JPH05146799A - Method for disposing organic waste in reclamation - Google Patents
Method for disposing organic waste in reclamationInfo
- Publication number
- JPH05146799A JPH05146799A JP30962891A JP30962891A JPH05146799A JP H05146799 A JPH05146799 A JP H05146799A JP 30962891 A JP30962891 A JP 30962891A JP 30962891 A JP30962891 A JP 30962891A JP H05146799 A JPH05146799 A JP H05146799A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- sulfur
- sludge
- sulfate
- reduction reaction
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は有機性廃棄物の埋立処分
方法に関し、特に生ゴミとか消化汚泥等を埋立処分した
際に、経時的に発生するガスによる公害を防止する方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for landfill disposal of organic waste, and more particularly to a method for preventing pollution by gas generated over time when landfill disposal of raw garbage, digested sludge and the like. ..
【０００２】[0002]
【従来の技術】一般に家庭から排出される生ゴミは他の
可燃性のゴミとともに収集されて、焼却炉により焼却さ
れた後に埋立処分されるか、もしくは焼却されないまま
直接埋立処分されているのが実情である。又、消化汚泥
は脱水された後に焼却処分されるか、脱水ケーキの状態
として埋立処分されている。2. Description of the Related Art Generally, raw garbage discharged from homes is collected together with other combustible garbage and is either incinerated in an incinerator and then landfilled, or it is directly landfilled without being incinerated. It's a reality. The digested sludge is dehydrated and then incinerated or landfilled as a dehydrated cake.
【０００３】上記の生ゴミとか消化汚泥、脱水ケーキ等
を埋立処分すると、経時的に嫌気性の分解現象が起こ
り、一定期間後にメタンガスを主成分とするランドフィ
ルガスが発生して公害源となる懸念がある。特にメタン
ガスは地表への温室効果が同濃度の二酸化炭素よりも２
０倍も高いことが知られており、近年における地球の温
暖化という環境問題に対して好ましくない影響を与えて
しまう問題点を有している。更にメタンガスは上記温室
効果以外にも、該メタンガスの持つ引火性により火災を
発生し易いという問題点がある。When the above-mentioned garbage, digested sludge, dehydrated cake, etc. are landfilled, an anaerobic decomposition phenomenon occurs over time, and after a certain period, landfill gas containing methane gas as a main component is generated and becomes a pollution source. I have a concern. In particular, methane gas has a greenhouse effect on the surface of the earth 2
It is known to be 0 times higher, and has a problem that it has an unfavorable effect on the environmental problem of global warming in recent years. In addition to the above-mentioned greenhouse effect, methane gas has a problem that a fire easily occurs due to the flammability of the methane gas.
【０００４】これに対処するため、前記ランドフィルガ
スを回収して暖房とか発電に利用する試みも行われてい
るが、採取可能なランドフィルガスは全発生量の一部に
過ぎないので経済的な観点から難点があり、且つ埋立地
から発生するすべてのランドフィルガスを回収すること
は技術的に不可能である。[0004] In order to deal with this, attempts have been made to recover the landfill gas and utilize it for heating or power generation, but since the landfill gas that can be collected is only a part of the total amount produced, it is economical. However, it is technically impossible to recover all the landfill gas generated from the landfill site.
【０００５】他方において、有機性廃棄物の嫌気性処理
方法の１つに硫酸塩還元反応を利用する手段が注目され
ている。この硫酸塩還元反応はメタン発酵と競合関係に
あり、有機性廃棄物中の硫酸イオン濃度を高めることに
よりメタン発酵が抑制され、最終生成物として二酸化炭
素を主成分とするガスが発生する。従って生ゴミに硫酸
イオンを添加して埋立処分した場合とか、生ゴミや生汚
泥を硫酸塩還元反応によって処理した後の消化汚泥を脱
水ケーキとして埋立処分した場合には、経時的なメタン
ガスの発生が抑制され、公害防止効果に加えてメタンガ
スに起因する地表の温室効果を低くするという効果が得
られる。On the other hand, as one of the anaerobic treatment methods for organic waste, a means utilizing a sulfate reduction reaction has attracted attention. This sulfate reduction reaction has a competitive relationship with methane fermentation, and by increasing the concentration of sulfate ion in the organic waste, methane fermentation is suppressed, and a gas containing carbon dioxide as a main component is generated as a final product. Therefore, when sulphate ions are added to raw garbage for landfill disposal, or when digested sludge after treating raw garbage or raw sludge by a sulfate reduction reaction is landfilled as dehydrated cake, methane gas is generated over time. In addition to the pollution prevention effect, the effect of lowering the greenhouse effect on the surface due to methane gas can be obtained.
【０００６】[0006]
【発明が解決しようとする課題】しかしながらこのよう
な硫酸塩還元反応を利用した有機性廃棄物の処理方法
は、従来から積極的に行われていないのが実情である。
その理由として以下の３点が挙げられる。However, the method of treating organic wastes utilizing such a sulfate reduction reaction has not been positively carried out in the past.
The reasons are as follows.
