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Limitations and suggestions for follow-up studies

7. Conclusion and limitations

7.2 Limitations and suggestions for follow-up studies

The occurrence of larvae in Korea became an issue from the time of occurrence in region I and region J in 2020. Therefore, little research has been conducted to solve the problem of small organisms. The literature review for this capstone project was also investigated within limited data because there were not many research results. In the future, as water purification plant facilities and operation methods are improved, problems related to small organisms can be solved. Therefore for now, the quantitative result of how much small organisms are suppressed and the problem is solved through the above improvement method is unknown. In the future, more reliable research results can be derived if the degree of occurrence of small organisms can be confirmed by performing improvements through pilot tests.

However, the improvement of old water purification facilities should be dealt with importantly in the basic national water supply plan proposed as an institutional solution. In addition, water purification facility operation managers and pipe network facility operation managers should be deployed in the right place to create a foundation for professionally solving water quality-related problems. I hope that more specific measures will be proposed and implemented to improve the culture of avoiding working in the water supply department.

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#References

Ministry of environment & Incheon city. (2021.11). Final Report on the epidemiological investigation of tap water larvae from Incheon water purification plant.

Jejudo. (2021.1). Final report on the epidemiological investigation of tap water larvae at Gangjeong water purification plant in Jejudo.

Ministry of environment. (2021.8). Prevention and Countermeasures for the occurrence of tap water larvae.

Ministry of environment. (2021.5). Guidelines on the monitoring method of larvae, etc. of water purification plant Chironomid.

Ministry of environment. (2020.12). Manual for responding to water quality of tap water.

American Water Works Association. (2004). Problem Organisms in Water : Identification and Treatment. 35~40

Xing-bin sun and Fu-Yi Cui. water science & technology: water supply. (2008). Inactivation of chironomid larvae with ozone.

SUN, Xingbin. Chemical industry and engineering v.57 no.3. (2006). Inactivation of Chironomid larvae from drinking water by ozone and its removal using ozone-GAC process.

US EPA. (2020). Water treatment manual: Filtration, 36

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Twort's Water Supply: 7th Edition. (2017). Specialized and Advanced Water Treatment Processes

Xiao-Bao Nie. Water science & Technology: Water Supply. (2018). Vertical distribution pattern of naidids in granular activated carbon filters and potential technology to control their penetration risk.

Journal of water supply. (2012). Removal efficiency of invertebrates in the filtrate of biologically activated carbon filter with sand bed.

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#Appendix 1: Questionnaire for interview with experts

 This survey was created for the purpose of listening to water supply experts for related opinions to carry out research projects on solving larva problems.

1. In order to solve larvae, this study proposed five policy and technical solutions. Do you have any views on this opinion?

2. Is there any opinion you want to add or exclude?

* 참고: 캡스톤 제안 내용 구분 정책적 제안 내용

1 관망개선사업에 편중된 예산의 재분배

(현대화사업 관망/정수장 개선 관련 예산 배분 총량 및 내용 분석)

2 정수시설 운영 자격증 제도 개선 및 지방상수도 분야 우수인력 배치 3 수돗물 처리 가이드라인 조정

(기존 탁도, CT값 만족 중심 -> 소형 이물질 발생 등 추가하여 수질기준 강화) 4

기존 소형생물 문제 발생지역 특별 의무관리 제도화

(필요시 실시간 모니터링 강화에 대한 기준 수립)

(유충은 서식환경과 기존 발생지의 문제점이 깊게 연관되어 있음)

5

유충발견 사전 예방을 위한 신규 정수장 설계 및 리노베이션 설계시 설계 평 가를 통한 유충 방지를 위한 시설물 보완 점수화하여 체크할 수 있도록 의무화

구분 기술적 제안 내용 1

조류경보 수치 등 사례를 참고로, 유충발생 위험도 parameter를 신규로 만들어 관리하도록 함

(parameter가 높아질수록 유충발생 위험도 증가/ 사고발생 선제적 대응)

2 particle counter 등의 원리와 같이 유충의 발생 정도를 사전에 예측할 수 있는

발생 모니터링 장치(ex. 유전자 분석장치)를 통한 관리 3

시설물 리노베이션을 통한 예방

(멤브레인 등 시설물 도입, 시설물 실내화를 통한 외부유입 원천 차단)

(간이개선: 필터 추가)

4 시설물 운영방식 개선을 통한 예방

(약품투입 강화, 약품 접촉시간 증대, 정수시설 여과과정 이중화 등)

5 신기술 도입 (전기파동 발생을 통한 살충 등)

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#Appendix 2 : Paper for AHP survey

<Survey for AHP Evaluation>

 This AHP survey is to evaluate priorities of proposals dealt in this capstone project research. Please read carefully and answer these questions with your consistent opinion.

1. Write a number of the recent larva accidents that you think are important to respond to or prevent.

- Please answer within Scope of weight calculation

- Accident recovery: Accident prevention = _______ : _______

* Scope is from 0~50, Sum is 100

2. There are a total of five policy solutions proposed in this study. Mark in a consistent position which of these you think is more important.

Factor 1: 적정한 재정계획 수립 (수질개선 관련 중장기 재정계획 및 관망예산조정)

Factor 2: 정수시설 운영 자격증 제도 개선 및 지방상수도 분야 우수인력 배치

Factor 3: 수돗물 처리 가이드라인 조정 (기존: 탁도, CT값 중심 -> 변경: 소형 이물질 등 추가)

Factor 4: 기존 소형생물 발생지역 특별 의무관리 제도화

Factor 5: 과업지시서와 시방서에 관련 내용을 포함한 용역 및 공사 입찰공고 추진

Evaluation item

Relative importance Evaluation

item Absolutely

important

Imprtant Eqaul

Important Absolutely

important

9 8 7 6 5 4 3 2 1 0

1 2 3 4 5 6 7 8 9

Factor 1 Factor 2

Factor 1 Factor 3

Factor 1 Factor 4

Factor 1 Factor 5

Factor 2 Factor 3

Factor 2 Factor 4

Factor 2 Factor 5

Factor 3 Factor 4

Factor 3 Factor 5

Factor 4 Factor 5

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