Integration of these objects buried sewage treatment equipment
quality in suspended or dissolved form exists in sewage, can be decomposed by microbial biochemical effect.
Need to consume oxygen in the process of its decomposition, and thus is called oxygen contamination.
These pollutants can cause the water dissolved oxygen decrease, affect the growth of fish and other aquatic organisms.
After the water dissolved oxygen depletion, anaerobic decomposition of organic matter, produce the bad smell, such as hydrogen sulfide, ammonia and mercaptan worsen water quality further.
Composition of organic matter in water is very complex, oxygen concentration of organic matter per unit volume of water is commonly used oxygen consumption substances in the process of decomposition of biochemical oxygen, said that by biochemical oxygen demand (
General use 20 ℃, the five school days sewage treatment equipment and biochemical oxygen demand (
Sources of plant nutrients is wide, quantity is big, sewage (
Organic matter, detergent)
, agriculture (
Chemical fertilizer, farm manure)
, industrial waste water, waste, etc.
About 50 g per person per day into nitrogen in wastewater.
The sewage of phosphorus mainly comes from washing wastewater, and applied into the fields of chemical fertilizer with 50% ~ 80% flowing into rivers, lakes and underground water.
Phosphorus and nitrogen in natural water bodies (
Especially the phosphorus)
Content to a certain extent is to control the growth of plankton.
When a large number of nitrogen and phosphorus plant nutrients after discharged into water body, prompting some biological (
Such as algae)
Sharp reproduction growth, growth cycle shorter.
Algae and other plankton die by aerobic biological decomposition, depleting the dissolved oxygen in the water, or by anaerobic microbe decomposition, continuously produce the gas such as hydrogen sulfide, make water quality deterioration, killing a large number of fish and other aquatic organisms.
Algae and other plankton residue in the process of decay, and the biological need of nitrogen, phosphorus and other nutrients released into the water, algae and other creatures use for the new generation.
Therefore, after the eutrophication of water body, even to cut off the outside sources of nutrients, it is also hard to self-purification and return to normal levels.
Eutrophic water body is serious, some lakes can be numerous plants and its debris silting up, become a swamp even dry.
Local sea area can be turned into a 'dead', or 'red tides.
Life in the ocean with all kinds of aquatic animals and plants.
Biological and water, biology and biological is a complicated matter and energy exchange between, from the number of kept a dynamic balance.
But under the influence of human activity, the destruction of the balance.
When humans from discharging pollutants into the water, some useful aquatic organisms poisoning death, and some of the fouling resistance exacerbate reproduction of aquatic organisms, a large number of consumption of dissolved oxygen in water, make useful aquatic habitat was forced to move elsewhere from lack of oxygen, or death.
Especially some toxic elements, poorly soluble in water and in biological accumulation in the body, do great harm to human.
Such as the content of mercury in the water is very low, but in the content of aquatic organisms are very high, the content of fish and surprisingly high.
Assume that the concentration of mercury in water is 1
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