SU802192A1 - Method of treatment of waste water of chemical water-heating units in cycle of thermal electric rower stations - Google Patents

Description

The invention relates to wastewater treatment and can be used in schemes of water treatment plants of thermal power plants. _

Closest to the invention ’in its technical essence and the achieved result is a method for wastewater treatment of chemical water treatment plants in a cycle of thermal power plants, including soda oil labeling, mechanical filtration, Na-cation exchange softening, regeneration and washing of Na-cation exchange filters [Ϊ]. Treated water after softening is sent to 15 evaporation plants. Regenerative discharges of Na-cation exchange filters are directed to evaporators, bringing them to dry salts. The regeneration of Na-cation exchange filters is carried out with 20 clarified water after soda cladding.

The disadvantage of this method is the presence of its own wastewater and the associated evaporation process.

The purpose of the invention is the elimination of wastewater in the cycle of thermal power plants. thirty

The goal is achieved by the described method of wastewater treatment of chemical water treatment plants in a cycle of thermal power plants, including soda lime, mechanical filtration, Na-cation exchange softeners, regeneration and washing of Na-cation exchange filters, while the regeneration of Na-cation exchange filters is carried out with a mixture of sodium chloride solution and softened waste water water, washing with clarified water, and regenerative discharges of Na-cation exchange filters are returned to the soda lime stage.

Distinctive features of the method is that the regeneration of Na-cation exchange filters is carried out with a mixture of sodium chloride solution and softened wastewater, washing with clarified water, and regeneration discharges of Na-cation exchange filters are returned to the soda lime extraction stage ^

The drawing shows the installation for implementing the proposed method.

The installation contains a clarifier 1, an intermediate tank 2, a pump 3, a mechanical filter 4 and Na-cation exchange filters 5 and 6.

The wastewater treatment of chemical water treatment plants in the cycle of thermal power plants is carried out as follows.

Saline wastewater from the main archaeological preparation plant enters clarifier 1, where it is treated with lime and soda at a temperature of 40 ° С, then through an intermediate tank 2 and a transfer pump 3 they are fed to a mechanical filter 4, and then to Na-cation exchange filters 5 and 6. Dump sludge water clarifier 1 and the main water treatment are supplied to the installation 7 regeneration of lime sludge through the apparatus 8 dewatering sludge. The water desalted by the above method is used to feed heating networks, the tegeneration of Macationite filters is carried out by mixtures of sodium chloride and softened water, and the filters are washed with clarified water of the main water treatment.

Regenerative discharges of Na-cation exchange filters are returned to the soda lime stage in a clarifier. Example. Soda clarifier 1 is fed with wastewater of basic water treatment in an amount of 117 m ³ / h, containing, g / m ³ : CaiHSiO ^) ^ 32.0, Ca (НС0 ₃ ) 2 39.0, * CaС2 _g 2190, CaS0 ₄ 5 9 0 / NaCE 670; Na ^ S0 ₄ 2210, salinity 6741, and regenerative discharges of Mac-cationite filters in an amount of 10 m ³ / h, containing, g / m ³ : CaCEC 2100, NaCl 4320, salinity 6420.

Water after clarification has the following characteristics: SaBOd 204 g / m ^3, Ma ^ SOzi 2720 g / cm ^3, NaCi 4150 g / m ^3, hardness of 3.0 meq / kg, alkalinity ^b 25

0.5 mEq / kg, salinity 7074 g / m ³ .

Water after Na-cation exchange filters in the amount of 127 m ³ / h directed to recharge heating networks, having the following indicators: With aS Od 48 g / m ³ , NaCt4150 g / m ³ , Na ₂ S0 ₄ 2884 g / m ³ , hardness 0 05 mEq / kg, alkalinity 1.5 mEq / kg, salinity 7082.

The proposed method allows the full use of saline wastewater from water treatment plants in the cycle of thermal power plants and to reduce the consumption of source water for water treatment.

The proposed economic effect is 300 thousand rubles. in year.

Claims (1)

Claim A method of treating wastewater of chemical water treatment plants in a cycle of thermal power plants, including soda lime, mechanical filtration, Na-cation exchange softening, regeneration and washing of Na-cation filter, characterized in that, in order to eliminate wastewater in the cycle of thermal power plants, the regeneration of Na-cation exchange filters are mixed with sodium chloride solution and softened wastewater, washing with clarified water, and regenerative discharges of Na-cation exchange filters are returned to the soda lime extraction stage. ·