JPH0364199B2 - - Google Patents
Info
- Publication number
- JPH0364199B2 JPH0364199B2 JP58091740A JP9174083A JPH0364199B2 JP H0364199 B2 JPH0364199 B2 JP H0364199B2 JP 58091740 A JP58091740 A JP 58091740A JP 9174083 A JP9174083 A JP 9174083A JP H0364199 B2 JPH0364199 B2 JP H0364199B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- cake
- powder
- limestone
- caco
- 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 - Lifetime
Links
Landscapes
- Treatment Of Sludge (AREA)
Description
［発明の利用分野］
本発明は、汚泥の処理方法に関するものであ
る。更に詳しくは、石灰石（CaCO3）粉末を使
用する汚泥の処理方法に関するものである。
［従来の技術］
上水道や工業用水道の浄水場においては、硫酸
アルミニウムや塩化アルミニウムなどを用いて原
水を凝集沈殿処理する際に発生する汚泥は、適当
な手段により脱水されてケーキにされているのが
一般的である。
そして、前記脱水においては、その前工程で、
脱水助剤である消石灰（Ca（OH）2）を添加して
濾過脱水することが最も広く実施されている。
［発明が解決しようとする課題］
ところが、この消石灰法は、ケーキがアルカリ
域のものになつているので、埋立等に処分するに
際し、公害上好ましくなかつた。
そこで、これを解決する為に、石灰石
（CaCO3）粉末を用いて中性域のケーキを得るこ
とが検討されるようになつたが、この石灰石
（CaCO3）粉末法においても、ケーキの含水率及
び濾過速度が十分でなく、この点の改善の余地が
あつた。
本発明はこのようなことに着目し、これを解決
すべく各方面から鋭意検討の結果、石灰石
（CaCO3）粉末を添加混合した汚泥が中性域に変
化してしまわないうち、すなわち、PHが4.5〜５
の酸性域に保たれているうちに濾過脱水すること
により、ケーキの含水率を一段と低下せしめるこ
とができると共にその濾過速度をより速くし得る
ことを見出したのである。
［課題を解決するための手段］
すなわち、本発明に係る汚泥の処理方法は、PH
が酸性域の汚泥に石灰石粉末を添加混合した後、
濾過脱水する汚泥の処理方法において、前記石灰
石粉末を添加混合した汚泥のPHが4.5〜５に保た
れているうちに濾過脱水することを特徴とするも
のである。
［実施例］
第１図のフローシートにおいて、原水１は、凝
集槽２へ送られると共にここで硫酸バンド３が添
加混合されて凝集処理される。
次いで、この凝集処理水は、沈澱槽４へ送られ
て固液分離され、その汚泥５は、酸処理槽６へ送
られると共にその上澄水７は、濾過などの後処理
工程８へ送られて所定水質に処理された後、工場
や家庭へ送られる。
なお、酸処理槽６へ送られた浄水汚泥５は、こ
こで硫酸９が添加混合されてPHが１〜３に調整さ
れ、そして、沈澱濃縮槽１０へ送られて固液分離
され、その濃縮された汚泥１１は、脱水助剤添加
槽１２へ送られて石灰石（CaCO3）粉末１３と
撹拌混合され、更に、脱水工程１４へ送られてケ
ーキにされる。なお、沈殿濃縮槽１０から排出さ
れる上澄水１５は再生硫酸バンドとして元へ戻さ
れる。
本発明は、上述したような浄水処理において、
石灰石（CaCO3）粉末１３が添加混合された汚
泥１６のPHが酸性域から中性域へ変化してしまわ
ないうち、すなわち、PHが4.5〜５に保たれてい
るうちに、速やかに脱水工程１４へ送つて濾過脱
水する。
而して、石灰石（CaCO3）粉末１３を添加混
合して中性域へPHを変化させた後で、濾過脱水す
る場合に比して、ケーキの含水率を一段と小さく
することができると共にその濾過速度をより大き
くすることができる。なお、得られるケーキのPH
は、脱水処理直後では酸性域のものになつている
が、数時間経過すると、中性域のものに変化す
る。これは、ケーキの汚泥中に含まれている未反
応の石灰石（CaCO3）粉末成分と酸性水分との
中和反応が進行する為である。従つて、得られる
ケーキを放置することにより、無害な中性域のケ
ーキにすることができる。
表１において本発明の実施例で得られたケーキ
の含水率及びその濾過速度等を示すと共に表２、
３において比較例で得られたそれらを示す。な
お、これらの実施例及び比較例においては、真空
式濾過脱水テスト器を用いた。
[Field of Application of the Invention] The present invention relates to a method for treating sludge. More specifically, the present invention relates to a method for treating sludge using limestone (CaCO 3 ) powder. [Prior art] In water treatment plants for waterworks and industrial water supplies, the sludge generated when raw water is coagulated and sedimented using aluminum sulfate, aluminum chloride, etc. is dehydrated and turned into a cake by appropriate means. is common. In the dehydration, in the previous step,
The most widely used method is to add slaked lime (Ca(OH) 2 ), which is a dehydration aid, to filtration and dehydration. [Problems to be Solved by the Invention] However, in this slaked lime method, the cake is in the alkaline range, so it is not preferable in terms of pollution when disposed of in a landfill or the like. Therefore, in order to solve this problem, it has been considered to use limestone (CaCO 3 ) powder to obtain a cake in the neutral range. The efficiency and filtration rate were not sufficient, and there was room for improvement in this respect. The present invention focused on such a problem, and as a result of intensive studies from various aspects in order to solve this problem, it was found that the sludge mixed with limestone (CaCO 3 ) powder changes to a neutral range, that is, the PH is 4.5~5
