water pollutants and their sources(水污染及污染源)

admin管理员组

文章数量:1530842

2024年6月29日发(作者：)

Ppt1

Here I’d show the water pollutants and their sources.

Ppt2

The wide range of pollutants discharged to surface waters can be grouped into broad

classes, as shown in Table .

Domestic sewage and industrial wastes are called point sources.

Urban and agricultural runoff are called non-point sources.

[də'mestɪk] ['su：ɪdʒ]生活污水

城市和农业径流

Ppt3

Here I list some contaminants[kən'tæminənt]

The Oxygen-demanding material 需氧物质

Nutrients ['nju:triənt]营养物质

Pathogens Organisms['pæθədʒəns]病原微生物

Suspended solids or sediments['sɛdəmənt]沉积物

Salts

Toxic metals['tɒksɪk] 有毒金属

And we will discuss them later.

Ppt4 Point sources

First the point sources.

Domestic sewage and industrial wastes are called point sources because they are

generally collected by a network of pipes or channels and conveyed to a single point

of discharge into the receiving water.

As is shown in the picture.

Channels ['tʃænlz]通道，水槽

Domestic sewage consists of wastes from homes, schools, office buildings, and

stores.

The term municipal sewage is used to mean domestic sewage into which industrial

wastes are also discharged.

municipal sewage[mjʊ'nɪsɪp(ə)l]城市污水

In general, point source pollution can be reduced or eliminated through waste

minimization and proper wastewater treatment prior to discharge to a natural water

body.

eliminated[ɪ'lɪmɪnetɪd]消除

minimization[,mɪnɪmɪ'zeʃən]最小

Prior['praɪə]在前

Under the Federal Water Pollution Control Act of 1972 some animal feeding

operations (AFOs) may be designated as a point source.

AFOs are designated point sources if the feeding operation may be classified as a

concentrated animal feeding operation (CAFO).

AFOs is an organophosphorus pesticides

Fedaral 联邦

AFOs 灭蚜磷

Designated ['dɛzɪg,netɪd]指定的

organophosphorus[,ɔːg(ə)nəʊ'fɒsf(ə)rəs]有机磷

pesticides['pestɪsaɪdz]杀虫剂

Ppt5 Non-point sources

Urban and agricultural runoff are characterized by multiple discharge points.

These are called non-point sources.

['mʌltɪpl]多个

城市和农业径流具有多个放电点。

Often the polluted water flows over the surface of the land or along natural drainage

channels to the nearest water body.

Even when urban or agricultural runoff waters are collected in pipes or channels,

they are generally transported the shortest possible distance for discharge, so that

wastewater treatment at each outlet is not economically feasible.

drainage channels['dreɪnɪdʒ]排水沟

本文标签： 径流农业城市生活