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The Pilot Study of the Effect of White-Mud Desulfurization Sea-Water to Marine Environment in Jiaozhou Bay

Author: ChiXiaoJing
Tutor: SunYingJie
School: Qingdao Technological University
Course: Environmental Engineering
Keywords: Pak Nai desulfurized seawater Marine ecology Suspended solids Sulfate Seaweed Growth Affect
CLC: X55
Type: Master's thesis
Year: 2009
Downloads: 19
Quote: 0
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Abstract


Pak Nai is the the soda residue produced in the ammonia soda process of production of soda ash, ammonia stripping processes produce waste liquid filter press. China is the world's largest soda ash largest producer of soda ash production in 2007 reached the 1720 × 4 t, where ammonia soda production of 871 × 10 4 t, total production 50.6%. Ammonia soda production of soda ash Pak Nai pollutants producing coefficient of 0.30 ~ 0.35t / t product. For example, only the Qingdao Alkali plant soda ash production 50 × 10 4 t / a, Pak Nai generation reaches approximately 18 × 10 4 t / a. More than a simple stockpiling or emissions, resulting in a large number of occupied land and coastal beach pollution. Due to the Pak Nai belongs alkaline substances, the pH value of between 10 to 12, currently in Qingdao Pak Nai has been achieved for the coal-fired power plants or thermal power plant flue gas desulfurization industrial application, the plant two 130t / h and run effect of a 220t / h coal-fired boiler flue gas industrialization desulfurization efficiency can reach more than 97%. The Pak Nai seawater FGD achieve bidirectional management of the Pak Nai solid waste and flue gas SO 2 , but after desulfurization seawater due to the introduction of the Pak Nai component into the sea, whether it will produce environmental risk is currently no conclusion. Seawater FGD impact on the marine environment has been more research and related studies have shown that seawater desulfurization emissions seawater has less impact on the marine environment. Pak Nai seawater FGD process and discharge water quality of the wastewater discharge it be marine ecological impact of research significance. Qingdao Alkali the Pak Nai desulfurization emissions seawater source first to predict the wastewater discharge of suspended solids and sulfate of marine contribution expected to make excessive concentration of seawater, whether it be the marine environment caused by pollution. Seen by the predicted results: after the Pak Nai desulfurization water discharged into the sea, which suspended solids will not cause sea water quality super three categories, super four categories, the simulation shows that the the Super Grade II envelope area of ??6.11km < / sup>. Sulfate is discharged into the sea after, diffusing its concentration rapidly decreased, most of the concentration values ??of less than 200mg / L, wherein the concentration value of less than 200mg / L of the envelope area of ??8.3 km 2 , concentration value of less than 100 mg / L of the envelope area of ??44.1km 2 . Experiment, with the exception of an equilateral golden algae algae growth in the concentration of sulfate, the remaining algae when the concentration of sulfate proliferating number of 0.1g / L, the sulfate concentration is larger algae certain extent. It also can be seen, sulfate addition to equilateral golden algae seaweed a certain extent, but the impact is small, does not produce toxic effects. Water quality in a mixed impact on the algae experiment, the Pak Nai desulfurization seawater join four algae presents different characteristics of Gymnodinium significantly inhibited equilateral golden algae Skeletonema costatum and triangular The Phaeodactylum has significant role in promoting. Mechanism after the to join Pak Nai desulfurization seawater the Pak Nai desulfurization complexity of the components of seawater, different algae exhibit growth characteristics are not sure yet.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Marine pollution and its prevention
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