ผลของทิศทางการป้อนสารอาหารต่อการพัฒนาฟิล์มชีวในถังปฏิกรณ์ แบบมีตัวกรองที่ใช้ผลิตก๊าซชีวภาพ

The Effect of Feeding Models on the Developments of Biofilm in Anaerobic Filter Reactor

Name: จุฬาภรณ์ กำเนิดเพชร

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Biogas

; Filter Reactor

; Fetiing Modes

; Distribution ofCOD or TVA

; Distribution of Microorganism

; ก๊าซชีวภาพ

; ถังปฏิกรณ์แบบมีตัวกรอง

; การกระจายของจุลินทรีย์

Abstract: The research aimed to study the effect of feeding mcdes on thedevelopment of biofilm in an anaerobic filter reactor treating tapiocawastewater. A 61.2 litrd anaerobic filter reactor with the workingvolume of 52 litres was us& throughout the study. The supportingmaterial used were PVC rings with the dimension of 1.8 X 1.8 cm. Thesurface area was 246 square metres per cubic metre with the voidfraction of 0.854. In this study, the modes of the fedflow of tapiocawastewater were designed and divided into 3 different directions:up and sideflow, downflow, and upflow. The reactor was fedcontinuously at varied organic loading rates and hydraulic retentiontimes (HRT).Feeding by up and sideflow direction promoted the distributionof the nutrient and biomass on the supporting material evenlythroughout the reactor. On the contrary, when either only downflow orupflow was employe&, a gradient of the organic materials was performedalong the height of the reactor. The difference in the concentrationof the organic matter along the reactors increase when there was ahigh organic loading and the HRT was less than 3 days. Moreover, itwas found that when the HRT was reduced, the efficiency in GOD removalwas also reduced. Particularly, the lowest GOD removal was seen in thereactor with the up and sideflow feeding. The rate of biogasproduction per kg.mD used with different feed flow was determined.The production were 0.42, 0.45, and 0.38 m3/kg r=(3D from the reactorswith downflow, up and sideflow, upflow respectively (at the organicloading rate of 3 kg COD/m'/day, 1 day HRT). Considering the biogasproduction per total solid, it was shown that in the downflow reactor,the amount of the total solid was highiest i.e.1428 gm, whereas inthe up and sideflow, and the upflow there were 1048 and 900 gm,respectively. In contrast, the amount of volatile suspended solid(VSS)in the downflow, up and sideflow, and upflow were 71%, 80%, and 75%,respectively. However, the biogas production per VSS in the 3 reactorswere the same in the range of 0.05-0.06 m3gas/g of VSS. The productionof biogas per reactor was 0.82, 0.88, and 0.79 m3/m3 reactor fromthe up and sideflow, downflow, and upflow feeding, respectively.From this results, it was concluded that1. The gas production and the efficiency in degrading theorganic materials depend& upon the amount of the volatile suspendedsolid (VSS). In the downflow reactor the amount of the VSS was highestand so was the gas productivity which was 0.86 m3/m3 reactor.2. F&garding the m3 of gas produced/kg COD used, this value inthe upflow reactor was the lowest. This was due to the biomass washedout in this types of the reactor which occured more than in othertypes, resulting in the reformation of the biomass.During the start-up period, the microorganisms congregated onthe surface of the supporting material. Subsmently, they fully grewand entrappd biomass within the void fraction. In the downflowreactor, most of the biomass was trapped; whereas in the up andsideflow, and the upflow reactors the biomass suspended in the liquidmedium. The up and sideflow feeding facilitated the distribution ofthe microorganisms uniformly throughout the reactors. From theactivity test using serum vial technique, biomass drawn from this typeof reactor showed the ability to utilize variety of carbons formethane production faster than those from other reactors. In additionit also show+ that this reactor was able to shorten the start-up timesignificantly. The increase in the remaining amount of the biomass inall types of the reactors when the operation time increased alsoassisted the increase in the organic loading rates to the system.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: รศ.ดร. มรกต ตันติเจริญ

Role: ประธานกรรมการ

Name: ผศ. สุภาณี เลศไตรรักษ์

Role: กรรมการ

Name: รศ.ดร. ศักรินทร์ ภูมิรัตน

Role: กรรมการ

Name: ดร. สุเมธ ชวเดช

Role: กรรมการ

Name: ผศ.นฤมล จียโชค

Role: กรรมการ

Created: 2534

Issued: 2005-04-04

Modified: 2006-05-31

วิทยานิพนธ์/Thesis

ISBN: 9748157172

CallNumber: BIT145

tha

DegreeName: วิทยาศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: เทคโนโลยีชีวภาพ

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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