KR20000049514A - Method of disposing sludge - Google Patents

Method of disposing sludge Download PDF

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Publication number
KR20000049514A
KR20000049514A KR1020000017169A KR20000017169A KR20000049514A KR 20000049514 A KR20000049514 A KR 20000049514A KR 1020000017169 A KR1020000017169 A KR 1020000017169A KR 20000017169 A KR20000017169 A KR 20000017169A KR 20000049514 A KR20000049514 A KR 20000049514A
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South Korea
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sludge
sludge treatment
crushed
rock powder
treatment agent
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KR1020000017169A
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Korean (ko)
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정효익
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임자병
정효익
임광천
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Priority to KR1020000017169A priority Critical patent/KR20000049514A/en
Publication of KR20000049514A publication Critical patent/KR20000049514A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/18—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side
    • B32B3/20—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side of hollow pieces, e.g. tubes; of pieces with channels or cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2607/00—Walls, panels

Abstract

PURPOSE: A sludge treatment process is provided which is economical and increase the credibility of treatment results, and especially, does not generate secondary pollutants such as harmful gases by treating the sludge at a room temperature, therefore the sludge can be reused as a soil conditioner which neutralizes acid soil and improves soil fertility. CONSTITUTION: A sludge treatment process comprises primarily crushing porous rocks; heat treating the crushed rock powder to activate various kinds of minerals, thereby removing heavy metals in the sludge by physical adsorption and ion-exchange neutralization of the minerals and eradicating odor and pathogenic bacteria by the irradiation of far-infrared ray; secondarily crushing the heat-treated rock powder to produce a sludge treating agent; mixing and stirring the sludge treating agent with sludge at a room temperature; and drying and grinding the mixture.

Description

슬러지 처리방법{METHOD OF DISPOSING SLUDGE}Sludge Disposal Method {METHOD OF DISPOSING SLUDGE}

본 발명은 정수나 하수처리 과정에서 생기는 침전물(슬러지)을 특수 제조한 처리제를 이용, 산성 토양을 중화시키고 공극률(空隙率)을 높여서 지력(地力)을 향상시킬 수 있는 토양개량제 등으로 재활용할 수 있게 처리하는 슬러지 처리방법에 관한 것이다.The present invention can be recycled as a soil improver that can improve the strength by neutralizing acidic soils and increasing the porosity by using a specially prepared treatment (sludge) generated during the purification or sewage treatment process. The present invention relates to a sludge treatment method for treating a wastewater.

정수장이나 하수종말처리장에서는 통상 원수의 전처리단계로서 화학적 침전공정과 물리적 여과공정을 수행하게 되며, 이 과정에서 침전물, 즉 슬러지가 다량 발생된다. 더욱이 산업의 발달과 더불어 공장폐수와 생활하수가 늘어남에 따라 슬러지 발생량도 크게 증가하고 있어, 그 처리에 막대한 비용이 소요되어 경제적 손실이 크다. 뿐만 아니라 슬러지는 일반적으로 매립·소각·해양투기의 방법으로 처리되어 왔는데, 슬러지에 함유된 다량의 중금속(납,카드늄,구리,크롬,비소,수은 등)이 그대로 노출됨으로써 환경을 오염시키는 원인이 되고 있다. 즉, 슬러지를 그대로 육지에 매립하면, 심한 악취와 함께 토양은 물론 침출수에 의해 하천이 오염되고 있고, 소각할 경우 다이옥신 등의 배출로 심각한 대기오염이 유발되고 있으며, 해양투기에 의해 해수의 생태계가 파괴시키는 등 그 처리에 있어서의 문제의 심각성이 더해가고 있는 실정이다.In a water treatment plant or sewage treatment plant, a chemical precipitation process and a physical filtration process are usually performed as a pretreatment step of raw water, in which a large amount of sediment, that is, sludge is generated. Moreover, with the development of the industry, the amount of sludge has increased greatly with the increase of factory wastewater and domestic sewage. In addition, sludge has been generally treated by landfilling, incineration, or ocean dumping, and the large amounts of heavy metals (lead, cadmium, copper, chromium, arsenic, mercury, etc.) contained in the sludge are exposed to raw materials. It is becoming. In other words, when landfilled sludge on land, streams are contaminated by leachate as well as soil with severe odor, and when incinerated, serious air pollution is caused by emission of dioxins, etc. It is the situation that the seriousness of the problem in the processing, such as destroying, is increasing.

