JPS5858486B2 - How to dispose of sludge - Google Patents
How to dispose of sludgeInfo
- Publication number
- JPS5858486B2 JPS5858486B2 JP52069240A JP6924077A JPS5858486B2 JP S5858486 B2 JPS5858486 B2 JP S5858486B2 JP 52069240 A JP52069240 A JP 52069240A JP 6924077 A JP6924077 A JP 6924077A JP S5858486 B2 JPS5858486 B2 JP S5858486B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- salt
- sodium silicate
- sulfuric acid
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Treatment Of Sludge (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【発明の詳細な説明】
本発明はヘドロの処理方法に関し、その目的はヘドロ凝
固物による二次公害の発生を防止すると同時に処理コス
トの低減を図ることにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating sludge, and its purpose is to prevent secondary pollution caused by coagulated sludge and at the same time to reduce treatment costs.
従来、ヘドロ処理には、ヘドロに対して高分子凝集剤を
添加して金泥率を上げ、これを貯泥池へ揚泥していた。Conventionally, sludge treatment involves adding a polymer flocculant to the sludge to increase the percentage of gold slurry, and then pumping the sludge into a sludge storage pond.
しかしこの方法ではヘドロから水分が抜けるのに相当の
日数を要し、降雨や台風などによって放出することがあ
った。However, with this method, it takes a considerable number of days for the water to drain from the sludge, and it can be released by rain or typhoons.
曾た今日ヘドロには海底、湖、沼等のものを問わず重金
属が含有されていることが多く、２次公害防止の必要性
も高い。Nowadays, sludge, whether it comes from the ocean floor, lakes, or marshes, often contains heavy metals, and there is a strong need to prevent secondary pollution.
本発明はこのような従来方法の欠点を完全に解消すると
同時に処理コストも低減し得る処理方法に係るものであ
って、ヘドロに対して硅酸ソーダ、塩及び硫酸を加えて
凝固させることを特徴とするものである。The present invention relates to a treatment method that can completely eliminate the drawbacks of such conventional methods and at the same time reduce treatment costs, and is characterized by adding sodium silicate, salt, and sulfuric acid to the sludge to solidify it. That is.
本発明によると、海水ヘドロの場合、塩Ｃｔ濃度をたと
えば５０００ｐｐｍ以上に設定し、このヘドロに対して
硅酸ソーダを加え、充分に撹拌したのちに中和のための
硫酸を加えると、前記ヘドロは凝固する。According to the present invention, in the case of seawater sludge, when the salt Ct concentration is set to, for example, 5000 ppm or more, sodium silicate is added to the sludge, and after sufficient stirring, sulfuric acid is added for neutralization, the sludge is solidifies.
凝固後は分子内部における加橋反応により、体積の縮少
及び重金属の流出防止のための反応が平行して進行する
。After solidification, a cross-linking reaction within the molecule progresses in parallel to reduce the volume and prevent heavy metals from flowing out.
この場合、凝固したものは天日乾燥しても良いし、加圧
脱水或は機械脱水しても良い。In this case, the solidified product may be dried in the sun, or may be dehydrated under pressure or mechanically.
これら凝固した物質は再び泥質化することがないため、
埋立用土砂、土盛用、セメント内に入れる骨材用として
利用できる。These solidified substances will not become muddy again, so
It can be used as soil for landfill, earth embankment, and aggregate for cement.
次に本発明方法を海底に堆積している海水ヘドロ及び湖
、沼等の淡水へト狛に対して適用した場合の実験例を示
す。Next, an experimental example will be shown in which the method of the present invention is applied to seawater sludge deposited on the seabed and freshwater sludge from lakes, marshes, etc.
実験例 １
実験条件
海水ヘト０ １００ｃｃ（比重１．１５）塩（ＮａＣ１
）濃度 ３％（２０００ｐｐｍ）硅酸ソーダ（例、ＪＩ
８３号） ５ｃｃ硫 酸 ０
．５ ｃｃヘドロ内の重金属含有量
Ｔｏ ｔａ ｌ −Ｈｇ ３ ｐｐｍＣｒ
５０ｐｐｍ
Ｋ ２ｐｐｍ
Ｐｂ ５ｐｐｍ
以上の条件下では、凝固は硅酸ソーダ添加後２〜３分で
開始し、２日後には離漿水を出し体積３
が詔減少し、１０日後には離漿水を出し体積が詔減少し
た。Experimental example 1 Experimental conditions Seawater Het 0 100cc (specific gravity 1.15) Salt (NaCl
) concentration 3% (2000ppm) sodium silicate (e.g. JI
No. 83) 5cc sulfuric acid 0
．． Heavy metal content in 5 cc sludgeTotal -Hg 3 ppmCr
50ppm K 2ppm Pb 5ppm Under the above conditions, coagulation starts 2 to 3 minutes after addition of sodium silicate, after 2 days, syneresis water is released and the volume 3 is decreased, and after 10 days, syneresis water is released. The output volume has been reduced.