They discovered that by filtering and dehydrating the cake while it is maintained in the acidic range, it is possible to further reduce the moisture content of the cake and to increase the filtration rate. [Means for solving the problem] That is, the sludge treatment method according to the present invention
After adding and mixing limestone powder to the sludge in the acidic region,
The method for treating sludge by filtering and dewatering is characterized in that the sludge mixed with the limestone powder is filtered and dehydrated while the pH of the sludge is maintained at 4.5 to 5. [Example] In the flow sheet of FIG. 1, raw water 1 is sent to a flocculation tank 2, where sulfuric acid bandate 3 is added and mixed and subjected to flocculation treatment. Next, this flocculation treated water is sent to a settling tank 4 for solid-liquid separation, the sludge 5 is sent to an acid treatment tank 6, and the supernatant water 7 is sent to a post-treatment process 8 such as filtration. After the water is treated to a specified quality, it is sent to factories and homes. The purified water sludge 5 sent to the acid treatment tank 6 is mixed with sulfuric acid 9 to adjust the pH to 1 to 3, and then sent to the sedimentation and concentration tank 10 for solid-liquid separation and its concentration. The sludge 11 thus obtained is sent to a dehydration aid addition tank 12 where it is stirred and mixed with limestone (CaCO 3 ) powder 13, and further sent to a dewatering step 14 where it is made into a cake. Note that the supernatant water 15 discharged from the precipitation concentration tank 10 is returned to the original state as regenerated sulfuric acid band. The present invention provides water purification treatment as described above.
The dewatering process is carried out immediately before the pH of the sludge 16 to which limestone (CaCO 3 ) powder 13 is added and mixed changes from the acidic range to the neutral range, that is, while the pH is maintained at 4.5 to 5. 14 for filtration and dehydration. Therefore, compared to the case where limestone (CaCO 3 ) powder 13 is added and mixed to change the pH to a neutral range and then filtered and dehydrated, the moisture content of the cake can be further reduced and the moisture content of the cake can be further reduced. Filtration rates can be increased. In addition, the PH of the cake obtained
Immediately after dehydration, it is in the acidic range, but after a few hours, it changes to the neutral range. This is because the neutralization reaction between unreacted limestone (CaCO 3 ) powder components contained in the cake sludge and acidic water progresses. Therefore, by allowing the resulting cake to stand, it can be turned into a harmless neutral cake. Table 1 shows the moisture content of the cake obtained in the example of the present invention and its filtration rate, etc., and Table 2,
3 shows those obtained in a comparative example. In addition, in these Examples and Comparative Examples, a vacuum filtration and dehydration tester was used.