슬러지에는 또한 상기한 중금속 외에도 식물 재배에 유용한 비료성분(질소·인산·칼리)도 다량 함유하는 것으로 알려져 있다. 따라서 종래에도 슬러지를 투기하지 않고 비료화하는 등의 재활용 방안이 다각적으로 연구되어 왔으며, 그 예로서, 공개특허공보 공개번호 1999-46803에 의해 슬러지를 중금속이 제거한 무기질 비료로 제조하는 방법이 알려진 바 있다. 이 방법에서는 강한 1가의 산성용액인 염산으로 슬러지를 산처리하고 이를 침전조에 정치시켜 침전분리 및 여과하여 1차적으로 중금속을 제거한 다음, 산처리된 슬러지에 알칼리성 물질인 석회유로 그 페하(pH)를 조절하고 이를 수열반응기에서 열처리 및 여과함으로써 2차적으로 중금속을 제거하여 무기질 비료를 얻는 것이다.The sludge is also known to contain a large amount of fertilizers (nitrogen, phosphoric acid and calories) useful for plant cultivation in addition to the heavy metals mentioned above. Therefore, in the prior art, recycling methods such as fertilization without sludge have been studied in various ways. As an example, a method of preparing sludge from inorganic fertilizers from which heavy metals have been removed has been known by publication No. 1999-46803. . In this method, the sludge is acidified with hydrochloric acid, a strong monovalent acidic solution, and it is allowed to stand in a sedimentation tank. The precipitate is separated and filtered to remove heavy metals first, and then the pH is removed from the acid-treated sludge with an alkaline substance, lime oil. By adjusting and heat-treating and filtering in a hydrothermal reactor, secondary metals are removed to obtain inorganic fertilizers.

그러나 이와같은 방법에 의하면, 첫째 공정이 복잡하여 처리비용 및 설비비 부담이 크므로 비경제적이고, 둘째로 슬러지의 성분에 따라 염산 및 석회유의 사용량을 조절하여야 하는 등 각 공정의 조건이 까다로와 효과적인 중금속 제거가 어려우며, 셋째로 열처리온도가 비교적 높아서 유해가스가 발생되어 대기를 오염시킴은 물론, 자연 생태계의 중요 요소가 되는 미생물마저 제거되며, 넷째로 염분이 높은 슬러지의 비료화가 곤란한 등 그 처리능력에 한계가 있다.However, according to this method, the first process is complicated, and the processing cost and equipment cost burden is large, which is uneconomical. Second, the amount of hydrochloric acid and lime oil must be adjusted according to the composition of the sludge. It is difficult to remove, and thirdly, the heat treatment temperature is relatively high, and harmful gas is generated to pollute the air, and even microorganisms that are important elements of natural ecosystem are removed. Fourth, it is difficult to fertilize sludge with high salt content. There is a limit.

한편, 이밖에도 종래에 다양한 방법이 소개된 바 있으나 대부분 중금속 및 염분을 고려하지 않은 것들이어서 그 실효성이 없고, 특히 고온의 열처리 공정을 포함하고 있어서 그 처리과정에서 유해 가스 등 또다른 오염물질을 배출하는 문제점이 지적되어 왔다.On the other hand, various methods have been introduced in the past, but most of them do not take into account heavy metals and salts, and thus are not effective, and include a high-temperature heat treatment process to discharge other pollutants such as harmful gases during the treatment. Problems have been pointed out.

