JPS60125293A - Treatment of waste water - Google Patents

Abstract

PURPOSE:To prolong the life of soil by enhancing the dephosphorization capacity thereof, by filling the periphery of a water sprinkling pipe with soil treated with a basic aluminum salt or soil which received treatment due to an alkaline substance after the treatment of said basic aluminum salt. CONSTITUTION:0.1-5wt% of basic aluminum salt is contained in soil such as volcanic ash soil, clayey soil or sandy soil as Al2O3 and this soil is granulated to fill the periphery of a water sprinkling pipe. In order to further enhance the dephosphorization capacity of soil, after soil is treated with said basic aluminum salt, an alkali substance such as oxide, hydroxide or carbonate of an alkali metal or an alkaline earth metal is mixed with said soil. In this case, the alkali substance is pref., used so as to adjust the pH of soil after treatment to 4-8 in order to enhance dephosphorization effect.

Description

【発明の詳細な説明】 本発明は、排水の処理方法、特に排水の土壌浄化方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating wastewater, and particularly to a method for soil purification of wastewater.

近年、生活雑排水、下水処理排水等が環境汚染の原因と
して注目され、殊にりんは湖沼、河川、海等の富栄養化
問題を招来するため、幾多のりん除去研究がなされてい
る。現在、用廃水中のりん除去方法としては、凝集沈澱
法が最も広く行われ、凝集剤としては石灰、塩基性塩化
アルミニウム、硫酸アルミニウム、塩化第２鉄、活性ア
ルミナ等が使用されている。In recent years, gray water, sewage treatment wastewater, etc. have attracted attention as a cause of environmental pollution, and since phosphorus in particular causes eutrophication problems in lakes, rivers, oceans, etc., numerous studies have been conducted to remove phosphorus. Currently, the coagulation-sedimentation method is the most widely used method for removing phosphorus from industrial wastewater, and lime, basic aluminum chloride, aluminum sulfate, ferric chloride, activated alumina, etc. are used as coagulants.

しかしながら、石灰の使用は装置内に広酸力／Ｌ７　シ
ｆｉムのスケールを生成し、アルミニウム塩、鉄塩の使
用は排水中の有機物、固形物などの影響があるため理論
量より多量の使用を余儀なくされ、活性アルミナの使用
は効果に難点があるのみならず、高価となる。　また凝
集沈澱法による場合は、汚泥の分離操作を必要とし、経
済的観点からも望ましい方法とは云難い。However, the use of lime creates a scale of wide acidity/L7 sifim in the equipment, and the use of aluminum salts and iron salts has the effect of organic matter and solid matter in the wastewater, so it is necessary to use a larger amount than the theoretical amount. Therefore, the use of activated alumina not only has disadvantages in effectiveness but also is expensive. Furthermore, the coagulation-sedimentation method requires a sludge separation operation, and is therefore not a desirable method from an economical point of view.

一方、自然浄化を利用した土壌浄化法が開発され注目さ
れているが、りん除去容量が必ずしも充分でなく、また
土壌が粘質土である場合、殊に透水性が悪化し、脱りん
効果は年次と共に急激に低下し、透水性悪化と相俟って
土壌の目詰をも召来する。On the other hand, soil purification methods using natural purification have been developed and are attracting attention, but the phosphorus removal capacity is not necessarily sufficient, and when the soil is clayey, water permeability is particularly poor and the dephosphorization effect is poor. It rapidly decreases with age, and together with the deterioration of water permeability, it also causes clogging of the soil.

土壌浄化法は一般に腐敗槽や沈澱槽で処理された生活雑
排水や下水二次処理排水を、土壌中に埋設された散水管
から土壌中に浸潤、流出せしめる。一般に排水の負荷量
は、−日当り５０〜２００ω？である。散水管の敷設方
法は、通常中５０〜４０ａ１深さ６０〜７０　国程度の
浅い溝を堀った後、底部に合成樹脂シートを敷設し、シ
ート上に粗砂な５〜１０ｔＭＲ充てんし、−その上に更
に散水管を−敷きならべ、散水管の周囲を１０〜２０側
に砂利または礫で包み、ナイロンネットでこれを包みこ
んだ後、その上を土壌で被覆することにより行われる。In the soil purification method, domestic wastewater and secondary sewage treatment wastewater that has been treated in a septic tank or sedimentation tank is generally allowed to infiltrate into the soil and flow out through sprinkler pipes buried in the soil. Generally, the load amount of wastewater is -50 to 200 ohms per day? It is. The method of laying a sprinkler pipe is usually to dig a shallow trench about 50 to 40 mm deep and 60 to 70 mm deep, then lay a synthetic resin sheet at the bottom, fill the sheet with 5 to 10 tons of coarse sand, and - This is done by laying a sprinkler pipe on top of it, wrapping the periphery of the sprinkler pipe with gravel or gravel on the 10th to 20th sides, wrapping this with a nylon net, and then covering the top with soil.

