Method for treating leather-making industrial wastewater
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A technology for industrial wastewater and treatment methods, which is applied in animal processing wastewater treatment, biological water/sewage treatment, flotation water/sewage treatment, etc., and can solve problems such as low ammonia nitrogen removal rate, unsatisfactory removal effect, and water pollution. , to achieve the effect of improving the biochemical treatment effect, shortening the hydraulic retention time, and reducing the occupied area
Active Publication Date: 2010-09-15
JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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The main characteristics of tannery industrial wastewater are: 1. There are more tanning debris, suspended solid particles (SS) and oil in the wastewater; 2. The concentration of organic pollutants in the wastewater is high and the biochemical properties are poor
(3) Contains heavy metal pollutants, and the content of ammonia nitrogen is relatively high, and any discharge will seriously pollute the water body
[0017] Biological contact
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[0033] Reference attached figure 1 In the method for treating wastewater from the tanning industry of the present invention,
[0034] a. First, pump the tannery wastewater into the grid pool to intercept and filter the suspended solids in the wastewater; the purpose of the grid process is to effectively intercept and filter the hair and other sundries in the tanning wastewater to protect the subsequent treatment The equipment in the system is operating normally.
[0035] b. Inject the wastewater obtained in step a above into a regulating tank equipped with an aeration device to homogenize the wastewater in the tank; the purpose is to effectively adjust the water quality and quantity of wastewater from the tanning industry.
[0036] c. The waste water obtained in step b is injected into the air flotation tank, and the suspended solid particles and oily substances are removed after the air flotation and slag scraping. The reason is that these substances are present in large amounts in...
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Abstract
The invention discloses a method for treating leather-making industrial wastewater, sequentially comprising the following steps of: filtering, homogenizing; air flotation sludge scraping; adding alkali and flocculant to obtain sedimentation; separating mud from water; regulating pH value back; carrying out anoxic biochemical treatment and aerobic treatment; and delivering wastewater into a membrane biological reaction tank. The membrane biological reactor is filled with cultivated activated sludge and provided with a hollow fiber membrane assembly, and water is pumped out by a dump pump afterfiltered by the membrane assembly. In the method, the hollow fiber membrane assembly is adopted to replace a secondary sedimentation tank in the traditional technique and reduce the occupied area of the treatment system; meanwhile, the problem of sludge expansion in the traditional suspension activated sludge process is solved; the quality of outflow water is stable and reliable; and the operation is relative simple and convenient.
Description
Technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating wastewater from the leather industry. Background technique [0002] Leather production has to go through a variety of complex physical and chemical processes such as soaking, liming and dehairing, deliming, pickling, tanning, neutralization, fatliquoring, dyeing, etc., using a large number of chemical materials, such as acids, alkalis, salts, and sodium sulfide , Lime, surfactants, chrome tanning agents, fatliquors, dyes, organic additives, etc., except for a part of it is absorbed, a large part of it enters the wastewater and causes pollution. The main characteristics of tannery wastewater are: 1. The wastewater contains more tannery debris, more suspended solids (SS) and oil content; 2. The wastewater has a high concentration of organic pollutants and poor biochemical properties. (3) Containing heavy metal pollutants, the content of ammonia nitrogen is also ...
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