【０００７】第１の理由として、硫酸塩還元反応の生成
物は前記二酸化炭素以外に硫化水素があり、この硫化水
素は悪臭及び毒性を有している上、金属を腐食する性質
があるため、大気中に放散させることはできない。従っ
てこの硫化水素の処理手段を考慮しなければならない。The first reason is that the products of the sulfate reduction reaction include hydrogen sulfide in addition to the carbon dioxide, and this hydrogen sulfide has a foul odor and toxicity and also has a property of corroding metals. It cannot be released into the atmosphere. Therefore, the means for treating this hydrogen sulfide must be taken into consideration.
【０００８】第２の理由として、前記した通常の埋立処
分によって経時的に発生するメタンガスを主成分とする
ランドフィルガスは、これを収集して脱硫し、エネルギ
ーとして再利用できるという利点があるのに対して、硫
酸塩還元反応によって発生する二酸化炭素を主成分とす
るガスは経済的に再利用するメリットがなく、且つ硫酸
塩還元反応を行った後の埋立地から発生するランドフィ
ルガスの脱硫を行うことは事実上不可能である。The second reason is that the landfill gas mainly composed of methane gas generated over time by the above-mentioned ordinary landfill disposal can be collected, desulfurized, and reused as energy. On the other hand, the gas mainly composed of carbon dioxide generated by the sulfate reduction reaction does not have the advantage of being economically reused, and the desulfurization of landfill gas generated from the landfill after the sulfate reduction reaction is performed. Is virtually impossible to do.
【０００９】第３の理由として、従来の硫酸塩還元反応
は、適用する有機性廃棄物の組成として硫酸イオン濃度
が比較的高いものに限定されており、硫酸イオン濃度が
低い場合には競合関係にあるメタン発酵が優勢になるた
め、硫酸イオンを常に補填しなければならず、そのため
の手間とか薬品のコストの面で不利であるという点にあ
る。The third reason is that the conventional sulfate reduction reaction is limited to the composition of the organic waste to be applied, which has a relatively high concentration of sulfate ion, and when the concentration of sulfate ion is low, the competitive relationship is present. Since methane fermentation in 2) becomes predominant, it must be constantly supplemented with sulfate ions, which is disadvantageous in terms of labor and chemical costs.
【００１０】上記３点の理由の中でも特に第１の理由が
大きく、硫酸塩還元反応によって生成する硫化水素の発
生を放置した場合の危険性は、メタンガスの発生を放置
した場合の危険性よりも多大であり、従って硫化水素の
発生に対する効果的な対策なしで硫酸塩還元反応を有機
性廃棄物の処理に適用することはできない。The first reason is particularly large among the above three reasons, and the risk of leaving the generation of hydrogen sulfide generated by the sulfate reduction reaction is greater than the risk of leaving the generation of methane gas. It is large and therefore the sulfate reduction reaction cannot be applied to the treatment of organic wastes without effective measures against the generation of hydrogen sulfide.
【００１１】この硫化水素の発生対策として、鉄粉とか
鉄屑を埋立地に散布することにより、発生する硫化水素
を硫化鉄として固定化する方法が考慮されるが、この方
法では生じた硫化鉄が酸性の条件下で溶解して再び硫化
水素を発生してしまうため、硫化水素の発生に対する一
時的な抑制効果しかなく、長期的な対策として有効でな
い上、経済的な面での難点もある。As a countermeasure against this generation of hydrogen sulfide, a method of fixing the generated hydrogen sulfide as iron sulfide by spraying iron powder or iron scraps to the landfill is considered, but this method produces iron sulfide. Dissolves under acidic conditions to generate hydrogen sulfide again, so it has only a temporary suppressing effect on the generation of hydrogen sulfide, is not effective as a long-term measure, and has an economic disadvantage. ..
【００１２】本発明は上記に鑑みてなされたものであ
り、特に比較的低有機物濃度を持つ廃棄物にも適用可能
である上、埋立処分地からのメタンの発生を抑制するこ
とが可能であり、且つ硫酸塩が還元された際の硫化物の
大気への放散を防止することができる有機性廃棄物の埋
立処分方法を提供することを目的とするものである。The present invention has been made in view of the above, and is particularly applicable to waste having a relatively low organic matter concentration, and can suppress the generation of methane from a landfill site. Moreover, it is an object of the present invention to provide a method for landfill disposal of organic waste, which can prevent the emission of sulfide into the atmosphere when sulfate is reduced.