本発明は最後に使用される散水管の被覆土壌及び散水管
周囲の土壌を、塩基性アルミニウム塩、具体的には塩基
性塩化アルミニウム、塩基性硫酸アルミニウムあるいは
これらの混合物で処理して、土壌の脱りん能力を向上せ
しめることによって、土壌の耐用年数を長期化せんとす
ることを目的とする。　即ち、水弟１の発明は散水管の
周囲の土壌を塩基性アルミニウム塩で処理したキ壌とす
ることからなる排水の処理方法に関し、水弟２の発明は
、塩基性アルミニウム塩で土壌を処理後、次いでアルカ
リ性物質で処理し、水弟１の発明の効果を更に高める方
法に関する。In the present invention, the covering soil of the last used watering pipe and the soil around the watering pipe are treated with basic aluminum salt, specifically basic aluminum chloride, basic aluminum sulfate, or a mixture thereof, to improve the soil quality. The purpose is to extend the useful life of soil by improving its dephosphorization ability. That is, the invention of Mizuo 1 relates to a wastewater treatment method that involves treating the soil around a watering pipe with a basic aluminum salt to form soil, and the invention of Mizuo 2 relates to a method of treating soil with a basic aluminum salt. It also relates to a method for further enhancing the effect of the invention of Suihiro 1 by treating it with an alkaline substance.

本発明の塩基性アルミニウム塩を溶液で使用するときは
、溶液の安定性及び効果の点からＡｌｔｏｓとして７〜
１２重量％の範囲カミまた塩基度としては２５〜８５％
の範囲が好ましい。When using the basic aluminum salt of the present invention in solution, from the viewpoint of solution stability and effectiveness, it is recommended to
12% by weight range and basicity 25-85%
A range of is preferred.

また、塩基性アＩレミニウム塩溶液はこれを乾燥して粉
末として使用しうろことは勿論である。It goes without saying that the basic areminium salt solution can be dried and used as a powder.

本発明に使用しうる土壌は火山灰土壌、粘土質土壌、砂
質＋壌等あらゆる土壌であって、かかる土壌に対する塩
基性アルミニウム塩の使用割合は、土壌の種類、塩基性
アルミニウム塩の塩基度、アニオンの種類によって異な
るが、概して風乾上に対し、ｈ４ｏｚとして０１〜５重
量％の範囲が好ましい。The soil that can be used in the present invention is any type of soil such as volcanic ash soil, clay soil, sandy soil, etc. The proportion of basic aluminum salt used in such soil depends on the type of soil, the basicity of the basic aluminum salt, Although it varies depending on the type of anion, a range of 01 to 5% by weight of h4oz based on air drying is generally preferable.

即ち、０１重量％以下の範囲では本発明の効果を期待す
ることができず、５重量％を上廻って使用しても添加量
に見合う効果は得られず、また土壌は固化し、散水管を
流出する排水の透水性が悪化し、脱りん効果も低下する
。In other words, the effect of the present invention cannot be expected if the amount is less than 0.01% by weight, and even if it is used in excess of 5% by weight, the effect commensurate with the amount added cannot be obtained, and the soil solidifies and the watering pipes The permeability of the wastewater that flows out deteriorates, and the dephosphorization effect also decreases.

土壌処理方法としては、被処理方法として被処理土壌に
塩基性アルミニウム塩溶液を添加混合するのみで良いが
、土壌は乾燥状態のものが望ましい。また粉末状の塩基
性アルミニウム塩を使用する場合は、若干湿潤状態のも
のであってもよい。As a soil treatment method, it is sufficient to simply add and mix a basic aluminum salt solution to the soil to be treated, but it is preferable that the soil be in a dry state. Furthermore, when using a powdered basic aluminum salt, it may be in a slightly wet state.