【表】【table】
【表】【table】
【表】【table】
【表】
これらの表において、石灰石（CaCO3）粉末
を添加し酸性域の汚泥を濾過脱水する実施例Ａ、
Ｂと、石灰石（CaCO3）粉末を添加し中性域の
汚泥を濾過脱水する比較例Ｂとを対比してみた場
合、ケーキの含水率が、実施例Ａ、Ｂの方が一段
と低率であると共に濾過速度も約２倍であるか
ら、実施例Ａ、Ｂの方が有利であることがわか
る。
また、いずれも石灰石（CaCO3）粉末を添加
し酸性域で濾過脱水するが、PHが4.6及び4.8の汚
泥を脱水する実施例Ａ、Ｂと、PHが3.0の汚泥を
脱水する比較例Ｄとを対比してみた場合、両者
は、濾過速度においては差異がなくても、ケーキ
の含水率が、実施例Ａ、Ｂのケーキ含水率の方が
低率であるから、実施例Ａ、Ｂの方が有利である
ことがわかる。
更に、石灰石（CaCO3）粉末を添加し酸性域
の汚泥を濾過脱水する実施例Ａ、Ｂと、消石灰
（Ca（OH）2）を添加する比較例Ａ、Ｃと対比して
みた場合、ケーキの含水率が、実施例Ａ、Ｂの方
が一段と低率であると共に濾過速度も大きいか
ら、実施例Ａ、Ｂの方が有利であることがわか
る。
［発明の効果］
上述の如く、本発明によると、消石灰（Ca
（OH）2）粉末を用いる等の従来方法に比して、
より迅速に濾過脱水し得ると共に含水率が一段と
低率のケーキを得ることができ、しかも、放置に
より無害な中性域のケーキにすることができる汚
泥の処理方法が得られる。[Table] In these tables, Example A in which limestone (CaCO 3 ) powder is added and sludge in an acidic region is filtered and dehydrated;
When Comparative Example B is compared with Comparative Example B in which limestone (CaCO 3 ) powder is added and sludge in the neutral range is filtered and dehydrated, the moisture content of the cake is much lower in Examples A and B. It can be seen that Examples A and B are more advantageous because the filtration rate is also about twice as high. In addition, limestone (CaCO 3 ) powder is added and filtration and dehydration are carried out in an acidic range in both cases, but Examples A and B dehydrate sludge with a pH of 4.6 and 4.8, and Comparative Example D dehydrates sludge with a pH of 3.0. When compared, even though there is no difference in filtration rate, the cake moisture content of Examples A and B is lower than that of Examples A and B. It turns out that it is more advantageous. Furthermore, when comparing Examples A and B in which limestone (CaCO 3 ) powder was added to filter and dehydrate sludge in an acidic region, and Comparative Examples A and C in which slaked lime (Ca(OH) 2 ) was added, cake It can be seen that Examples A and B are more advantageous because the water content in Examples A and B is much lower and the filtration rate is also higher. [Effect of the invention] As described above, according to the present invention, slaked lime (Ca
(OH) 2 ) Compared to conventional methods such as using powder,
A method for treating sludge that can be filtered and dehydrated more quickly, yield a cake with a lower water content, and can be left to stand to form a harmless cake in the neutral range.
第１図は浄水処理のフローシート図である。
２……凝集層、３……硫酸バンド、４……沈澱
槽、６……酸処理槽、１０……沈殿濃縮槽、１１
……PHが酸性域の汚泥、１２……脱水助剤添加
槽、１３……石灰石粉末、１４……脱水工程。
FIG. 1 is a flow sheet diagram of water purification treatment. 2... Agglomeration layer, 3... Sulfuric acid band, 4... Sedimentation tank, 6... Acid treatment tank, 10... Precipitation concentration tank, 11
...Sludge with pH in the acidic range, 12 ... Dehydration aid addition tank, 13 ... Limestone powder, 14 ... Dewatering process.
