High-concentration fluorine chemical wastewater treatment technology

Abstract

The invention provides a high-concentration fluorine chemical wastewater treatment technology which comprises the following sequential treatment on the chemical wastewater: (1) classified collection, oil isolation and settling; (2) microelectrolysis decomposition; (3) Fenton oxidation; (4) neutralization and coagulation; (5) flocculation; (6) precipitation and sludge backflow; (7) re-neutralization; and (8) biochemical treatment. Through separate treatment on the acid-alkaline wastewater, refractory precipitate or complex generated when two kinds of wastewater are mixed can be avoided; before the wastewater enters a microelectrolysis reaction tank, alkaline wastewater is properly used as a pH regulator, and thus the addition of the pH regulator in the whole system is reduced; in the technology, part of the precipitated sludge flows back into a pH neutralizing tank, and thus the fluorine removal effect is improved; by mixing domestic wastewater with the production wastewater after physicochemical treatment, readily biodegradable organic nutrients can be introduced, and the salt concentration in water is further reduced so as to protect the microorganisms; and by adopting the technology, the problems of large investment and high operation cost in chemical wastewater treatment are solved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a high-concentration fluorine chemical wastewater treatment process. Background technique [0002] Fluorine chemical wastewater has high salinity, high concentration of organic matter and is difficult to biochemically treat. And it has certain carcinogenic effects on the tissue system of the human body. Its main pollutant is containing F - compounds, refractory organics, etc. Traditional chemical wastewater treatment processes such as chemical precipitation, electrolysis, and biological methods all have limitations such as poor effect and secondary pollution. [0003] The disclosed treatment method for fluorine chemical wastewater includes "a fluorine-containing wastewater treatment device based on Fenton oxidation reaction" (application number 201220640800.6), which was invented by Xu Jianhua of Suzhou Environmental Protection Co., Ltd. and others. The device in...

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Problems solved by technology

[0004] The present invention provides a treatment method for high-concentration fluorine chemical waste water to solve the problems of high-concentration fluorine chemical waste water with high toxicity and difficult biodegradation, to solve the problem of waste acid utilization in the factory, to solve the problems of high investment in chemical waste water treatment and poor treatment effect, etc. The new process includes the following steps: (1) Divide the chemical wastewater into acidic wastewater and alkaline wastewater, and carry out oil separation and sedimentation treatment on the two kinds of wastewater respectively, and send the treated wastewater into the acid storage tank and alkaline wastewater respectively. In the storage tank, the wastewater in the alkaline storage tank is blown off by air to remove ammonia nitrogen, and then mixed with the wastewater in the acidic storage tank; (2) Use a pH regulator to adjust the pH of the mixed effluent to 2-4, and then enter the micro-electrolysis reaction tank for further processing. Micro-electrolytic decomposition; (3) The effluent after micro-electrolytic decomposition enters the oxidation reaction tank for Fenton oxidation reaction; (4) The effluent from the Fenton oxidation reaction enters the neutralization tank, adding a regulator to neutralize the pH of the wastewater in the tank Adjust to 8, carry out the coagulation reaction, the regulator includes Ca(OH) 2 (5) The effluent of the coagulation reaction enters the flocculation tank, and flocculant is added to carry out the flocculation reaction; (6) The effluent of the flocculation reaction enters the sedimentation tank, and the solid-liquid separation is carried out in the sedimentation tank to obtain supernatant and sludge; (7) The supernatant enters the re-neutralization tank, adding H 2 SO 4 and nutrient salts, adjusted to make it suitable for microbial growth; (8) Biochemical treatment of the effluent regulated by the re-neutralization tank

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