そして離奨水中の重金属量は原子吸光によると、 Ｔｏｔａｌ−Ｈｇ 検出されず Ｃｒ 検出されず Ｋ Ｏ，０２ｐｐｍ ｐｂ 検出されず の結果を示し、離漿水ｐＨは７．７であった。According to atomic absorption, the amount of heavy metals in water is as follows: Total-Hg Not detected Cr not detected K O, 02ppm pb not detected The pH of synervic water was 7.7.
実験例 ２
実験条件
淡水ヘドロ １００ｃｃ（比重１．１０）塩濃度 ３％
硅酸ソーダ（例、ＪＩＳ３号） ６ｃｃ硫 酸
０．５５ＣＣ
以上の条件下では、凝固は硅酸ソーダ添加後３〜５分で
開始した。Experimental example 2 Experimental conditions Freshwater sludge 100cc (specific gravity 1.10) Salt concentration 3% Sodium silicate (e.g. JIS No. 3) 6cc sulfuric acid
Under conditions of 0.55 CC or higher, coagulation started 3 to 5 minutes after addition of sodium silicate.
なお凝固物質からの離奨水ｐＨは７．２〜７．５であっ
た。The pH of the water released from the coagulated material was 7.2 to 7.5.
以上のように本発明方法は海水ヘドロ、淡水ヘドロに対
して硅酸ソーダ、塩、硫酸を凝固するに最適な割合で用
いて処理することによって、速かに再泥質化しない凝固
物が得られ、離奨水にも重金属は含捷れないので２次公
害を起す心配のない凝固物を得ることができるし、この
凝固物は前記したセメントの骨材等として有効活用が可
能であるので、リサイクル物質の有効活用という点から
も有益である。As described above, in the method of the present invention, by treating seawater sludge and freshwater sludge with sodium silicate, salt, and sulfuric acid in the optimal ratio for coagulation, it is possible to obtain a coagulated material that does not quickly turn into silt. Since the separation water does not contain heavy metals, it is possible to obtain a coagulated product that does not cause secondary pollution, and this coagulated product can be effectively used as aggregate for cement as described above. It is also beneficial from the point of view of effective utilization of recycled materials.
また本発明方法において使用される塩は良質のものであ
る必要はなく、たとえばビニール焼却場等から発生する
塩Ｃｔ２ を利用することもでき、さらにこのように塩
を硅酸ソーダとともに加えることによって高価な硅酸ソ
ーダの使用量が少なくなるので処理コストを節減するこ
とができる。Furthermore, the salt used in the method of the present invention does not have to be of high quality; for example, salt Ct2 generated from vinyl incineration plants can also be used, and by adding salt together with sodium silicate, it is possible to Since the amount of sodium silicate used is reduced, processing costs can be reduced.
Claims (1)
塩分を含んだヘドロ１００ｃｃに対して珪酸ソーダ５〜
６ｃｃと硫酸０．５〜０．５５ｃｃを加えて凝固させる
ことを特徴とするヘドロの処理方法。1 Add salt so that the salt concentration of the sludge is 3%, and add 5~5~ of sodium silicate to 100cc of the sludge containing the salt.
A method for treating sludge, which comprises adding 6 cc and 0.5 to 0.55 cc of sulfuric acid to solidify it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52069240A JPS5858486B2 (en) | 1977-06-10 | 1977-06-10 | How to dispose of sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52069240A JPS5858486B2 (en) | 1977-06-10 | 1977-06-10 | How to dispose of sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS544443A JPS544443A (en) | 1979-01-13 |
| JPS5858486B2 true JPS5858486B2 (en) | 1983-12-26 |
Family
ID=13397021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52069240A Expired JPS5858486B2 (en) | 1977-06-10 | 1977-06-10 | How to dispose of sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5858486B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5631498A (en) * | 1979-08-22 | 1981-03-30 | Taisei Corp | Sludge treating method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5196113A (en) * | 1975-02-19 | 1976-08-23 |
-
1977
- 1977-06-10 JP JP52069240A patent/JPS5858486B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5196113A (en) * | 1975-02-19 | 1976-08-23 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS544443A (en) | 1979-01-13 |
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