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Coix seed oil production sewage treatment method

A technology for the production and treatment of sewage, which is applied in the direction of flotation water/sewage treatment, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Level discharge standards, high wastewater COD and other issues, to achieve the effect of reducing the treatment load, improving the quality of sewage discharge, and large treatment capacity

Inactive Publication Date: 2021-01-29
ZHEJIANG KANGLAITE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The amount of fatty acid salt and oil in the wastewater is unstable and the COD of the wastewater is high. The COD of the wastewater treated by this method is higher than 500mg / L, which cannot meet the third-level discharge standard of the "Comprehensive Wastewater Discharge Standard". It is necessary to expand the biochemical capacity and prolong the biochemical process. cycle to be resolved
This process has the disadvantages of less treatment capacity, poor treatment effect, and potential safety hazards due to the use of strong acid.

Method used

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  • Coix seed oil production sewage treatment method
  • Coix seed oil production sewage treatment method
  • Coix seed oil production sewage treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1Salting out and demulsification

[0035] Pump 1000kg of refined sewage into the demulsification tank, turn on the mixer of the demulsification tank, and slowly add 50kg of industrial grade NaCL with 5% of the total amount of sewage, and add it in about 10 minutes. Continue to stir for 30 minutes, stop stirring, let it stand for more than 30 minutes, open the drain valve at the bottom of the tank, drain the lower clear liquid to the comprehensive adjustment tank, observe the sight cup of the demulsification tank until flocs appear, and close the drain valve. Open the slag discharge valve of the demulsification tank, release the emulsion, pack it into a bag, drain it, and transport it outside.

[0036] 2 air flotation

[0037] Turn on the air flotation device, and after running for 5 to 10 minutes, turn on the lift pump to send the sewage in the comprehensive adjustment tank to the air flotation device. Open the scum scraper to scrape the upper layer of scum into the s...

Embodiment 2

[0045] 1Salting out and demulsification

[0046] Pump 5000kg of refined sewage into the demulsification tank, turn on the mixer of the demulsification tank, and slowly add 250kg of industrial grade NaCL with 5% of the total amount of sewage, and add it in about 20 minutes. Continue to stir for 1 hour, stop stirring, let it stand for more than 1 hour, open the drain valve at the bottom of the tank, drain the lower clear liquid to the comprehensive adjustment tank, observe the sight cup of the demulsification tank until flocs appear, and close the drain valve. Open the slag discharge valve of the demulsification tank, release the emulsion, pack it into a bag, drain it, and transport it outside.

[0047] 2 air flotation

[0048] Turn on the air flotation device, and after running for 5 to 10 minutes, turn on the lift pump to send the sewage in the comprehensive adjustment tank to the air flotation device. Open the scum scraper to scrape the upper layer of scum into the scum tan...

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Abstract

The invention relates to a coix seed oil production sewage treatment method, which comprises the following steps of: 1) salting out and demulsifying: after refining sewage enters a demulsification tank, starting a demulsification tank stirrer, slowly adding industrial-grade NaCl which accounts for 2-10% of the total weight of the refining sewage within 1-60min, continuously performing stirring for5min-2h, then stopping stirring, and conducting standing for 30min-24h, opening a water discharging valve at the bottom of the demulsification tank, discharging lower-layer clear liquid into a comprehensive adjusting tank, observing a visual cup of the demulsification tank until floccules appear, closing the water discharging valve of the demulsification tank, opening a slag discharging valve ofthe demulsification tank, discharging flocculent emulsified materials, conducting bagging, draining and then outward transporting for treatment; 2) air floatation: sending the sewage in the comprehensive adjusting tank to an air floatation device, starting a scum scraper to scrape upper-layer scum into a scum falling tank, collecting the scum, discarding the scum, and enabling the lower-layer clear liquid to overflow to a buried biochemical treatment device; and (3) biochemical treatment: enabling lower-layer clear liquid subjected to air floatation to flow into an oxidation pond of the buriedbiochemical treatment device, enabling the clear liquid to be in repeated contact with a biological membrane on the surface of the filler in the oxidation pond under an aerobic condition, purifying the clear liquid, and discharging the purified clear liquid to a sewage pipe network after the clear liquid reaches the standard.

Description

Technical field: [0001] The invention relates to a method for treating sewage produced in the process of producing oil and fat medicines, in particular to a method for treating sewage produced in coix seed oil. Background technique: [0002] Oil industry production sewage is produced in the process of oil refining and deep processing. It is a kind of organic sewage with high oil content. The sewage contains emulsified oil, soluble oil, saponin, etc. The water quality varies widely, and the COD is high, which can reach tens of thousands or even Hundreds of thousands, poor biodegradability, difficult to deal with. In the industry, pretreatment, oil separation, air flotation, anaerobic, aerobic and other processes are generally combined to meet the treatment requirements. The most critical step is pretreatment. The degree of demulsification in this process directly affects the subsequent treatment. Craftsmanship and effects make a big difference. According to different oil st...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/32
CPCC02F9/00C02F1/24C02F3/02C02F2103/322C02F1/40
Inventor 陈建华朱永敏鲍康德祝彩虹
Owner ZHEJIANG KANGLAITE PHARM CO LTD