in sludge will cause secondary pollution of groundwater, soil and crops; (2) Pathogens in sludge will affect the environment; (3) The concentration of nitrogen, phosphorus and other substances is too high will pollute the groundwater

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  • Method for preparing flocculant, fertilizer and methane with algae-containing sludge
  • Method for preparing flocculant, fertilizer and methane with algae-containing sludge

Examples

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Embodiment 1

[0023] A. Add the algae-containing sludge with a moisture content of 96%-99% from the sewage treatment plant to the hydrothermal reactor, and then add commercially available hydrogen peroxide with a concentration of 30% by mass. The amount of hydrogen peroxide added is 50mg / L volume of algae-containing sludge, under the pressure of 0.8-1MPa, heated to 150-180°C, and reacted for 1.5-2.5h. After the reaction, let it stand for 30 minutes, the yellowish brown liquid is organic residual waste liquid, its COD is 10000-20000mg / L, and the remaining solid is solid sludge containing aluminum and iron inorganic substances.

[0024] B, flocculant preparation, first dry the solid sludge at 120°C, grind, pass through a 100-mesh sieve, and the under-sieve is sludge powder with a particle size of less than 100 mesh; then add molar concentration of 5mol / L to the under-sieve Hydrochloric acid, the amount of hydrochloric acid added according to the mass ratio of sludge powder: hydrochloric acid ...

Embodiment 2

[0028] The polyaluminum ferric chloride flocculant prepared in Example 1 was used to treat sewage, and the biochemical effluent of a certain sewage plant was used for coagulation experiments. Comparing the polyaluminum ferric chloride of the present invention with the commercially available PAC, it is confirmed that the coagulation effect of the flocculant of the present invention is superior to that of the commercially available PAC.

[0029] The water quality of the biochemical effluent from the sewage plant is as follows: COD is 80mg / L, TP is 3mg / L, and turbidity is 25NTU. Coagulation experiments were carried out with different coagulants (the average water temperature was 20°C and the pH of the water sample was about 6.5), the COD and turbidity of the treated water samples were measured respectively, and the treatment effect under the optimal dosage (60mg / L) was compared : The removal rate of commercially available PAC to biochemical effluent COD, TP and turbidity is about...

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Abstract

The invention relates to a method for preparing flocculant, fertilizer and methane with sludge containing algae, which relates to a process for turning the sludge containing algae into resources. First, a hydrothermal oxidation technology is adopted to separate organic matter and inorganic matter in the sludge containing algae under the conditions of 150 to 180DEG C of temperature and 0.8 to 1MPa of pressure to obtain brown organic residual waste liquid and solid sludge containing aluminum and iron inorganic matter; and then the solid sludge is dried, ground and screened; hydrochloric acid is added into screen underflow to react for 1 to 2h at 90 to 100DEG C, and stays still; the pH value of a supernatant is regulated to 2.5 to 4, and the supernatant is cured for 12h at 50 to 60DEG C to obtain a PAC iron liquid product; the PAC iron liquid product is dried, and a PAC iron solid product is obtained; and the pH value of the organic residual waste liquid is regulated to 8 to 9, and the organic residual waste liquid enters an upflow anaerobic sludge bed reactor to react for 24h at 35DEG C to obtain granular organic fertilizer and combustible gas with 65 percent of methane content. The method for preparing flocculant, fertilizer and methane with algae-containing sludge has the advantages of simple process, low cost and high economic and social benefit, and can be widely applicable to the zero algae-containing sludge discharge and the clean production of sewage plants which treat lake sewage polluted by algae.

Description

technical field [0001] The invention discloses a method for preparing flocculant, compound fertilizer and methane from algae-containing sludge, and relates to a sludge resource treatment and disposal method. It belongs to the technical field of sludge resource disposal Background technique [0002] A prominent problem brought about by eutrophication of water bodies is the outbreak of cyanobacteria blooms. The so-called water blooms are a natural ecological phenomenon in which algae proliferate in fresh water bodies. Cyanobacteria (should be called cyanobacteria in the strict sense), green algae, diatoms and other algae become the dominant population in the water body, and a phenomenon in which the water body appears blue or green after multiplying in large numbers. Large-scale cyanobacterial blooms reduce the efficiency of water resource utilization, causing serious ecological damage and huge economic losses, while the production of cyanobacterial toxins has brought great ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C02F1/52C05G1/00C12M1/107C02F11/06
CPCY02E50/343Y02E50/30
Inventor 潘碌亭吴锦峰张亚雷王文蕾余波
Owner TONGJI UNIV
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