Answer / chirag solanki

Modern wastewater treatment plants at the Cerekiew, Strzelin and Świdnica sugar factories provide savings on water drawn from rivers and ongoing treatment of wastewater without accumulation. Treated wastewater is used for hydraulic flume transport and beet washing in a closed circle system, so it is not necessary to draw water from external sources.

Wastewater treatment includes an aerobic stage based on active sediment.

There are two different periods in the operation of each wastewater treatment plant:

first period: during sugar beet campaigns, when any surplus condensate is treated;
second period: during thick juice campaigns, when industrial wastewater is treated on an ongoing basis and surplus flume water is accumulated in accumulation tanks where it is pre-treated.

In the first period, during sugar beet campaigns, wastewater conveyed to the treatment plant comprises ammonium hydroxide (condensates) and gas pump water. Some flume water, high on carbon-based substances, is also conveyed here to ensure that treated wastewater has an appropriate carbon-to-nitrogen ratio. This is essential in order to achieve the required reduction of biogenic substances. The remaining flume water is conveyed to accumulation ponds where it undergoes self-treatment.

Once it has been processed in an oxygen reactor, wastewater is conveyed (through a degasser) to a secondary settling tank where sediment is separated from wastewater. Sediment is conveyed to the denitrification section of the oxygen reactor, whereas treated wastewater is pumped into the river or re-used at the sugar factory. Any floating parts are removed with a skimmer to the drainage well outside the settling tank and pumped on to the oxygen reactor.

Excessive sediment formed during the wastewater treatment process is removed to sediment ponds.

In the second period, in summer, wastewater accumulated in accumulation ponds is conveyed to the wastewater treatment plant. This type of wastewater has a significantly lower level of pollutants, as expressed in BOD5 and COD, which is the result of self-treatment processes. Additionally, industrial wastewater from current production processes is conveyed to the treatment plant. Wastewater composition makes it possible to treat it in the oxygen reactor directly, without adding any compounds containing carbon or phosphorus. In colder weather, wastewater is heated to 25–30ºC using hot water in a plate heat exchanger. Further treatment follows the method used in the first period.

Explain how is waste heat boilers categorized?

0 Answers  

---

UNIT OPERATION - EXAMPLE 9.2 : A distillation column separates 10000 kg / hr of a mixture containing equal mass of benzene and toluene. The product D recovered from the condenser at the top of the column contains 95 % benzene, and the bottom W from the column contains 96 % toluene. The vapor V entering the condenser from the top of the column is 8000 kg / hr. A portion of the product from the condenser is returned to the column as reflux R, and the rest is withdrawn as the final product D. Assume that V, R, and D are identical in composition since V is condensed completely. Find the ratio of the amount refluxed R to the product withdrawn D. Hint : Solve the simultaneous equations as follow in order to find the answer (R / D) : 10000 = D + W; 10000 (0.5) = D (0.95) + W (0.04); 8000 = R + D.

1 Answers  

---

how to decide reflux ratio & its calculation

1 Answers  

---

Can anyone help me to find out the book where all chemical engineer problem is solved.

3 Answers  

---

what is the difference between car seal close/open valves and lock close/open valves?

0 Answers   MNC,

---

Suppose you have hot fluid and cold water, what fluid you should flow in shell side and tube side in a shell and tube heat exchanger and why

6 Answers  

---

What are the applications of screen analysis in the chemical industry?

0 Answers  

---

Question 60 – During the landing process of an airplane, the velocity is constant at v. (a) If the displacement of the plane is x at time t, find the differential equation that relates t, x and v. (b) The plane has 2 parts of wheels – the front and the back, separated by a distance L. The front part of the wheel touches the land first, that allows the straight body of the plane to form an angle T with the horizontal land. If the vertical distance between the back part of the wheel and the horizontal land is y, find the equation of y as a function of L and T. (c) Find the differential equation that relates dy as a function of dt, v and sin T. (d) Find the differential equation that consist of dy as a function of y, L, v and dt. (e) Find the equation of y as a function of v, L, t and C where C is a constant. (f) When t = 0, prove that y = exp C as the initial value of y.

1 Answers  

---

How can you control the ph level in our cooling water with respect to ammonia contamination?

0 Answers  

---

what is difference between urea and NPK fertiliser?

2 Answers  

---

can u tel me d question paper of gail?

0 Answers   HPCL,

---

when u are walking on the road, somebody got injured by accident. what is ur immediate action.

13 Answers   HPCL,

---