土壌と塩基性アルミニウム塩を良く混合し、この土壌を
散水管周囲に埋戻す。　かかる場合に於て、土壌の目詰
及び透水性の観点から処理土壌を粒状にし埋戻すことが
望ましい。Mix the soil and basic aluminum salt well and backfill the area around the water pipes with this soil. In such cases, it is desirable to granulate the treated soil and backfill it from the viewpoint of soil clogging and water permeability.

しかして、本発明の効果を更に高めるためには、土壌を
一旦塩基性アルミニウム塩で処理した後、次いでアルカ
リ性物質、例えばアルカリ金属あるいはアルカリ土類金
属の酸化物、水酸化物、炭酸塩、各種炉滓等とよく混合
する。　かかる場合に於けるアルカリ性物質の使用量は
、処理後の土壌ｐＨが４〜８になる程度に使用すること
が本発明の脱りん効果との関係に於て最も好ましい。　
この範囲を逸脱すると、効果は著しく減退する。Therefore, in order to further enhance the effects of the present invention, it is necessary to first treat the soil with a basic aluminum salt, and then treat it with alkaline substances, such as oxides, hydroxides, and carbonates of alkali metals or alkaline earth metals. Mix well with furnace slag, etc. In such a case, it is most preferable to use the alkaline substance in an amount such that the pH of the soil after treatment is 4 to 8, in view of the dephosphorization effect of the present invention.
Outside this range, the effectiveness is significantly reduced.

尚、土壌ｐＨは水１ｏｏｃｃに５１の処理土壌を添加混
合し、１０分間静置後のｐＨである。Note that the soil pH is the pH after adding and mixing the treated soil No. 51 to 1 oocc of water and allowing it to stand for 10 minutes.

以下に本発明の実施例を挙けて説明する。Examples of the present invention will be described below.

実施例１ 被処理土壌として火山灰土（りん酸吸収係数２、５００
　Ｆ＊０６　ｍｙ／１ｏｏ　ｙ　）及び沖積土壌（りん
酸吸収係数４００　ＰＩＯ５ｍＷ、Ａ　００Ｆ　）を使
用し、一方、土壌処理薬剤とし・て硫酸根含有の塩基性
塩化アルミニウム水溶液（組成Ａム０ｓ１０．３％、Ｏ
Ａ？８．６％、Ｓｏ’、　３．０％、塩基度５４４％）
及び硫酸アルミニウム水溶液（組成Ａ／？１０．７．９
％、５０４２２４％）を使用する。　風乾した被処理土
壌を篩分して、２■以下とした土壌に対し、Ａｌｓ　Ｏ
＝が所定量になるよ１うに各処理薬剤を添加混合し、更
に風乾して処理土壌とした。　各処理土壌についてりん
酸吸収係数を測定した。　その結果を第１表に示す。Example 1 Volcanic ash soil (phosphoric acid absorption coefficient 2,500
F*06 my/1oo y ) and alluvial soil (phosphate absorption coefficient 400 PIO5 mW, A 00F ) were used, while a basic aluminum chloride aqueous solution containing sulfate radicals (composition A 0s10.3) was used as a soil treatment agent. %, O
A? 8.6%, So', 3.0%, basicity 544%)
and aluminum sulfate aqueous solution (composition A/?10.7.9
%, 504224%). The air-dried soil to be treated was sieved to a concentration of 2.
Each treatment agent was added and mixed so that = 1 was the predetermined amount, and then air-dried to obtain treated soil. The phosphate absorption coefficient was measured for each treated soil. The results are shown in Table 1.

りん酸吸収係数測定法。Phosphate absorption coefficient measurement method.

加え、２時間連続的に振とうし、室温で２４時間放置し
た。　これを濾過し、ｐ液中のりん酸量を測定して、乾
±１００ｙに対するりん酸吸収量を算定し、これをりん
酸吸収係数とした。The mixture was then continuously shaken for 2 hours and left at room temperature for 24 hours. This was filtered, the amount of phosphoric acid in the p liquid was measured, and the amount of phosphoric acid absorbed per dry ±100 y was calculated, and this was taken as the phosphoric acid absorption coefficient.

