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Method for treating biomass gasified gas washing wastewater and for resource utilization of wastewater treatment product

A wastewater treatment and biomass technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution, inconvenient transportation, difficult to dissolve, etc., and achieve strong Adsorption capacity, good adsorption effect, large specific surface area effect

Inactive Publication Date: 2017-11-24
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Biomass energy is a kind of renewable energy with large quantity, wide range and low cost, but it is not easy to transport because of its large volume and low calorific value.
Combustible gas with high calorific value and convenient transportation can be obtained by gasifying biomass. However, due to impurities such as dust and tar, it is necessary to wash the combustible gas generated by the biomass gasification furnace. The waste water generated during the gas washing process contains a large amount of difficult Dissolved and refractory organic matter, high concentration of volatile phenols, inhibit and poison microorganisms, poor biodegradability of wastewater
Conventional water treatment technology is difficult to completely degrade this kind of wastewater, and many treatment processes will produce secondary pollutants while treating wastewater

Method used

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  • Method for treating biomass gasified gas washing wastewater and for resource utilization of wastewater treatment product
  • Method for treating biomass gasified gas washing wastewater and for resource utilization of wastewater treatment product
  • Method for treating biomass gasified gas washing wastewater and for resource utilization of wastewater treatment product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The amount of waste water produced is 5m 3 / h, the biomass gasifier works continuously for 24 hours a day, and the daily waste water production is 120m 3 / d.

[0030] The wastewater quality indicators are as follows:

[0031]

[0032] Pass the waste water from biomass gasification and scrubbing into the cyclone separator to remove substances with a density greater than water;

[0033] After that, the waste water is passed into the middle pool to buffer the water quality, reduce the water temperature, remove large particles, and adjust the pH value of the waste water to 5.0;

[0034] Afterwards, the waste water flows into the coagulation sedimentation tank, and the addition of 0.07% polyaluminum chloride (made into a 5% solution before use) by mass percentage is added, and after rapid stirring for 30 seconds, slow stirring for 20 minutes, and then adding 0.003% polyaluminum chloride Acrylamide (prepared as a 0.2% solution before use), stirred at a slow speed for 10...

Embodiment 2

[0042] Take the wastewater treated in the coagulation section of the biomass gasification wastewater of the factory, and the water quality indicators are as follows:

[0043]

[0044] Pass the wastewater or adjust the pH value into the adsorption tower filled with walnut shell activated carbon and coconut shell activated carbon respectively. The filling amount of activated carbon is 4kg / t wastewater, and the residence time of the wastewater in the adsorption tower is controlled by the circulation pump to 120 minutes.

[0045] Afterwards, the waste water flows into two clear water tanks respectively.

[0046] After the wastewater is treated by the above process, the pollutants in the wastewater are removed to varying degrees. The measured water quality indicators after the two kinds of activated carbon adsorption treatment are as follows:

[0047]

[0048] Walnut shell activated carbon has a better adsorption effect on organic matter in wastewater than coconut shell activat...

Embodiment 3

[0050] Collect waste walnut shell activated carbon and anthracite after many times of adsorption, and the analysis results are as follows:

[0051]

[0052] Grind waste walnut shell activated carbon and anthracite into powder below 180 mesh.

[0053] After that, 66 g of anthracite powder, 0.24 g of sodium methylene naphthalenesulfonate-styrenesulfonate-sodium maleate and 40 ml of deionized water were weighed.

[0054] Then mix sodium methylene naphthalene sulfonate-sodium styrene sulfonate-sodium maleate with deionized water and stir well until completely dissolved.

[0055] Then add anthracite powder, mix and stir evenly, and make coal water slurry 1.

[0056] Afterwards, the deionized water of spent walnut shell activated carbon and 33g of anthracite powder, 0.24g of sodium methylenenaphthalenesulfonate-styrenesulfonate-sodium maleate and 40ml of deionized water were weighed respectively.

[0057] Then mix sodium methylene naphthalene sulfonate-sodium styrene sulfonate-...

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Abstract

The invention discloses a method for treating biomass gasified gas washing wastewater and for resource utilization of the wastewater treatment product. The method can effectively remove COD in the wastewater and reduce the concentration of organisms; the treated wastewater can be recycled or discharged up to standard; the wastewater treatment product serves as one of the raw materials to prepare coal water slurry. The method mainly comprises the following steps: (a) feeding the biomass gasified gas washing wastewater into a cyclone separator to remove the substances of which the densities are higher than that of water; (b) feeding the wastewater into an intermediate water tank, buffering the water quality, and reducing the water temperature to remove large-particle substances, and regulating the pH value of the wastewater; (c) feeding the wastewater into a coagulation sedimentation tank to remove fine-particle substances, colloidal substances and some of ammonia nitrogen; (d) feeding the wastewater into an activated carbon adsorption tower to remove most of the soluble organic substances; (e) feeding the wastewater into a clear water tank for recycling or discharging up to standard; (f) preparing coal water slurry by taking the adsorbed waste activated carbon as a raw material.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating biomass gasification and scrubbing wastewater and resource utilization of wastewater treatment products. Background technique [0002] Biomass energy is a kind of renewable energy with large quantity, wide range and low cost, but it is not easy to transport because of its large volume and low calorific value. Combustible gas with high calorific value and convenient transportation can be obtained by gasifying biomass. However, due to impurities such as dust and tar, it is necessary to wash the combustible gas generated by the biomass gasification furnace. The waste water generated during the gas washing process contains a large amount of difficult Dissolved and refractory organic matter, high concentration of volatile phenols, have inhibitory and toxic effects on microorganisms, and the biodegradability of wastewater is poor. Conventional water ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C10L1/32
CPCC02F1/283C02F1/38C02F1/5245C02F1/56C02F1/66C02F9/00C02F2001/007C10L1/326
Inventor 徐美娟高夫燕蒋跃军李建新王永川
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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