Method with zero discharge of waste water

A zero-discharge, wastewater technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, heating water/sewage treatment, etc. Effect

Inactive Publication Date: 2010-01-20
ACTION PERFECT ENG XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The waste water can be mixed with cooling water tower drainage and water treatment system drainage after anaerobic and aerobic treatment in the wastewater treatment plant. M-Alk.) is 200-2000ppm, TDS is 2000-3000ppm, pH value is 8-14, meets the national first-level discharge standard and is directly discharged, causing a lot of waste of water resources

Method used

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Embodiment 1

[0024] The industrial wastewater flows into the wastewater treatment plant, and after anaerobic decomposition and aerobic decomposition treatment in sequence, 70% to 90% of the organic matter in the wastewater is decomposed, and the chemical oxygen demand (COD) in the discharge water of the wastewater treatment plant is less than 60ppm. SS) <60ppm.

[0025] The obtained effluent from the wastewater treatment plant passes through a reclaimed water reuse plant composed of a simple reverse osmosis membrane group to recover clean water with relatively low water quality, which can be reused as supplementary water for cooling water towers. The concentrated water part of the reclaimed water reuse plant and the cooling water tower drainage and water treatment system inorganic waste water flow through the fluidized bed crystallizer (FBC). The fluidized bed crystallizer is filled with silica sand. By adding acid or alkali or Na 2 CO 3 Adjust the pH value to 9.0~12.0, calcium and magnes...

Embodiment 2

[0033] The difference between embodiment 2 and embodiment 1 is that the following steps are also included: the production of PTA comprising purified terephthalic acid (PTA), crude terephthalic acid (CTA), BA, PT acid, 4-CBA and HAC The waste water (PTA mother liquor) discharged in the waste water flows into the PTA mother liquor recovery system, and most of the PTA mother liquor contained in the PTA mother liquor is filtered by the filter of the PTA mother liquor solid recovery system, and the COD of the wastewater is reduced by 70% to 80%; The PTA slurry is dissolved, and the PTA solid is recovered. Then the waste water flows into the PTA mother liquor metal recovery system, and regenerated acid is added. The regenerated acid can be hydrochloric acid, bromic acid or sulfuric acid to recover heavy metal ions such as cobalt and manganese. The wastewater treated by the PTA mother liquor metal recovery system flows into the wastewater treatment plant together with the CTA process...

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Abstract

The invention discloses a method for zero discharge of waste water, which comprises the following steps that: the industrial waste water is subjected to anaerobic decomposition treatment and aerobiotic decomposition treatment in a waste water treating field in sequence, and 70 to 90 percent of organic matters in the waste water are decomposed; water discharged from the waste water treating field is treated by a hardness removing device, a filter, a residue hardness removing device, a degassing device and a multi-segmental reverse osmosis membrane set so as to obtain the concentrated water with TDS more than 80,000ppm; and the concentrated water is subjected to evaporation concentration by an evaporation crystallizer and a pressure filter, so that the waste solid with the water content of less than 15 percent is prepared. The method has the advantages of recycling over 99 percent of the waste water for reutilization, reducing environmental pollution, and reducing waste of water resources.

Description

technical field [0001] The invention relates to a method for reducing waste water discharge, in particular to a method for zero discharge of waste water. Background technique [0002] A large amount of industrial wastewater produced by the rapid development of modern industry has caused serious pollution to the environment and destroyed the ecological balance of nature. In order to strengthen the protection of the ecological environment, the industrial wastewater produced by the industry must be recycled to meet the discharge standards. [0003] The traditional industrial wastewater treatment method only uses biochemical treatment. The organic matter in the wastewater is decomposed and settled by microorganisms to form sludge, and some metal ions are also adsorbed by microorganisms in the sludge and buried with the sludge. After biochemical treatment, the quality of wastewater reaches the national first-class standard. It can be discharged after meeting the first-level disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/44C02F1/04
Inventor 吴荣汉
Owner ACTION PERFECT ENG XIAMEN
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