【００１３】[0013]
【課題を解決するための手段】本発明は上記の目的を達
成するために、有機性廃棄物を硫酸塩還元反応槽で硫酸
塩還元菌により二酸化炭素に酸化するとともに、硫酸イ
オン及び硫黄を還元する工程と、硫黄脱窒槽で硫黄脱窒
細菌により還元硫黄を酸化し、脱窒を行う工程と、硝化
槽で硝化細菌によりＮＨ4−Ｎイオンの硝化を行う工程
と、廃水の残部を沈澱槽で固液分離して、沈降した汚泥
を前記硫酸塩還元反応槽内に沈降した汚泥とともに汚泥
濃縮槽に送り込んで高分子凝集剤で凝集処理する工程
と、上記硫酸塩還元反応槽から排出される排ガスに含有
されている硫化水素を脱硫装置によって脱硫した後に大
気中に放散する工程と、凝集処理された汚泥を脱水ケー
キに固形化して埋立処分する工程と、該脱水ケーキの埋
立処分地に地下水を均等且つ間欠的に散布する工程を実
施する有機性廃棄物の埋立処分方法を提供する。In order to achieve the above-mentioned object, the present invention oxidizes organic waste into carbon dioxide by a sulfate reducing bacterium in a sulfate reduction reaction tank and reduces sulfate ion and sulfur. And the step of oxidizing the reduced sulfur by sulfur denitrifying bacteria in the sulfur denitrifying tank to denitrify, the step of nitrifying NH 4 -N ions by the nitrifying bacteria in the nitrifying tank, and the remaining portion of the wastewater in the precipitation tank Solid-liquid separation with, the step of sending the settled sludge to the sludge concentration tank together with the settled sludge in the sulfate reduction reaction tank and performing a coagulation treatment with a polymer coagulant, and discharging from the sulfate reduction reaction tank After desulfurizing the hydrogen sulfide contained in the exhaust gas with a desulfurizer, it is released into the atmosphere, the process of solidifying the coagulated sludge into a dehydrated cake and landfill disposal, and the groundwater at the landfill site of the dehydrated cake. To Etc. and to provide a landfill disposal of organic waste to carry out intermittently sprayed to process.
【００１４】又、上記の硫酸塩還元反応槽から排出され
る排ガスから回収された硫化水素を還元硫黄又は還元硫
黄鉄塩として再度供給手段から硫黄脱窒槽に供給する方
法と、硫黄脱窒槽からの酸化数の高い硫黄の１部を硫酸
塩還元反応槽へ戻す還流機構及び硝化槽からの硫黄脱窒
に必要なＮＯ2−ＮとＮＯ3−Ｎを硫黄脱窒槽へ戻す還流
機構及び沈澱槽に沈降した汚泥の１部を硝化槽に戻す返
送機構とを設けた有機性廃棄物の埋立処分方法を提供す
る。In addition, a method for supplying hydrogen sulfide recovered from the exhaust gas discharged from the above-mentioned sulfate reduction reaction tank to the sulfur denitrification tank from the supply means again as reduced sulfur or reduced sulfur iron salt, and a method for supplying hydrogen sulfide from the sulfur denitrification tank A reflux mechanism for returning a part of sulfur with a high oxidation number to the sulfate reduction reaction tank and a reflux mechanism and a precipitation tank for returning NO 2 -N and NO 3 -N necessary for sulfur denitrification from the nitrification tank to the sulfur denitrification tank. Provided is a method for landfill disposal of organic waste provided with a returning mechanism for returning a part of settled sludge to a nitrification tank.
【００１５】[0015]
【作用】かかる有機性廃棄物の埋立処分方法によれば、
硫酸塩還元反応槽内の硫酸塩還元菌により有機性廃棄物
が二酸化炭素に酸化され、硫酸イオン及び硫黄の還元が
行われ、硫黄脱窒槽内の硫黄脱窒細菌によって還元硫黄
が酸化され、脱窒が行われる。硫酸塩還元反応槽から排
出される排ガスはその中に含まれる硫化水素が脱硫装置
によって脱硫されて大気中に放散される。上記硫黄脱窒
槽に還元硫黄又は還元硫黄鉄塩が供給され、還元硫黄は
酸化されて、より酸化数の高い硫黄となる。この酸化数
の高い硫黄の１部は硫酸塩還元反応槽に還流され、硫酸
塩還元反応の原料である酸化数が高い硫黄が該反応槽に
供給される。更に硝化槽内の硝化細菌によってＮＨ4−
Ｎイオンの硝化が行われる。この硝化槽からの排出液の
１部は硫黄脱窒槽に還流され、硫黄脱窒に必要なＮＯ2
−ＮとＮＯ3−Ｎが該硫黄脱窒槽に供給される。[Operation] According to the landfill disposal method of such organic waste,
Sulfate-reducing bacteria in the sulfate-reduction reaction tank oxidize organic waste to carbon dioxide, reduce sulfate ions and sulfur, and sulfur-denitrifying bacteria in the sulfur-denitrification tank oxidize and deoxidize reduced sulfur. Nitrogen is performed. In the exhaust gas discharged from the sulfate reduction reaction tank, hydrogen sulfide contained therein is desulfurized by a desulfurization device and is emitted into the atmosphere. Reduced sulfur or reduced sulfur iron salt is supplied to the sulfur denitrification tank, and the reduced sulfur is oxidized to become sulfur having a higher oxidation number. A part of the sulfur having a high oxidation number is refluxed to the sulfate reduction reaction tank, and the sulfur having a high oxidation number, which is a raw material for the sulfate reduction reaction, is supplied to the reaction tank. Furthermore, NH 4 − is generated by nitrifying bacteria in the nitrification tank.
Nitrification of N ions is performed. A part of the discharged liquid from this nitrification tank is returned to the sulfur denitrification tank and NO 2 necessary for sulfur denitrification is supplied.
-N and NO 3 -N is supplied to the sulfur denitrification tank.