明細書の浄書（内容に変更なし） 第　１　表 ※１）　りん酸吸収係数２．５００　Ｐオ０５岬／１０
０ｇ！明細書の浄書（内容に変更なし］ ※２）　りん酸吸収係数４００　ＲＱｓ　”Ｉ／　＋　
ＯＯＰ明細書の浄書′（内容に変更なし） 実施例２ 実施例１で使用した被処理火山灰土壌に水酸化カルシウ
ムを２０％添加混合して処理した土壌、塩基性塩化アル
ミニウム水溶液（組成Ａムα１０．５％、ｃｚ、＋ｏ、
ｓ％、塩基度４７７％）、硫酸アｌレミニウム水溶液（
゛組成Ａｌｔｏｓ　７．９％、ＳＯ。Engraving of the specification (no changes to the contents) Table 1 *1) Phosphoric acid absorption coefficient 2.500 PO05 Misaki/10
0g! Copy of specification (no change in content) *2) Phosphoric acid absorption coefficient 400 RQs ”I/ +
Cleaning of OOP specification (no change in content) Example 2 Soil treated by adding and mixing 20% calcium hydroxide to the volcanic ash soil to be treated used in Example 1, basic aluminum chloride aqueous solution (composition Am α10 .5%, cz, +o,
s%, basicity 477%), aluminum sulfate aqueous solution (
゛Composition Altos 7.9%, SO.

２２４％）で各々Ａｌｔｏ１２．０％になるように添加
混合して処理した土壌、及び塩基性塩化アルミニウム水
溶液及び硫酸アルミニウム水溶液を各々Ａ４ＣＬ　２．
０％になるように添加混合後、次いで水酸化カルシウム
ｚＯ％を添加混合して処理した土壌、これらの処理土壌
を風乾した後、りん酸吸収係数を測定した。　その結果
を第２表に示す。224%) and Alto 12.0%, respectively, and treated soil, and a basic aluminum chloride aqueous solution and an aluminum sulfate aqueous solution, respectively, were treated with A4CL 2.
After adding and mixing the soil to a concentration of 0% and then adding and mixing calcium hydroxide zO%, the treated soil was air-dried, and then the phosphoric acid absorption coefficient was measured. The results are shown in Table 2.

第　２　表 注）Ａ：水酸化カルシウム Ｂ：塩基性塩化アルミニウム水溶液 ｃニアｉｆＥ酸アルミニウム水溶液 ｊ２Ｎ）：処理土−ｐＨ６，５ イそ２）：処理土壌ｐＨ４，２ 」−表から明らかになるようｔこ、アルカリ性物質と塩
基性塩化アルミニウムの併用により、脱りん効果は著し
く向上し、ｐＨが矯正される。Table 2 Note) A: Calcium hydroxide B: Basic aluminum chloride aqueous solution cniaifE acid aluminum aqueous solution j2N): Treated soil - pH 6,5 Iso 2): Treated soil pH 4,2'' - As is clear from the table By using an alkaline substance and basic aluminum chloride in combination, the dephosphorization effect is significantly improved and the pH is corrected.

実施例６ 実施例１と同じ土壌に塩基性硫酸アルミニウム水溶液（
Ａ４％７．８％、塩基度４８０％）をＡ／？、Ｏ。Example 6 A basic aluminum sulfate aqueous solution (
A4%7.8%, basicity 480%) to A/? ,O.

とじて５０％の割合になるように混合した後、風乾して
処理土壌とし、実施例１と同様にりん酸吸収係数を測定
した。その結果、７，５００＃Ｐ２さ１００ノの値が得
られた。After closing and mixing at a ratio of 50%, the soil was air-dried to obtain treated soil, and the phosphoric acid absorption coefficient was measured in the same manner as in Example 1. As a result, a value of 7,500 #P2 and 100 was obtained.

