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Deep dewatering method for sludge

A technology of deep dewatering and sludge dewatering, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of low utilization rate and restrict wide application, so as to improve dewatering performance, cheap and easy to obtain chemicals, and is conducive to the follow-up. effect of treatment

Inactive Publication Date: 2012-04-11
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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Problems solved by technology

But since in practical application H 2 o 2 The utilization rate is not high, and the reaction is required to be carried out under low pH conditions, which restricts the wide application of this method in sewage treatment

Method used

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  • Deep dewatering method for sludge
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Embodiment Construction

[0016] A method for deep dehydration of sludge, which method specifically includes the following steps:

[0017] a. Adjust the pH of the concentrated sludge to about 3 with acid, generally 2.5-3.5. The acid used is dilute sulfuric acid, and other acidic industrial raw materials can also be used; biological acidification is not recommended because it induces new The formation of microbial flora is not conducive to subsequent dehydration.

[0018] b. Add Fe-containing at a weight ratio of 0.1 to 0.3% of the dry weight of the sludge 2+ Or Fe 3+ Iron salt, Fe 2+ And Fe 3+ The conditioning effects of iron salts are not very different. Add H at a weight ratio of 1 to 3% of the dry weight of the sludge 2 O 2 Or peracetic acid; stir quickly at a speed of 100~200rpm for 1~3min, and stir at a speed of 10~30rpm for 20~40min. The higher the temperature, the same conditioning effect will be obtained. The consumed H 2 O 2 Or the less peroxyacetic acid; but the heating cost is higher, and it is r...

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Abstract

The invention discloses a deep dewatering method for sludge, which is characterized by comprising the following steps of: a. adjusting the pH value of condensed sludge to 2.5-3.5 by using an acid; b. adding molysite and then adding H2O2 or a peroxyacetic acid into the condensed sludge, and then stirring the obtained mixture rapidly; c. adding a framework material into the obtained sludge, and adjusting the pH value of the sludge to 6.8-7.2; and d. carrying out dewatering on the obtained sludge. The method disclosed by the invention has the advantages that adopted medicaments are cheap and easy to obtain; and after adjustment, the sludge has a degree of stability, pathogenic bacteria are killed, and the stench of the sludge is removed at the same time, therefore, the method facilitates the follow-up treatment of sludge.

Description

Technical field [0001] The invention belongs to the technical field of sludge treatment, and is specifically a method for deep dehydration of sludge using advanced oxidation technologies such as fenton and fenton-like. Background technique [0002] Sludge dewatering is the most common sludge treatment unit technology used in sewage plants in my country, and its application rate is almost 100%. Dewatering can not only reduce the amount of sludge drastically, but is also a necessary link for subsequent sludge treatment and disposal (landfilling, incineration, land use, etc.). [0003] Sludge dewatering usually includes two steps: pretreatment and mechanical dewatering. At present, the most widely used pretreatment method in my country is flocculant single and double conditioning, single conditioning agent is polyacrylamide, and double conditioning is followed by polyaluminum salt or iron. Salt conditioning; belt filter press and centrifugal dehydration account for more than 90% of me...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 王国华孙晓张辰
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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