【００１６】排出液の残部は沈澱槽に流入して固液分離
され、沈降した汚泥の１部は硝化槽に返送され、沈降し
た汚泥の残部は硫酸塩還元反応槽内に沈降した汚泥とと
もに汚泥濃縮槽で高分子凝集剤により凝集処理され、脱
水機によって脱水ケーキとして固形化されて埋立処分地
に埋め立てられる。そして埋立処分の終了後に地下水を
均等且つ間欠的に散布することにより、埋立処分地内部
で嫌気性分解が生じて、脱水ケーキ中の未分解の有機物
が再び硫酸塩還元反応を起こして二酸化炭素が生成し、
同時に硫黄脱窒反応を起こして還元硫黄の酸化と硝酸イ
オンの分子状窒素への還元が行われるので、脱水ケーキ
中の硫黄は、埋立処分地の内部で酸化と還元を繰り返
し、それに伴って大気中への硫化水素の放散が抑制され
る。The rest of the discharged liquid flows into the settling tank for solid-liquid separation, part of the settled sludge is returned to the nitrification tank, and the rest of the settled sludge is sludge with the settling sludge in the sulfate reduction reaction tank. It is coagulated with a polymer coagulant in a concentrating tank, solidified as a dehydrated cake by a dehydrator, and landfilled in a landfill site. Then, by spraying groundwater evenly and intermittently after the landfill disposal is completed, anaerobic decomposition occurs inside the landfill disposal site, and undecomposed organic matter in the dehydrated cake causes a sulfate reduction reaction again to generate carbon dioxide. Generate,
At the same time, a sulfur denitrification reaction is performed to oxidize the reduced sulfur and reduce nitrate ions to molecular nitrogen.Therefore, the sulfur in the dehydrated cake is repeatedly oxidized and reduced inside the landfill site, and as a result, it is discharged into the atmosphere. Emission of hydrogen sulfide into the interior is suppressed.
【００１７】[0017]
【実施例】以下、図面に基づいて本発明にかかる有機性
廃棄物の埋立処分方法の一実施例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for landfilling organic waste according to the present invention will be described below with reference to the drawings.
【００１８】図１は本発明の具体的な実施例を示す概要
図であって、図中の２は有機性廃棄物１が流入される密
閉タイプの硫酸塩還元反応槽であり、３は硫酸塩還元反
応槽２から排出された液が流入する硫黄脱窒槽である。
この硫黄脱窒槽３には、還元硫黄又は還元硫黄鉄塩が供
給される供給手段４が付設されており、更に該硫黄脱窒
槽３には、排出液の１部を硫酸塩還元反応槽２に還流す
るための返送管路７が配設されている。FIG. 1 is a schematic view showing a concrete embodiment of the present invention, in which 2 is a closed type sulfate reduction reaction tank into which organic waste 1 is introduced, and 3 is sulfuric acid. It is a sulfur denitrification tank into which the liquid discharged from the salt reduction reaction tank 2 flows.
The sulfur denitrification tank 3 is provided with a supply means 4 for supplying reduced sulfur or reduced sulfur iron salt. Further, in the sulfur denitrification tank 3, a part of the discharged liquid is supplied to the sulfate reduction reaction tank 2. A return pipe line 7 is provided for returning.
【００１９】５は硫黄脱窒槽３からの排出液が流入する
硝化槽である。この硝化槽５には、排出液の１部を硫黄
脱窒槽３に還流するための返送管路８が配設されてい
る。Reference numeral 5 is a nitrification tank into which the liquid discharged from the sulfur denitrification tank 3 flows. The nitrification tank 5 is provided with a return pipe 8 for returning a part of the discharged liquid to the sulfur denitrification tank 3.
【００２０】６は硝化槽５からの排出液が流入する沈澱
槽である。この沈澱槽６には、沈降した汚泥の１部を硝
化槽５に返送するための返送管路９が配設されている。Reference numeral 6 is a precipitation tank into which the discharged liquid from the nitrification tank 5 flows. The settling tank 6 is provided with a return pipe 9 for returning a part of the settled sludge to the nitrification tank 5.
【００２１】１０は沈降した汚泥の残部が送り込まれる
汚泥濃縮槽である。この汚泥濃縮槽１０には前記硫酸塩
還元反応槽２の底部から導出された汚泥管路２２が連結
されている。又、１１は処理水として放流される沈澱槽
６の上澄液である。Reference numeral 10 denotes a sludge thickening tank into which the remaining settled sludge is sent. The sludge thickening tank 10 is connected to a sludge pipe line 22 led out from the bottom of the sulfate reduction reaction tank 2. Further, 11 is the supernatant of the precipitation tank 6 which is discharged as treated water.
【００２２】１２は上記硫酸塩還元反応槽２から排出さ
れる排ガス２１が送り込まれる脱硫装置であり、この脱
硫装置１２内の脱硫物質は回収されて、前記還元硫黄又
は還元硫黄鉄塩の供給手段４に返送されるようになって
いる。Reference numeral 12 denotes a desulfurization device into which the exhaust gas 21 discharged from the sulfate reduction reaction tank 2 is fed, and the desulfurization substance in the desulfurization device 12 is recovered to supply the reduced sulfur or reduced sulfur iron salt. It will be returned to 4.
【００２３】尚、上記硫酸塩還元反応槽２と硫黄脱窒槽
３の配置を相互に入れ替えることも可能である。The sulfate reduction reaction tank 2 and the sulfur denitrification tank 3 can be replaced with each other.