따라서 본 발명의 목적은 슬러지를 처리함에 있어서 슬러지 성분중 환경오염 물질인 중금속과 악취를 제거하되 비료 성분과 생태계 보전에 필요한 미생물을 유지시키고 지력을 향상시킬 수 있는 미네랄 성분이 보강된 토양개량제로 재활용할 수 있는 슬러지 처리방법을 제공하는데 있다.Accordingly, an object of the present invention is to remove heavy metals and odors, which are environmental pollutants among sludge components, but to recycle fertilizers and mineral reinforcements to enhance minerals to maintain microorganisms necessary for the preservation of ecosystems. The present invention provides a method for treating sludge.

또한 본 발명의 목적은 슬러지 처리공정을 단순화하여 경제성을 높이는 동시에 처리결과에 대한 신뢰성을 높이고, 특히 유해가스 등의 2차 오염물질을 발생시키지 아니하는 새로운 슬러지 처리방법을 제공하는데 있다.It is also an object of the present invention to simplify the sludge treatment process to increase the economic efficiency and to improve the reliability of the treatment results, in particular to provide a new sludge treatment method that does not generate secondary pollutants such as harmful gases.

도 1은 본 발명에 따른 슬러지 처리방법에 사용되는 다공질 암석분말로 되는 슬러지 처리제의 제조공정을 설명하는 흐름도.BRIEF DESCRIPTION OF THE DRAWINGS The flowchart explaining the manufacturing process of the sludge treatment agent which becomes a porous rock powder used for the sludge treatment method which concerns on this invention.

도 2는 본 발명에 따른 슬러지 처리방법을 설명하는 흐름도.2 is a flow chart illustrating a sludge treatment method according to the present invention.

상기 목적들을 달성하기 위하여 본 발명은, 여러 가지 다공질 암석을 분말상태로 파쇄하고 이를 열처리한 후 다시 파쇄하여 소정의 슬러지 처리제를 제조하고, 그 제조된 슬러지 처리제를 슬러지와 혼합 및 교반하여 상온의 분위기에서 반응시킨 다음 건조 및 입상으로 파쇄하여 토양개량제로 재활용토록 하는 슬러지 처리방법을 창안하였다.In order to achieve the above objects, the present invention, by crushing a variety of porous rocks in the powder state and heat treatment and then crushed again to produce a predetermined sludge treatment agent, and mixed and stirred the sludge treatment agent prepared with the sludge at room temperature The sludge treatment method was made to be recycled as a soil improver after being reacted with and dried and crushed into granules.

이와같은 본 발명에 따른 슬러지 처리방법에 의하면, 정수장 및 하수종말처리장에서 배출되는 슬러지를 저렴한 비용으로 처리할 수 있을 뿐 아니라, 그 처리된 슬러지를 토양개량제로 재활용할 수 있어서 경제적 효과가 기대되는 것인 바, 그 바람직한 실시예를 설명하면 다음과 같다.According to the sludge treatment method according to the present invention, the sludge discharged from the water purification plant and sewage treatment plant can be treated at low cost, and the treated sludge can be recycled as a soil improving agent so that an economic effect is expected. In the following, the preferred embodiment will be described.

