Coking wastewater reuse treatment system and method thereof

Abstract

The invention relates to a coking wastewater reuse treatment system. The system is characterized in that the system comprises a coagulation pool (1), and the coagulation pool (1) is sequentially connected with an inclined plate sedimentation pool (2), an ultrafiltration device (3), an ultrafiltration water production pool (5), a first pump (6), a first filter (7), a second filter (8), a second pump (9), a nanofiltration device (10), a nanofiltration water production pool (11), a third pump (12), a third filter (13), a reverse osmosis device (14) and a reverse osmosis water production pool (15) through a pipeline. The invention also provides a coking wastewater reuse treatment method. The system has the advantages of stable treatment effect, low production running cost, simple operation running, realization of the water discharge through adopting a biochemical sedimentation pool, avoiding of the physical-chemical treatment segment after routine biochemical treatment, avoiding of the massive application of agents, reduction of the sludge throughout of the system, and reduction of the wastewater treatment running cost.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a waste water reuse treatment system and method, and more specifically relates to a coking waste water reuse treatment system and method. Background technique [0002] The composition of coking wastewater is complex, containing many organic and inorganic pollutants, such as ammonia nitrogen, cyanide, thiocyanate, phenolic compounds, polycyclic aromatic hydrocarbons (PAHs), nitrogen-containing heterocyclic compounds, oxygen-containing or sulfur-containing heterocyclic compounds and long-chain aliphatic compounds, etc. The mass fraction of phenolic compounds accounts for about 85% of the total organic matter, and the contribution of COD (chemical oxygen demand) reaches 80%; the inorganic matter is mainly cyanide, thiocyanate and ammonia nitrogen. These pollutants have high concentration, strong toxicity, refractory degradation, and carcinogenicity, which will cause conti...

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Problems solved by technology

For example, patent document 200710068327.2 uses biochemical effluent to prepare industrial water through oxidative flocculation + air flotation + anion and cation exchange + reverse osmosis; patent document 200810022437.X uses coking wastewater raw water to undergo oil removal treatment and then undergoes multi-media filtration + security filtration + primary Reverse osmosis + two-stage reverse osmosis; both are examples of coking wastewater reuse that have been studied in detail in recent years but have not been practically applied

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