【００２４】１３は凝集された汚泥の脱水機、１４は脱
水ケーキ、１５は脱水ケーキ１４の埋立処分地である。
この埋立処分地１５には、地下水１６に達するまでボー
リングされた吸水管１７が配設されている。１８は水ポ
ンプであり、この水ポンプ１８に連結された給水管１９
の先端部に地下水散布装置２０が配備されている。Reference numeral 13 is a dehydrator for the coagulated sludge, 14 is a dehydrated cake, and 15 is a landfill disposal site for the dehydrated cake 14.
The landfill 15 is provided with a water suction pipe 17 that is bored to reach the groundwater 16. Reference numeral 18 denotes a water pump, and a water supply pipe 19 connected to the water pump 18.
A groundwater sprinkler 20 is provided at the tip of the.
【００２５】かかる実施例の作用を以下に説明する。先
ず、有機性廃棄物１又はこの廃棄物を搾汁した液が硫酸
塩還元反応槽２に流入すると、槽内の硫酸塩還元菌によ
り有機物が二酸化炭素に酸化されるとともに、硫酸イオ
ンＳＯ4 2-（硫黄の酸化数６）又はＳＯ2 2-、Ｓ2Ｏ2-、
Ｓ（硫黄の酸化数がそれぞれ４，２，０）の硫黄の酸化
数−２（Ｓ2-）への還元が行われる。次に硫酸塩還元反
応槽２からの排出物は硫黄脱窒槽３に流入し、硫黄脱窒
細菌の作用に基づいて還元硫黄が酸化されるとともに、
ＮＯ3−Ｎ、ＮＯ2−ＮイオンのＮ2への還元、即ち脱窒
が行われる。この硫黄脱窒槽３には、供給手段４から還
元硫黄（硫黄の酸化数が４から−２）又は還元硫黄鉄塩
が供給される。還元硫黄は硫黄脱窒槽３で酸化されて、
より酸化数の高い硫黄となる。The operation of this embodiment will be described below. First, when the organic waste 1 or a liquid obtained by squeezing this waste flows into the sulfate reduction reaction tank 2, the sulfate reducing bacteria in the tank oxidize the organic matter into carbon dioxide, and the sulfate ion SO 4 2 - (Sulfur oxidation number 6) or SO 2 2- , S 2 O 2- ,
Reduction of S (oxidation number of sulfur is 4, 2, 0 ) to sulfur oxidation number -2 (S 2- ) is performed. Next, the discharge from the sulfate reduction reaction tank 2 flows into the sulfur denitrification tank 3, and the reduced sulfur is oxidized based on the action of the sulfur denitrifying bacteria.
Reduction of NO 3 —N and NO 2 —N ions to N 2 , that is, denitrification is performed. The sulfur denitrification tank 3 is supplied with reduced sulfur (oxidation number of sulfur from 4 to −2) or reduced sulfur iron salt from the supply means 4. The reduced sulfur is oxidized in the sulfur denitrification tank 3,
The sulfur has a higher oxidation number.
【００２６】該硫黄脱窒槽３からの排出液の１部、即
ち、酸化数の高い硫黄の１部は返送管路７を介して硫酸
塩還元反応槽２に還流され、硫酸塩還元反応の原料であ
る酸化数０〜６の硫黄が反応槽２に供給される。A part of the liquid discharged from the sulfur denitrification tank 3, that is, a part of sulfur having a high oxidation number is returned to the sulfate reduction reaction tank 2 through the return pipe 7 and is used as a raw material for the sulfate reduction reaction. Sulfur having an oxidation number of 0 to 6 is supplied to the reaction tank 2.
【００２７】硫黄脱窒槽３からの排出液の残部は、硝化
槽５に流入してエアレーションが行われ、硝化細菌の作
用に基づいてＮＨ4−ＮのＮＯ2−Ｎ又はＮＯ3−Ｎへの
酸化、即ち硝化が行われる。The remainder of the liquid discharged from the sulfur denitrification tank 3 flows into the nitrification tank 5 for aeration, and NH 4 —N is converted to NO 2 —N or NO 3 —N based on the action of nitrifying bacteria. Oxidation, ie nitrification, takes place.
【００２８】更に硝化槽５からの排出液の１部は返送管
路８を介して硫黄脱窒槽３に還流され、硫黄脱窒に必要
なＮＯ3−Ｎ、ＮＯ2−Ｎが硫黄脱窒槽３に供給される。Further, a part of the liquid discharged from the nitrification tank 5 is returned to the sulfur denitrification tank 3 via the return pipe line 8 so that NO 3 -N and NO 2 -N necessary for sulfur denitrification are contained in the sulfur denitrification tank 3. Is supplied to.
【００２９】硝化槽５からの排出液の残部は沈澱槽６に
流入して固液分離され、沈降した汚泥の１部は、返送管
路９を介して硝化槽５に返送され、沈降した汚泥の残部
は余剰汚泥として汚泥濃縮槽１０に送り込まれる。又、
沈澱槽６の上澄液１１は処理水として放流される。The rest of the discharged liquid from the nitrification tank 5 flows into the precipitation tank 6 for solid-liquid separation, and a part of the sludge that has settled is returned to the nitrification tank 5 via the return pipe 9 and settled sludge. The remaining part of is sent to the sludge thickening tank 10 as excess sludge. or,
The supernatant 11 of the settling tank 6 is discharged as treated water.
