A kind of treatment method of sewage sludge

Abstract

A treatment method for sludge from a sewage plant. The sewage sludge is spread on the ground with a thickness of 15-20 cm, sprayed with deodorant dilution and EM bacteria dilution A, and then rotary tillage; when the water content in the sludge is When the 85%-90% drops to 50%-60%, then use a loader to pile up sludge piles for fermentation, and when the temperature drops to 60-65°C, use a stacker to turn the piles upside down, so that the inside of the sludge piles The sludge is mixed with air; the sludge is biodegraded and fermented by EM bacteria, and its water content drops to 32%-37% by mass; after the fermented sludge is spread and rotated to dry for 3 days, the water content in the sludge The mass percentage drops to 18%-20%, and the treatment ends after crushing. A treatment method for sewage plant sludge, which has short treatment time and good treatment effect, and the treated sludge has no harmful substances and high nutrient content, and can be used as a raw material for organic fertilizer; it also contains combustible substances, and can be used as fuel auxiliary materials, combustion Raw materials for making bricks, etc.

Description

technical field [0001] The invention relates to a method for treating sludge, in particular to a method for preparing organic fertilizer raw materials. Background technique [0002] Sewage plant sludge refers to the flocs produced in the process of water treatment. It contains a large amount of water, rich organic matter and nutrients such as N, P, and K. It also contains harmful substances such as heavy metals and pathogenic bacteria. If it is discharged arbitrarily without treatment , not only pollute the environment, but also a serious waste of resources. According to incomplete statistics, the national sewage discharge is 4474×10 7 m 3 / d, There are more than 100 sewage treatment plants of different scales and degrees of treatment. The amount of sludge produced every day is about 5%-10% of the sewage treatment volume, and the traditional disposal methods include landfill, incineration and ocean discharge. [0003] Simply put, incineration treatment is to dissipate he...

AI Technical Summary

Problems solved by technology

[0004] However, the disadvantages of this kind of treatment method are: 1. The sludge incineration treatment needs to invest in large drying equipment, and the technical requirements are high, the investment is large, and the recovery is slow.

2. The calorific value of the sludge itself is too low, and the combustion power generation effect is not good

3. Sludge combustion will emit a lot of odor and pollute the environment

Disadvantages: 1. The mixing of sludge and lime will emit unpleasant stench after chemical reaction, causing air pollution

2. If the sludge is not completely solidified, filling the ditch will cause the foundation to be unstable or even create a swamp pit, which has certain safety hazards

3. Higher requirements for anti-leakage and explosion-proof facilities are likely to cause secondary pollution

4. Landfill treatment does not meet the requirements for sludge reduction treatment

The application of EM bacteria to the treatment of sludge has been generally recognized, but the current method adopts one-time addition of bacteria after stacking and drying, and one-time addition of bacteria after stacking and drying of wet sludge, relying on the daily stirring of the stacker. Fully fermented, the fermentation cycle is as long as 27-28 days, and the work efficiency is low

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