城镇生活污水中COD 产生量=城镇生活污水中COD 产生系数×市镇非农业人口×365
Explanatory Notes on Main Statistical Indicators
Total Water Resources refers to total volume of water resources measured as run-off for surface water from rainfall and recharge for groundwater in a given area, excluding transit water.
Surface Water Resources refers to total renewable resources which exist in rivers, lakes, glaciers and other collectors from rainfall and are measured as run-off of rivers.
Groundwater Resources refers to replenishment of aquifers with rainfall and surface water.
Duplicated Measurement Between Surface Water and Groundwater refers to mutual exchange between surface water and groundwater, i.e. run-off of rivers includes some depletion with groundwater while groundwater includes some replenishment with surface water.
Water Supply refers to gross water supply by supply systems from sources to consumers, including losses during distribution.
Water Use refers to gross water use distributed to users, including loss during transportation, broken down with use by agriculture, industry, living consumption and biological protection.
Water Use by Agriculture includes uses of water by irrigation of farming fields and by forestry, animal husbandry and fishing. Water use by forestry, animal husbandry and fishing includes irrigation of forestry and orchards, irrigation of grassland and replenishment of fishing pools.
Water Use by Industry refers to new withdrawals of water, excluding reuse of water within enterprises.
Water Use by Living Consumption includes use of water for living consumption in both urban and rural areas. Urban water use by living consumption is composed of household use and public use (including services, commerce, restaurants, cargo transportation, posts, telecommunication and construction). Rural water use by living consumption includes both households and animals.
Urban Non-industrial Waste Water Discharge refers to annual discharge of non-industrial waste water by urban households. It is estimated by per capita coefficient using the formula:
Urban non-industrial waste water discharge = urban non-industrial waste water discharge coefficient urban non-agricultural population 365
Volume of Chemical Oxygen Demand (COD) Generated by Urban Non-industrial Waster Water refers to chemical oxygen demand generated through the annual discharge of non-industrial waste water by urban households. It is estimated as:
Volume of chemical oxygen demand (cod) generated by urban non-industrial waster water = Coefficient of COD generated through urban non-industrial waste water× urban non-agricultural population ×365
Chemical Oxygen Demand (COD) refers to index of water pollution measuring the mass concentration of oxygen consumed by the chemical breakdown of organic and inorganic matter.
Industrial Solid Wastes Produced refers to total volume of solid, semi-solid and high concentration liquid residues produced by industrial enterprises from production process in a given period of time, including hazardous wastes, slag, coal ash, gangue, tailings, radioactive residues and other wastes, but excluding stones stripped or dug out in mining (gangue and acid or alkaline stones not included). A stone is acid or alkaline depending on the pH value of the water below 4 or above 10.5 when the stone is in, or soaked by, the water.
Hazardous Wastes refers to those included in the national hazardous wastes catalogue or specified as any one of the following properties in the national hazardous wastes identification standards: explosive, ignitable, oxidizable, toxic, corrosive or liable to cause infectious diseases or lead to other dangers.
Industrial Solid Wastes Utilized refers to volume of solid wastes from which useful materials can be extracted or which can be converted into usable resources, energy or other materials by means of reclamation, processing, recycling and exchange (including utilizing in the year the stocks of industrial solid wastes of the previous year). Examples of such utilizations include fertilizers, building materials and road materials. The information shall be collected by the producing units of the wastes.
Ratio of Industrial Solid Wastes Utilized refers to the percentage of industrial solid wastes utilized over industrial solid wastes produced (including stocks of the previous years). It is calculated as:
Ratio of industrial solid wastes utilized = volume of industrial solid wastes utilized / (industrial solid wastes produced + stock of previous years) 100%
Stocks of Industrial Solid Wastes refers to volume of solid wastes placed in special facilities or special sites for purposes of utilization or disposal. The sites or facilities should take measures against dispersion, loss, seepage, and air and water contamination.
Industrial Solid Wastes Disposed refers to quantity of industrial solid wastes which are burnt or placed ultimately in the sites meeting the requirements for environmental protection and not salvaged or recycled (including disposition in the year of those wastes of previous years). The disposition includes landfill (Safe landfills should be conducted for hazardous wastes), incineration, containment spaces, deep underground disposal, backfill in mining pits and disposal at sea.
Industrial Solid Wastes Discharged refers to volume of industrial solid wastes discharged by producing enterprises to disposal facilities or to other sites. The wastes exclude stones stripped or dug from mining (gangue and acid or alkaline waste stones not included).
Consumption Wastes Transported refers to volume of consumption wastes collected and transported to disposal factories or sites. Consumption wastes are solid wastes produced from urban households or from service activities for urban households, and solid wastes regarded by laws and regulations as urban consumption wastes, including those from households, commercial activities, markets, cleaning of streets, public sites, offices, schools, factories, mining units and other sources.
Ratio of Consumption Wastes Treated refers to consumption wastes treated over that produced. In practical statistics, as it is difficult to estimate, the volume of consumption wastes produced is replaced with that transported. It is calculated as:
Ratio of consumption wastes treated = (consumption wastes treated / consumption wastes produced) ×100%
Investment in Environment Pollution Harnessing Projects refers to the proportion of investment in fixed assets in the total investment in harnessing industrial pollution and in the construction of urban environment infrastructure facilities. It includes investment in harnessing sources of industrial pollution, investment in environment protection facilities designed concurrently with construction projects, and investment in urban environment infrastructure facilities.