【００３０】上記硫酸塩還元反応槽２から排出される排
ガス２１の主成分は二酸化炭素であるが、この排ガス２
１中には硫化水素が含まれているので、この硫化水素は
脱硫装置１２によって脱硫、回収された後に大気中に放
散される。回収された硫化水素は、還元硫黄又は還元硫
黄鉄塩として再び供給手段４から硫黄脱窒槽３に供給さ
れて系内を再循環する。供給された還元硫黄の１部は、
硫酸イオンとなって硝化槽５から沈澱槽６を経て処理水
として放流される。従って処理水に溶解して放出された
分量に相当する還元硫黄を硫黄脱窒槽３に常時補充する
必要がある。The main component of the exhaust gas 21 discharged from the sulfate reduction reaction tank 2 is carbon dioxide.
Since 1 contains hydrogen sulfide, this hydrogen sulfide is desulfurized and recovered by the desulfurization device 12 and then released into the atmosphere. The recovered hydrogen sulfide is supplied again as reduced sulfur or reduced sulfur iron salt from the supply means 4 to the sulfur denitrification tank 3 and is recirculated in the system. Part of the reduced sulfur supplied is
It becomes sulfate ions and is discharged as treated water from the nitrification tank 5 through the precipitation tank 6. Therefore, it is necessary to constantly replenish the sulfur denitrification tank 3 with reduced sulfur corresponding to the amount dissolved and discharged in the treated water.
【００３１】このようにして汚泥濃縮槽１０には、沈澱
槽６に沈降した汚泥とともに汚泥管路２２を介して硫酸
塩還元反応槽２に沈降した汚泥とが送り込まれ、該汚泥
濃縮槽１０において高分子凝集剤が添加されて凝集処理
される。そして凝集処理された汚泥は脱水機１３によっ
て脱水されて、脱水ケーキ１４として固形化され、埋立
処分地１５に順次埋め立てられる。In this manner, the sludge thickening tank 10 is fed with the sludge settling in the settling tank 6 and the sludge settling in the sulfate reduction reaction tank 2 via the sludge conduit 22, and in the sludge thickening tank 10. A polymer flocculant is added and the flocculation treatment is performed. The coagulated sludge is dehydrated by the dehydrator 13, solidified as the dehydrated cake 14, and sequentially landfilled in the landfill disposal site 15.
【００３２】埋立処分の終了後、水ポンプ１８を稼働し
て地下水１６を吸水管１７を介して吸み上げ、給水管１
９と地下水散布装置２０を用いて埋立処分地１５に対し
て地下水１６を均等に散布する。この地下水１６の散布
は間欠的に行う。After the landfill disposal, the water pump 18 is operated to suck up the groundwater 16 through the water suction pipe 17, and the water supply pipe 1
9 and the groundwater spraying device 20 are used to spray the groundwater 16 evenly on the landfill site 15. This groundwater 16 is sprayed intermittently.
【００３３】すると地下水１６の散布によって埋立処分
地１５内で嫌気性分解が生じ、埋立てられた脱水ケーキ
１４中の未分解の有機物が再び硫酸塩還元反応を起こし
て二酸化炭素が生成する。同時に硫黄脱窒反応を起こし
て還元硫黄の酸化と硝酸イオンの分子状窒素への還元が
行われる。上記硫酸塩還元反応と硫黄脱窒反応の進行に
必要な種菌は埋立汚泥中に含有されており、汚泥の含水
率とか温度等の条件が適当な範囲にあれば上記の２つの
反応は同時に進行する。Then, the groundwater 16 is sprayed to cause anaerobic decomposition in the landfill site 15, and the undecomposed organic matter in the landfilled dehydrated cake 14 again causes a sulfate reduction reaction to generate carbon dioxide. At the same time, a sulfur denitrification reaction occurs to oxidize the reduced sulfur and reduce the nitrate ion to molecular nitrogen. The inoculum necessary for the progress of the sulfate reduction reaction and the sulfur denitrification reaction is contained in the landfill sludge, and if the conditions such as the water content and temperature of the sludge are within the appropriate ranges, the above two reactions proceed at the same time. To do.
【００３４】従って脱水ケーキ１４中の硫黄は、埋立処
分地１５の内部で酸化と還元を繰り返しており、そのた
め大気中への硫化水素の放散が抑制される。Therefore, the sulfur in the dehydrated cake 14 is repeatedly oxidized and reduced in the landfill disposal site 15, so that the emission of hydrogen sulfide to the atmosphere is suppressed.
【００３５】地下水１６には硝酸イオンが豊富に含まれ
ているため、この地下水１６を散布することは、処分地
１５への硝酸イオンの供給と、埋立汚泥の含水率を高め
て嫌気性分解を促進するという二重の作用が得られる。Since the groundwater 16 is rich in nitrate ions, spraying this groundwater 16 increases the water content of the landfill sludge and the anaerobic decomposition by supplying nitrate ions to the disposal site 15. The dual effect of promoting is obtained.