먼저, 슬러지 처리에 사용되는 슬러지 처리제는 그 제조공정도가 도시된 도 1에서 보는 바와 같이, 다공질 암석으로 화강암과 퇴적암 등을 채취하는 단계(S11), 채취된 다공질 암석을 도시하지 않은 통상의 파쇄기에서 10 내지 28메쉬의 망체를 60 내지 98％ 이상 통과할 수 있는 입경으로 1차 파쇄하는 단계(S12), 1차 파쇄된 다공질 암석분말을 700℃이하의 온도로 열처리하는 단계(S13), 열처리된 암석분말을 역시 10 내지 28메쉬의 망체를 60 내지 98％ 이상 통과할 수 있는 입경으로 2차 파쇄하는 단계(S14), 열처리된 암석분말을 상기 1차 파쇄된 암석분말과 1:9 또는 처리할 슬러지에 따라 적정 비율로 혼합하는 단계(S15)로 제조한다.First, the sludge treatment agent used in the sludge treatment step is to collect granite and sedimentary rock as porous rock (S11), as shown in FIG. 1, in which a manufacturing process diagram is shown, in a conventional crusher not showing the collected porous rock. Primary crushing step (S12), the first crushed porous rock powder to a temperature of 700 ℃ or less (S13), heat treatment Secondly crushing the rock powder to a particle diameter that can pass 60 to 98% or more of the mesh of 10 to 28 mesh (S14), the heat treated rock powder 1: 1 or treated with the primary crushed rock powder It is prepared by the step (S15) of mixing at an appropriate ratio according to the sludge.

상기한 다공질 암석에는 석영·정장석·사장석·운모 등을 주성분으로 하는 화강암과, 탄산칼슘 성분이 물 밑에 쌓여 이루어진 퇴적암으로서의 석회암 등이 있는데, 여기에는 황토의 성분으로 되는 AL2O3를 비롯한 40여종의 광물질(mineral)이 다량 포함되어 있다. 이를 열처리하는 목적은 화강암과 퇴적암 등에 함유되어 있는 약 40여종의 광물질을 활성화시키고 또 암석 입자가 다량의 원적외선을 방사하도록 하기 위함이다.The porous rock There are quartz, orthoclase, plagioclase, granite mainly composed of mica, and, as the calcium carbonate component is composed of stacked under water sedimentary rock, limestone, which contains 40 species, including AL 2 O 3 is a component of the loess Contains large amounts of minerals. The purpose of heat treatment is to activate about 40 kinds of minerals contained in granite and sedimentary rocks, and to allow the rock particles to emit a large amount of far infrared rays.

다음, 상기와 같이 제조된 슬러지 처리제로 슬러지를 처리하는 단계는, 그 공정이 도시된 도 2와 같이, 각 처의 정수장 또는 하수종말처리장에서 수거한 슬러지에 상기 제조된 슬러지 처리제를 대략 같은 비율(1:1)로 투입하여 혼합 및 회전교반하는 단계(S21), 슬러지 처리제가 혼합된 슬러지를 약 30℃ 이하의 분위기로 유지되는 반응조에서 약 24시간 내지 48시간 반응시키는 단계(S22), 반응처리된 슬러지 처리물을 그 상온 분위기에서 통풍시켜 수분함량 20％ 이하로 건조시키는 단계(S23), 건조처리된 슬러지 처리물을 10 내지 28메쉬의 망체를 60 내지 98％ 이상 통과시킬 수 있는 입경으로 분쇄하는 단계(S24)를 포함한다.Next, the step of treating the sludge with the sludge treatment agent prepared as described above, the sludge treatment agent prepared in the sludge collected in the water treatment plant or sewage terminal treatment plant of each place, as shown in FIG. 1: 1) mixing and rotating stirring (S21), reacting the sludge mixed with the sludge treatment agent in a reaction tank maintained in an atmosphere of about 30 ℃ or less for about 24 hours to 48 hours (S22), reaction treatment The sludge treated material is ventilated in a room temperature atmosphere and dried to a moisture content of 20% or less (S23), and the dried sludge treated material is pulverized into a particle diameter capable of passing 60 to 98% or more of 10 to 28 mesh meshes. Step S24 is included.

