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Resourceful treatment method of sludge from sewage plant

A treatment method and technology of a sewage plant, applied in the direction of sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as insufficient security, groundwater pollution, environmental impact, etc., and achieve zero Emissions and cleaner production, less investment, and faster response

Inactive Publication Date: 2014-07-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pathogens may still survive in composted sludge products, and the high moisture content (30%-40%) of the product can revive pathogens, so composting is not enough to ensure safety
At the same time, sludge also contains toxic and harmful substances, and direct application in agriculture will cause secondary pollution of soil and water: (1) heavy metals in sludge will cause secondary pollution of groundwater, soil and crops; (2) pathogens in sludge It will affect the environment; (3) Excessive concentration of nitrogen, phosphorus and other substances will cause pollution to groundwater

Method used

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  • Resourceful treatment method of sludge from sewage plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First put the sludge with a water content of 97-99% from the sewage plant into the hydrolysis reactor, add the catalyst sodium hydroxide, the amount of the catalyst added is 10% of the weight of the sludge, and under the pressure of 0.2-0.5MPa, Heat to 130°C-150°C, carry out catalytic hydrolysis reaction for 2 hours, and the moisture content of the sludge after the reaction will drop to 30-40%. The organic matter and inorganic matter in the hydrolysis reactor are separated, the brown liquid is organic waste liquid, and the remaining solid is mainly inorganic matter containing aluminum and iron solids.

[0026] The aluminum-containing iron solid is further processed to prepare a flocculant;

[0027] The separated organic waste liquid produces granular sludge, methane and liquid organic fertilizer through efficient anaerobic technology;

[0028] The preparation of the above-mentioned flocculant: first dry the aluminum-containing iron solid at 105°C, grind it, pass throug...

Embodiment 2

[0034] The sewage was treated with the polyaluminum ferric chloride (PAFC) flocculant prepared in Example 1.

[0035]The effluent of the primary sedimentation tank of a sewage plant was used for coagulation experiments. The water quality of the effluent of the primary sedimentation tank of the sewage plant is as follows: COD is 220mg / L, TP is 2.8mg / L, and turbidity is 250NTU. Polyaluminum ferric chloride (PAFC) flocculant of the present invention is compared with commercially available PAFC, has confirmed the superiority of the coagulation effect of the present invention (as figure 2 ).

[0036] Coagulation experiments were carried out with different coagulants (the average water temperature was 20°C, and the pH of the water sample was about 7.2), the COD and turbidity of the treated water samples were measured respectively, and the treatment effect under the optimal dosage (60mg / L) was compared. .

[0037] The polyaluminum ferric chloride (PAFC) flocculant synthesized from...

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Abstract

The invention relates to a resourceful treatment method of sludge from a sewage plant. The resourceful treatment method comprises the steps of firstly separating organic substances from inorganic substances in sludge from the sewage plant by catalytic hydrolysis under the conditions of the temperature of 130-150 DEG C and the pressure of 0.2-0.5MPa to obtain an aluminum-iron-containing solid and an organic waste solution; finally carrying out resourceful treatment respectively: pumping the organic waste solution into an anaerobic reactor, carrying out an efficient anaerobic reaction for 24 hours at 35 DEG C to obtain methane, a liquid organic fertilizer and granular sludge, drying the aluminum-iron-containing solid, grinding and sieving to obtain sludge powder, adding 5mol / L of hydrochloric acid into the sludge powder, reacting at 90 DEG C for 1-2 hours, standing and taking the supernatant, adjusting pH of the supernatant to 2.5-4 and curing at 50-60 DEG C for 12 hours to obtain a polyaluminum ferric chloride flocculant. The resourceful treatment method disclosed by the invention is simple in process, low in cost and high in economic and social benefits. The zero discharge of sludge in the sewage plant and clean production can be achieved and the method can be widely used in the resourceful treatment of sludge in the sewage plant.

Description

technical field [0001] The invention relates to a resource treatment method for sewage plant sludge. The invention belongs to the technical field of sludge resource treatment and disposal. Background technique [0002] As the discharge standards of sewage plants have been raised from Class B to Class A, the biochemical methods adopted by many sewage plants cannot make phosphorus discharge meet the standard. In order to meet this standard, many sewage plants generally adopt chemical methods to remove phosphorus, which further increases the output of sludge produced by sewage plants. [0003] Sewage plant sludge generally refers to the sediment, particulate matter and floating matter produced when wastewater is treated by physical, chemical, physicochemical and biological methods. Sludge often contains a large amount of excessive heavy metals, pathogenic microorganisms, organic matter and rich nitrogen, phosphorus, potassium and other nutrients. It has high water content, is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 潘碌亭吴坤
Owner TONGJI UNIV
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