【００３６】従って本実施例によれば、埋立処分地１５
での硫化水素の発生を抑制しつつ、硫酸塩還元反応を起
こすことにより、地表の温室効果が高いメタンガスが発
生することを防止することができる。又、硫酸塩還元反
応によって生成する二酸化炭素はメタンガスに比して地
表の温室効果は少なく、しかも引火性がないため火災を
引き起こす惧れがないという特徴を発揮する。Therefore, according to this embodiment, the landfill 15
It is possible to prevent the generation of methane gas having a high greenhouse effect on the surface of the earth by causing a sulfate reduction reaction while suppressing the generation of hydrogen sulfide in the atmosphere. Further, carbon dioxide produced by the sulfate reduction reaction has a smaller greenhouse effect on the surface of the earth than methane gas, and since it has no flammability, it has the characteristic of not causing a fire.
【００３７】[0037]
【発明の効果】以上詳細に説明したように、本発明にか
かる有機性廃棄物の埋立処分方法は、脱水ケーキとして
埋め立てられた処分地に地下水を均等且つ間欠的に散布
することにより、埋立処分地内で嫌気性分解が生じて脱
水ケーキ中の未分解の有機物が再び硫酸塩還元反応を起
こして二酸化炭素が生成し、同時に硫黄脱窒反応によっ
て還元硫黄の酸化と硝酸イオンの窒素への還元が行われ
るので、脱水ケーキ中の硫黄は酸化と還元を繰り返すこ
とにより大気中への硫化水素の放散を抑制することがで
きる。As described in detail above, the method of landfilling organic waste according to the present invention is a method of landfilling by uniformly and intermittently spraying groundwater on the landfilled landfilled as dehydrated cake. Anaerobic decomposition occurs in the ground, undecomposed organic matter in the dehydrated cake causes a sulfate reduction reaction again to generate carbon dioxide, and at the same time, sulfur denitrification reaction causes oxidation of reduced sulfur and reduction of nitrate ion to nitrogen. Since the sulfur in the dehydrated cake is repeatedly oxidized and reduced, the emission of hydrogen sulfide to the atmosphere can be suppressed.
【００３８】更に本発明によれば、硫酸イオン濃度が低
く硫酸塩還元反応が起こりにくい有機性廃棄物にも採用
することが可能であり、しかも二酸化炭素よりも同じ濃
度で２０倍も温暖化作用のあるメタンの発生を抑制する
ことが可能である。上記硫酸塩還元反応はメタン発酵と
比較して低温下でも反応速度が低下しにくいという特徴
があり、嫌気性処理であるため、好気性処理に比して省
エネルギー効果が高いという効果がある。Further, according to the present invention, it is possible to use it for an organic waste having a low sulfate ion concentration and in which a sulfate reduction reaction hardly occurs, and moreover, at the same concentration as carbon dioxide, it has a warming effect 20 times. It is possible to suppress the generation of volatile methane. Compared with methane fermentation, the sulfate reduction reaction is characterized in that the reaction rate is less likely to decrease even at low temperatures. Since it is an anaerobic treatment, it has an effect of higher energy saving effect than an aerobic treatment.
【００３９】又、硫酸塩還元反応槽から排出される排ガ
スは二酸化炭素と硫化水素であるが、この硫化水素は脱
硫装置により除去され、回収された硫黄は脱窒に再利用
することができる。Exhaust gas discharged from the sulfate reduction reaction tank is carbon dioxide and hydrogen sulfide. The hydrogen sulfide is removed by a desulfurizer, and the recovered sulfur can be reused for denitrification.
【図１】本発明の具体的な実施例を示す概要図。FIG. 1 is a schematic diagram showing a specific embodiment of the present invention.
１…有機性廃棄物、２…硫酸塩還元反応槽、３…硫黄脱
窒槽、４…（還元硫黄又は還元硫黄鉄塩の）供給手段、
５…硝化槽、６…沈澱槽、１０…汚泥濃縮槽、１２…脱
硫装置、１３…脱水機、１４…脱水ケーキ、１５…埋立
処分地、１６…地下水、１７…吸水管、１８…水ポン
プ、１９…給水管、２０…地下水散布装置。1 ... Organic waste, 2 ... Sulfate reduction reaction tank, 3 ... Sulfur denitrification tank, 4 ... (Reduced sulfur or reduced sulfur iron salt) supply means,
5 ... Nitrification tank, 6 ... Sedimentation tank, 10 ... Sludge concentration tank, 12 ... Desulfurization device, 13 ... Dehydrator, 14 ... Dewatered cake, 15 ... Landfill site, 16 ... Groundwater, 17 ... Water absorption pipe, 18 ... Water pump , 19 ... Water supply pipe, 20 ... Groundwater sprinkling device.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０２Ｆ 3/34 １０１ Ａ 7158−4Ｄ 9/00 Ａ 6647−4Ｄ 11/00 Ｄ 7824−4Ｄ 11/02 7824−4Ｄ 11/14 Ｄ 7824−4Ｄ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location C02F 3/34 101 A 7158-4D 9/00 A 6647-4D 11/00 D 7824-4D 11 / 02 7824-4D 11/14 D 7824-4D
Claims (3)
塩還元菌により二酸化炭素に酸化するとともに、硫酸イ
オン及び硫黄を還元する工程と、硫黄脱窒槽で硫黄脱窒
細菌により還元硫黄を酸化し、脱窒を行う工程と、硝化
槽で硝化細菌によりＮＨ4−Ｎイオンの硝化を行う工程
と、廃水の残部を沈澱槽で固液分離して、沈降した汚泥
を前記硫酸塩還元反応槽内に沈降した汚泥とともに汚泥
濃縮槽に送り込んで高分子凝集剤で凝集処理する工程
と、上記硫酸塩還元反応槽から排出される排ガスに含有
されている硫化水素を脱硫装置によって脱硫した後に大
気中に放散する工程と、凝集処理された汚泥を脱水ケー
キに固形化して埋立処分する工程と、該脱水ケーキの埋
立処分地に地下水を均等且つ間欠的に散布する工程を実