상기와 같이 슬러지 처리제와 슬러지를 반응시키면, 슬러지 처리제의 암석분말이 다공질이므로 강한 물리적 흡착작용으로 슬러지중의 중금속 및 염분을 용이하게 포착할 수 있으며, 포착된 중금속 중금속 및 염분은 또한 슬러지 처리제의 활성화된 40여종의 광물질과 화학적 이온중화반응으로 중화, 제거되어진다. 이러한 반응을 30℃ 이하의 온도조건으로 진행시키면 그 반응이 진행되는 과정에서도 슬러지에 있는 유익한 미생물을 잘 보전할 수 있다. 한편, 다공질 암석분말의 강한 물리적 흡착작용과 함께 각 암석입자로부터 다량 방사되는 원적외선의 살균 및 해취작용으로 슬러지중의 악취 및 세균이 효과적으로 제거된다.When the sludge treatment agent reacts with the sludge as described above, since the rock powder of the sludge treatment agent is porous, it is possible to easily capture heavy metals and salts in the sludge by strong physical adsorption, and the trapped heavy metal heavy metals and salts also activate the sludge treatment agent. It is neutralized and removed by about 40 kinds of minerals and chemical ion neutralization reaction. If the reaction is carried out at a temperature of 30 ℃ or less, it is possible to preserve the beneficial microorganisms in the sludge even in the course of the reaction. On the other hand, sterilization and deodorization of far infrared rays radiated from each rock particle with strong physical adsorption action of porous rock powder effectively removes odors and bacteria in sludge.

상기와 같이 실시하여 얻어진 토양개량제에는 중금속과 염분이 거의 측정되지 않았으며, 악취도 불쾌감을 느끼지 못하는 정도로 제거되었다. 반면에 식물생장에 유익한 비료 요소와 다수종의 광물질 및 유익한 미생물은 잘 보존되어 있었다. 또한 산성토양은 약알칼리성으로 중화되었으며, 공극률이 높아서 식물재배에 좋은 지력을 향상시키는데 효과가 있었다.In the soil improving agent obtained as described above, heavy metals and salinity were hardly measured, and the odor was removed to the extent that it did not feel unpleasant. On the other hand, fertilizer components and many species of minerals and beneficial microorganisms beneficial to plant growth were well preserved. In addition, acid soils were neutralized with weak alkalinity, and high porosity was effective in improving good intellect for plant cultivation.

실질적으로 본 발명에 따른 토양개량제를 배추밭에 살포하여 개량하고 배추를 재배해 본 결과 배추의 생장상태가 일반 토양에서 재배한 경우에 비하여 약 1.5배로 자라고 있음을 확인할 수 있었다.Subsequently, the soil improver according to the present invention was improved by spraying on the cabbage field, and the results of cultivation of cabbage showed that the growth state of the cabbage was about 1.5 times larger than when grown in normal soil.

이상에 설명된 바와 같이 본 발명은 다공질 및/또는 혈암을 주원료로 하고 이를 황산으로 처리한 슬러지 처리제를 개발하고 이를 이용하여 슬러지를 비료나 토양개량제로 재활용하도록 처리하는 방법을 제공하는 것이다.As described above, the present invention is to develop a sludge treatment agent treated with sulfuric acid as a main raw material and / or shale and to provide a method for treating the sludge with fertilizer or soil improving agent using the same.

본 발명에 따르면, 다공질 및/또는 혈암의 물리화학적 작용을 이용하므로 상기한 슬러지 처리제를 슬러지에 혼합 및 교반하고 상온에서 반응시키는 간단한 공정만으로도 중금속과 염분을 효과적으로 제거하는 한편, 원적외선 효과로 각종 병원균을 없애고 악취를 제거한다. 따라서 공정이 단순하여 처리능력이 크고, 시설부담이 적어 매우 경제적인 효과를 제공하며, 특히 그 처리과정에서 2차적인 오염물질을 발생시키지 아니하여 바람직한 발명이 될 것이다.According to the present invention, the physicochemical action of the porous and / or shale is used to effectively remove heavy metals and salts by simply mixing and stirring the sludge treatment agent with sludge and reacting at room temperature. Eliminate odors Therefore, the process is simple, the treatment capacity is large, and the burden on the facility is very economical, and it will be a preferred invention without generating secondary pollutants in the process.

