초록 ▼

본 연구의 개발목표는 경제성 있는 증기재압축공정을 이용한 무방류형 축산폐수처리 시스템의 현장적용으로 처리용량 10 $m^3$/일의 실규모 플랜트에서 발생되어지는 문제점을 도출하여 이에 대한 문제점을 해결하고 방류 및 재활용시 적절한 처리공정을 제시하였다.
먼저 증발농축공정을 개발하는데 고려해야할 주요성계인자인 농축에 의한 비등점상승， 열교환기의 설계시 필요한 총괄열전달계수 및 증발과정에서 발생되는 거품을 효과적으로 제어할 수 있는 방법을 실험 및 분석을 통하여 고찰하였다. 또한, 현장적용된 단중효용 증기재압

본 연구의 개발목표는 경제성 있는 증기재압축공정을 이용한 무방류형 축산폐수처리 시스템의 현장적용으로 처리용량 10 $m^3$/일의 실규모 플랜트에서 발생되어지는 문제점을 도출하여 이에 대한 문제점을 해결하고 방류 및 재활용시 적절한 처리공정을 제시하였다.
먼저 증발농축공정을 개발하는데 고려해야할 주요성계인자인 농축에 의한 비등점상승， 열교환기의 설계시 필요한 총괄열전달계수 및 증발과정에서 발생되는 거품을 효과적으로 제어할 수 있는 방법을 실험 및 분석을 통하여 고찰하였다. 또한, 현장적용된 단중효용 증기재압축공정의 시스템을 운전하면서 시스템에서 발생된 폐수 유업에 따른 거품에 효율적인 제어 순환입자의 유출문제 및 증기압축기의 축봉문제와 기동문제의 해결방법을 제시하고 증기재압축공정 에서의 최적의 효용단을 설계로부터 결정하였다.
증발응축되어 처리된 처리수의 후처리를 위해 전기접촉산화공정을 적용하여 실험실에서 운전 실험을 수행하여 가능한 최적의 설계조건을 도출하였으며 On-line 제어방법올 적용하여 운전되는 시스템의 상태를 컴퓨터를 이용하여 제어할 수 있는 기술올 개발하였다. 또한 위탁과제를 통하여 250Torr에서 100Torr이상의 압력차가 발생되는 수증기 전용 압축기를 개발하고자 하였다.

Abstract ▼

I . Title of research
Field Application of Zero-effluent Livestock Wastewater Treatment System Using Vapor Recompression Process

II. Objects and necessity of research
Livestock wastewater is increasing on the increase of livestock consumption recently owing to the industrialization of a

I . Title of research
Field Application of Zero-effluent Livestock Wastewater Treatment System Using Vapor Recompression Process

II. Objects and necessity of research
Livestock wastewater is increasing on the increase of livestock consumption recently owing to the industrialization of a stock fonner, but the effected management and. treatment technology for livestock wastewater don't develope, and it focus on environmental problems.

The treatment technology and livestock wastewater divide into a resources technology like compost process and zero-effluent technology with biological treatment basically. This treatment technology has some problems because of sawdust purchase and high concentration of organic matters.

The physical treatment, which is good treatment efficiency, delay to technology development owing to high operating cost and instability of the system. The sort of physical treatment process is made up a membrane process and evaporation process. The problems of evaporation process are fouling of heat exchanger and the high energy cost.

This study was developed to evaporation technology with control the fouling heat exchanger and design the effected evaporator by economical optimization.
The condensate by evaporation-condensation of vapor in livestock wastewater is recycling to reuse for cleaning water of a cattle shed using post-treatment process, that is electro contact oxidation process and the concentrate in livestock wastewater makes a compost in the compost process.

III. Contents and scope of research
The targets of this study apply to the system for field application of zero-effluent livestock wastewater treatment. We tested a problem for operating of this system, that the capacity of treatment is lOm3/day scale.

The main parameters to be taken into account are a boiling point elevation means an increase its boiling temperature in comparison to the pure water, and the total heat transfer coefficient in order to design a heat exchanger, and the foaming problem produced in evaporation process.

Also, we showed the solving methoos for problems which are a control for foaming and overflow a glass bead over the heat exchanger and leaking in shaft sealing parts.

The condensate by evaporation-condensation was treated to the electro contact oxidation process for post-treatment, and we developed to the technology of on-line control of its plant by computer, and developed to a vapor recompressor from KIST.

IV. Results of the research
The conclusions for testing and analysing in laboratory and field are as follows;
- a boiling point elevation is below ${1^{\circ}C}$ in live stock wastewater containing 80% concentration.
- total heat transfer coefficient reduces to 50% according to viscosity to be increased by evaporation.
dosage flowrate of silicone anti-foaming agents is over 10 ppm, but increase until 60 ppm in field application.
- the type of circulating Fludized bed heat exchanger prefer outside one to inside one.
- the starting of vapor recompressor easy to using a inverter and the seal type of its prefer the one of lip seal with teflon materials containing carbon to oil seal.
- the effect number of the economical optimization of MVR process is double and the operating costs of double effect MVR process reduces 29% rather than the one of single effect MVR process.
- the quality of condensate is below 150 ppm based on BOD, SS, and it reduces that COD is 52%, $NH^+$ - N is 77% for post treatment using electro contact oxidation process.

V. Application plan of research results
We checked design and operating factors for double effect MVR system optimizing in order to treat livestock wastewater. We shall apply to field this plant during long term(over 1 year) and try to take trust and stabilization of this system.
We shall apply to special practice in water treatment parts by optimizing design for economical evaporation-concentration process
- livestock wastewater treatment process
- leachate in landfill and incinerated field
- high concentrated industrial wastewater treatment process
- concentration process of food industry
- desalination process of sea-water

목차 Contents

• 표지...1
• 제출문...2
• 요약문...3
• SUMMARY...7
• 목차...10
• CONTENTS...12
• 제1장. 서 론...14
• 제2장. 국내외 기술개발 현황...16
• 제1절. 축산분뇨 발생현황 및 처리현황...16
• 제2절. 축산폐수처리에 관한 기술동향...18
• 제3장. 연구개발수행 내용 및 결과...28
• 제1절. 증발농축공정의 이론적 배경...28
• 제2절. 증발공정 개발에 고려해야할 주요 설계인자...34
• 1. 비등점 상승...34
• 2. 총괄 열전달 계수...37
• 3. 거품지수...46
• 제3절. 단중효용 증기재압축공정 시스템의 실험적 운용 및 결과...50
• 1. 개요...50
• 2. 주용문제점 및 해결방안...53
• 3. 시스템 운용결과...62
• 제4절. 이중효용증발재압축공정 개발...70
• 1. 개요...70
• 2. MVR 증기재압축시스템의 최적화설계...72
• 3. 운전비용...77
• 제5절. 후처리용 전기접촉 산화처리공정 적용 실험...81
• 1. 이론적 배경...81
• 2. 실험방법 및 결과...83
• 3. 결 론...86
• 제6절. On-line 제어기술 개발...87
• 1. 개요...87
• 2. 시스템 구성...87
• 3. 제어방식...90
• 제4장. 연구개발목표 달성도 및 대외기여도...96
• 제5장. 연구개발결과의 활용계획...98
• 제6장. 참고문헌...99
• 제7장. 부록(위탁과제)...101