http://www.sd.xinhuanet.com/sd/jn/2013-08/08/c_116859871.htm
in July 23rd, the water level of the Xiaoqing River rose considerably, and a large amount of garbage was floating on the water. There are 12-15 tons per day in the central city of the city of in 1-4 months, 100 thousand tons of
Xiaoqing River is a microcosm of the problem of water pollution control in Ji'nan. Last year, Ji'nan was established by the Ministry of water resources as the first pilot city for the construction of water ecological civilization in the country. The first implementation was the management of the Xiaoqing River Basin, and this year the target of "seeing no sewage and smell strange" was put forward this year. Despite repeated large-scale renovation, the reality of pollution rebound tells us that the road of pollution control is not as smooth as imagined. In order to make a real move towards the water ecological city, what efforts should be paid to prevent pollution in Ji'nan from 1 to May? In the morning of July 30th, the reporter came to the Huang Tai plate bridge in the morning, and the Liu Jing River, an important tributary of the Xiaoqing River, came to the Xiaoqing River. At the intersection of the river and the Xiaoqing River, the river is no longer a eutrophic light green, but the soil is mixed with the soil yellow, and the garbage and dirt are everywhere on the river. On the riverside near the south side of the bridge, the reporter saw a large drainage outlet, and a large amount of yellow soil sewage was directly discharged into the Liu Hang river. In the last 1-5 months of this year, the water quality of the Huaihe and the south to North Water Diversion, the Haihe River and the peninsula was stable in 1-5 months, but the Xiaoqing River Basin showed a rebound trend. The average concentration of COD and ammonia increased to 30.4mg/L and 2.97mg/L, compared with the same period of last year. Bounce 5.4% and 52.6% respectively.
problem 1
national standard loose
Enterprise discharge is still sewage?
a large amount of sewage is discharged directly to Xiaoqing River every day without treatment. It is an important factor for the deterioration of the water quality of the Xiaoqing River. But on the other hand, the reality that some "standards" enterprises are repeatedly reported by the public shows that deterioration of water quality can not simply be attributed to excessive discharge of sewage.
a team led by Professor Ma of the school of environment, Renmin University of China, completed a report on "China's water environment protection price and tax policy demonstration research" over 4 years. According to the sampling survey of Professor Ma Zhong, it is found that the emission limits of some major pollutants in the water pollutant discharge standard of our country are far more loose than the surface water environmental quality standard, which leads to the "qualified" discharge of sewage, and the water quality is deteriorating. According to the
report, according to the current sewage discharge standards, "reaching the standard" is like an umbrella, and the enterprises "legally" discharge the sewage into the environment. In accordance with the current water price system, from water intake to sewage treatment, enterprises only pay very low cost, far below its environmental damage. And the difference is paid by the whole people.
according to Ma Zhong, China's water standards are mainly divided into two categories, environmental quality standards and pollutant discharge standards. The former refers to the "surface water environmental quality standard" and is divided into I-V class according to the water quality from high to low. COD (chemical oxygen demand) is the most commonly used indicator for describing water pollutants, while the COD concentration of all emission standards in China is higher than that of V water. That is to say, even the standard discharge water is inferior to class V water.
to this argument, Jie Yuzhong, director of the water environment management department of the Municipal Environmental Protection Bureau, said, "the pollutant discharge standard of urban sewage treatment plants in our city is currently generally implemented by the first grade A standard, and the maximum permissible concentration of COD (daily average) is 50 mg per liter, which can not reach the V class water COD less than 40 mg per liter." Under such standards, the "standard" emission of industrial sewage and domestic sewage is still the essence of this argument. Jie Yuzhong, director of the water environment management department of the Municipal Environmental Protection Bureau, said, "the pollutant discharge standard of urban sewage treatment plants in our city is currently generally implemented by the first class A standard, and the maximum permissible concentration of COD (daily average)) It is 50 milligrams per liter, less than V class COD, or less than 40 mg per liter. Under such standards, industrial sewage and domestic sewage discharged by the "standards" are still essentially sewage.
emissions standards are not up to quality standards, to a certain extent because of the self purification capacity of natural water bodies, which can reduce the degradation of pollutants when the emission standards are formulated. However, in the northern cities with water shortage, especially in the dry and less rainy season, the water self purification capacity is seriously insufficient because of the lack of surface runoff, and even the discharge of sewage even "up to the standard" often aggravates the environmental pollution.
COD content index of different water quality
class I < 15 water quality is good, only need disinfection treatment, after simple purification treatment can be used for drinking,
class II < 15 water quality is slightly polluted. Regular purification treatment for drinking
class III < 20 is suitable for centralized drinking, water source area two protection area, general fish protection area and swimming zone
< category IV < 30 > < < br />
< < 40 > < < < < < < < < < < < < < < < > < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < 30 > < < < < < < < < < < < < < < < < < < < < < < < < > > < < < < < < < < < < < < < < > > < < < < < < < < < < > > < < < < < < < < < > > < < < < < >.
inferior V.Gt in water area of agricultural water and general landscape; 40 water body is basically no use function
(Note: milligram / liter)