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Method for producing agriculture fertilizer by sludge in water treatment plant

A technology for sewage treatment plants and sewage treatment plants, applied in the fields of sewage/sludge fertilizer, sludge treatment, biological sludge treatment, etc., can solve problems such as affecting land use, improve safety, reduce production costs, and achieve valuable economic benefits Effect

Active Publication Date: 2009-02-04
TONGJI UNIV
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  • Description
  • Claims
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Problems solved by technology

However, when this technology is used in the pre-treatment of sludge land use, there is also the problem of the storability of the mud cake; at the same time, the acidity of the mud cake produced after the bioleaching treatment (pH is usually less than 2) will also affect the land use. effect

Method used

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  • Method for producing agriculture fertilizer by sludge in water treatment plant
  • Method for producing agriculture fertilizer by sludge in water treatment plant

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Embodiment Construction

[0027] The following is a sewage treatment plant with a sludge dry solid production of 20t / d (equivalent to a daily sewage treatment of 100,000 m 3 sewage treatment capacity) as an example, combined with the attached figure 1 , 2 The specific embodiment of the present invention is introduced.

[0028] The amount of concentrated sludge in a sewage treatment plant with a sludge dry solid production of 20t / d is about 400m 3 / d (water content 95%), first add 0.3% iron sulfide (FeS) to the concentrated sludge, mix well, and then enter the aeration digester for digestion; each aeration digester consists of 2 diameter It is composed of different concentric cylinders. The outer cylinder is a closed structure. The lower part is equipped with a sludge inlet, the upper part is equipped with an overflow sludge outlet, and the top is provided with a gas release port; the upper and lower ends of the inner cylinder are open. Gas release pipe; the inner diameter of the outer cylinder of ea...

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Abstract

The invention discloses a making method of fertilizer through effluent sludge, which comprises the following steps: adding 0.3% FeS into condensed predisposed sludge; entering into aerating digestive device; setting the dissolved oxygen at 2.0-1.5mg / l for 6d; dehydrating digestive sludge in the horizontal screw discharge centrifuger with centrifugal separating factor at 1800-2200; obtaining sludge pie; blending coal ash and broken stone into filter; draining reflux liquid; making the sludge pie and coal ash to water content at 55%-58%; obtaining the product with the content of N, P, and K at 8-10%.

Description

technical field [0001] The invention discloses a method for processing sludge from a sewage treatment plant into agricultural fertilizer, relating to a process for producing agricultural fertilizer from the sludge from a sewage treatment plant. The invention belongs to the technical field of sludge treatment and resource utilization of urban sewage treatment plants. Background technique [0002] Sludge is an inevitable secondary product when urban sewage treatment adopts the mainstream process——biological method. The yield of sludge, calculated as dry solids, was 1.2×10 -4 -2.6×10 -4 t / m 3 ; The annual domestic sewage production per capita of urban residents in my country is 44-100m 3 Therefore, according to the existing urban population in my country, if the treatment rate of urban domestic sewage reaches 100%, the corresponding sludge dry solid production rate is 3.90-8.4 million tons / year, and the sludge dewatered cake with a moisture content of 80% Calculated, it can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F7/00C05F17/00C02F11/02C02F11/12C02F3/28C04B18/30
CPCY02A40/20Y02W10/20Y02W30/40Y02W30/91
Inventor 何品晶邵立明章骅吕凡
Owner TONGJI UNIV
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