施することを特徴とする有機性廃棄物の埋立処分方法。1. A step of oxidizing organic waste into carbon dioxide by a sulfate reducing bacterium in a sulfate reduction reaction tank, and reducing sulfate ions and sulfur, and reducing sulfur by a sulfur denitrifying bacterium in a sulfur denitrification tank. The step of oxidizing and denitrifying, the step of nitrifying NH 4 -N ions by nitrifying bacteria in a nitrifying tank, the remaining waste water is subjected to solid-liquid separation in a settling tank, and the sludge settling is subjected to the sulfate reduction reaction. The process of sending the sludge settling in the tank to the sludge concentrating tank and performing the coagulation treatment with the polymer coagulant, and after desulfurizing the hydrogen sulfide contained in the exhaust gas discharged from the sulfate reduction reaction tank by the desulfurization device, the atmosphere And a step of solidifying the coagulated sludge into a dehydrated cake for landfill disposal, and a step of uniformly and intermittently spraying groundwater to the landfill disposal site of the dehydrated cake. You Landfill disposal method for organic waste.
ガスから回収された硫化水素を還元硫黄又は還元硫黄鉄
塩として再度供給手段から硫黄脱窒槽に供給することを
特徴とする請求項１記載の有機性廃棄物の埋立処分方
法。2. The hydrogen sulfide recovered from the exhaust gas discharged from the sulfate reduction reaction tank is supplied to the sulfur denitrification tank from the supply means again as reduced sulfur or reduced sulfur iron salt. Landfill disposal method for organic waste.
部を硫酸塩還元反応槽へ戻す還流機構と、硝化槽からの
硫黄脱窒に必要なＮＯ2−ＮとＮＯ3−Ｎを硫黄脱窒槽へ
戻す還流機構と、沈澱槽に沈降した汚泥の１部を硝化槽
に戻す返送機構とを設けた請求項１記載の有機性廃棄物
の埋立処分方法。3. Sulfur with a high oxidation number from a sulfur denitrification tank
Part of the sludge that has settled in the settling tank, a reflux mechanism that returns the part to the sulfate reduction reaction tank, a reflux mechanism that returns NO 2 -N and NO 3 -N necessary for sulfur denitrification from the nitrification tank to the sulfur denitrification tank, The method for landfilling organic waste according to claim 1, further comprising a returning mechanism for returning the part to the nitrification tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30962891A JPH05146799A (en) | 1991-11-26 | 1991-11-26 | Method for disposing organic waste in reclamation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30962891A JPH05146799A (en) | 1991-11-26 | 1991-11-26 | Method for disposing organic waste in reclamation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05146799A true JPH05146799A (en) | 1993-06-15 |
Family
ID=17995322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30962891A Pending JPH05146799A (en) | 1991-11-26 | 1991-11-26 | Method for disposing organic waste in reclamation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05146799A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100503491B1 (en) * | 2000-08-26 | 2005-07-25 | 주식회사 삼윤이엔씨기술사사무소 | Stabilizing system and method for wastes reclaimed land using Desulfobacter |
| KR100538125B1 (en) * | 2005-05-02 | 2005-12-21 | (주)대성그린테크 | Wasted water recycling apparatus and method for rocess for early stabilization |
| JP4538133B2 (en) * | 2000-05-19 | 2010-09-08 | 日鉄環境エンジニアリング株式会社 | Method for early stabilization and generation of malodor in waste landfill site, chemical used in this |
| CN114455722A (en) * | 2022-02-11 | 2022-05-10 | 杭州绿色环保技术开发有限公司 | Full-flow biochemical treatment and reclaimed water recycling process for ink-jet printing wastewater |
-
1991
- 1991-11-26 JP JP30962891A patent/JPH05146799A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4538133B2 (en) * | 2000-05-19 | 2010-09-08 | 日鉄環境エンジニアリング株式会社 | Method for early stabilization and generation of malodor in waste landfill site, chemical used in this |
| KR100503491B1 (en) * | 2000-08-26 | 2005-07-25 | 주식회사 삼윤이엔씨기술사사무소 | Stabilizing system and method for wastes reclaimed land using Desulfobacter |
| KR100538125B1 (en) * | 2005-05-02 | 2005-12-21 | (주)대성그린테크 | Wasted water recycling apparatus and method for rocess for early stabilization |
| CN114455722A (en) * | 2022-02-11 | 2022-05-10 | 杭州绿色环保技术开发有限公司 | Full-flow biochemical treatment and reclaimed water recycling process for ink-jet printing wastewater |
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