Coking wastewater advanced treatment and evaporative crystallization zero discharge process
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A technology for coking wastewater and evaporative crystallization, which is applied in the fields of oxidized water/sewage treatment, special compound water treatment, natural water treatment, etc. Reduce the risk of organic contamination, increase service life, and prolong the effect of regeneration time
Pending Publication Date: 2021-06-08
BEIJING JINDAYU ENVIRONMENT TECH CO LTD
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Due to the complexity of organic pollutants in coking wastewater, during the membrane concentration operation, the organic matter pollutes the membrane system very seriously, which has a great impact on the stable operation of the membrane system and the service life of the membrane elements. At the same time, the subsequent evaporation and crystallization The zero discharge system will also produce a large amount of mother liquor discharge, affecting the quality of crystallized salt and other issues
In addition, coking wastewater also contains calcium, magnesium, silicon, fluorine and other ingredients that are prone to scaling. In particular, the difficult-to-clean dirt such as calcium fluoride and silicate that may be
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[0092] Example 1
[0093] This embodiment is deeply processed on the coking wastewater after the chemical treatment of a coke plant, and the water consumption is 120m. 3 / h, inlet water quality indicators are shown in Table 1.
[0094] Table 1 water quality indicators
[0095] Serial number project unit Inlet water 1 pH - 6-9 2 COD Mg / L 150 3 NH 3 NN
[0096] See figure 1 The coking wastewater depth treatment and evaporation crystallization zero emission process of the present embodiment, including the following steps:
[0097] 1) Flocculation process
[0098] After the chemical treatment, the coking wastewater is mixed with the subsequent various anti-washed water, and the flocculation reaction tank is flocculated, and 50 mg / L is added to the flocculation reaction tank, and the hydraulic residence remains 15 min and continues to the flocculation reaction cell. Putting 2 mg / L of anionic polyacrylamide, hydraulic residence for 15 min, after flo...
Example Embodiment
[0129] Example 2
[0130] A certain coking factory coking wastewater biochemical water 160m 3 / h, circulating sewage 140m 3 / h, circulating sewage has been exchanged in the multi-media filter before chemistry, and the water quality indicators are shown in Table 2.
[0131] Table 2 Inlet water quality indicators
[0132] Serial number project unit Biochemical water Circulating sewage 1 pH - 6-9 6-9 2 COD Mg / L 200 40 3 NH 3 NN
[0133] The coking wastewater depth treatment and evaporation zero discharge process of this embodiment are substantially the same as in Example 1, mainly including the following steps (the same is no longer described):
[0134] After the chemical treatment, the coking wastewater is mixed with various anti-washed wastewater, and the flocculation reaction tank is introduced to perform flocculation treatment, and most suspended solids are removed by administering the polymer sulfate and nonionic polyacrylamide. The water en...
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Abstract
The invention provides a coking wastewater advanced treatment and evaporative crystallization zero discharge process which comprises the following steps: A) sequentially performing flocculation treatment, catalytic ozonation treatment, biological activated carbon filter treatment, multi-medium filtration, ultrafiltration treatment and first reverse osmosis concentration treatment on coking wastewater subjected to biochemical treatment, so as to obtain first treated water and first concentrated water; (B) sequentially subjecting the first concentrated water to two-stage softening treatment and second reverse osmosis concentration treatment to obtain second treated water and second concentrated water, wherein the first-stage softening adopts chemical softening and microfiltration combined filtration treatment, the second-stage softening adopts resin softening; and C) carrying out evaporative crystallization on the second concentrated water to obtain third treated water and crystal salt. The process is reasonable in linkage, stable, efficient and safe to operate and good in treatment effect, the treated water can be used as production process water or circulating cooling water replenishing water, finally zero emission of the coking wastewater is achieved, and economic benefits are remarkable.
Description
technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a coking wastewater advanced treatment and evaporation crystallization zero discharge process. Background technique [0002] With the shortage of water resources in our country and the increasingly stringent discharge requirements, most enterprises in industries with large water consumption and large emissions like the coking industry will choose to carry out advanced treatment to recover part of the water for reuse as finished product water, while the rest Concentrated water will be formed after partial concentration for internal consumption of the enterprise or discharged up to standard after treatment. [0003] According to investigations, the advanced treatment of wastewater in the coking industry is generally concentrated only once, and the recovery rate is generally around 70%. The brine produced around 30% is mostly digested within the company and i...
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