Claims (7)

다공질 암석을 1차 파쇄하고 파쇄된 암석분말이 함유하는 광물질들을 활성화시키고 원적외선이 방사되도록 그 파쇄된 암석분말을 열처리한 후 2차 파쇄하여 되는 슬러지 처리제를 제조하는 단계와, 슬러지 처리제를 슬러지와 혼합 및 교반하여 상온의 분위기에서 반응처리하는 단계와, 반응처리된 슬러지 처리물을 건조시켜서 입상으로 분쇄처리하는 단계를 포함하는 슬러지 처리방법.Firstly crushing the porous rock, activating the minerals contained in the crushed rock powder, heat-treating the crushed rock powder to emit far infrared rays, and then preparing the sludge treatment agent which is secondly crushed, and mixing the sludge treatment agent with sludge. And a step of reacting the reaction in an atmosphere of room temperature by stirring, and drying the reacted sludge treatment to grind it into granules. 청구항 1에 있어서, 상기 다공질 암석의 1차 및 2차 파쇄와 상기 슬러지 처리물의 분쇄단계에서 각각을 10 내지 28메쉬의 망체를 60 내지 98％이상 통과할 수 있는 입경으로 파쇄 및 분쇄하는 것을 특징으로 하는 슬러지 처리방법.The method of claim 1, wherein in the primary and secondary crushing of the porous rock and the crushing step of the sludge treatment, each of the crushed and crushed to a particle diameter that can pass 60 to 98% or more of the 10 to 28 mesh mesh Sludge treatment method. 청구항 1에 있어서, 상기 1차 파쇄한 암석분말의 약 700℃ 이하의 온도로 열처리하는 것을 특징으로 하는 슬러지 처리방법.The sludge treatment method of claim 1, wherein the first crushed rock powder is heat-treated at a temperature of about 700 ° C or less. 청구항 1에 있어서, 상기 2차 파쇄하여 되는 슬러지 처리제에 상기 1차 파쇄된 암석분말을 혼합하는 단계가 더 포함된 슬러지 처리방법.The sludge treatment method of claim 1, further comprising mixing the first crushed rock powder with the second crushed sludge treatment agent. 청구항 3에 있어서, 상기 슬러지 처리제와 상기 1차 파쇄된 암석분말을 약 1:9의 비율로 혼합하는 것을 특징으로 하는 슬러지 처리방법.The method of claim 3, wherein the sludge treatment agent and the primary crushed rock powder is mixed in a ratio of about 1: 9. 청구항 1에 있어서, 상기 슬러지 처리제가 혼합된 슬러지를 30℃ 이하의 온도 분위기에서 반응시키는 것을 특징으로 하는 슬러지 처리방법.The sludge treatment method according to claim 1, wherein the sludge mixed with the sludge treatment agent is reacted in a temperature atmosphere of 30 ° C or lower. 청구항 1에 있어서, 상기 슬러지 처리제와 슬러지를 같은 비율로 혼합하는 것을 특징으로 하는 슬러지 처리방법.The sludge treatment method according to claim 1, wherein the sludge treatment agent and the sludge are mixed in the same ratio.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020067077A (en) * 2001-02-15 2002-08-22 김영술 Organic mineral composition prepared from sewage sludge and its preparing method
KR20020096033A (en) * 2002-11-01 2002-12-28 정흥제 a soil conditioner
WO2021030886A1 (en) * 2019-08-16 2021-02-25 Alfa Residuos Eireli Granulated water treatment plant sludge composition containing mineral additives and respective preparation process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020067077A (en) * 2001-02-15 2002-08-22 김영술 Organic mineral composition prepared from sewage sludge and its preparing method
KR20020096033A (en) * 2002-11-01 2002-12-28 정흥제 a soil conditioner
WO2021030886A1 (en) * 2019-08-16 2021-02-25 Alfa Residuos Eireli Granulated water treatment plant sludge composition containing mineral additives and respective preparation process

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