Method and apparatus for producing organic fertilizer with sewage and sludge

A technology for sewage sludge and organic fertilizer, which is applied in the fields of sewage/sludge fertilizer, preparation of organic fertilizer, organic fertilizer, etc., and can solve the problem that the production volume of sewage sludge or related processes has not been fully established, and the recycling of sewage sludge Restricted, unable to provide reliability, etc., to achieve the effect of improved physicochemical properties, accelerated growth, improved quality and yield

Inactive Publication Date: 2012-05-30
KOREA INST OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, methods for controlling the generation of sewage sludge or related processes are not well established
Furthermore, even with such methods of producing fertilizers from sewage sludge according to the related art, there arises another problem that the presence of high concentrations of harmful heavy metals in sewage sludge

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  • Method and apparatus for producing organic fertilizer with sewage and sludge
  • Method and apparatus for producing organic fertilizer with sewage and sludge
  • Method and apparatus for producing organic fertilizer with sewage and sludge

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Embodiment

[0057] Examples (and experiments) are described to characterize the organic fertilizers disclosed herein. The following examples (and experiments) are for illustrative purposes only and are not intended to limit the scope of the invention.

[0058]

[0059] First, dewatered blocks of sewage sludge with a water content of 75%-80% were collected from an environmental business center located in Kyong-gi Do, Korea. Thereafter, 0.6 L of 1M sulfuric acid (30% by weight) was added to 2 kg of sewage sludge and the mixture was stirred for 6 hours to perform heavy metal extraction while killing microorganisms. The sewage sludge mixed with 1 M sulfuric acid was then subjected to solid-liquid separation using a high-speed centrifugal separation system (3000 rpm). Thereafter, the separated solid sludge was mixed with 60 g of quicklime (3% by weight) and reacted to neutralize the sludge. Then, 200 g of loess powder (10% by weight) was added and mixed with the neutralized sludge, and nat...

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Abstract

The utility model discloses a method and an apparatus for safely producing organic fertilizer with reasonable costs. The method comprises the steps of effectively extracting and removing the heavy metal contained in sewage and sludge with acid; carrying out one-step sterilization to remove pathogenic microorganism; and replenishing the essential nutrients required by the crops. The method for producing organic fertilizer with sewage and sludge specifically comprises: mixing the sewage and sludge with acid, thus to extract the heavy metal from the sewage and sludge to liquid phase; carrying out solid-liquid separation over the mixture of the sewage sludge and the acid, thus to separate the solid component of the sewage and sludge from the liquid containing the metal heavy dissolved in the liquid; mixing the solid components of sewage and sludge with unslaked lime, thus to neutralize the sewage and sludge; and mixing the neutralized sewage and sludge with loess, thereby obtaining the organic fertilizer.

Description

technical field [0001] The present invention relates to a method and apparatus for the production of organic fertilizers from sewage sludge, and more particularly to a safe and cost-effective method and apparatus for the production of organic fertilizers from sewage sludge comprising the efficient extraction and removal of Contains heavy metals, 2-step sterilization to remove pathogenic microorganisms, and supplement essential nutrients needed by crops. Background technique [0002] Generally, in sewage treatment plants, waste water and food waste generated in daily life are treated by physicochemical methods and biological methods. This inevitably produces sewage sludge as a by-product. Sewage sludge is a general term for liquid floating substances produced during sewage treatment, and includes, when sewage introduced into a sewage treatment plant remains in the first settling tank, raw sludge settled by gravity, and excess sludge, Recycled sludge, concentrated sludge, an...

Claims

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Application Information

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IPC IPC(8): C05F7/00C02F11/00
CPCY02A40/20C02F11/004C05D3/02C05F7/00C05F17/80C05G1/00
Inventor 崔龙洙庾荷娜郑在植李相协李锡宪
Owner KOREA INST OF SCI & TECH
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