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A STUDY ON DEVELOPMENT OF ENERGY SELF-SUFFICIENT SEWAGE TREATMENT SYSTEM

能源自给污水处理系统开发研究

基本信息

批准号：
07835001
负责人：
NAGANO Katsunori
金额：
$ 1.22万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07835001/
关键词：
Sewage Treatment Energy Saving Energy Recovering Sludge Sludge Treatment Sludge Transformation to Oily Liquid Heat Pump Digestion エネルギ回収下水道下水消化ガス下水処理場凍結乾燥

项目摘要

The first, a questionnaire survey to the sewer institutions was conducted. Questionnaires were sent to 377 cities in Japan to seek for the energy consumption rate of the current sewer system. An answer was provided from 296 cities. As a result, it was appeared that a quantity of necessary electricity to treat unit sewage volume is 0.46 kWh and amount of 0.006 m^3 sludge come from unit sewage volume after treatment. Chemical heat capacity within unit sewage volume was approximately 1000 kcal. It was calculated that self-sufficient of electricity was more than 60% if unused energy was possible to apply a drying process of sludge.Next, energy recovery from sludge was estimated about next three methods. An index of estimating was energy consumption rate (ECR). This index means that a ratio of the amount of input energy to the amount of recovering energy. The first was sludge dehydration and drying processes with freezing and thawing pre-treatments. In this system ECR became 1.8 despite the effective use of a heat pump in drying process. The second was digestion. ECR became 0.93. Although using a cogeneration process was assumed, the value of ECR is near 1.0. The third was transformation to oily liquid from sludge. It was estimated that ECR was 0.55. This value means that the amount of energy recovering was approximately 2 times of input energy. Although various problems in actual plants, the transformation to oily liquid from sludge has some possibility of actualizing a energy self-sufficient sewage plant.

首先，对污水处理机构进行了问卷调查。向日本377个城市发送了调查问卷，以了解当前下水道系统的能源消耗率。296个城市提供了答案。结果显示，处理单位污水量所需的电量为0.46 kWh，处理后单位污水量产生的污泥量为0.006 m^3。单位污水量内的化学热容约为1000千卡。通过计算得出，如果将剩余的能量用于污泥的干化处理，则污泥的电能自给率可达60%以上。评价指标为能源消耗率（ECR）。该指标是指输入能量的量与回收能量的量的比率。第一个是污泥脱水和干化过程与冻融预处理。在该系统中，尽管在干燥过程中有效地使用了热泵，但ECR变为1.8。第二个是消化。ECR变为0.93。虽然假设使用热电联产过程，但ECR的值接近1.0。三是污泥油化。估计ECR为0.55。该值意味着能量回收量约为输入能量的2倍。虽然在实际工厂中存在各种问题，但将污泥转化为油性液体具有实现能源自给自足的污水厂的可能性。