Claims (1)
た後、濾過脱水する汚泥の処理方法において、前
記石灰石粉末を添加混合した汚泥のPHが4.5〜５
に保たれているうちに濾過脱水することを特徴と
する汚泥の処理方法。1. In a sludge treatment method in which limestone powder is added and mixed to sludge in an acidic pH range, and then filtered and dehydrated, the pH of the sludge to which the limestone powder is added and mixed is 4.5 to 5.
A sludge treatment method characterized by filtering and dewatering sludge while the sludge is being maintained at
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58091740A JPS59216700A (en) | 1983-05-24 | 1983-05-24 | Sludge treating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58091740A JPS59216700A (en) | 1983-05-24 | 1983-05-24 | Sludge treating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59216700A JPS59216700A (en) | 1984-12-06 |
| JPH0364199B2 true JPH0364199B2 (en) | 1991-10-04 |
Family
ID=14034913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58091740A Granted JPS59216700A (en) | 1983-05-24 | 1983-05-24 | Sludge treating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59216700A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062891C (en) * | 1998-02-13 | 2001-03-07 | 陈钦道 | Simple method for treating acid residuals of petroleum |
| ES2157752B1 (en) * | 1998-12-22 | 2002-03-01 | Gen Aguas De Barcelona S A Soc | PROCEDURE FOR OBTAINING A PULVERULENT PRODUCT FROM THE REJECTION FRACTION OF A WATER POTABILIZING PLANT, PRODUCT OBTAINED WITH SUCH PROCEDURE AND USE OF SUCH PRODUCT. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5310392A (en) * | 1976-07-16 | 1978-01-30 | Mitsubishi Electric Corp | Controller for ozone yield |
-
1983
- 1983-05-24 JP JP58091740A patent/JPS59216700A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59216700A (en) | 1984-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101891330B (en) | Power plant wastewater treatment system and method | |
| KR100313221B1 (en) | Treatment of flue gas desulfurization drainage | |
| CN112850867B (en) | Deep defluorination medicament and preparation method thereof | |
| JPH0576876A (en) | Method for treating wastewater containing fluorine and manganese | |
| CN115893540A (en) | Water purifying agent for chemical organic wastewater treatment and preparation method thereof | |
| JPH0364199B2 (en) | ||
| JP3709156B2 (en) | Treatment method for fluorine-containing wastewater | |
| JPS61227840A (en) | Preparation of inorganic adsorbent using sludge of water purifying plant as raw material | |
| RU2054315C1 (en) | Method for production of sorbent for sewage from organic substances | |
| JP2991588B2 (en) | Method for dewatering sludge containing calcium compound | |
| JPH0122840B2 (en) | ||
| JPH0880488A (en) | Complete treatment of organic sewage | |
| JP3487488B2 (en) | Sewage treatment method | |
| JP3593726B2 (en) | Method for treating wastewater containing sulfuric acid and copper | |
| SU861452A1 (en) | Method of processing paper production aqueous-fibrous waste | |
| SU791650A1 (en) | Method of treatment of waste water precipitate | |
| JPH0929266A (en) | Copper containing water treatment method | |
| JPS6061013A (en) | Solid/liquid separating apparatus | |
| JPH06191852A (en) | Production of inorganic pigment from waste water sludge | |
| SU1692940A1 (en) | Method of producing magnesium hydroxide | |
| JPH05269473A (en) | Wastewater treatment method for waste gas treatment equipment for optical fiber preform manufacturing equipment | |
| SU1186582A1 (en) | Method of processing waste water sediment | |
| JP4640149B2 (en) | Fluorine-containing water treatment method | |
| JPS5837040B2 (en) | Sludge dewatering method | |
| JPS594499A (en) | Treatment of sludge |