実施例４ 実施例１とは別の沖積土壌（りん酸吸収係数５　＋　Ｏ
ＰｇＯ５ｍｙ／１ｏｏｙ　）に塩基性塩化アルミニウム
水溶液（Ａ４０．２０％、ＯＪ７．０％、塩基度８６％
）をＡ４０．３．０％になるように添加混合し風乾した
土壌（水弟１の発明）、及び同様に処理した後゛明細書
の浄書（内容に変更なしＪ 乾した」壌（水弟２の発明）をそれぞれｉ３゜叫長さ１
５ｍのカラムに充填し、上部がらりん酸す）　ＩＪウム
を用いて、ｐ、ｏ、ｓｏｏ■７ｔに調製した下水二次処
理水を５００閣／日の流速で連続的に通水し、カラム下
部がら浸出した処理水のｐ、ｏ５（〜／ｌ）を分析した
。　なお未処理土壌についても同様の操作を行ない、浸
出水（処理水）のｐ、ｏ５（ダ／／？）を分析した。Example 4 Alluvial soil different from Example 1 (phosphate absorption coefficient 5 + O
PgO5my/1ooy) and basic aluminum chloride aqueous solution (A40.20%, OJ7.0%, basicity 86%)
) was added and mixed to an A40.3.0% and air-dried soil (Suitei 1's invention), and soil treated in the same manner and then dried (no change in content J) 2 invention) respectively i3゜ shout length 1
A 5 m column was packed, and the upper part was filled with phosphoric acid. Secondary treated sewage water prepared to 7 tons of p, o, soo using IJum was continuously passed through the column at a flow rate of 500 m/day. The p and o5 (~/l) of the treated water leached from the lower part were analyzed. The same operation was performed on the untreated soil, and the p and o5 (da//?) of the leachate (treated water) were analyzed.

その結果を第３表に示す。The results are shown in Table 3.

第　３　表 ※１）　処理土壌　ＰＨ６，９５ ごつｖしん＼Ｉ牧’ＩＬ　／Ｊ　ＪＶ　ｌソＡ１．ｕ−
７０て彷≧ノＪ１１ζ比何−レノ虱十 昭和閏年き月９日 特許庁長官　若　杉　和　夫　殿　１゜１、事件の表示 昭和５８年特許願第２３３２７０号 ２、発明の名称 排水の処理方法 ３、補正をする者 事件との関係　特許出願人 タキカガク 名　称　多木化学株式会社Table 3 *1) Treated soil PH6,95 Gotsuvshin\Imaki'IL /J JV lso A1. u-
70 te ≧ no J11 3. Relationship with the case of the person making the amendment Name of patent applicant Taki Kagaku Co., Ltd.

Claims (6)

【特許請求の範囲】[Claims] （１）塩基性アルミニウム塩で処理した土壌を散水管の
周囲に埋戻すことからなる排水の処理方法。(1) A wastewater treatment method consisting of backfilling the area around the sprinkler pipe with soil treated with basic aluminum salt. （２）塩基性アルミニウム塩の塩Ｍ度が２５〜８５％で
ある特許請求の範囲第１項記載の方法。(2) The method according to claim 1, wherein the basic aluminum salt has a salt M degree of 25 to 85%. （３）処理した土壌が塩基性アルミニウム塩に由来する
アルミニウムを、Ａｌｔｏｓ　として風乾上に対し０１
〜５重量％含有したものである特許請求の範囲第１項記
載の方法。(3) The treated soil was treated with aluminum derived from basic aluminum salts as Altos.
The method according to claim 1, wherein the content is 5% by weight. （４）塩基性アルミニウム塩で土壌を処理した後、次い
でアルカリ性物質で処理した土壌を散水管の周囲に埋戻
すもことからなる排水の処理方法。(4) A wastewater treatment method comprising treating soil with a basic aluminum salt and then backfilling the soil around the sprinkler pipe with the soil treated with an alkaline substance. （５）　アルカリ性物質で処理した土壌のｐＨが４〜８
である特許請求の範囲第４項記載の方法。(5) The pH of soil treated with alkaline substances is 4 to 8.
The method according to claim 4. （６）　アルカリ性物質で処理した土壌が塩基性アルミ
ニウム塩に由来スるナルシミニウムをＡ６０゜として風
乾上に対し０．５〜７重量％含有したものである特許請
求の範囲第４項記載の方法。(6) The method according to claim 4, wherein the soil treated with an alkaline substance contains narciminium derived from basic aluminum salt in an amount of 0.5 to 7% by weight based on the air-dried soil as A60°.